Expansion pipe releasing tool and expansion type drilling liner hanger

Abstract

The invention belongs to the technical field of well drilling, and discloses an expansion pipe releasing tool and an expansion type drilling liner hanger. A limiting pipe is inserted into the lower end of a sealing sleeve, and a first limiting step is arranged in the sealing sleeve; the central pipe is movably arranged in the sealing sleeve, and the supporting seat is located at the end of the central pipe and connected with the central pipe through a pin. The upper end of the pawl spring piece is in threaded connection with the center pipe, the lower end of the pawl spring piece abuts against the end of the limiting pipe, and the outer wall of the pawl spring piece is provided with a second limiting step. When the pawl spring piece is in the supporting state, the supporting base is inserted into the pawl spring piece and supports the pawl spring piece, and the second limiting step abuts against the first limiting step in a limiting mode. When the pawl spring piece is in the contraction state, the supporting base is separated from the pawl spring piece downwards, and the pawl spring piece can contract and be separated from the sealing sleeve. The expansion type drilling liner hanger comprises the expansion pipe releasing tool, when hydraulic releasing is not successful, mechanical releasing can be used for releasing, and the construction success rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of drilling, and in particular to an expansion tube release tool and an expansion type tail tube hanger. Background Art

[0002] The expandable tail pipe hanger expands the expansion pipe underground, so that the sealing suspension structure and the inner wall of the casing have an interference fit, thereby seamlessly connecting with the upper tail casing to build a complete wellbore and achieve reliable sealing and suspension performance. The expandable tail pipe hanger has a wide range of applications, and is particularly suitable for use in high-temperature thermal recovery wells, post-fracture wells, gas wells, water layer window wells and other fields, solving technical problems that are difficult to solve with conventional hangers. From an engineering perspective, it can improve the quality of cementing, reduce the problem of multiple well repairs due to obstructions during the entry of the bell mouth, and solve the problems of difficulty in sealing the tail pipe head and difficulty in operating through the window. From the perspective of economic benefits, the technology is mature, the process is simple, and the construction is reliable. It can reduce the comprehensive cost of later operations, extend the life cycle of oil and gas wells, and has high economic benefits.

[0003] In the prior art, the expandable liner hanger delivers the liner to the bottom of the well, and the delivery tool must be disconnected before expansion construction. At present, conventional expandable liner hangers use a single mechanical release structure or a hydraulic release structure, but during the construction process of the expansion tube tool, the release may fail unexpectedly, which may lead to complex situations such as drill sticking. Summary of the invention

[0004] The object of the present invention is to provide an expandable tube release tool and an expandable tail tube hanger, which can achieve release by mechanical and hydraulic methods. If the hydraulic release is unsuccessful, a spare auxiliary mechanical release can be used to release the tube, thereby improving the construction success rate and avoiding situations such as drill sticking.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Expansion tube release tool, including:

[0007] A sealing sleeve, wherein a limiting tube is inserted into the lower end of the sealing sleeve, and a first limiting step is arranged in the sealing sleeve;

[0008] A central tube, the central tube being movably disposed in the sealing sleeve;

[0009] A support seat, the support seat is located at the end of the central tube and is connected to the central tube through a pin;

[0010] A claw spring member, wherein the upper end of the claw spring member is threadedly connected to the central tube, the lower end of the claw spring member abuts against the end of the limiting tube, and the outer wall of the claw spring member has a second limiting step;

[0011] The claw spring component has a supporting state and a contracted state. When in the supporting state, the support seat is inserted into the claw spring component and supports the claw spring component so that the second limiting step and the first limiting step are in limiting abutment; when in the contracted state, the support seat is separated from the claw spring component downward so that the claw spring component can be contracted and separated from the sealing sleeve.

[0012] Preferably, the claw spring member includes a connecting portion and a clamping portion, the outer diameter of the clamping portion gradually decreases from the connecting portion to a direction away from the connecting portion, and the clamping portion is deformable; the end of the center tube is screwed into the connecting portion, and the second limiting step is located outside the clamping portion.

[0013] Preferably, a third limiting step is provided in the clamping portion, the third limiting step is in the same direction as the first limiting step, and a fourth limiting step is provided on the outer wall of the support seat, and when the third limiting step abuts against the fourth limiting step, the second limiting step abuts against the first limiting step.

[0014] Preferably, the second limiting step and the third limiting step are inclined steps.

[0015] Preferably, a fifth limiting step is provided in the limiting tube to limit the falling of the supporting seat.

[0016] Preferably, a first sealing member is provided between the support seat and the limiting tube.

[0017] Preferably, a second sealing member is provided between the limiting tube and the sealing sleeve.

