Reconnection device, suspended well completion integrated packer, completion string and reconnection process

Abstract

This disclosure provides a reconnection device, a suspended well completion integrated packer, a completion string, and a reconnection process. The reconnection device includes a locking sleeve unit and an insertion unit. The locking sleeve unit is formed on the suspended well completion integrated packer and includes a reconnection cylinder and a reconnection locking sleeve. The insertion unit is used to insert the locking sleeve unit when a reconnection operation is required. The insertion unit includes a reconnection connecting pipe, a reconnection center pipe, a reconnection spring claw, and a reconnection pressure cap. The reconnection process includes the following steps: inserting the insertion unit into the reconnection cylinder for a trial reconnection; measuring the length of the depth adjustment tubing required at the wellhead during the trial reconnection; the reconnection spring claw and the reconnection locking sleeve engaging to form a lock, completing the reconnection operation; and retracting and pulling out the insertion unit. The suspended well completion integrated packer of this disclosure uses a reconnection device instead of a hydraulic anchor reconnection anchoring device to fix the reconnection connecting pipe, changing from dynamic sealing to static sealing, improving the overall airtightness of the string, and avoiding the inability to lift the string due to the difficulty in retracting the anchor claw of the hydraulic anchor.

Description

Technical Field

[0001] This disclosure relates to the field of manufacturing technology of downhole tools for the oil and gas industry. Specifically, it relates to a reconnection device for a suspended well completion packer, a suspended well completion packer including the reconnection device, a completion string including the suspended well completion packer, and a reconnection process using the suspended well completion packer. Background Technology

[0002] Currently, when implementing staged production enhancement in horizontal wells, production enhancement tools are often run into the horizontal section, and suspended packers are run into the vertical or less inclined sections. After the suspended packer suspends the production enhancement tool string onto the casing, the drill pipe separates from the suspended packer, and then tubing is run back into the tool string and inserted into the back seal of the suspended packer for subsequent fracturing and acidizing operations and later oil and gas production. During fracturing and acidizing operations and oil and gas production, changes in pressure, fluid, and temperature within the tubing can cause expansion and contraction of the tubing string, affecting the seal between the back-connection and the back seal, and in severe cases, even damaging downhole tools and tubing. To avoid these problems, hydraulic anchors are typically used on-site to secure the tubing and prevent expansion and contraction.

[0003] Chinese patent application CN201276996Y, published on July 22, 2009, discloses a hydraulic anchor, including an anchor body, an anchor claw, and a retaining sleeve. The anchor body has an anchor claw hole, and the anchor claw hole has a variable diameter shoulder. The anchor claw is inserted into the anchor claw hole from the anchor body. The anchor body has a retaining sleeve, and the anchor claw can only move within a certain range and will not fall off. It is reliable in use and can prevent the anchor claw from falling off and jamming the tubing string, thus avoiding engineering accidents in oil wells. However, the hydraulic anchor of this patent is anchored by the anchor claw, which is extended from the anchor string by the pressure difference between the two ends of the anchor claw. Since there is a sealing requirement between the anchor claw and the body, the anchor claw is cylindrical and the installation gap between the anchor claw and the body is very small. After long-term use in the well, the hydraulic anchor may become difficult to retract due to corrosion, scaling, sand settling, etc., which may cause the anchor claw to jam the string and prevent the string from being lifted. On the other hand, since the anchor claw and the body are dynamically sealed, the gas seal of the string is prone to failure, which may prevent the completion of the well and gas production, and may even lead to engineering accidents in the oil and gas well.

[0004] Chinese patent application CN109667555A, published on April 23, 2019, discloses a full-bore low-setting-pressure suspension packer, a reconnector, and an installation process. The reconnector includes a plug body, a guide shoe connected to one end for guiding the reconnector into the suspension packer, and a clamp connected to the other end. A sealing assembly is provided between the clamp and the plug body. A pawl with threads is provided on the outer periphery of the plug body for reconnecting the reconnector from the suspension packer. At least one sealing ring is fitted on the end of the plug body near the guide shoe, and a fixing ring is provided between adjacent sealing rings to space them apart. This patent's reconnector uses a pawl with threads to prevent the reconnector from retracting from the suspension packer after reconnection. However, the locking between the reconnector and the reconnector sleeve is unstable, easily leading to reconnection failure. Furthermore, it lacks suitable components to accommodate situations where the reconnector sleeve needs to be removed. Summary of the Invention

[0005] The purpose of this disclosure is to address at least one of the aforementioned deficiencies in the prior art. For example, one objective of this disclosure is to provide a reconnection device for a suspended well completion integrated packer that can replace the hydraulic anchor reconnection anchoring device for fixing the reconnection connection pipe, changing from dynamic sealing to static sealing, thereby improving the overall airtightness of the tubing string. Another objective of this disclosure is to provide a reconnection device for a suspended well completion integrated packer that allows the reconnection center pipe to not rotate with the tubing string when the reconnection device is retrieved, greatly reducing tubing string friction and facilitating tubing string retrieval.

[0006] To achieve the above objectives, one aspect of this disclosure provides a reconnection device for a suspended well completion packer, comprising a locking sleeve unit and an insertion tube unit. The locking sleeve unit, formed on the suspended well completion packer, includes a reconnection cylinder and a reconnection locking sleeve, the second end of the reconnection locking sleeve being connected to the first end of the reconnection cylinder, and the inner wall being provided with a positive locking structure. The insertion unit, used for insertion into the reconnection sleeve during reconnection operations and locking with the reconnection locking sleeve, includes: a reconnection connecting pipe, the first end of which is used to connect to the oil pipe; a reconnection center pipe, the first end of which is coaxially sealed with the second end of the reconnection connecting pipe, and a sealing component is provided on the outer wall of the second end of the reconnection center pipe to form an axial seal with the inner wall of the reconnection sleeve; a reconnection spring claw, which is sleeved on the outer wall of the reconnection connecting pipe, and the outer wall of the reconnection spring claw has a reverse locking structure that can cooperate with the forward locking structure to form a lock; and a reconnection pressure cap, which is sleeved and connected to the outer wall of the reconnection connecting pipe, and the second end of the reconnection pressure cap abuts against the first end of the reconnection spring claw.

[0007] In an exemplary embodiment of this disclosure, the inner wall of the second end of the reconnection tube may be sequentially formed with a first annular step and a second annular step, the first end of the reconnection center tube is coaxially sealed with the reconnection tube at the first annular step, and the second annular step of the reconnection tube and the reconnection center tube form a first annular cavity with a one-way opening.

[0008] In an exemplary embodiment of this disclosure, the reconnection device may further include: a support cap, the first end of which is inserted into a first annular cavity, and the outer sidewall of the first end of the support cap is coaxially connected to a second annular step of the reconnection connecting pipe, the second end of the support cap protruding radially outward to block the opening of the first annular cavity and support it on the bottom surface of the reconnection connecting pipe and the reconnection spring claw, and a second annular cavity is formed between the inner sidewall of the first end of the support cap and the reconnection center pipe; and a retaining ring, which is composed of two semicircles and disposed in the second annular cavity, and the retaining ring is coaxially engaged with the center pipe and the support cap.

[0009] In an exemplary embodiment of this disclosure, the outer wall of the second end of the reconnection pipe may be uniformly provided with a plurality of axial shoulders, and the second end of the reconnection spring claw may be uniformly provided with a plurality of segmented spring claws. The axial shoulders and the segmented spring claws are cross-engaged to restrict the reconnection spring claw from rotating circumferentially.

[0010] In one exemplary embodiment of this disclosure, the reconnection device may further include: a protective component configured to prevent the reconnection sleeve and the reconnection pawl from locking together when locking is not desired. The protective component may include: a protective sleeve fitted over the outer wall of the reconnection connecting tube and extending toward the second end of the reconnection connecting tube, the protective sleeve covering the reverse locking structure and forming a third annular cavity with an opening toward the second end of the reconnection connecting tube; and a reconnection shearing fastener fixing the protective sleeve relative to the reconnection connecting tube and capable of being sheared under a seventh axial shear force.

[0011] In an exemplary embodiment of this disclosure, the outer wall of the reconnection pipe is formed with a fourth annular step, a fifth annular step, and a third annular step from top to bottom. The outer diameter of the fourth annular step is less than the outer diameter of the fifth annular step and the outer diameter of the third annular step. The reconnection spring claw is disposed at the third annular step, and the inner wall of the first end of the reconnection spring claw is provided with an annular flange. The third annular step and the annular flange can restrict the axial sliding of the reconnection spring claw. The protective sleeve is fixed to the fourth annular step by a reconnection shearing fastener. The reconnection pressure cap is connected to the fifth annular step by a thread.

[0012] Another aspect of this disclosure provides a suspended well completion packer, which includes the reconnection device as described above.

[0013] In one exemplary embodiment of this disclosure, the suspended well completion packer may further include at least one of a setting mechanism, a release mechanism, a setting and unsealing mechanism.

[0014] In an exemplary embodiment of this disclosure, the setting mechanism may include: a setting center tube, a first end of which is used to connect to a drill pipe, and a first through hole is formed on the tube wall near the first end of the setting center tube; a setting assembly configured to seal the inner cavity of the setting center tube at a setting position near the second end of the setting center tube; a first setting cylinder sleeve fitted on the outer wall of the setting center tube, and a first liquid inlet chamber with a one-way opening is formed between the first setting cylinder sleeve and the setting center tube, the first liquid inlet chamber communicating with the first through hole; and a first annular setting piston, the first annular setting piston disposed in the first liquid inlet chamber and sealing the opening of the first liquid inlet chamber, a portion of the first annular setting piston extending radially outward to be engaged between the second end of the first setting cylinder sleeve and the return cylinder; wherein, the first end of the return cylinder abuts against the first annular setting piston.

[0015] In an exemplary embodiment of this disclosure, the seat-hanging mechanism may include: a seat-hanging center tube, the first end of which is connected to the second end of a seat-sealing center tube via a release mechanism; a thrust sleeve, which is fitted onto the outer wall of the seat-hanging center tube, with the first end of the thrust sleeve abutting against the second end of a return sleeve; an actuation shearing fixing member, which fixes the thrust sleeve relative to the seat-hanging center tube and is capable of being sheared under the action of a second axial shearing force; and a seat-hanging sealing assembly, which is connected to the second end of the thrust sleeve and is capable of moving to the seat-hanging position under the thrust of the thrust sleeve, so that the seat-hanging sealing assembly is fixed on the inner wall of the sleeve and forms a seal between the seat-hanging sealing assembly and the inner wall of the sleeve.

[0016] In an exemplary embodiment of this disclosure, the dropping mechanism may include: a dropping spring lock tube, the inner wall of the first end of the dropping spring lock tube being axially sealed with the inner wall of the return tube, and the second end of the dropping spring lock tube being provided with evenly distributed spring claws; a dropping lock head, formed on the inner wall of the dropping spring lock tube, the first end of the dropping lock head being axially sealed with the dropping spring lock tube; a dropping shearing and fixing member, which fixes the dropping lock head and the dropping spring lock tube relative to each other and is capable of being sheared under the action of a fourth axial shearing force; a central coupling, the outer wall of the central coupling forming an axial seal with the inner wall of the second end of the return tube, the first end of the central coupling being coaxially connected with the dropping spring lock tube, and the second end of the central coupling abutting against the seat center tube; and a dropping assembly, configured to block the inner cavity of the dropping lock head near the inner wall of the first end of the dropping lock head.

[0017] In an exemplary embodiment of this disclosure, the release assembly may include: a release limiting portion formed on the inner wall of the release lock head; and a release sealing member placed in the inner cavity of the release lock head and abutting against the release limiting portion, wherein the release sealing member is restricted by the release limiting portion to move toward the second end of the release lock head, and the inner wall of the release lock head cooperates with the release limiting portion to seal the inner cavity of the release lock head.

[0018] In an exemplary embodiment of this disclosure, the first end of the unsealing mechanism is connected to the mounting mechanism to unseal the packer. The unsealing mechanism may include: an unsealing sleeve, the first end of which abuts against the second end of the mounting center tube; an unsealing claw, sleeved on the outer wall of the unsealing sleeve, the first end of which is axially sealed to the second end of the mounting center tube, and the second end of which is provided with a plurality of evenly distributed claws; an unsealing shearing and fixing member, which fixes the unsealing sleeve and the unsealing claw relative to each other and can be sheared under the action of a seventh axial shear force; and an unsealing assembly, which is configured to seal the inner cavity of the unsealing sleeve near the unsealing sleeve.

