A tool for opening a completion sliding sleeve

Abstract

The application provides an opening tool for a completion sliding sleeve, comprising: a hooking mechanism, which comprises a cylindrical body part and a spring plate formed on the upper end of the body part; a sealing mechanism, which comprises a central rod arranged in the hooking mechanism and a setting device connected to the lower end of the body part; wherein the central rod is concentrically arranged in the interior of the hooking mechanism through a sleeve, the sleeve comprises a first cylinder and a second cylinder, the upper end part of the central rod is installed in the first cylinder, and a ball seat is installed in the second cylinder; in a first state, the opening tool can be lowered into a wellbore to a target sliding sleeve, and a hooking is formed by adapting the spring plate with the inner cylinder of the target sliding sleeve; in a second state, the ball seat can be pushed downward by ball pressure, and then the central rod is axially moved downward, so that the setting device completes setting to seal the completion sliding sleeve; in the second state, the opening tool can open the target sliding sleeve by continuing to press the inner cylinder of the target sliding sleeve downward.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas drilling and completion and reservoir transformation, and particularly relates to an opening tool for a completion sliding sleeve. Background Art

[0002] The sliding sleeve is a core downhole tool used in well completion operations. During use, the fracturing holes on the sleeve are typically opened by using a ball or other opening tool to build up pressure, and then the oil and gas well is fractured.

[0003] In recent years, a variety of opening tools have emerged to meet the requirements for more horizontal well segments. For example, by clamping the opening tool into the groove of the sleeve and applying pressure to the opening tool, the opening tool is pushed and moved, ultimately pushing the sleeve to move and open the fracturing hole. Although the use of an opening tool to open the sleeve can meet the requirements of a large number of sleeve segments, the gap between the existing opening tool and the sleeve is small. If there is deformation of the tubing, such as deformation of the casing in a shale gas well, the existing opening tool may not be able to successfully pass the deformation point of the tubing to open the sleeve, posing a risk of losing the production layer.

[0004] While existing measures such as small bridge plugs or small tubing strings are available to address tubing deformation in wells, small bridge plugs carry the risk of becoming stuck or set inside the sleeve, while small tubing strings are limited in flow rate and expensive. Furthermore, existing opening tools have a low success rate. Summary of the Invention

[0005] In response to the technical problems mentioned above, the present invention aims to propose an opening tool for a completion sleeve, which can effectively improve the passability between the opening tool and the sleeve, can smoothly pass through the deformation point of the tubing string to open the target sleeve, and can ensure that the space inside the pipe is smoothly sealed after passing through, thereby improving the reliability of the sealing.

[0006] To this end, the application provides an opening tool for a completion sliding sleeve, comprising: a catch mechanism, the catch mechanism comprising a cylindrical body portion and a spring plate formed on the upper end of the body portion; a pack-off mechanism, the pack-off mechanism comprising a central rod arranged in the catch mechanism and a setting device connected to the lower end of the body portion; wherein the central rod is concentrically arranged inside the catch mechanism through a sleeve, the sleeve comprising a first cylinder and a second cylinder connected to the upper end of the first cylinder, the upper end portion of the central rod is installed in the first cylinder, and a ball seat is installed in the second cylinder; in a first state, the opening tool can be lowered into the wellbore to the target sliding sleeve and form a catch by adapting the spring plate with the inner cylinder of the target sliding sleeve; in a second state, the ball seat can be pushed downward by ball pressure blocking, and in turn the central rod is axially moved downward, so that the setting device completes setting to seal the completion sliding sleeve, and in the second state, the opening tool can open the target sliding sleeve by continuing to press the inner cylinder of the target sliding sleeve downward.

[0007] In one embodiment, the opening tool is made of soluble material, and the opening tool can be dissolved by injecting a dissolving liquid or well flowback fluid after fracturing operation, so as to realize the unobstructed wellbore.

[0008] In one embodiment, the setting device comprises a setting seat fixedly connected to the lower end of the central rod, a guide head fixedly connected to the body portion, and a sealing rubber sleeve sleeved on the guide head, the setting seat is fixedly connected to the body portion through a first shear pin, the central rod can be moved downward to push the setting seat, so that the setting seat axially presses the sealing rubber sleeve, and the sealing rubber sleeve expands radially to seal the completion sliding sleeve.