[0018] An expandable tail pipe hanger is also provided, comprising:

[0019] An expansion tube throwing tool as described above;

[0020] An expansion pipe, one end of which is connected to the upper end of the sealing sleeve, and the central pipe is movable through the expansion pipe;

[0021] An expansion cone is located in the expansion tube and is sleeved on the central tube.

[0022] Preferably, the outer wall of the expansion tube is provided with a plurality of sealing connectors.

[0023] Preferably, a third sealing member is provided between the expansion tube and the sealing sleeve.

[0024] Beneficial effects of the present invention:

[0025] When the pressure injected into the center tube reaches a certain level, the pin between the center tube and the support seat breaks, and the pressure continues to increase, the support seat drops and escapes from the claw spring member. When the center tube is pulled upward, the first limiting step of the sealing sleeve squeezes the claw spring member, so that the claw spring member is converted from a supporting state to a contracted state, and the second limiting step can be separated from the first limiting step, and the center tube can be lifted up together with the claw spring member to complete the hydraulic release. After the pressure is injected into the center tube, the pressure does not break the pin, and the support seat cannot drop. At this time, the center tube can be rotated, and the center The screw connection between the tube and the claw spring part is loosened, and the center tube drives the support seat to separate from the claw spring part and move downward. When the support seat separates from the claw spring part, the center tube is pulled upward, and the first limiting step of the sealing sleeve squeezes the claw spring part, so that the claw spring part is converted from a supporting state to a contracted state. The second limiting step can separate from the first limiting step, and the center tube can be lifted up together with the claw spring part and the support seat to complete the mechanical release. Therefore, when the hydraulic release fails, a backup auxiliary mechanical release can be used to release the device, thereby improving the construction success rate and avoiding situations such as drill jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of an expandable liner hanger of the present invention;

[0027] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0028] In the figure:

[0029] 1. Sealing sleeve; 11. First limiting step; 2. Center tube; 3. Support seat; 4. Claw spring; 41. Connecting part; 42. Clamping part; 43. Third limiting step; 5. Limiting tube; 51. Fifth limiting step; 6. First sealing member; 7. Second sealing member; 8. Expansion tube; 9. Expansion cone; 10. Third sealing member; 20. Fourth sealing member; 30. Outer tube; 40. Sealing connector; 50. Pin. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] like Figure 1 and Figure 2 As shown, the present application provides an expansion tube release tool, which includes a sealing sleeve 1, a center tube 2, a support seat 3 and a claw spring member 4; wherein, the lower end of the sealing sleeve 1 is inserted with a limiting tube 5, and a first limiting step 11 is arranged in the sealing sleeve 1; the center tube 2 is movably arranged in the sealing sleeve 1, the support seat 3 is located at the end of the center tube 2, and is connected to the center tube 2 by a pin 50; the upper end of the claw spring member 4 is screwed with the center tube 2, and the lower end of the claw spring member 4 abuts the end of the limiting tube 5, and the outer wall of the claw spring member 4 has a second limiting step; the claw spring member 4 has a supporting state and a contracted state. When in the supporting state, the support seat 3 is inserted in the claw spring member 4 and supports the claw spring member 4 so that the second limiting step is limitedly abutted with the first limiting step 11; when in the contracted state, the support seat 3 is downwardly separated from the claw spring member 4, so that the claw spring member 4 can be contracted and separated from the sealing sleeve 1.

[0035] The support seat 3 is connected to the center tube 2 by setting the claw spring member 4, and a pin 50 is also connected between the center tube 2 and the support seat 3, the support seat 3 is located in the claw spring member 4, the first limiting step 11 is in limiting contact with the second limiting step, and the center tube 2 is limited to move upward; and when the injection pressure into the center tube 2 reaches a certain level, the pin 50 between the center tube 2 and the support seat 3 breaks, and the pressure continues to increase, the support seat 3 descends and escapes from the claw spring member 4, and when the center tube 2 is pulled upward, the first limiting step 11 of the sealing sleeve 1 squeezes the claw spring member 4, so that the claw spring member 4 is converted from a supporting state to a contracted state, the second limiting step can be separated from the first limiting step 11, and the center tube 2 can be lifted up together with the claw spring member 4, and the hydraulic release is completed; When pressure is injected into the center tube 2, the pressure does not break the pin 50, and the support seat 3 cannot descend. At this time, the center tube 2 can be rotated, and the threaded connection between the center tube 2 and the claw spring 4 is loosened. The center tube 2 drives the support seat 3 to separate from the claw spring 4 and move downward. When the support seat 3 separates from the claw spring 4, the center tube 2 is pulled upward, and the first limiting step 11 of the sealing sleeve 1 squeezes the claw spring 4, so that the claw spring 4 is converted from a supporting state to a contracted state. The second limiting step can be separated from the first limiting step 11, and the center tube 2 can be lifted up together with the claw spring 4 and the support seat 3 to complete the mechanical release. Therefore, when the hydraulic release fails, a backup auxiliary mechanical release can be used to release the device, thereby improving the construction success rate and avoiding situations such as drill jamming.