[0019] Another aspect of this disclosure provides a completion string that includes the suspended integrated completion packer as described above.

[0020] Another aspect of this disclosure provides a reconnection process using the reconnection device described above. The reconnection process includes the following steps: S1, lowering the tubing with a suspension weight to insert the insertion unit into the reconnection cylinder for a trial reconnection; S2, measuring the length of the depth-adjusting tubing required at the wellhead for the trial reconnection, and connecting the depth-adjusting tubing of the specified length at the wellhead; S3, lowering the insertion unit to engage the reconnection spring claw with the reconnection locking sleeve to form a lock, thus completing the reconnection operation; S4, rotating the tubing string to release the locking structure of the reconnection spring claw from the locking structure of the reconnection locking sleeve, and retrieving the insertion unit.

[0021] Compared with the prior art, the beneficial effects of this disclosure may include at least one of the following:

[0022] 1) The return locking sleeve is used to fix the return connection pipe instead of the hydraulic anchor return anchoring device, changing from dynamic sealing to static sealing, improving the overall airtightness of the pipe string, and also avoiding the pipe string being unable to be lifted due to the difficulty in retracting the anchor claws of the hydraulic anchor.

[0023] 2) The anti-rotation component ensures that the reconnection center tube does not rotate with the pipe column when the reconnection device is pulled out, which greatly reduces pipe column friction and facilitates the removal of the pipe column.

[0024] 3) The protective components are designed to prevent the retraction lock sleeve and the retraction spring claw from locking together when it is not desired;

[0025] 4) The setting mechanism is located above the suspended packer and is independent. It can be set independently in the open hole section tubing string of a horizontal well, so that the function of other tools in the open hole section completion tubing string is not affected. The setting pressure will not act on the differential pressure sleeve, thus avoiding the premature opening of the differential pressure sleeve.

[0026] 5) First, only set the suspended packer. If the settling of the suspended packer is abnormal, the tubing can be raised to facilitate handling of abnormal situations.

[0027] 6) Depending on the process requirements, the ball can also be thrown into the setting ball seat at the bottom of the pipe string to set the suspended packer and the open hole packer in a coordinated manner, which improves the flexibility of the construction process.

[0028] 7) Without changing the release principle of hydraulic and mechanical reverse coupling, the pressure regulating valve is eliminated and a release force-adding device is added. This can realize multiple release methods and improve the compressive strength of the tubing string, so that it can operate in deep wells with a high proportion of kill fluid without restriction.

[0029] 8) If the tubing gets stuck during insertion, the tubing can be lifted to release the blockage. Attached Figure Description

[0030] Figure 1 A schematic diagram of the structure of the locking sleeve unit in the reconnection device of the suspended well completion integrated packer of the present disclosure is shown;

[0031] Figure 2 A schematic diagram of the tube insertion unit in the reconnection device of the suspended well completion integrated packer of the present disclosure is shown;

[0032] Figure 3 It shows Figure 2 An enlarged schematic diagram of part A in the diagram;

[0033] Figure 4 It shows Figure 2 An enlarged schematic diagram of part B in the diagram;

[0034] Figure 5 It shows along Figure 2 The sectional view taken by line II in the middle;

[0035] Figure 6 A schematic diagram of the reconnection device for the suspended well completion packer of an exemplary embodiment of the present disclosure is shown after the reconnection operation is completed;

[0036] Figure 7 A schematic diagram of the setting mechanism of a suspended well completion integrated packer according to an exemplary embodiment of the present disclosure is shown;

[0037] Figure 8 It shows Figure 7 An enlarged schematic diagram of part C in the diagram;

[0038] Figure 9 A schematic diagram of the mounting mechanism of the suspended well completion packer, an exemplary embodiment of the present disclosure, is shown.

[0039] Figure 10 A schematic diagram of the release mechanism of a suspended well completion integrated packer according to an exemplary embodiment of the present disclosure is shown;

[0040] Figure 11 It shows Figure 10 An enlarged schematic diagram of part D in the diagram;

[0041] Figure 12 A schematic diagram of the unsealing mechanism of a suspended well completion packer according to an exemplary embodiment of the present disclosure is shown;

[0042] Figure 13 A schematic diagram of a completion string according to an exemplary embodiment of the present disclosure is shown;

[0043] Figure 14 A flowchart of the reconnection process for the reconnection device of the suspended well completion integrated packer disclosed herein is shown.

[0044] The markings in the image are as follows:

[0045] 51-Locking sleeve unit, 511-Return sleeve, 512-Return locking sleeve, 52-Insertion tube unit, 521-Return connecting tube, 521a-First annular step, 521b-Second annular step, 521c-Third annular step, 521d-Fourth annular step, 521e-Fifth annular step, 521f-Axial shoulder, 522-Return center tube, 523-Return spring claw, 523a-Split spring claw, 524-Return pressure cap, 525-Anti-rotation component, 525a-Bearing cap, 525b-Clamping ring, 526-Protective component, 526a-Protective sleeve, 52 6b-Return shearing fixing component, 1-Setting mechanism, 11-Setting center tube, 12-First setting cylinder liner, 13-First annular setting piston, 14-Setting assembly, 141-Setting ball seat, 142-Setting ball, 143-Spare setting shearing fixing component, 15-Upper connector, 16-Setting intermediate connector, 161-Inclined surface, 17-Second setting cylinder liner, 18-Second annular setting piston, a-First through hole, b-Second through hole, 19-Straightening sleeve, 2-Setting mechanism, 21-Setting center tube, 22-Thrust sleeve, 23-Starting shearing fixing component, 24-Setting seal Components, 241-Glue Sleeve, 242-Glue Sleeve Seat, 243-Upper Cone, 244-Holding Shearing Fixing Component, 245-Latch Support, 246-Latch, 246b-First Set of Latch Plates, 246a-Second Set of Latch Plates, 247-Lower Cone, 248-Cone Pressure Cap, 249-Key, 25-Locking Assembly, 251-Locking Sleeve, 252-Locking Ring, 3-Discarding Mechanism, 31-Discarding Pressure Cap, 32-Discarding Spring Lock Tube, 33-Discarding Lock Head, 34-Discarding Shearing Fixing Component, 35-Discarding Assembly, 351-Discarding Ball, 352-Second Diameter Reduction Section, 36-Discarding Force-adding assembly, 361-release force-adding sleeve, 361a-release force-adding variable diameter section, 362-release force-adding push rod, 363-release force-adding shearing fixing component, 37-sealing assembly, 38-center coupling, 4-unsealing mechanism, 41-unsealing sleeve, 42-unsealing claw, 43-unsealing shearing fixing component, 44-unsealing assembly, 441-unsealing ball, 442-third variable diameter section, 101-throwing ball sliding sleeve, 102-open eye packer, 103-differential pressure sliding sleeve, 104-tail setting assembly, 105-guide shoe + screen tube, 106-oil pipe, 107-casing, E-suspended packer. Detailed Implementation

[0046] In the following text, the suspended well completion integrated packer of this disclosure will be described in detail with reference to exemplary embodiments. In this document, terms such as "first," "second," "third," and "fourth" are merely for ease of description and distinction, and should not be construed as indicating or implying relative importance or a strict order. Terms such as "upper," "lower," "inner," and "outer" are merely for ease of description and to establish relative orientation or positional relationships, and do not indicate or imply that the referred component must have that specific orientation or position. In this application, the "first end" of each component may be the "upper end" shown in the figures, and the "second end" may be the "lower end" shown in the figures. The "upper end" and "lower end" are consistent with the upper and lower directions of the figures themselves, but do not limit the structure of the components of this disclosure. For example, after the orientation of the components shown in the figures changes, the "first end" may also be the "left end" shown in the figures, and the "second end" may be the "right end" shown in the figures, etc.

[0047] Furthermore, the methods for shaft sealing and connection can employ those commonly used in the art (e.g., shaft sealing can be achieved through sealing rings or sealing assemblies, such as sealing assemblies which may include several O-rings and several O-ring back rings, and connections can be made using threaded connections, snap-fit ​​connections, or plug connections), which will not be elaborated upon further in this disclosure. "Abutting" can be understood as two parts being close to or pressed against each other and capable of preventing relative movement between the two parts.

[0048] In a first exemplary embodiment of this disclosure, a reconnection device for an integrated packer for suspended well completion provided by this disclosure includes a locking sleeve unit and a tube insertion unit.

[0049] The locking sleeve unit is formed on the suspended well completion packer and includes a return sleeve and a return locking sleeve. The return sleeve is part of the suspended well completion packer. After the suspended well completion packer completes setting and release, the insertion unit is inserted into the return sleeve to cooperate and complete the return. The second end (also called the lower end) of the return locking sleeve and the first end (also called the upper end) of the return sleeve can be coaxially connected by threads, and the inner wall is provided with a positive locking structure.

[0050] The insertion unit is used to insert into the reconnection tube when reconnection is required and cooperates with the reconnection locking sleeve to form a lock. The insertion unit includes a reconnection connecting tube, a reconnection center tube, a reconnection spring claw, and a reconnection pressure cap.

[0051] The first end of the reconnecting pipe is used to connect to the oil pipe. A coupling may also be provided at the first end of the reconnecting pipe to connect it to the oil pipe.

[0052] The first end of the reconnecting center tube can be axially sealed with the second end of the reconnecting connecting tube. Furthermore, the outer wall of the lower end of the reconnecting center tube is equipped with sealing components such as V-shaped sealing rings and sealing rings to form an axial seal with the inner wall of the reconnecting cylinder. The second end of the reconnecting center tube may also be equipped with a guide shoe, which has a chamfer to guide the insertion unit into the locking sleeve unit.

[0053] The retraction pawl is fitted onto the outer wall of the retraction connecting pipe. The outer wall of the retraction pawl has a reverse locking structure that engages with the forward locking structure for locking. It should be noted that the reverse locking structure of the retraction pawl is opposite to the forward locking structure of the retraction locking sleeve. The reverse and forward locking structures can also be mutually engaging threaded structures, as long as they can cooperate to form a lock. For example, the forward locking structure of the retraction locking sleeve may be a trapezoidal sawtooth left-hand internal thread, while the reverse locking structure of the retraction pawl may be a trapezoidal sawtooth left-hand external thread.

[0054] The retraction cap is fitted onto the outer wall of the retraction connecting pipe and can be threaded to the retraction connecting pipe. The second end of the retraction cap abuts against the first end of the retraction spring claw. The outer diameter of the second end of the retraction cap can be larger than the inner diameter of the first end of the retraction spring claw, thereby restricting the movement of the retraction spring claw toward the first end of the retraction connecting pipe.

[0055] During the reconnection operation, the tubing is lowered and suspended under weight. The insertion unit is then inserted, causing the reverse locking structure of the reconnection spring claw and the forward locking structure of the reconnection sleeve to engage and lock together, thus completing the reconnection operation. When it is necessary to remove the insertion unit, the tubing string can be rotated to release the forward locking structure of the reconnection sleeve and the reverse locking structure of the reconnection spring claw (hereinafter referred to as reversing, which means releasing the forward locking structure of the reconnection sleeve and the reverse locking structure of the reconnection spring claw), allowing the insertion unit to be removed.

[0056] In this embodiment, the reconnection operation is changed from the dynamic seal of the hydraulic anchor to a static seal achieved by a sealing ring or sealing assembly, which can improve the overall gas tightness of the tubing string and realize well completion and gas production; it can also avoid the tubing string being unable to be lifted because the anchor claws of the hydraulic anchor are not easy to retract.

[0057] Figure 1 A schematic diagram of the structure of the locking sleeve unit in the reconnection device of the suspended well completion integrated packer of the present disclosure is shown; Figure 2 A schematic diagram of the tube insertion unit in the reconnection device of the suspended well completion integrated packer of the present disclosure is shown; Figure 3 It shows Figure 2 An enlarged schematic diagram of part A in the diagram; Figure 4 It shows Figure 2 An enlarged schematic diagram of part B in the diagram; Figure 5 It shows along Figure 2The sectional view taken by line II in the middle; Figure 6 A schematic diagram of the reconnection device for the suspended well completion packer of the exemplary embodiment of this disclosure is shown after the reconnection operation is completed.

[0058] In the second exemplary embodiment of this disclosure, as Figure 1 and Figure 2 As shown, the reconnection device for the integrated packer for well completion consists of two layers: an outer layer that may include a locking sleeve unit 51 and an inner layer that may include a tube insertion unit 52.