[0009] In one embodiment, the guide head and the body portion are fixedly connected through a positioning pin, a long slot extending in the axial direction is arranged on the side wall of the setting seat,

[0010] the positioning pin passes through the long slot, the positioning pin can move along the long slot, so that the setting seat can move axially relative to the guide head to axially compress the sealing rubber sleeve.

[0011] In one embodiment, the first cylinder and the body portion are fixedly connected through a first locking pin.

[0012] In one embodiment, the central rod is configured as a stepped shaft, and the upper end portion of the central rod is installed in the sleeve, and the lower end portion of the central rod is installed in the setting seat.

[0013] In one embodiment, a ratchet is arranged on the outer circumferential surface of the central rod, and a ratchet sleeve is arranged on the inner wall of the body part, the ratchet being adapted to engage with the ratchet sleeve during downward movement of the central rod and form a lock, thereby locking the setting state of the sealing rubber sleeve.

[0014] In one embodiment, the hooking mechanism is provided with a plurality of the elastic pieces, and the plurality of the elastic pieces are uniformly distributed in the circumferential direction.

[0015] In one embodiment, the ball seat is fixedly connected with a first locking block through a second locking pin, the ball seat being capable of driving the first locking block to move downward so that the first locking block enters the radial inner side of the corresponding elastic piece, thereby locking the hooking between the elastic piece and the inner cylinder of the target sliding sleeve.

[0016] In one embodiment, a releasing joint is connected to the upper end of the second cylinder, the ball seat being fixedly connected with the releasing joint through a second shearing pin in the initial state, the ball seat being capable of shearing the second shearing pin under the effect of pressure.

[0017] In one embodiment, the lower end of the releasing joint is configured as a stepped connecting buckle, the second cylinder being adapted to be connected with the stepped connecting buckle, the second shearing pin penetrating through the stepped connecting buckle, and the axial inner end of the second shearing pin being fixedly connected with the ball seat, and the axial outer end being fixedly connected with the second cylinder, the second shearing pin being sheared at the axial outer end by lifting the releasing joint, thereby releasing the hand.

[0018] In one embodiment, the lower end of the releasing joint is configured with an elastic claw, the end of the elastic claw being provided with a radial outward protrusion, an inner sleeve being fixedly connected with the releasing joint in the second cylinder, and an annular groove being arranged on the outer surface of the ball seat, the protrusion of the elastic claw being in the lower end of the inner sleeve and forming a lock in the initial state, the ball seat being capable of moving downward to make the annular groove correspondingly enter the inner side of the elastic claw, and the releasing joint being capable of being lifted to make the elastic claw contract inward to make the protrusion escape, or make the protrusion drive the inner sleeve to shear the releasing pin, thereby releasing the hand.

[0019] Compared with the prior art, the application has the following advantages:

[0020] The opening tool for completion sliding sleeve according to the present application can effectively improve the passability between the opening tool and the sliding sleeve, and the opening tool has small volume, which ensures that the opening tool can smoothly pass through the deformation point of the pipe string and then open the target sliding sleeve. The elastic sheet has retractability and can be completely retracted in the size of the tool body, which further ensures that the opening tool can smoothly pass through the deformation point of the pipe string and avoids the situation of losing the section. The opening tool can ensure smooth sealing of the inner space of the pipe through the setting mechanism after passing through, improve the setting reliability, and thus ensure smooth fracturing construction, which is very beneficial to improve the operation success rate of the pipe string deformation well. In addition, the opening tool has simple structure, convenient operation, high setting reliability, and high release success rate. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be described below with reference to the drawings.

[0022] Figure 1 The structure of the opening tool for completion sliding sleeve according to embodiment one of the present application is shown.

[0023] Figure 2 The structure of the sleeve in the opening tool is shown schematically. Figure 1

[0024] Figure 3 is a sectional view along the center line B-B. Figure 1

[0025] Figure 4 is a sectional view along the center line A-A. Figure 1

[0026] Figure 5 The setting state of the opening tool of embodiment one is shown.

[0027] Figure 6 The release state of the opening tool of embodiment one is shown.

[0028] Figure 7 The structure of the opening tool for completion sliding sleeve according to embodiment two of the present application is shown.

[0029] Figure 8 The setting state of the opening tool of embodiment two is shown.

[0030] Figure 9 One release state of the opening tool of embodiment two is shown.

[0031] Figure 10 Another release state of the opening tool of embodiment two is shown.