[0036] like Figure 1 and Figure 2 As shown, in this embodiment, the position limiting tube 5 is located in the sealing sleeve 1 and is threadedly connected to the sealing sleeve 1; and because the inner diameter of the position limiting tube 5 is smaller than that of the sealing sleeve 1, the lower end of the claw spring 4 can also abut against the end of the position limiting tube 5, so that when the mechanical hand release rotates the central tube 2, the position limiting tube 5 can be used to abut against the claw spring 4 to maintain its position, thereby preventing the claw spring 4 from falling with the central tube 2. Further, in order to ensure the sealing between the position limiting tube 5 and the sealing sleeve 1, a plurality of second sealing grooves are arranged at intervals on the position limiting tube 5, and a second sealing member 7 is arranged in each second sealing groove, so that the second sealing member 7 is clamped between the position limiting tube 5 and the sealing sleeve 1 to achieve the effect of sealing.

[0037] In this embodiment, the lower end of the support seat 3 extends into the limiting tube 5, so that the support seat 3 fully supports the claw spring member 4; a plurality of first sealing grooves are arranged on the outer wall of the support seat 3, and a first sealing member 6 is arranged in each first sealing groove, so that the support seat 3 and the limiting tube 5 can be sealed. In this embodiment, illustratively, the first sealing member 6 and the second sealing member 7 are both sealing rings.

[0038] Specifically, the claw spring member 4 includes a connecting portion 41 and a clamping portion 42. The connecting portion 41 and the clamping portion 42 are coaxial annular and can be sleeved on the outside of the center tube 2 and the support seat 3. The inner side of the connecting portion 41 is provided with an internal thread, and the outer side of the end of the center tube 2 is provided with an external thread matching therewith, so that the end of the center tube 2 can be screwed to the connecting portion 41; and the clamping portion 42 is surrounded by a plurality of claws to form a claw shape, one end of the claw is connected to the connecting portion 41, and the other end of the claw extends in a direction away from the connecting portion 41. The outer diameter of the clamping portion 42 gradually decreases from the connecting portion 41 to the direction away from the connecting portion 41, and the clamping portion 42 can be deformed, so that when the support seat 3 is located at the clamping portion 42, the support seat 3 props up the clamping portion 42, so that the claw spring member 4 is in a supporting state; and when the support seat 3 is separated from the clamping portion 42, the claw spring member 4 is in a contracted state, and the clamping portion 42 can be contracted by external force.

[0039] like Figure 1 As shown, in this embodiment, the outer diameter of the support seat 3 is larger than the outer diameter of the center tube 2, so that when the mechanical release is performed, the support seat 3 is lowered and the claw spring member 4 is entirely located on the outside of the center tube 2, thereby providing sufficient space for the contraction of the clamping portion 42 during the lifting process.

[0040] In this embodiment, the second limiting step is located on the outer side of the clamping portion 42, the first limiting step 11 faces the limiting tube 5, and the second limiting step faces the first limiting step 11, so that when the support seat 3 is located on the clamping portion 42, the second limiting step abuts against the first limiting step 11, and the center tube 2 and the support seat 3 are restricted from moving upward. Further, a third limiting step 43 is provided in the clamping portion 42, and the third limiting step 43 is in the same direction as the first limiting step 11, and a fourth limiting step is provided on the outer side of the support seat 3, so that when the support seat 3 is located on the clamping portion 42, the third limiting step 43 abuts against the fourth limiting step, and the second limiting step abuts against the first limiting step 11, so that the limiting abutment is more stable. Furthermore, the first limiting step 11 and the third limiting step 43 are inclined steps, which can make the center tube 2 and the support seat 3 pass more smoothly during the upward movement after the support seat 3 is separated from the clamping portion 42. In this embodiment, a fifth limiting step 51 is provided in the limiting tube 5. After the hydraulic release is completed, the support seat 3 is limited by the fifth limiting step 51 of the limiting tube 5 to prevent the support seat 3 from continuing to fall, making it convenient to remove after the operation is completed.