[0059] like Figure 1 As shown, the locking sleeve unit 51 is formed on the suspended well completion integrated packer, including a return sleeve 511 and a return locking sleeve 512. The lower end of the return locking sleeve 512 is connected to the upper end of the return sleeve 511 (as shown in the image). Figure 1 The end closer to arrow α is connected, and the inner wall is provided with a positive locking structure. The return sleeve 511 is fixed at a predetermined position downhole along with the suspended well completion integrated packer.

[0060] like Figure 2 As shown, the insertion unit 52 is used to insert into the reconnection tube 511 during reconnection operations and cooperates with the reconnection locking sleeve 512 to form a lock. The insertion unit 52 may include a reconnection connecting tube 521, a reconnection center tube 522, a reconnection spring claw 523, and a reconnection pressure cap 524.

[0061] Reconnect the upper end of the connecting pipe 521 (e.g.) Figure 2 The end closer to arrow α is used for connection to the oil pipe. For example, the reconnection pipe 521 may have a coupling at its upper end, through which the reconnection pipe 521 is connected to the oil pipe.

[0062] The upper end of the reconnection center tube 522 can be connected to the lower end of the reconnection connecting tube 521 (e.g., Figure 2 The end closer to arrow β is sealed. Furthermore, the outer wall of the lower end of the reconnection center tube 522 is provided with sealing components such as V-shaped sealing rings and sealing rings to form a shaft seal with the inner wall of the reconnection cylinder 511. A guide shoe may also be provided at the lower end of the reconnection center tube 522, with a chamfered edge to guide the insertion unit 52 into the reconnection locking sleeve 512.

[0063] The return spring pawl 523 is sleeved on the outer wall of the return connecting pipe 521. The outer wall of the return spring pawl 523 has a reverse locking structure, which can cooperate with the forward locking structure of the return locking sleeve 512 for locking. For example, the reverse locking structure can be a trapezoidal sawtooth left-hand external thread structure. It should be noted that the reverse locking structure of the return spring pawl 523 is opposite to the forward locking structure of the return locking sleeve 512. The reverse locking structure and the forward locking structure can be mutually cooperating threaded structures, as long as they can cooperate to form a lock.

[0064] The reconnection cap 524 is sleeved and connected to the outer wall of the reconnection connecting pipe 521, and can be threaded to the reconnection connecting pipe 521. The lower end of the reconnection cap 524 abuts against the upper end of the reconnection spring claw 523. The outer diameter of the lower end of the reconnection cap 524 can be larger than the inner diameter of the reconnection spring claw 523, thereby restricting the movement of the reconnection spring claw 523 towards the upper end of the reconnection connecting pipe 521.

[0065] During the reconnection operation, the tubing is lowered for suspension, and the insertion unit 52 is inserted into the reconnection sleeve 511. The reverse locking structure of the reconnection claw 523 and the forward locking structure of the reconnection locking sleeve 512 cooperate to form a lock, thus completing the reconnection operation. When it is necessary to remove the insertion unit 52, the tubing string can be rotated and reversed to remove the insertion unit 52. Only the upper part of the tubing string of the reconnection center tube 522 rotates, and the reconnection center tube 522 can be removed along with the upper tubing string.

[0066] In this embodiment, as Figure 2 and Figure 4 As shown, the inner wall of the lower end of the reconnection pipe 521 can be sequentially formed with a first annular step 521a and a second annular step 521b from top to bottom. That is, the inner diameter of the upper part of the reconnection pipe 521 is less than the inner diameter of the reconnection pipe 521 at the first annular step 521a and less than the inner diameter of the reconnection pipe 521 at the second annular step 521b. The upper end of the reconnection center pipe 522 is coaxially sealed with the first annular step 521a of the reconnection pipe 521, and the second annular step 521b of the reconnection pipe 521 forms a first annular cavity with a one-way opening with the reconnection center pipe 522.

[0067] In this embodiment, the reconnection device may further include an anti-rotation component 525. The anti-rotation component 525 is configured to prevent rotation only in the upper direction of the reconnection center tube 522 when it is reversed. Figure 2 and Figure 4 As shown, the anti-rotation component 525 may include a support cap 525a and a retainer 525b.

[0068] The upper part of the bearing cap 525a is inserted into the first annular cavity, and the outer wall of the upper part of the bearing cap 525a is coaxially connected to the second annular step 521b of the return connection tube 521 via threads. The lower part of the bearing cap 525a protrudes radially outward to block the opening of the first annular cavity and is supported on the bottom surface of the return connection tube 521 and the return spring claw 523. The inner wall of the upper part of the bearing cap 525a forms a second annular cavity between itself and the return center tube 522.

[0069] The retaining ring 525b consists of two semicircles and is disposed within the second annular cavity. The retaining ring 525b is coaxially fitted with the return center tube 522 and the support cap 525a. Here, the retaining ring 525b is configured as two semicircles to allow the return center tube 522 to be retracted without requiring rotation. Additionally, the outer diameter of the support cap 525a can be larger than the inner diameter of the return spring claw 523, preventing the return spring claw 523 from axially sliding out of the outer wall of the return connecting tube 521. The retaining ring 525b is held in place by the support cap 525a within the second annular cavity, and the support cap 525a also restricts the axial movement of both the return spring claw 523 and the retaining ring 525b.

[0070] With the anti-rotation component 525 in place, if it is necessary to remove the insertion tube unit 52 after reconnection, when reversed, simply rotate the upper end of the reconnection center tube 522 (e.g., Figure 2 For the pipe column closer to the direction of arrow β, the reconnection center pipe 522 does not need to rotate. This prevents the reconnection center pipe 522 from needing to rotate during the reverse threading process, which would increase pipe column friction and make it difficult to remove the pipe column. In other words, according to the embodiments of this disclosure, if the reconnection pipe needs to be removed, when reconnecting by rotating forward or backward, only the upper part of the pipe column of the reconnection center pipe 522 rotates, and the reconnection center pipe 522 will be removed along with the pipe column.

[0071] In this embodiment, as Figure 2 and Figure 5 As shown, the lower end of the reconnection pipe 521 (such as...) Figure 2 The outer wall of the middle section (closer to arrow β) can be uniformly provided with several axial shoulders 521f along the circumference, for example... Figure 5 The return connection pipe 521 is provided with eight axial shoulders 521f, and the lower end of the return spring claw 523 can be evenly provided with several segmented spring claws 523a, for example... Figure 5 The return spring pawl 523 is provided with eight segmented spring pawls 523a. The axial shoulder 521f intersects with the segmented spring pawls 523a, that is, the segmented spring pawls 523a are placed between adjacent axial shoulders 521f to restrict the return spring pawl 523 from rotating circumferentially. However, this disclosure is not limited to this, and the number of axial shoulders 521f and segmented spring pawls 523a can be selected according to actual needs.

[0072] During reconnection, the axial shoulder 521f can rotate together with the reconnection connecting pipe 521 and drive the split spring claw 523a to rotate, so that the reverse locking structure of the reconnection spring claw 523 and the forward locking structure of the reconnection locking sleeve 512 can cooperate more efficiently to form a lock.

[0073] In addition, after the reconnection is completed, if it is necessary to remove the insertion tube unit 52, and the reconnection tube column is flipped and removed, the axial shoulder 521f can rotate together with the reconnection connecting tube 521 and drive the split spring claw 523a to rotate, thereby releasing the lock between the reconnection spring claw 523 and the reconnection locking sleeve 512.

[0074] In a third exemplary embodiment of this disclosure, based on any of the foregoing exemplary embodiments, such as Figure 2 and Figure 3 As shown, the cannulation unit 52 may also include a protection component 526. The protection component 526 is configured to prevent the reconnection sleeve 512 and the reconnection pawl 523 from locking together when it is not desired. For example, the protection component 526 may be configured to cover the reverse locking structure of the reconnection pawl 523 to prevent the reconnection sleeve 512 and the reconnection pawl 523 from engaging and locking together during a reconnection attempt.

[0075] In this embodiment, as Figure 2 and Figure 3 As shown, the protective component 526 may include a protective sleeve 526a and a retraction shear fastener 526b.

[0076] The protective sleeve 526a is fitted on the outer wall of the reconnection pipe 521 and extends to the lower end of the reconnection pipe 521. The protective sleeve 526a can cover the reverse locking structure and form a third annular cavity with the reconnection pipe 521, with the opening facing the lower end of the reconnection pipe 521. The reconnection cap 524 and the reconnection spring claw 523 can be formed in the third annular cavity. The lower end face of the protective sleeve 526a can contact the upper end face of the reconnection cap 524. The inner diameter of the lower end of the protective sleeve 526a should be the same as or similar to the inner diameter of the upper end of the reconnecting lock sleeve 512, so that the end face of the lower end of the protective sleeve 526a can abut against the end face of the upper end of the reconnecting lock sleeve 512. In other words, the relationship between the inner diameter of the lower end of the protective sleeve 526a and the inner diameter of the upper end of the reconnecting lock sleeve 512 should be such that the end face of the lower end of the protective sleeve 526a and the end face of the upper end of the reconnecting lock sleeve 512 can overlap at least partially, so that the end face of the lower end of the reconnecting lock sleeve 512 can be supported on the end face of the lower end of the protective sleeve 526a and prevent the protective sleeve 526a from moving downward.

[0077] The reconnection shearing fastener 526b fixes the protective sleeve 526a relative to the reconnection connecting pipe 521 and can be sheared under the action of a first axial shear force. The reconnection shearing fastener 526b may include a number of shear pins or shear studs; however, this disclosure is not limited to this, and any fastener that can be sheared under the action of external force is acceptable.

[0078] Since the top of the tubing string needs to be exactly at the wellhead after the reconnection operation, a measuring tubing is connected to the upper end of the wellhead before the reconnection operation is completed. A certain amount of tubing weight needs to be lowered to insert the insertion unit 52 into the reconnection sleeve 511 for a trial reconnection, in order to measure the length of the measuring tubing entering the wellhead (i.e., the required depth adjustment tubing length). During the trial reconnection, by setting the protective component 526, the lower end face of the protective sleeve 526a is blocked by the upper end face of the reconnection locking sleeve 512. The tubing weight lowered during the trial reconnection is insufficient to generate the first axial shear force to cut the reconnection shearing fixing component 526b. The protective sleeve 526a covers the reverse locking structure of the reconnection spring claw 523, preventing it from engaging with the forward locking structure of the reconnection locking sleeve 512 to form a lock during the trial reconnection. Additionally, this confirms that the trial reconnection position is feasible, and the length of the measuring tubing entering the wellhead can be measured, thus completing the trial reconnection.

[0079] like Figure 2 and Figure 3 As shown, the outer wall of the reconnection pipe 521 may be formed with a third annular step 521c, and the reconnection spring claw 523 is disposed on the third annular step 521c. The inner wall of the upper end of the reconnection spring claw 523 may also be provided with an annular flange, so as to cooperate with the third annular step 521c to restrict the reconnection spring claw 523 from sliding downward along the axial direction, and prevent the reconnection spring claw 523 from sliding out of the outer wall of the reconnection pipe 521.

[0080] like Figure 2 and Figure 3 As shown, the outer wall above the third annular step 521c of the return connection pipe 521 may also be sequentially formed with a fourth annular step 521d and a fifth annular step 521e. The outer diameter of the fourth annular step 521d < the outer diameter of the fifth annular step 521e < the outer diameter of the third annular step 521c, thus, the outer diameters of the fourth annular step 521d, the fifth annular step 521e, and the third annular step 521c form a three-level stepped surface from top to bottom.

[0081] Among them, the protective sleeve 526a can be fixed to the fourth annular step 521d by the back-connecting shear fastener 526b, and the back-connecting pressure cap 524 can be connected to the fifth annular step 521e by the thread. The protective sleeve 526a, the back-connecting pressure cap 524 and the back-connecting spring claw 523 abut against each other in sequence, and the upper end face of the back-connecting pressure cap 524 can contact and cooperate with the inner end face of the protective sleeve 526a.

[0082] The aforementioned three-stage stepped surface structure facilitates the axial positioning and installation of the protective sleeve 526a, the reconnection cap 524, and the reconnection spring claw 523 on the outer wall of the reconnection connecting pipe 521, and restricts the axial sliding of the reconnection spring claw 523, preventing the reconnection spring claw 523 from axially disengaging from the outer wall of the reconnection connecting pipe 521.