[0032] In the present application, all the drawings are schematic drawings and are only used to illustrate the principles of the present application, and are not drawn according to the actual proportions. DETAILED DESCRIPTION ​​​

[0033] The present invention will be described below with reference to the accompanying drawings.

[0034] In the present application, it should be noted that the end of the opening tool for completion sleeve according to the present invention lowered into the wellbore close to the wellhead is defined as the upper end, and the end away from the wellhead is defined as the lower end.

[0035] Figure 1 FIG. 1 shows the structure of an opening tool 100 for a completion sleeve according to the present invention. Figure 1 As shown, the opening tool 100 includes a latching mechanism 1, a sealing mechanism, and a ball seat 5 disposed within the opening tool 100. The opening tool 100 can be delivered into the wellbore via coiled tubing to a target sleeve (not shown). The latching mechanism 1 engages with the inner barrel of the target sleeve to form a latch. By injecting a ball and building up pressure, the ball seat is pushed downward, thereby driving the sealing mechanism to seal the completion sleeve. Continued pressure is applied to the opening tool 100, driving the inner barrel of the target sleeve downward to open the target sleeve, thereby opening the fracturing hole in the completion sleeve and enabling fracturing operations.

[0036] According to the present invention, the opening tool 100 is made of a soluble material. After the construction is completed, the opening tool 100 can be dissolved by injecting a dissolving liquid, or the opening tool 100 can be slowly dissolved by the return fluid in the well, thereby achieving unblocking the wellbore.

[0037] like Figure 1 As shown, the hook mechanism 1 includes a main body 12 and a spring 13 formed at the upper end of the main body 12. The main body 12 is configured in a cylindrical shape. Figure 3 As shown, the hooking mechanism 1 is provided with a plurality of elastic pieces 13 , and the plurality of elastic pieces 13 are evenly distributed in the circumferential direction.

[0038] In this embodiment, the latching mechanism 1 forms the outer shell of the opener 100, and the maximum outer diameter of the spring clip 13 is the same as the maximum outer diameter of the opener. This structure of the latching mechanism 1 meets the demand for a compact design, ensuring that the opener can successfully pass through the deformation point of the tubular string and open the target sleeve. Because the opener 100 is relatively small and the spring clip 13 is retractable, it can be completely retracted within the tool body. This ensures that the opener 100 can successfully pass through the deformation point of the tubular string, preventing segment loss.

[0039] like Figure 1 As shown, a protrusion is provided on the outer surface of the elastic piece 13. The elastic piece 13 can be adapted to the hooking groove in the inner cylinder of the target sliding sleeve through the protrusion to form a hook with the inner cylinder of the target sliding sleeve.

[0040] According to the present invention, the isolation mechanism includes a central rod 3 arranged in the hanging mechanism 1 and a setting device 4 connected to the lower end of the body portion 12 of the hanging mechanism 1 .

[0041] As shown in Figure 1 , the setting device 4 comprises a setting seat 41 fixedly connected to the lower end of the center rod 3, a guide head 42 fixedly connected to the body part 12 of the hanger mechanism 1, and a sealing rubber sleeve 43 sleeved on the guide head 42. The setting seat 41 is fixedly connected to the body part 12 through a first shear pin 44. The center rod 3 can be axially moved downward to push the setting seat 42, so that the setting seat 41 axially presses the sealing rubber sleeve 43, and the sealing rubber sleeve 43 is radially expanded to seal the well completion sliding sleeve.

[0042] According to the present application, the center rod 3 is concentrically arranged inside the hanger mechanism 1 through the sleeve 2, and can be axially moved along the sleeve 2. As shown in Figure 2 , the sleeve 2 comprises a first cylinder 22 and a second cylinder 23 fixedly connected to the upper end of the first cylinder 22, and the diameter of the second cylinder 23 is larger than that of the first cylinder 22. The upper end part of the center rod 3 is installed in the first cylinder 22, and the ball seat 5 is installed in the second cylinder 23. The lower end part of the second cylinder 23 is sleeved on the outer peripheral surface of the first cylinder 22 and is fixedly connected to the first cylinder 22, and the upper end part of the second cylinder 23 extends upward by a part, and the inner diameter of the upper end part is larger than that of the lower end part. The second cylinder 23 is provided with a plurality of through grooves extending in the axial direction and uniformly distributed in the circumferential direction, so that the second cylinder 23 is formed into a multi-petal structure. The lower end of the first cylinder 22 of the sleeve 2 is fixedly connected to the body part 12 through the first locking pin 21. The center rod 3 is configured as a stepped shaft, and the upper end part of the center rod 3 is installed in the first cylinder 22, and the lower end part of the center rod 3 is installed in the setting seat 41.