[0041] like Figure 1As shown, the present application also provides an expandable tail pipe hanger, which includes the above-mentioned expansion pipe release tool, and also includes an expansion pipe 8, which is arranged in the outer pipe 30, one end of which is connected to the upper end of the sealing sleeve 1, and the central pipe 2 moves through the expansion pipe 8, and an expansion cone 9 is arranged in the expansion pipe 8, and the expansion cone 9 is sleeved on the central pipe 2 and can move with the central pipe 2. It can be understood that the lower end of the limit tube 5 in the expansion pipe release tool can be connected to other pipelines such as the tail pipe, so that the tail pipe and other pipelines are connected to the outer pipe 30 through the expansion pipe 8, and a complete wellbore is seamlessly connected. In this process, both mechanical and hydraulic methods can be realized to improve the construction success rate and avoid situations such as drill jamming.

[0042] In this embodiment, the upper end of the sealing sleeve 1 is screwed into the expansion tube 8, and a third sealing member 10 is provided between the expansion tube 8 and the sealing sleeve 1 to seal the gap therebetween. Exemplarily, the third sealing member 10 is a sealing ring.

[0043] In this embodiment, fourth sealing members 20 are provided on both the inner and outer sides of the expansion cone 9, so that a tight seal is formed between the expansion cone 9 and the central tube 2 and between the expansion cone 9 and the expansion tube 8. In addition, a plurality of sealing connectors 40 are provided on the outer wall of the expansion tube 8, so that when the expansion tube 8 is expanded to the outer tube 30, the expansion tube 8 and the outer tube 30 can be tightly squeezed by the sealing connectors 40, thereby forming a tight seal. Exemplarily, the sealing connectors 40 are made of a rubber material resistant to high temperature and high pressure.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An expansion tube release tool, characterized in that: include: A sealing sleeve (1), wherein a limiting tube (5) is inserted into the lower end of the sealing sleeve (1), and a first limiting step (11) is arranged inside the sealing sleeve (1); A central tube (2), the central tube (2) being movably arranged in the sealing sleeve (1); A support seat (3), the support seat (3) being located at the end of the central tube (2) and connected to the central tube (2) via a pin (50); A claw spring member (4), the upper end of the claw spring member (4) being threadedly connected to the central tube (2), the lower end of the claw spring member (4) being in contact with the end of the limiting tube (5), and the outer wall of the claw spring member (4) having a second limiting step; The claw spring component (4) has a supporting state and a retracted state. When in the supporting state, the support seat (3) is inserted into the claw spring component (4) and supports the claw spring component (4) so ​​that the second limiting step and the first limiting step (11) are in limiting contact with each other; when in the retracted state, the support seat (3) is disengaged downward from the claw spring component (4) so ​​that the claw spring component (4) can be retracted and disengaged from the sealing sleeve (1).

2. The expansion tube release tool according to claim 1, characterized in that: The claw spring member (4) comprises a connecting portion (41) and a clamping portion (42); the outer diameter of the clamping portion (42) gradually decreases from the connecting portion (41) in a direction away from the connecting portion (41); and the clamping portion (42) is deformable; the end of the central tube (2) is screwed into the connecting portion (41), and the second limiting step is located outside the clamping portion (42).

3. The expansion tube release tool according to claim 2, characterized in that: A third limiting step (43) is provided inside the clamping portion (42), and the third limiting step (43) is in the same direction as the first limiting step (11). A fourth limiting step is provided on the outer wall of the support seat (3), and when the third limiting step (43) abuts against the fourth limiting step, the second limiting step abuts against the first limiting step (11).

4. The expansion tube release tool according to claim 3, characterized in that: The second limiting step and the third limiting step (43) are inclined steps.

5. The expansion tube releasing tool according to claim 1, characterized in that: A fifth limiting step (51) is arranged inside the limiting tube (5) to limit the support seat (3) from falling.

6. The expansion tube release tool according to claim 1, characterized in that: A first sealing member (6) is provided between the support seat (3) and the position limiting tube (5).

7. The expansion tube releasing tool according to claim 1, characterized in that: A second sealing member (7) is provided between the position limiting tube (5) and the sealing sleeve (1).

8. Expandable liner hanger, characterized in that: include: The expansion tube releasing tool as claimed in any one of claims 1 to 7; An expansion pipe (8), one end of the expansion pipe (8) is connected to the upper end of the sealing sleeve (1), and the central pipe (2) is movable and passes through the expansion pipe (8); An expansion cone (9), the expansion cone (9) is located inside the expansion tube (8) and is sleeved on the central tube (2).

9. The expandable liner hanger according to claim 8, characterized in that: The outer wall of the expansion tube (8) is provided with a plurality of sealing connectors (40).

10. The expandable liner hanger according to claim 8, characterized in that: A third sealing member (10) is provided between the expansion tube (8) and the sealing sleeve (1).

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