[0083] like Figure 6 As shown, when performing a reconnection operation using the reconnection device of this embodiment, the insertion unit 52 is inserted into the reconnection cylinder 511. The lower end of the protective sleeve 526a is blocked by the end face of the upper end of the reconnection locking sleeve 512 and the reconnection shearing fixing member 526b is cut off when subjected to the first axial shearing force. The protective sleeve 526a is held in place by the reconnection locking sleeve 512. By continuing to lower the oil pipe suspension weight, the protective sleeve 526a can be moved upward, thereby exposing the reverse locking structure of the reconnection spring claw 523, which cooperates with the forward locking structure of the reconnection locking sleeve 512 to form a lock, thus realizing the reconnection operation.

[0084] In a fourth exemplary embodiment of this disclosure, a suspended well completion packer is also provided, the suspended well completion packer including the reconnection device as described above.

[0085] The suspended well completion packer (hereinafter referred to as the suspended packer) may also include at least one of the following: a setting mechanism, a release mechanism, a setting and hanging mechanism, and an unsealing mechanism.

[0086] Figure 7 A schematic diagram of the setting mechanism of a suspended well completion integrated packer according to an exemplary embodiment of the present disclosure is shown; Figure 8 It shows Figure 7 An enlarged schematic diagram of part C in the diagram; Figure 9 A schematic diagram of the mounting mechanism of a suspended well completion packer according to an exemplary embodiment of the present disclosure is shown.

[0087] Among them, such as Figure 7 As shown, the setting mechanism 1 may include a setting center tube 11, a setting assembly 14, a first setting cylinder liner 12, and a first annular setting piston 13. The upper end of the setting center tube 11 (e.g., Figure 7 The end closer to arrow α) is used for connection with the drill pipe (not shown). A first through hole a is formed in the wall of the setting center tube 11 near the upper end. The number of first through holes a can be determined according to the actual situation, such as 1, 3, 5 or 8, etc. The setting assembly 14 is configured to be able to connect to the drill pipe (not shown) near the lower end of the setting center tube 11. Figure 7 The inner cavity of the setting center tube 11 is blocked at the setting position (closer to the end of arrow β).

[0088] The setting assembly 14 may include a setting limiting part and a setting sealing member. The setting limiting part is formed at the setting position. The setting sealing member can be inserted into the inner cavity of the setting center tube 11 from the upper end of the setting center tube 11, and abuts against the setting limiting part at the setting position to restrict the setting sealing member from moving further to the lower end of the setting center tube 11. The setting sealing member cooperates with the setting limiting part at the setting position to seal the inner cavity of the setting center tube 11. The setting sealing member can be a sphere, a quasi-sphere, a hemisphere, a semi-hemisphere, etc., as long as the setting sealing member and the setting limiting part cooperate to form a seal at the setting position.

[0089] In this embodiment, as Figure 8 As shown, the setting assembly 14 may include a setting ball seat 141 and a setting ball 142. In this embodiment, the setting ball seat 141 serves as a setting limiting part, and the setting ball 142 serves as a setting sealing member. The setting ball seat 141 is circumferentially disposed near the lower end of the setting center tube 11 (e.g., ...). Figure 8 On the inner wall of the center tube 11 (closer to the end of arrow β), the setting ball 141 can protrude radially inward from the inner wall of the lower end of the center tube 11. The setting ball 141 can be detachably connected to the center tube 11, for example, by fasteners such as screws or bolts, but this disclosure is not limited thereto; the setting ball 141 can also be integrally formed on the inner wall of the center tube 11.

[0090] The setting ball 142 can be a sphere or a spherical shape. The diameter (2R1) of the setting ball 142 is smaller than the inner diameter (2R2) of the setting center tube 11 at the setting position, and is greater than or equal to the distance (2L1) between the top surfaces of the setting ball seats 141. That is, the diameter of the setting ball 142 is smaller than the inner diameter of the setting center tube 11 at the setting position, but should be greater than or equal to the minimum inner diameter of the setting ball seats 141, so that when the setting ball 142 is placed in the inner cavity of the setting center tube 11, it can fall to the setting position and fit against the setting ball seats 141 to form a seal, thereby blocking the inner diameter of the setting center tube 11.

[0091] To ensure a tighter fit between the setting ball 142 and the setting seat 141, in this embodiment, the upper end of the setting seat 141 has an arc-shaped contact surface that matches the outer surface of the setting ball 142. For example, the upper end of the setting seat 141 (e.g., Figure 8 A portion of the end closer to arrow α is cut away to form an arc-shaped contact surface. After the setting ball 142 falls onto the upper end of the setting ball seat 141, it fits tightly against the arc-shaped contact surface, improving the sealing effect. Figure 8In the embodiment shown, a portion of the upper end of the setting ball seat 141 may be cut off to form an arcuate contact surface, but this disclosure is not limited thereto, and it may also be designed to match other contour shapes that match the shape of the setting and sealing member, such as a bevel.

[0092] In addition to the above embodiments where the setting ball 142 serves as the setting and sealing element and the setting ball seat 141 serves as the setting and limiting part, cooperating to form the setting assembly 14 to seal the inner diameter of the setting center tube 11, in another embodiment, a first diameter-changing section can be formed near the lower end of the setting center tube 11. This first diameter-changing section is a segment with a gradually decreasing inner diameter formed in the lower part of the setting center tube 11, and the inserted setting ball 142 can seal the first diameter-changing section. That is, the lower part of the setting center tube 11 forms a setting and limiting part by shrinking its inner diameter. The inner diameter of the setting center tube 11 at the setting position is less than or equal to the diameter of the setting ball 142, so that the setting ball 142 is positioned at the setting position and tightly fitted against the inner wall of the setting center tube 11, forming a seal.

[0093] The first setting cylinder sleeve 12 is fitted onto the outer wall of the setting center tube 11, and a unidirectional first liquid inlet chamber S1 with its opening facing downwards is formed between the first setting cylinder sleeve 12 and the setting center tube 11. The first liquid inlet chamber S1 communicates with the first through hole a, and the lower end of the first liquid inlet chamber S1 is open. A portion of the first annular setting piston 13 extends radially outward to be engaged between the lower end of the first setting cylinder sleeve 12 and the return cylinder 511. The first annular setting piston 13 is disposed in the first liquid inlet chamber S1 and seals the opening of the first liquid inlet chamber S1. That is, an axial seal is formed between the inner wall of the first annular setting piston 13 and the outer wall of the setting center tube 11, and an axial seal is formed between the outer wall of the first annular setting piston 13 and the inner wall of the first setting cylinder sleeve 12, sealing the opening of the first liquid inlet chamber. The upper end of the return sleeve 511 abuts against the first annular setting piston 13, and a first cavity T1 is formed between the return sleeve 511 and the setting center tube 11. The inner wall of the return sleeve 511 can also form a shaft seal with the setting center tube 11.

[0094] The aforementioned setting center tube 11, the lower part of the first setting cylinder sleeve 12, and the first annular setting piston 13 constitute the first hydraulic cylinder. The cylinder body of the first hydraulic cylinder is divided into upper and lower chambers (i.e., the first inlet chamber S1 and the first cavity T1) by the first annular setting piston 13. After pressurizing fluid (e.g., hydraulic oil) is supplied into the tubing, the hydraulic oil can enter the first inlet chamber S1 through the first through hole a, causing the first annular setting piston 13 to move downward under the action of oil pressure, that is, along the direction from the upper end of the first setting cylinder sleeve 12 to the lower end of the first setting cylinder sleeve 12 (e.g., ...). Figure 7The movement (in the direction indicated by the middle arrow β) pushes the return cylinder 511 downward, and a second axial shear force is formed through the transmission of the return cylinder 511. Under the action of the second axial shear force, the shearing fixing member 23 (described in detail below) will be sheared, thereby starting the setting seal.

[0095] In this embodiment, as Figure 7 As shown, the setting mechanism 1 may also include an upper connector 15, a setting intermediate connector 16, a second setting cylinder liner 17, a second annular setting piston 18, and a centering sleeve 19.

[0096] The upper connector 15, the intermediate setting connector 16, the second setting cylinder liner 17, the centralizing sleeve 19, and the setting center tube 11 are coaxially arranged. The upper connector 15, the intermediate setting connector 16, and the second annular setting piston 18 are disposed within the inner cavity of the second setting cylinder liner 17. The upper end of the upper connector 15 extends out of the inner cavity of the second setting cylinder liner 17, with the exposed portion connected to the drill pipe. The lower end of the upper connector 15 and the upper end of the intermediate setting connector 16 can be coaxially connected by threads, but this disclosure is not limited to this; they can also be detachably connected by fasteners such as screws or bolts. The lower end of the upper connector 15 protrudes radially outward, such that the outer diameter of the upper connector 15 at the lower end is equal to or slightly smaller than the inner diameter of the second setting cylinder liner 17, thereby ensuring a tight seal between the outer wall of the lower end of the upper connector 15 and the inner wall of the second setting cylinder liner 17.

[0097] The straightening sleeve 19 is detachably connected to the upper end of the upper connector 15 by fasteners such as screws and bolts.

[0098] The lower end of the setting intermediate joint 16 and the upper end of the setting center tube 11 can be coaxially connected by threads, but this disclosure is not limited to this. They can also be detachably connected by fasteners such as screws or bolts. The lower end of the setting intermediate joint 16 protrudes radially outward, so that the outer diameter of the setting intermediate joint 16 at the lower end is equal to or slightly smaller than the inner diameter of the first setting cylinder liner 12, thereby making the outer wall of the lower end of the setting intermediate joint 16 fit tightly with the inner wall of the first setting cylinder liner 12 to form a seal. A second through hole b is formed on the tube wall near the upper end of the setting intermediate joint 16.

[0099] The second setting cylinder sleeve 17 is fitted on the outer wall of the setting intermediate joint 16. The upper end of the second setting cylinder sleeve 17 abuts against the straightening sleeve 19, and the lower part of the second setting cylinder sleeve 17 forms a one-way opening second liquid inlet chamber S2 between the setting intermediate joint 16 and the setting cylinder sleeve 17. The opening direction is downward, and the second liquid inlet chamber S2 communicates with the second through hole b.

[0100] The second annular setting piston 18 is disposed within the second inlet chamber S2. A shaft seal is formed between the inner wall of the second annular setting piston 18 and the outer wall of the setting intermediate joint 16. The outer wall of the second annular setting piston 18 and the inner wall of the second setting cylinder liner 17 are connected by a threaded coaxial seal, thereby sealing the opening of the second inlet chamber S2. A portion of the second annular setting piston 18 protrudes radially outward to engage between the upper end of the first setting cylinder liner 12 and the lower end of the second setting cylinder liner 17. A second cavity T2 is formed between the upper part of the first setting cylinder liner 12 and the setting intermediate joint 16.

[0101] The aforementioned intermediate joint 16, the lower part of the second setting cylinder liner 17, the second annular setting piston 18, and the upper part of the first setting cylinder liner 12 constitute the second hydraulic cylinder. The cylinder body of the second hydraulic cylinder is divided into upper and lower chambers by the second annular setting piston 18 (i.e., the second inlet chamber S2 and the second cavity T2). After hydraulic oil is supplied to the tubing, the hydraulic oil enters the second inlet chamber S2 through the second through hole b, causing the second annular setting piston 18 to move downward under the action of oil pressure (e.g., ...). Figure 7 (Moves in the direction of arrow β), and pushes the first setting cylinder liner 12 downward, which in turn pushes the first annular setting piston 13 and the return cylinder 511 downward. It can be seen that, by setting a second cylinder structure, this embodiment can cooperate with the first cylinder to improve the efficiency of the second axial shear force formation, improve the efficiency of pushing the first setting cylinder liner 12 downward, so that the starting shear fixing member 23 is sheared, and the setting force of the suspension packer is increased.

[0102] According to this embodiment, the lower end of the setting intermediate joint 16 is connected to the upper end of the setting center tube 11, and the lower end of the setting intermediate joint 16 protrudes radially outward, so that the outer wall of the lower end of the setting intermediate joint 16 is tightly fitted with the inner wall of the first setting cylinder liner 12. On the one hand, the second cavity T2 and the first liquid inlet cavity S1 can be separated from each other. On the other hand, the outward protruding part of the lower end of the setting intermediate joint 16 is formed at the maximum displacement of the expected downward movement of the second annular setting piston 18, which can play a limiting role and prevent the second annular setting piston 18 from continuing to move downward.

[0103] like Figure 3 As shown, the seat hanging mechanism 2 may include a seat hanging center tube 21, a thrust sleeve 22, an activation shearing fixing member 23, and a seat hanging sealing assembly 24.