[0043] As shown in Figure 1 , the guide head 42 is fixedly connected to the body part 12 of the hanger mechanism 1 through a positioning pin 45. The outer wall of the guide head 42 is provided with a mounting step with an end face upward, and the lower end of the sealing rubber sleeve 43 abuts against the mounting step. The lower end part of the setting seat 41 is installed between the radial direction of the guide head 42 and the body part 12 of the hanger mechanism 1, and the upper end of the sealing rubber sleeve 43 is in contact with the lower end face of the setting seat 41. A long groove 411 extending in the axial direction is arranged on the side wall of the setting seat 41, and the positioning pin 45 passes through the long groove 411, and the positioning pin 45 can move along the long groove 411, so that the setting seat 41 can be axially moved relative to the guide head 42 to axially compress the sealing rubber sleeve 43.

[0044] According to the application, the ratchet teeth 61 are arranged on the outer circumferential surface of the central rod 3, and the ratchet teeth sleeve 62 is arranged on the inner wall of the body part 12 of the clamping mechanism 1. The ratchet teeth 61 can be engaged with the ratchet teeth sleeve 62 during the downward movement of the central rod 3 and locked, preventing the central rod 3 from retracting, thereby axially locking the setting seat 41 to lock the setting state of the sealing rubber sleeve 43. Thus, after the sealing rubber sleeve 43 is set, the target sliding sleeve can be kept in the sealed state during the fracturing operation, improving the reliability of the sliding sleeve setting and sealing, and effectively ensuring the smooth progress of the fracturing operation.

[0045] In an embodiment not shown, the central rod 3 can be a hollow rod, and the guide head can also be configured in a hollow structure. In this way, after the dissolving liquid is injected, the dissolving liquid can enter the central rod and the guide head to increase the contact area of the dissolving liquid with the central rod 3 and the guide head 42, thereby uniformly, more quickly and completely dissolving the opening tool, avoiding the problem that incomplete dissolution of the central rod 3 or the guide head 42 affects the later fracturing operation.

[0046] According to the application, the ball seat 5 is installed in the second cylinder 23. As shown in Figure 1 , the ball seat 5 is fixedly connected with the first locking block 7 by the second locking pin 51. In actual work, when the opening tool is lowered to the target sliding sleeve and clamped with the inner cylinder of the target sliding sleeve, the ball pushes the ball seat 5 downward by ball pressure. The downward movement of the ball seat 5 can drive the first locking block 7 to move downward, and the first locking block 7 can enter the radial inner side of the corresponding spring piece 13, thereby radially supporting the spring piece 13 to lock the clamping between the spring piece 13 and the inner cylinder of the target sliding sleeve. This can effectively prevent the spring piece 13 from being pulled out, significantly improving the reliability of opening the fracturing hole of the target sliding sleeve.

[0047] As shown in Figure 4 , a plurality of first locking blocks 7 are arranged, and the plurality of first locking blocks 7 are uniformly distributed in the circumferential direction. The first locking block 7 is initially arranged in the through slot of the side wall of the second cylinder 23, and is axially opposite to the spring piece 13. This can enable the first locking block 7 to accurately move to the radial inner side of the corresponding spring piece 13, and can effectively radially support the spring piece 13.

[0048] According to the application, the second cylinder 23 is connected with the releasing joint 8 at the upper end. The ball seat is fixedly connected with the releasing joint 8 by the second shear pin 9 in the initial state, and the ball seat 5 can move downward after the second shear pin 9 is sheared under the pressure. The releasing joint 8 will be described below according to different embodiments.

[0049] In an embodiment, as shown in Figure 1As shown, the lower end of the releasing sub 8 is configured as a stepped connection buckle, and the second cylinder 23 is connected with the stepped connection buckle. The second shear pin 9 penetrates the stepped connection buckle, and the axial inner end of the second shear pin 9 is fixedly connected with the ball seat 5, and the axial outer end of the second shear pin 9 is fixedly connected with the second cylinder 23. Thus, the connection between the releasing sub 8 and the opening tool 100 is realized. Before the fracturing operation, the coiled tubing (not shown) connected with the upper end of the releasing sub 8 can drive the releasing sub 8 to shear the axial outer end of the second shear pin 9, so as to realize the releasing.