[0104] Among them, the upper end of the seated central tube 21 (such as Figure 9 The end closer to arrow α) is connected to the lower end of the setting center tube 11 via the release mechanism 3 (as shown in the image). Figure 7 Connect the end closer to arrow β.

[0105] The thrust sleeve 22 is fitted onto the outer wall of the mounting center tube 21, and the cross-section of the thrust sleeve 22 can be formed into a T-shape. That is, a radially inward protrusion is formed on the inner wall of the middle section of the thrust sleeve 22. The top surface of the protrusion is in close contact with the outer wall of the mounting center tube 21 and is fixed relative to the mounting center tube 21 by the actuation shear fixing member 23. A first insertion groove with a one-way opening is formed between the upper part of the thrust sleeve 22 and the outer wall of the mounting center tube 21, and the opening direction of the first insertion groove is upward. The lower end of the return sleeve 511 can be inserted into the first insertion groove and is coaxially threadedly connected to the thrust sleeve 22. A second insertion groove can also be formed between the lower part of the thrust sleeve 22 and the outer wall of the mounting center tube 21, and the opening direction of the second insertion groove is downward, for the locking sleeve 251 (described later) to be inserted, and is coaxially threadedly connected to the locking sleeve 251.

[0106] The initiating shearing fastener 23 is used to fix the thrust sleeve 22 relative to the seat center tube 21, and can be sheared under the action of a second axial shear force. The initiating shearing fastener 23 may include a number of shear pins or shear studs, however, this disclosure is not limited to this, and any fastener that can be sheared under the action of external force is acceptable.

[0107] The seat-mounted sealing assembly 24 is connected to the lower end of the thrust sleeve 22 and can move to the seat position under the thrust of the thrust sleeve 22, so that the seat-mounted sealing assembly 24 is fixed to the sleeve (e.g., Figure 13 The inner wall of the sleeve 107) forms a seal with the inner wall of the sleeve.

[0108] The return sleeve 511 transmits the force generated by the setting mechanism 1 to the starting shear fixing member 23 and forms a second axial shear force. Under the action of the second axial shear force, the starting shear fixing member 23 is sheared, thereby disconnecting the connection between the thrust sleeve 22 and the mounting center tube 21. The thrust sleeve 22 can move downward, and the mounting sealing assembly 24 moves to the mounting position under the thrust of the thrust sleeve 22, so that the mounting sealing assembly 24 is fixed on the inner wall of the sleeve and forms a sealing connection with the inner wall of the sleeve. The suspension packer completes the setting and mounting.

[0109] like Figure 9 As shown in the figure, in this embodiment, the seat-hanging sealing assembly 24 may include a rubber tube 241, a rubber tube seat 242, an upper cone 243, a seat-hanging shearing fastener 244, a slip support 245, a slip 246, a lower cone 247, and a cone pressure cap 248.

[0110] The rubber sleeve 241 is fitted onto the outer wall of the seat center tube 21 and is close to the lower end of the thrust sleeve 22 (such as near the bottom). Figure 9The end of the arrow β) abuts against the sleeve, and the rubber sleeve 241 is configured to deform under the thrust of the thrust sleeve 22, expanding radially outward, so that the radial dimension of the rubber sleeve 241 can fill the outer wall of the seated center tube 21 and the sleeve (such as...). Figure 13 The space between the inner circumference of the sleeve 107 in the middle allows the suspended packer and the inner wall of the sleeve to form a sealed connection.

[0111] A rubber sleeve seat 242 is fitted onto the outer wall of the mounting center tube 21. The upper end face of the rubber sleeve seat 242 supports the lower end face of the rubber sleeve 241 to prevent the rubber sleeve 241 from moving along the gap between the mounting center tube 21 and the sleeve. A third insertion groove with a one-way opening is formed between the rubber sleeve seat 242 and the outer wall of the mounting center tube 21, with the opening of the third insertion groove facing downwards.

[0112] The upper end of the upper cone 243 is inserted into the third insertion groove, and the upper end of the upper cone 243 and the lower end of the rubber sleeve seat 242 can be coaxially connected by threads. The lower part of the upper cone 243 is formed into a tapered structure, and the tapered surface of the lower part of the upper cone 243 is inclined from the upper end to the lower end of the upper cone 243. That is to say, the distance from the tapered surface of the upper cone 243 to the axis of the mounting center tube 21 gradually decreases from the upper end to the lower end. For example, the angle between the tapered surface of the upper cone 243 and the axis of the mounting center tube 21 can be 5-20 degrees.

[0113] The seat-hanging shearing fastener 244 fixes the upper cone 243 relative to the seat-hanging central tube 21 and can be sheared under the action of a third axial shearing force. The seat-hanging shearing fastener 244 may include a number of shear pins or shear nails. However, this disclosure is not limited to this. Any fastener that can be sheared under the action of external force is acceptable.

[0114] The upper part of the lower cone 247 is formed into a cone-shaped structure. The cone surface of the upper part of the lower cone 247 is inclined from the lower end of the lower cone 247 to the upper end of the lower cone 247. That is to say, in the direction from the upper end to the lower end, the distance from the cone surface of the lower cone 247 to the axis of the seated central tube 21 gradually increases.

[0115] The slip support 245 can be coaxially connected to the outer wall of the conical pressure cap 248 (described later) via threads, and the slip support 245 can move relative to the upper cone 243 towards its lower end. The upper and lower ends of the slip support 245 can be coaxially connected to the conical pressure cap 248 via threads, and the inner wall of the conical pressure cap 248 can coaxially engage with the outer wall of the upper cone 243. The conical pressure cap 248 coaxially engages with the upper cone 243 and the lower cone 247, and the inner wall of the conical pressure cap 248 is detachably connected to the outer walls of the upper cone 243 and the lower cone 247 via fasteners such as screws or bolts.

[0116] The locking piece 246 is fitted inside the locking piece support 245. The locking piece 246 has a semi-cylindrical structure and is composed of multiple locking pieces evenly distributed circumferentially. Each locking piece has a toothed structure on its outer wall, which points downwards at an angle to the outer wall surface. The locking pieces are arranged in two symmetrical groups: a first group of locking pieces 246b at the top and a second group of locking pieces 246a at the bottom. The lower end of the first group of locking pieces 246b is connected to the upper end of the second group of locking pieces 246a and is fixedly connected to the mounting center tube 21 by bolts. The upper part of the semi-cylindrical inner wall of the first group of locking pieces 246b has a smooth conical surface structure that mates with the conical surface of the upper cone 243, forming a space between the conical surface of the first group of locking pieces 246b and the outer wall of the mounting center tube 21 for the upper cone 243 to be inserted. The lower end of the inner wall of the second set of clips 246a, which is a cylindrical structure, has a conical surface that mates with the conical surface of the lower cone 247. A space is formed between the conical surface of the second set of clips 246a and the outer wall of the mounting center tube 21 for the lower cone 247 to be inserted. When the first set of clips 246b is pressed downwards by the upper cone 243, the first set of clips 246b can slide upwards relative to the conical surface of the upper cone 243, thus being opened. Similarly, when the second set of clips 246a is pressed upwards by the lower cone 247, the second set of clips 246a slides downwards relative to the conical surface of the lower cone 247, thus being opened.

[0117] When the device needs to be hung, the thrust sleeve 22 is subjected to a downward thrust and reaches the second axial shear force, triggering the shearing fixing member 23 to be sheared, and the thrust sleeve 22 moves downward (as shown in the image). Figure 9 The rubber sleeve 241 is pushed in the direction of arrow β, causing it to expand and fit tightly against the inner wall of the sleeve, while continuing to transmit downward thrust to the rubber sleeve seat 242 and the upper cone 243. When the thrust at the upper cone 243 reaches the third axial shear force, the seat shear fixing member 244 can be sheared under the action of the third axial shear force. After the seat shear fixing member 244 is sheared, the connection between the upper cone 243 and the seat center tube 21 is broken, allowing it to move downward. After the slip 246 is squeezed and opened, the toothed structure on its outer wall engages with the inner wall of the sleeve, thereby fixing the position of the slip 246 inside the sleeve, achieving seat hanging inside the sleeve.

[0118] In this embodiment, the seat-hanging mechanism 2 may further include a locking component 25, which is connected to the lower end of the thrust sleeve 22 and can move to the locking position under the thrust of the thrust sleeve 22, so that the seat-hanging sealing component 24 is locked in the seat-hanging position. The seat-hanging sealing component 24 is connected to the locking component 25.

[0119] like Figure 9As shown, the locking assembly 25 may include a locking sleeve 251 and a locking ring 252. The locking sleeve 251 is fitted onto the outer wall of the seat center tube 21, and the upper end of the locking sleeve 251 is inserted into the second insertion groove of the thrust sleeve 22. The outer wall of the locking sleeve 251 and the inner wall of the thrust sleeve 22 are coaxially connected by threads, and a third cavity is formed between the inner wall of the locking sleeve 251 and the seat center tube 21. The lower end of the locking sleeve 251 abuts against the upper end of the rubber sleeve 241. The locking ring 252 is formed inside the third cavity and can cooperate with the locking sleeve 251 under the thrust of the thrust sleeve 22 to lock the seat sealing assembly 24 in the seat position. In this embodiment, the outer wall of the mounting center tube 21 is provided with a one-way tooth for the locking ring 252 to slide downwards. The inner wall of the locking ring 252 has a counter-one-way tooth that meshes with the one-way tooth on the outer wall of the mounting center tube 21. The locking ring 252 can slide downwards along the one-way tooth on the outer wall of the mounting center tube 21 under the action of thrust. For example, the cross-section of the one-way tooth in the vertical direction can be a right triangle, and the distance between the hypotenuse of the right triangle and the mounting center tube 21 gradually increases from top to bottom. However, this disclosure is not limited to this, and the one-way tooth can also be other structures, as long as it can enable the locking ring 252 to slide downwards unidirectionally along the mounting center tube 21. During the mounting process, the locking assembly 25 moves downwards synchronously under the thrust of the thrust sleeve 22, locking the slip 246 and the rubber sleeve 241 in the mounting position, preventing them from retracting.

[0120] According to this embodiment, by setting the locking component 25, the setting and hanging sealing component 24 can be locked in the setting and hanging position after the suspension packer has completed the setting and hanging. This prevents the setting and hanging sealing component 24 from returning to its original position due to insufficient thrust of the thrust sleeve 22 caused by pressure changes in the wellbore. That is, the compressed rubber sleeve 241 and slip 246 will retract, resulting in the failure of setting and hanging.

[0121] Figure 10 A schematic diagram of the release mechanism of a suspended well completion integrated packer according to an exemplary embodiment of the present disclosure is shown; Figure 11 It shows Figure 10 An enlarged schematic diagram of part D in the diagram.

[0122] Among them, such as Figure 10 and Figure 11 As shown, the dropping mechanism 3 may include a dropping cap 31, a dropping spring lock tube 32, a dropping lock head 33, a dropping shearing fastener 34, a dropping assembly 35, and a center coupling 38.

[0123] The upper part of the release spring-lock tube 32 is disposed inside the return sleeve 511 and fits tightly against the inner wall of the return sleeve 511 to form a shaft seal. The lower part of the release spring-lock tube 32 may be provided with evenly distributed spring claws to apply a circumferential preload to the release lock head 33. Furthermore, the spring claws may also be provided with a left-hand external thread structure, which is coaxially connected to the inner wall of the central coupling 38 through the left-hand thread. When the release mechanism fails to release normally, the release can be achieved by rotating the tube clockwise. However, this disclosure is not limited to this. The spring claws of the release spring-lock tube 32 are not limited to being provided with a left-hand external thread. They may also be provided with a right-hand external thread, a locking mechanism, a toothed mechanism, etc., as long as they can cooperate with the central coupling 38 to achieve a mechanical release.

[0124] The release lock head 33 is coaxially sealed with the release spring tube 32 and the center coupling 38, and the release lock head 33 is detachably fixed to the inner wall of the release spring tube 32 by the release shearing fastener 34. An axial seal is formed between the upper end of the release lock head 33 and the upper inner wall of the release spring tube 32. The lower part of the release lock head 33 may have a reduced diameter section, so that a one-way downward opening sealing assembly mounting cavity is formed between the outer wall of the reduced diameter section of the release lock head 33 and the inner wall of the center coupling 38. The sealing assembly 37 is installed in the sealing assembly mounting cavity. Furthermore, the upper end of the release lock head 33 can simultaneously support the setting center tube 11 and the setting ball seat 141. Specifically, the upper end face of the release lock head 33 can be supported on the lower end face of the setting center tube 11, and the upper end face of the release lock head 33 can partially or completely overlap with the lower end face of the setting ball seat 141 to support the lower end face of the setting ball seat 141. Thus, the lower end face of the setting ball seat 141 can be blocked from moving downward by the support of the upper end face of the release lock head 33.

[0125] The release shearing fastener 34 fixes the release lock head 33 relative to the release spring tube 32 and can be sheared under the action of a fourth axial shearing force. The release shearing fastener 34 may include a plurality of shear pins or shear studs, however, this disclosure is not limited to this, and any fastener that can be sheared under the action of external force is acceptable.

[0126] The outer wall of the center coupling 38 forms a shaft seal with the inner wall of the lower end of the return sleeve 511. The upper end of the center coupling 38 abuts against the release spring lock tube 32. The lower end of the center coupling 38 can be coaxially connected to the seated center tube 21 by threads. The lower end of the center coupling 38 can also be inserted into the first insertion groove of the thrust sleeve 22 and supported by the bottom of the first insertion groove.

[0127] The release cap 31 can be set at the lower end of the release lock head 33, for example, by fasteners such as screws to the outer wall of the release lock head 33. When the sealing assembly 37 is placed in the installation space, the release cap 31 can support the lower bottom surface of the sealing assembly 37. The axial fixation of the sealing assembly 37 can be achieved by setting the release cap 31.

[0128] The release assembly 35 is configured to block the inner cavity of the release lock 33 near its upper part. The release assembly 35 may include a release limiting part and a release sealing member. The release limiting part is formed on the inner wall of the release lock 33. The release sealing member is placed in the inner cavity of the release lock 33 and abuts against the release limiting part. The release sealing member is restricted by the release limiting part from moving towards the lower end of the release lock 33, and the inner wall of the release lock 33 cooperates with the release limiting part to block the inner cavity of the release lock 33. Similar to a seated sealing member, the release sealing member can also be a sphere, a quasi-sphere, a hemisphere, or a semi-hemisphere, as long as the release sealing member and the release limiting part cooperate to form a seal within the inner cavity of the release lock 33.

[0129] In this embodiment, as Figure 10 As shown, the dropper assembly 35 may include a dropper limiting part and a dropper blocking member. The dropper blocking member may be a dropper ball 351, similar to the seated limiting part. The dropper limiting part may be a second variable diameter section 352 formed by one end of the dropper lock head 33. The second variable diameter section 352 is a section where the inner diameter of the dropper lock head 33 gradually decreases, and the dropped ball 351 can block the second variable diameter section 352 when inserted. That is, the upper end of the dropper lock head 33 can form a dropper limiting part by shrinking its inner diameter, and the inner diameter of the dropper lock head 33 at the blocking position is less than or equal to the diameter of the dropper ball 351, so the dropped ball 351 can block the dropper limiting part.

[0130] The release limiting part disclosed herein is not limited to this; the release limiting part may also be a release ball seat (similar to) arranged circumferentially on the inner wall of the release lock head. Figure 7 and Figure 8 The diameter of the drop ball 351 in the setting ball seat 141 can be smaller than the inner diameter of the drop lock head 33 at the blocking position, and greater than or equal to the distance between the top surfaces of the drop ball seats. That is, the diameter of the drop ball 351 is smaller than the inner diameter of the drop lock head 33 at the blocking position, but should be greater than or equal to the minimum inner diameter of the drop ball seat, so that it can fall into the blocking position and fit against the drop ball seat to form a seal, thereby blocking the inner diameter of the drop lock head 33. The arrangement of the drop ball 351 and the drop ball seat can be similar to that of the setting ball 142 and setting ball seat 141 described above, and will not be elaborated further here.

[0131] In this embodiment, as Figure 7 and Figure 8As shown, the setting mechanism 1 may also include a spare setting shearing fastener 143, which fixes the setting ball seat 141 relative to the inner wall of the lower end of the setting center tube 11 and can be sheared under the action of the fifth axial shear force.

[0132] During on-site construction, if the suspension packer needs to be independently set and hung according to process requirements, first, the setting ball 142 is deployed to complete the setting and hanging of the suspension packer. After verifying that the suspension packer has been set and hung, the liquid in the tubing is pressurized and the pressure is further increased. When the liquid in the tubing reaches the set pressure value, because the setting ball seat 141 and the setting ball 142 block the inner diameter of the setting center tube 11, the standby setting shear fixing component 143 is sheared by the fifth axial shear force, and the setting ball seat 141 and the setting ball 142 are lowered (e.g., ...). Figure 10 The middle part moves in the direction of arrow β until it is blocked by the upper end face of the release lock head 33, causing the release lock head 33 to be subjected to a downward thrust to form a fourth axial shear force, which causes the release shearing fixing member 34 to be sheared, the release mechanism 3 is activated, and the release lock head 33 moves downward. When the outer wall of the lower end of the release lock head 33 disengages from the inner wall of the release spring lock tube 32, the tube column can be lifted to realize the release function.

[0133] If the setting and hanging are achieved in conjunction with the naked-eye packer, after the ball is thrown onto the ball seat of the tool column at the lower end of the suspension packer to complete the setting and hanging, the drop ball 351 is dropped to pressurize the liquid in the column. When the liquid in the column reaches the set pressure value, because the drop ball 351 and the second reducing section 352 block the inner diameter of the drop lock head, the drop shear fixing member 34 is subjected to a downward thrust to form a fourth axial shear force, causing the drop shear fixing member 34 to be sheared. The drop mechanism 3 is activated, and the drop lock head 33 moves downward (as shown). Figure 10 Move towards the direction of arrow β. When the outer wall of the lower end of the release lock head 33 disengages from the inner wall of the release spring lock tube 32, the tube column can be lifted to achieve the release function.

[0134] Furthermore, if the release lock head 33 encounters resistance and does not move downwards, the release can be achieved mechanically by rotating the tube column clockwise through the left-hand external thread structure of the release spring pawl 32. After the release mechanism 3 completes the release, the release mechanism 3 and the setting mechanism 1 can be removed.

[0135] In this embodiment, the release mechanism 3 eliminates the pressure regulating valve without changing the release principle of hydraulic or mechanical reverse coupling, which can improve the compressive strength of the tubing string and enable it to perform the release function without restriction in deep wells with a high specific gravity of the kill fluid.

[0136] In this embodiment, as Figure 10 and Figure 11As shown, the release mechanism 3 may also include a release force-applying assembly 36. The release force-applying assembly 36 may include a release force-applying sleeve 361, a release force-applying push rod 362, and a release force-applying shearing fixing member 363.

[0137] The release sleeve 361 is installed on the inner wall of the return sleeve 511, and the upper end of the release sleeve 361 (e.g.) Figure 10 The end closer to arrow α) and the lower end of the setting center tube 11 (such as Figure 10 The lower end of the release sleeve 361 and the upper end of the release spring lock tube 32 are connected by a threaded coaxial seal. The end closer to arrow β is connected by a threaded coaxial seal.

[0138] The release lever 362 is disposed on the inner wall of the release sleeve 361. The inner diameter of the lower end of the release lever 362 should be the same as or similar to the inner diameter of the upper end of the release lock head 33, so that the end face of the lower end of the release lever 362 can abut against the end face of the upper end of the release lock head 33. In other words, the relationship between the inner diameter of the lower end of the release lever 362 and the inner diameter of the upper end of the release lock head 33 should be such that the end face of the lower end of the release lever 362 and the end face of the upper end of the release lock head 33 can at least partially overlap, so that the end face of the upper end of the release lock head 33 can support the lower end of the release lever 362. Furthermore, as... Figure 5 As shown, the inner wall of the release-force pusher 362 may be formed with a release-force variable diameter section 361a. The release-force variable diameter section 361a is a section with a gradually decreasing inner diameter formed at the upper end of the release-force pusher 362, and the minimum inner diameter (2L2) of the release-force pusher 362 at the release-force variable diameter section 361a is smaller than the distance (2L1) between the top surfaces of the set ball seat 141, so that the release-force variable diameter section 361a provided on the release-force pusher 362 can block the downward movement of the set ball seat 141.

[0139] The release-force-adjusting shearing fastener 363 fixes the release-force-adjusting push rod 362 and the release-force-adjusting sleeve 361 relative to each other, and can be sheared under the action of a sixth axial shearing force. The release-force-adjusting shearing fastener 363 may include a number of shear pins or shear studs, however, this disclosure is not limited to this, and any fastener that can be sheared under the action of external force is acceptable.

[0140] During on-site construction, the setting ball 142 is first deployed to set the suspended packer. After verifying that the suspended packer achieves independent setting, the pressure is further increased. When the standby setting shear fixing member 143 is sheared by the fifth axial shear force, the setting ball seat 141 and the setting ball 142 move downwards (as shown). Figure 10After moving in the direction of arrow β, it is blocked by the release force-adjusting variable diameter section 361a set in the release force-adjusting push rod 362, and the release force-adjusting push rod 362 is pushed downward to continue to increase the liquid pressure, so that the release force-adjusting shearing fixing member 363 is sheared by the sixth axial shearing force. The release force-adjusting push rod 362 moves downward due to the thrust of the setting ball seat 141 and the setting ball 142 and its own weight, so that the release lock head 33 is subjected to a downward thrust. When the release shearing fixing member 34 is subjected to a downward thrust and reaches the fourth axial shearing force, the release shearing fixing member 34 is sheared, and the release lock head 33 moves downward to realize the release function.

[0141] If the setting and mounting are achieved in conjunction with the open-hole packer, after the ball is dropped onto the ball seat of the tool string at the lower end of the suspended packer to complete the setting and mounting, the drop ball 351 is deployed to pressurize the fluid in the string. When the fluid in the string reaches the set pressure value, the drop ball 351 and the second diameter section 352 block the inner diameter of the drop lock head, causing the drop shear fixing member 34 to be pushed downward to form the fourth axial shear force, and the drop shear fixing member 34 is sheared. If the drop lock head 33 encounters resistance and does not move downward at this time, and pressurization continues to be applied to the wellbore, the fluid in the string will be blocked by the drop force-enhancing diameter section 361a, causing the drop force-enhancing push rod 362 to be pushed downward. When the force on the drop force-enhancing shear fixing member 363 reaches the sixth axial shear force, the drop force-enhancing shear fixing member 363 is sheared, and the drop force-enhancing push rod 362 can move downward and push the drop lock head 33 downward to achieve the release.

[0142] The release force-applying component 36 in this embodiment provides an additional downward pushing force to the release lock head 33 when it encounters resistance, helping the outer wall of the lower end of the release lock head 33 disengage from the inner wall of the spring claw of the release spring tube 32, thus releasing the lock. Alternatively, if the release force-applying component 36 fails to release the lock, the release can be achieved by rotating the tube clockwise through the left-hand external thread structure on the spring claw of the release spring tube 32, mechanically reversing the thread. After the release mechanism 3 completes the release, both the release mechanism 3 and the setting mechanism 1 can be removed.

[0143] Figure 12 A schematic diagram of the unsealing mechanism of a suspended well completion integrated packer, an exemplary embodiment of the present disclosure, is shown.

[0144] Among them, such as Figure 12 As shown, the upper end of the unsealing mechanism 4 is connected to the mounting mechanism 2 to unseal the suspended packer. If the packer accidentally gets stuck during the insertion of the tubing, the unsealing mechanism 4 can be activated to lift the tubing and unseal it.

[0145] like Figure 12As shown, the unsealing mechanism 4 includes an unsealing sleeve 41, an unsealing claw 42, an unsealing shearing and fixing member 43, and an unsealing assembly 44. The upper end of the unsealing sleeve 41 (as shown) Figure 12 The end closer to arrow α) and the lower end of the seated center tube 21 (such as Figure 12 The lower end of the unsealing sleeve 41 is abutted against the inner wall of the unsealing claw 42 by the unsealing shearing fastener 43. The unsealing claw 42 is sleeved on the outer wall of the unsealing sleeve 41. The upper end of the unsealing claw 42 can be coaxially and sealed with the lower end of the sitting center tube 21 by thread. The lower end of the unsealing claw 42 can be provided with several evenly distributed claws to apply a circumferential preload to the unsealing sleeve 41. The unsealing shearing fastener 43 fixes the unsealing sleeve 41 and the unsealing claw 42 relative to each other and can be sheared under the action of the seventh axial shear force. The unsealing shearing fastener 43 may include several shear pins or shear nails. However, this disclosure is not limited to this. Any fastener that can be sheared under the action of external force is acceptable. The unsealing assembly 44 is configured to block the inner cavity of the unsealing sleeve 41 near the unsealing sleeve 41.