[0050] In one embodiment, in order to avoid the ball seat 5 from shearing the second shear pin 9 in advance, a second locking block 71 is arranged at the lower end of the releasing sub 8. An annular groove is arranged on the outer circumferential surface of the ball seat 5. A stepped surface with an upward end face is arranged on the inner wall of the second cylinder 23, and a part of the lower end face of the second locking block 71 is arranged on the stepped surface, and a part of the lower end face of the second locking block 71 is in contact with the upward side wall of the annular groove on the ball seat 5. The upper end of the second locking block 71 is in contact with the lower end face of the releasing sub 8. Thus, the ball seat 5 is limited in the axial upward direction.

[0051] In order to ensure the sealing between the connection surface of the releasing sub 8 and the ball seat 5, a sealing member can be arranged between the contact surface of the releasing sub 8 and the ball seat 5. The sealing member can be a sealing ring, for example. In this way, the sealing between the ball seat 5 and the releasing sub 8 can be effectively ensured, so as to effectively ensure the sealing of the upper part of the ball seat 5 during the ball pressure holding, so as to ensure the reliability of the pressure holding.

[0052] In the specific construction process, first, the opening tool 100 is sent into the wellbore through the coiled tubing, and the opening tool reaches the target sliding sleeve, and then the elastic sheet 13 is adaptively clamped with the inner cylinder of the target sliding sleeve. As shown in the figure, at this time, the opening tool 100 is in the first state (initial state). Figure 1

[0053] After the opening tool 100 is clamped, the pressure is continuously increased, so that the holding ball applies a downward movement force to the ball seat 5 until the axial inner end of the second shear pin 9 is sheared, and then the ball seat 5 is pushed downward, the ball seat 5 continues to hold pressure to push the center rod 3 downward, the center rod 3 pushes the setting seat 41 to axially compress the sealing rubber cylinder 43, so that the sealing rubber cylinder 43 is radially expanded until the sealing rubber cylinder 43 and the inner cylinder of the target sliding sleeve are sealed, thereby the setting mechanism completes the setting, and the target sliding sleeve is isolated. As shown in the figure, at this time, the opening tool 100 is in the second state (setting state). Figure 5

[0054] ​​In the second state, the first locking block 7 follows the ball seat downward and enters the radially inner side of the corresponding spring plate 13, providing radial support for the spring plate 13 and thereby locking the spring plate 13 and the inner tube of the target sleeve. Furthermore, in this state, the ratchet teeth 61 on the center rod 3 engage with the ratchet sleeve 62 within the main body 12 to form a lock, thereby locking the sealing rubber sleeve 43 in the set state. This ensures that after the sealing rubber sleeve 43 is set, the target sleeve is always sealed during the fracturing operation, ensuring smooth fracturing operation.

[0055] Afterwards, the coiled tubing connected to the upper end of the release joint 8 is lifted up to drive the release joint 8 to shear the axial outer end of the second shear pin 9, thereby achieving release. Figure 6 As shown, at this moment, the opening tool 100 is in the state of being released. At this moment, the coiled tubing can be pulled out.

[0056] After the release is complete, continued pressure is applied, allowing the entire opening tool 100 to drive the inner barrel of the target sleeve downward through the locking mechanism, thereby opening the fracturing hole in the target sleeve. This allows fracturing operations to proceed. After the fracturing operation is completed, the opening tool 100 can be dissolved by injecting a dissolving solution, or it can be slowly dissolved by return fluid from the well, thereby clearing the wellbore.

[0057] In another embodiment, Figure 6 As shown, the lower end of the release connector 8' is constructed with an elastic claw 81. The end of the elastic claw 81 is provided with a radially outward projection. An inner sleeve 83 is fixedly connected within the second cylinder 23' via a release pin 82. An annular groove is provided on the outer surface of the ball seat 5'. Initially, the projection of the elastic claw 81 is located at the lower end of the inner sleeve 83, locked in place by the radial support of the ball seat 5'. After the ball seat 5' descends until the annular groove is radially inward of the elastic claw 81, the coiled tubing connected to the upper end of the release connector 8' is lifted to drive the release connector 8' upward, causing the elastic claw 81 to retract into the annular groove and disengage the projection, thereby releasing the release. If the elastic claw 81 fails to disengage, the release connector 8' can be lifted again, causing the projection to drive the inner sleeve 83 to shear the release pin 82, thereby releasing the release. This release structure improves the release success rate and reliability.