[0146] The unsealing component 44 may include an unsealing limiting part and an unsealing plug. The unsealing limiting part is formed on the inner wall of the unsealing sleeve 41. The unsealing plug is placed in the inner cavity of the unsealing sleeve 41 and abuts against the unsealing limiting part. The unsealing plug is restricted by the unsealing limiting part from moving towards the lower end of the unsealing sleeve 41, and the inner wall of the unsealing sleeve 41 cooperates with the unsealing limiting part to seal the inner cavity of the unsealing sleeve 41. Similar to a seated plug, the unsealing plug can also be a sphere, a quasi-sphere, a hemisphere, a semi-hemisphere, etc., as long as the unsealing plug and the unsealing limiting part cooperate to form a seal in the inner cavity of the unsealing sleeve 41.

[0147] In this embodiment, as Figure 12 As shown, the unsealing component 44 may include an unsealing limiting part and an unsealing blocking member. The unsealing blocking member may be an unsealing ball 441, similar to the setting limiting part. The unsealing limiting part may be a third variable diameter section 442 formed at one end of the unsealing sleeve 41. The third variable diameter section 442 is a section with a gradually decreasing inner diameter formed at one end of the unsealing sleeve 41. The inserted unsealing ball 441 can block the third variable diameter section 442. That is, one end of the unsealing sleeve 41 can form an unsealing limiting part by shrinking its inner diameter, and the inner diameter of the unsealing sleeve 41 at the blocking position is less than or equal to the diameter of the unsealing ball 441. The inserted unsealing ball 441 can block the unsealing limiting part.

[0148] The unsealing limiting part disclosed herein is not limited to this; the unsealing limiting part may also be an unsealing ball seat (similar to) provided circumferentially on the inner wall of the unsealing sleeve 41. Figure 1 and Figure 2The diameter of the unsealing ball 441 is smaller than the inner diameter of the unsealing sleeve 41 at the sealing position, and greater than or equal to the distance between the top surfaces of the drop ball seats. In other words, the diameter of the unsealing ball 441 is smaller than the inner diameter of the unsealing sleeve 41 at the sealing position, but should be greater than or equal to the minimum inner diameter of the unsealing ball seat, so that when the unsealing ball 441 is placed in the inner cavity of the unsealing sleeve 41, it can cooperate with the unsealing ball seat at the sealing position to form a seal. The arrangement of the unsealing ball 441 and the unsealing ball seat can also be similar to that of the unsealing ball 142 and the unsealing ball seat 141 described above, which will not be elaborated further here.

[0149] If the packer malfunctions during installation and becomes prematurely engaged, or if tool retrieval is required during subsequent well workover, the inner cavity of the release sleeve 41 is sealed using the release assembly 44. Then, pressure is applied to the tubing string, causing the release sleeve 41 to be subjected to downward pressure (e.g., ...). Figure 12 The seventh axial shear force (in the direction of arrow β) causes the unsealing shearing fastener 43 to be sheared off, and the unsealing sleeve 41 moves downward until the outer wall of the unsealing sleeve 41 disengages from the inner wall of the unsealing claw 42, and the seated central tube 21 loses its constraint and can move upward (as if...). Figure 12 The middle part moves in the direction of arrow α, thereby allowing the seated sealing assembly 24 to return to its initial state and thus releasing the suspension packer.

[0150] In this embodiment, it should be noted that, Figure 7 , Figure 10 , Figure 9 as well as Figure 12 By connecting them sequentially, a complete suspended well completion packer of this disclosure can be formed. However, those skilled in the art should understand that this disclosure is not limited thereto. Figure 7 , Figure 10 , Figure 9 as well as Figure 12 Some of the components shown can be removed or replaced.

[0151] The following describes the working principles of the setting mechanism, hanging mechanism, release mechanism, and unsealing mechanism in the suspended well completion integrated packer of this exemplary embodiment.

[0152] The principles of the sealing mechanism, hanging mechanism, and release mechanism when the seal is independently seated and hung:

[0153] If, according to process requirements, an independent setting and hanging packer is needed, firstly, the setting ball seat 141 and the setting ball 142 block the inner cavity of the setting center tube 11, then pressure is applied to the tube string. The pressure is transmitted to the first inlet chamber S1 through the first through hole a, thereby pushing the first annular setting piston 13 and the first setting cylinder liner 12 downwards (e.g., ...). Figure 7The middle section moves in the direction of arrow β, and through the transmission of the return sleeve 511, a second axial shear force is generated, causing the starting shear fixing member 23 to be sheared, pushing the thrust sleeve 22 to move. The seated sealing assembly 24 moves to the seated position under the thrust of the thrust sleeve 22, so that the seated sealing assembly 24 is fixed on the inner wall of the sleeve and forms a seal with the inner wall of the sleeve. The suspension packer completes the seating and mounting. After the seating and mounting are completed, the liquid in the tubing is pressurized and the pressure is increased. When the liquid in the tubing reaches the set pressure value, the settling ball seat 141 and the settling ball 142 block the inner diameter of the settling center tube, causing the standby settling shear fixing member 143 to be sheared under the action of the fifth axial shear force. The settling ball seat 141 and the settling ball 142 move downward (as shown in the image). Figure 10 (Moves towards the direction of arrow β) until blocked by the upper end face of the release lock head 33, causing the release lock head 33 to be subjected to a downward thrust to form a fourth axial shear force, causing the release shearing fixing member 34 to be sheared, the release mechanism 3 is activated, the release lock head 33 moves downward, and when the outer wall of the lower end of the release lock head 33 disengages from the inner wall of the release spring lock tube 32, the tube column can be lifted to realize the release function.

[0154] If a release and force-applying assembly 36 is provided, when the spare setting shear fixing member 143 is sheared under the action of the fifth axial shear force, the setting ball seat 141 and the setting ball 142 will move downwards (as shown in the image). Figure 10 After moving in the direction of arrow β, it is blocked by the release force-adjusting variable diameter section 361a set in the release force-adjusting push rod 362, and the liquid pressure continues to increase, so that the release force-adjusting shearing fixing member 363 is sheared by the sixth axial shearing force. The release force-adjusting push rod 362 moves downward due to the thrust of the setting ball seat 141 and the setting ball 142 and its own weight, so that the release lock head 33 is subjected to a downward thrust to form a fourth axial shearing force, the release shearing fixing member 34 is sheared, and the release lock head moves downward to realize the release function.

[0155] The operating principles of the sealing mechanism, the hanging mechanism, and the release mechanism during the linkage sealing and hanging process are as follows:

[0156] If, according to process requirements, it is necessary to link the setting and hanging with the naked eye packer, the setting assembly 14 does not need to block the inner cavity of the setting center tube 11 to start the setting and hanging. Instead, the ball is thrown onto the ball seat of the tool column at the lower end of the suspended packer, thereby blocking the tool column and applying pressure to the column. The downward force can then be transmitted through the first setting cylinder liner 12, the return cylinder 511, etc., so that the suspended packer can complete the setting and hanging. After the setting and hanging are completed, the drop ball 351 is inserted to pressurize the liquid in the tubing. When the liquid in the tubing reaches the set pressure value, the drop ball 351 and the second diameter reducing section 352 block the inner diameter of the drop lock head, causing the drop shear fixing member 34 to be pushed downward to form a fourth axial shear force. The drop shear fixing member 34 is sheared, the drop mechanism 3 is activated, and the drop lock head 33 moves downward. When the outer wall of the lower end of the drop lock head 33 disengages from the inner wall of the drop spring lock tube 32, the tubing can be lifted to realize the drop function.

[0157] If a release force-applying assembly 36 is installed, after setting and locking, the release ball 351 is engaged to pressurize the liquid in the tubing. When the liquid in the tubing reaches the set pressure value, the release ball 351 and the second diameter-changing section 352 block the inner diameter of the release lock head, causing the release shear fixing member 34 to be subjected to a downward thrust to form a fourth axial shear force, and the release shear fixing member 34 is sheared. If the release lock head 33 encounters resistance and does not move downward at this time, and continues to pressurize into the wellbore, the liquid in the tubing will be blocked by the release force-applying diameter-changing section 361a, causing the release force-applying push rod 362 to be subjected to a sixth axial shear force, causing the release force-applying shear fixing member 363 to be sheared. The release force-applying push rod 362 moves downward, causing the release lock head 33 to be subjected to a downward thrust to form a fourth axial shear force, the release shear fixing member 34 is sheared, and the release lock head moves downward to achieve release.

[0158] The operating principle of the unsealing mechanism:

[0159] If the packer malfunctions during installation and becomes prematurely engaged, or if tool retrieval is required during subsequent well workover, the inner cavity of the release sleeve 41 is sealed using the release assembly 44. Then, pressure is applied to the tubing string, causing the release sleeve 41 to be subjected to downward pressure (e.g., ...). Figure 12 The seventh axial shear force (in the direction of arrow β) causes the unsealing shear fastener 43 to be sheared off, and the unsealing sleeve 41 moves downward until the outer wall of the unsealing sleeve 41 disengages from the inner wall of the unsealing claw 42. The seated central tube 21 loses its constraint and can move upward (as if...). Figure 12 The middle part moves in the direction of arrow α, thereby restoring the seated sealing assembly to its initial state and releasing the suspension packer.

[0160] In a fifth exemplary embodiment of this disclosure, a completion string is also provided, the completion string including the suspended integrated packer as described in the fourth exemplary embodiment above.

[0161] Figure 13 A schematic diagram of a completion string according to an exemplary embodiment of the present disclosure is shown.

[0162] like Figure 13 As shown, the completion string includes an upper completion string and a lower completion string connected together. The upper completion string includes a suspended packer E capable of independent setting and hanging. The suspended packer E may include a reconnection device as described in any of the exemplary embodiments above, and may also include at least one of a setting mechanism, a hanging mechanism, a release mechanism, and a release mechanism.

[0163] The lower completion string may include, sequentially mounted on the casing, a ball-dropping sleeve 101, an open-hole packer 102, a differential pressure sleeve 103, a tail-setting assembly 104, and a guide shoe + screen pipe 105. The ball-dropping sleeve 101, the open-hole packer 102, and the differential pressure sleeve 103 form a set of sleeve fracturing units. At least one set of sleeve fracturing units may be installed sequentially, and the number of stages can be determined according to the stage of fracturing completion construction. For example, in a three-stage fracturing completion construction example... Figure 13 Three sets are provided. The tail setting assembly 104 may include a tail setting ball seat, a tail setting ball, and a back pressure valve. The tail setting ball can block the inner diameter of the preset ball seat, and setting can be achieved by the interaction of the tail setting ball and the tail setting ball seat.

[0164] Figure 14 A flowchart of the reconnection process for the reconnection device of the suspended well completion integrated packer disclosed herein is shown.

[0165] In the sixth exemplary embodiment of this disclosure, a reconnection process for a suspended well completion packer is provided. This reconnection process is implemented using the reconnection device of any of the above exemplary embodiments, such as... Figure 14 As shown, the reconnection process includes the following steps:

[0166] S1. The insertion unit is inserted into the reconnection sleeve for trial reconnection. Specifically, since the uppermost end of the tubing string needs to be exactly at the wellhead after the reconnection operation, a measuring tubing is connected to the upper end of the wellhead before the reconnection operation is completed. A certain amount of tubing weight is lowered to allow the insertion unit to be inserted into the reconnection sleeve for trial reconnection. Before the trial reconnection, the tubing (including the insertion unit) is held up. A certain amount of tubing weight is lowered to allow the insertion unit to be inserted into the reconnection sleeve for trial reconnection. The trial reconnection is completed when the reverse locking structure of the reconnection spring claw enters the forward locking structure of the reconnection sleeve.

[0167] When the reconnection device is equipped with a protective sleeve and a reconnection shearing fastener, the insertion unit is lowered. When the lower end of the protective sleeve is blocked by the upper end of the reconnection locking sleeve, the weight of the oil pipe suspended during the reconnection is insufficient to generate the first axial shear force to cut the reconnection shearing fastener. The reconnection shearing fastener is not cut, and the protective sleeve covers the reverse locking structure of the reconnection spring claw to prevent it from engaging with the forward locking structure of the reconnection locking sleeve during the reconnection test to form a lock. At this point, it can be determined that the reconnection position is feasible, and the reconnection test is completed.