[0058] To ensure a tight seal between the release connector 8' and the ball seat 5', a seal can be provided between the contact surfaces of the release connector 8' and the ball seat 5'. A seal can also be provided between the contact surfaces of the ball seat 5' and the second cylinder 23'. For example, the seal can be a sealing ring. This effectively ensures a tight seal between the ball seat 5' and the release connector 8', thereby effectively sealing the upper portion of the ball seat 5' during ball delivery and pressure holding, ensuring reliable pressure holding.

[0059] In the specific construction process, first, the opening tool 100' is sent into the wellbore through the coiled tubing, and the opening tool reaches the target sliding sleeve, and then the elastic sheet 13' is matched and hung with the inner cylinder of the target sliding sleeve. As shown in the figure, at this time, the opening tool 100' is in the first state (initial state). Figure 7

[0060] After the opening tool 100' is hung, continue to pressurize, so that the pressure holding ball applies a downward movement force to the ball seat 5', until the axial inner end of the second shear pin 9' is sheared, and then the ball seat 5' is pushed downward, the ball seat 5' continues to hold pressure and pushes the center rod 3' downward, the center rod 3' pushes the setting seat 41' axially compresses the sealing rubber cylinder 43', so that the sealing rubber cylinder 43' expands radially, until the sealing rubber cylinder 43' and the inner cylinder of the target sliding sleeve form a seal, thereby the setting mechanism completes setting, and the target sliding sleeve is isolated. As shown in the figure, at this time, the opening tool 100' is in the second state (setting state). Figure 8

[0061] In the second state, the first locking block 7' descends with the ball seat to the radial inner side of the corresponding elastic sheet 13', thereby forming radial support to the elastic sheet 13', and thus locking the hanging between the elastic sheet 13' and the inner cylinder of the target sliding sleeve. And in this state, the ratchet 61' on the center rod 3' cooperates with the ratchet sleeve 62' in the body part 12' to form a lock, thereby locking the setting state of the sealing rubber cylinder 43'. Thus, after the sealing rubber cylinder 43' is set, the target sliding sleeve can be kept in the isolated state during the fracturing construction process, to ensure the smooth progress of the fracturing construction.

[0062] Then, the coiled tubing connected to the upper end of the release sub 8' is pulled up to drive the release sub 8' to move upward, so that the elastic claw 81 is retracted into the annular groove to make the protrusion out, thereby realizing the release. As shown in the figure, at this time, the elastic claw 81 is out, and the opening tool 100' is in the release state. In this state, the coiled tubing can be pulled out. Figure 9 In special cases, if the elastic claw 81 does not successfully out, the release sub 8' can be pulled up again to make the protrusion drive the inner sleeve 83 to shear the release pin 82, thereby realizing the release. As shown in the figure, at this time, the elastic claw 81 drives the inner sleeve 83 to shear the release pin 82, and the opening tool 100' is in the release state. In this state, the coiled tubing can be pulled out.

[0063] Figure 10

[0064] ​​​​The opening tool 100 for the completion sliding sleeve according to the present application can effectively improve the passability between the opening tool 100 and the sliding sleeve, the opening tool 100 has a small volume, and the opening tool 100 can be ensured to smoothly pass through the pipe string deformation point and open the target sliding sleeve. The elastic sheet 13 has a collapsibility and can be completely retracted in the size of the tool body, which further ensures that the opening tool 100 can smoothly pass through the pipe string deformation point and avoids the situation of losing the section. The opening tool 100 can ensure the smooth sealing of the inner space of the pipe through the setting mechanism after passing through, improve the setting reliability, and thus ensure the smooth fracturing construction, which is very beneficial to improve the operation success rate of the pipe string deformation well. In addition, the opening tool 100 has a simple structure, convenient operation, high setting reliability, and high release success rate.

[0065] Finally, it should be noted that the above only describes the preferred embodiments of the present application and does not constitute any limitation on the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or replace some technical features with equivalent ones. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An opening tool for completion sliding sleeve, comprising: a catch mechanism (1) comprising a cylindrical body portion (12) and a spring blade (13) formed on the upper end of the body portion; a packing mechanism comprising a central rod (3) arranged in the catch mechanism and a setting device (4) connected to the lower end of the body portion; wherein the central rod is concentrically arranged inside the catch mechanism through a sleeve (2), the sleeve comprising a first cylinder (22) and a second cylinder (23) connected to the upper end of the first cylinder, the upper end portion of the central rod is installed in the first cylinder, and a ball seat (5) is installed in the second cylinder; in a first state, the opening tool can be lowered into the wellbore to the target sliding sleeve and form a catch by adapting the spring blade with the inner cylinder of the target sliding sleeve; in a second state, the ball seat can be pushed downward by ball pressure build-up, thereby pushing the central rod to move axially downward, so that the setting device completes setting to pack off the completion sliding sleeve, in the second state, the opening tool can open the target sliding sleeve by continuing to press the inner cylinder of the target sliding sleeve downward, the ball seat is fixedly connected with a first locking block (7) through a second locking pin (51), the ball seat can drive the first locking block to move downward so that the first locking block enters the radial inner side of the corresponding spring blade, thereby locking the catch between the spring blade and the inner cylinder of the target sliding sleeve.

2. The opening tool of claim 1, wherein The opening tool is made of soluble material, and the opening tool can be dissolved by injecting a dissolving solution or well flowback fluid after fracturing operation, thereby realizing the smoothness of the wellbore.

3. An opening tool according to claim 1 or 2, characterized in that The setting device comprises a setting seat (41) fixedly connected to the lower end of the central rod, a guide head (42) fixedly connected with the body portion, and a sealing rubber cylinder (43) sleeved on the guide head, the setting seat is fixedly connected with the body portion through a first shear pin (44), the central rod can push the setting seat to axially extrude the sealing rubber cylinder, so that the sealing rubber cylinder expands radially to pack off the completion sliding sleeve.

4. The opening tool of claim 3, wherein The guide head and the body portion are fixedly connected through a positioning pin (45), a long slot (411) extending in the axial direction is provided on the side wall of the setting seat, the positioning pin passes through the long slot, and the positioning pin can move along the long slot, so that the setting seat can move axially relative to the guide head to axially compress the sealing rubber cylinder.

5. The opening tool of claim 3, wherein The first cylinder and the body portion are fixedly connected through a first locking pin (21).

6. The opening tool of claim 5, wherein The central rod is configured as a stepped shaft, and the upper end portion of the central rod is installed in the sleeve, and the lower end portion is installed in the setting seat.

7. The opening tool of claim 3, wherein A ratchet (61) is provided on the outer peripheral surface of the central rod, and a ratchet sleeve (62) is provided on the inner wall of the body portion, the ratchet can be engaged and locked with the ratchet sleeve during the downward movement of the central rod, thereby locking the setting state of the sealing rubber cylinder.

8. The opening tool of claim 1, wherein The catch mechanism is provided with a plurality of spring blades, and the plurality of spring blades are uniformly distributed in the circumferential direction.

9. The opening tool of claim 1, wherein A releasing joint (8) is connected to the upper end of the second cylinder, and the ball seat is fixedly connected with the releasing joint by a second shear pin (9) in an initial state, and the ball seat can shear the second shear pin under pressure.

10. The opening tool of claim 9, wherein The lower end of the releasing joint is configured as a stepped connection buckle, the second cylinder is adaptively connected with the stepped connection buckle, the second shear pin penetrates through the stepped connection buckle, and the axial inner end of the second shear pin is fixedly connected with the ball seat, and the axial outer end is fixedly connected with the second cylinder, The axial outer end of the second shear pin can be sheared by lifting the releasing joint to realize releasing.

11. The opening tool of claim 9, wherein The lower end of the releasing joint is configured with a resilient claw (81), the end of the resilient claw is provided with a radially outward protrusion, an inner sleeve (83) is fixedly connected with the releasing joint by a releasing pin (82) in the second cylinder, and an annular groove is arranged on the outer surface of the ball seat, The protrusion of the resilient claw is located at the lower end of the inner sleeve and forms a lock in the initial state, and after the ball seat descends to the position where the annular groove is located on the inner side of the resilient claw, the releasing joint can be lifted to make the resilient claw contract inward to make the protrusion out of the inner sleeve, or the protrusion drives the inner sleeve to shear the releasing pin, so as to realize releasing.

Images