[0168] S2. Measure the length of the depth-adjusting tubing required at the wellhead during the trial reconnection. Specifically, after determining that the trial reconnection is complete, raise the tubing and insertion unit. Based on the distance the trial reconnection was lowered, measure the length of the measuring tubing that was lowered into the wellhead during the trial reconnection. This is the length of the depth-adjusting tubing required at the wellhead. (When the reconnection device is equipped with a protective sleeve and a reconnection shearing fixing component, the reconnection spring claw and / or reconnection locking sleeve are not in the reconnection position during the trial reconnection, but the distance is small and can be ignored.) Replace the measuring tubing with the depth-adjusting tubing of the measured length to prepare for the subsequent installation of the wellhead tree.

[0169] S3. Complete the reconnection operation. Specifically, lower the oil pipe suspension weight, lower the insertion unit so that the reverse locking structure of the reconnection spring claw and the forward locking structure of the reconnection sleeve cooperate to form a lock, thus completing the reconnection operation.

[0170] When the reconnection device is equipped with a protective sleeve and a reconnection shearing fastener, such as Figure 6 As shown, based on the suspended weight of the oil pipe during the trial reconnection, the suspended weight of the lowered oil pipe is increased. The lower end face of the protective sleeve 526a abuts against the upper end face of the reconnection locking sleeve 512, causing the reconnection shearing fixing member 526b to be sheared by the first axial shear force. The protective sleeve 526a moves downward (as shown). Figure 6 The middle part moves in the direction of arrow α, exposing the reverse locking structure covered by the return pawl 523, thereby cooperating with the forward locking structure of the return lock sleeve 512 to lock and complete the return operation.

[0171] S4. Reverse-locking and removing the insertion tube unit. When it is necessary to remove the reconnection insertion tube, the tube column can be rotated to release the reverse locking structure of the reconnection spring claw from the forward locking structure of the reconnection locking sleeve, thereby removing the insertion tube unit. When the reconnection device is equipped with an anti-rotation component, only the upper end of the reconnection center tube (e.g., Figure 6 The pipe column (closer to the direction of arrow β) does not need to be rotated, and the reconnection center pipe can be removed along with the pipe column when the reconnection pipe column is removed.

[0172] According to the embodiments of this disclosure, a reconnection locking sleeve is used to replace the original hydraulic anchor reconnection anchoring device to fix the reconnection connection pipe, and the dynamic seal is changed to a static seal, which can improve the overall airtightness of the pipe string. When the reconnection pipe string is pulled out by inverting, the reconnection center pipe does not rotate with the pipe string, which greatly reduces the friction of the pipe string and makes it easier to pull out the pipe string.

[0173] According to the embodiments of this disclosure, only the upper end of the reconnecting center tube needs to be rotated, and the reconnecting center tube does not need to be rotated with it. This can prevent the reconnecting center tube from needing to be rotated when the tube is rotated for backing, which would increase the friction of the tube and make it difficult to remove the tube.

[0174] According to embodiments of this disclosure, it is possible to prevent the retraction sleeve and the retraction pawl from locking together when it is not desired that a lock be formed between them.

[0175] According to the embodiments of this disclosure, by dropping a setting ball into the suspended packer, setting can be achieved only for the suspended packer, which is independent and can be set independently within the open hole section tubing of a horizontal well, so that the functions of other tools in the open hole section completion tubing are not affected. Depending on the process requirements, the ball can also be dropped into the setting ball seat at the bottom of the tool tubing to achieve linkage setting of the suspended packer and the open hole packer, which improves the flexibility of the construction process.

[0176] According to the embodiments of this disclosure, without changing the release principle of hydraulic or mechanical reverse coupling, the pressure regulating valve can be eliminated and a release force-adding device can be added. This can achieve multiple release methods and improve the compressive strength of the tubing string, enabling the tubing string to achieve an overall compressive strength of over 70MPa, so that it can operate without restriction in deep wells with a high proportion of kill fluid.

[0177] According to the embodiments of this disclosure, if the tubing gets stuck unexpectedly during the insertion process, the unsealing device can be activated to lift the tubing and unseal it.

[0178] Although the present disclosure has been described above in conjunction with exemplary embodiments and accompanying drawings, those skilled in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A tieback device for a completion-integrated packer, comprising: The back-connection device comprises: a lock sleeve unit formed on the hanging completion integrated packer, the lock sleeve unit comprising: a back-connection cylinder; and a back-connection lock sleeve, the second end of the back-connection lock sleeve being connected with the first end of the back-connection cylinder, and the inner wall of the back-connection lock sleeve being provided with a forward locking structure; a pipe inserting unit for being inserted into the back-connection cylinder and being locked with the back-connection lock sleeve during back-connection operation, the pipe inserting unit comprising: a back-connection connecting pipe, the first end of the back-connection connecting pipe being used for being connected with a tubing; a back-connection central pipe, the first end of the back-connection central pipe being coaxially and sealingly matched with the second end of the back-connection connecting pipe, and the outer wall of the second end of the back-connection central pipe being provided with a sealing assembly to form an axial seal between the inner wall of the back-connection cylinder; a back-connection pawl, the back-connection pawl being sleeved on the outer wall of the back-connection connecting pipe, the outer wall of the back-connection pawl being formed with a reverse locking structure, the reverse locking structure being capable of cooperating with the forward locking structure to form a lock; and a back-connection pressure cap, the back-connection pressure cap being sleeved and connected on the outer wall of the back-connection connecting pipe, the second end of the back-connection pressure cap abutting against the first end of the back-connection pawl.

2. The tieback device of claim 1, wherein, The inner wall of the second end of the back-connection connecting pipe is sequentially formed with a first annular step and a second annular step, the first end of the back-connection central pipe is coaxially and sealingly matched with the back-connection connecting pipe at the first annular step, and the second annular step of the back-connection connecting pipe forms a one-way opening first annular cavity with the back-connection central pipe.

3. The tieback device of claim 2, wherein, The back-connection device further comprises: a bearing cap, the first end of the bearing cap being inserted into the first annular cavity, the outer side wall of the first end of the bearing cap being coaxially connected with the second annular step of the back-connection connecting pipe, the second end of the bearing cap protruding radially outward to block the opening of the first annular cavity and support on the bottom surface of the back-connection connecting pipe and the back-connection pawl, and the inner side wall of the first end of the bearing cap forming a second annular cavity with the back-connection central pipe; and a clamping ring, the clamping ring being composed of two semicircles and being arranged in the second annular cavity, the clamping ring being coaxially matched with the central pipe and the bearing cap.

4. The tieback device of claim 1, wherein, The outer wall of the second end of the back-connection connecting pipe is uniformly provided with a plurality of axial shoulders, the second end of the back-connection pawl is uniformly provided with a plurality of split pawls, and the axial shoulders and the split pawls are cross-matched to limit the circumferential rotation of the back-connection pawl.

5. The tieback device of claim 1, wherein, The back-connection device further comprises: a protection assembly, the protection assembly being arranged to prevent the back-connection lock sleeve and the back-connection pawl from being locked when it is not expected that the back-connection lock sleeve and the back-connection pawl are locked, the protection assembly comprising: a protection sleeve, the protection sleeve being sleeved on the outer wall of the back-connection connecting pipe and extending to the second end of the back-connection connecting pipe, the protection sleeve being capable of covering the reverse locking structure and forming a third annular cavity with the back-connection connecting pipe, the third annular cavity having an opening towards the second end of the back-connection connecting pipe; and a back-connection shearing fixing member, the back-connection shearing fixing member relatively fixing the protection sleeve and the back-connection connecting pipe, and being capable of being sheared under the action of a first axial shearing force.

6. The tieback device of claim 5, wherein, The outer wall of the back-connection connecting pipe is sequentially formed with a fourth annular step, a fifth annular step and a third annular step from top to bottom, the outer diameter of the fourth annular step is < the outer diameter of the fifth annular step < the outer diameter of the third annular step, wherein the back-connection pawl is arranged at the third annular step, and the inner wall of the first end of the back-connection pawl is provided with an annular flange, the third annular step and the annular flange can limit the axial sliding of the back-connection pawl; the protection sleeve is fixed on the fourth annular step through a back-connection shearing fixing member; and the back-connection pressure cap is connected to the fifth annular step through screw threads.

7. A hanger completion integrated packer characterized by, The suspended completion integrated packer comprises the back-connection device according to any one of claims 1 to 6.

8. The hanger completion integrated packer of claim 7, wherein, The suspended completion integrated packer further comprises at least one of a setting mechanism, a releasing mechanism, a hanging mechanism and an unsealing mechanism, wherein The setting mechanism comprises: a setting central pipe, a first end of the setting central pipe is used for being connected with a drill pipe, a pipe wall of the setting central pipe close to the first end is formed with a first through hole penetrating the pipe wall; a setting assembly arranged to block the inner cavity of the setting central pipe at a setting position close to a second end of the setting central pipe; a first setting cylinder sleeve, the first setting cylinder sleeve is sleeved on the outer wall of the setting central pipe, and a first liquid inlet cavity with a one-way opening is formed between the first setting cylinder sleeve and the setting central pipe, the first liquid inlet cavity is communicated with the first through hole; and a first annular setting piston, the first annular setting piston is arranged in the first liquid inlet cavity and seals the opening of the first liquid inlet cavity, a part of the first annular setting piston extends radially outward to be clamped between the second end of the first setting cylinder sleeve and the back-connection cylinder; the first end of the back-connection cylinder abuts against the first annular setting piston; The hanging mechanism comprises: a hanging central pipe, a first end of the hanging central pipe is connected with the second end of the setting central pipe through the releasing mechanism; a thrust sleeve, the thrust sleeve is sleeved on the outer wall of the hanging central pipe, and a first end of the thrust sleeve abuts against a second end of the back-connection cylinder; a starting shearing fixing member, the starting shearing fixing member relatively fixes the thrust sleeve and the hanging central pipe, and can be sheared under the action of a second axial shearing force; and a hanging sealing assembly, the hanging sealing assembly is connected to a second end of the thrust sleeve and can move to a hanging position under the thrust of the thrust sleeve, so that the hanging sealing assembly is fixed on the inner wall of the casing and forms a seal with the inner wall of the casing; The releasing mechanism comprises: a releasing latch pipe, the inner wall of a first end of the releasing latch pipe is axially sealed with the inner wall of the back-connection cylinder, and a second end of the releasing latch pipe is provided with uniformly distributed pawls; a releasing lock head, the releasing lock head is formed on the inner wall of the releasing latch pipe, and a first end of the releasing lock head is axially sealed with the releasing latch pipe; a releasing shearing fixing member, the releasing shearing fixing member relatively fixes the releasing lock head and the releasing latch pipe, and can be sheared under the action of a fourth axial shearing force. a center collar, an outer wall of the center collar forms a shaft seal with an inner wall of the second end of the back-off sleeve, a first end of the center collar is coaxially connected with the drop-out latch pipe, and a second end of the center collar abuts against the setting center pipe; and a drop-out assembly configured to block an inner cavity of the drop-out latch head near an inner wall of a first end of the drop-out latch head; a first end of the unblocking mechanism is connected with the setting mechanism for unblocking the packer, and the unblocking mechanism comprises: an unblocking sleeve, a first end of the unblocking sleeve abuts against a second end of the setting center pipe; an unblocking latch, the unblocking latch is sleeved on an outer wall of the unblocking sleeve, a first end of the unblocking latch is axially and sealingly connected with the second end of the setting center pipe, and a second end of the unblocking latch is provided with a plurality of uniformly distributed latches; an unblocking shearing fixing member, the unblocking shearing fixing member relatively fixes the unblocking sleeve and the unblocking latch and can be sheared under the action of a seventh axial shearing force; and an unblocking assembly configured to block an inner cavity of the unblocking sleeve near the unblocking sleeve.

9. A completion string, characterized by The completion string comprises the suspension completion integrated packer according to claim 7 or 8.

10. A tieback process employing the tieback device of any one of claims 1 to 6, characterized in that, The back-off process comprises the steps of: lowering a tubing load to insert the insertion pipe unit into the back-off sleeve for trial back-off; measuring a length of the depth-adjusting tubing required for wellhead when trial back-off is performed, and connecting the length of the depth-adjusting tubing at the wellhead; lowering the insertion pipe unit to make the back-off latch cooperate with the back-off latch sleeve to form locking, and complete back-off operation; rotating the string to make the reverse locking structure of the back-off latch and the positive locking structure of the back-off latch sleeve be unlocked, and the insertion pipe unit is pulled out.

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