Rotatable hydraulic release tool

Abstract

The utility model relates to downhole tool technical field, it is a rotatable hydraulic release tool, it includes upper joint, valve core and lower joint, upper joint includes the connecting section, transmission section and elastic claw section that are sequentially set from top to bottom, and the inboard of transmission section middle part is equipped with the through ring groove, and the inboard of transmission section lower end position corresponding through ring groove below is equipped with the sealing ring table, elastic claw section includes a plurality of elastic claws that are set apart along the circumference, and the upper end of elastic claw is fixedly installed together with transmission section downside, and the outside of elastic claw lower part is equipped with the limit boss, and the inboard of elastic claw lower part is equipped with the support boss. The utility model has the advantages of reasonable structure and compact, convenient to use, and effectively transmitting torque through the key connection upper joint and lower joint, and the valve core is fixed in the upper joint through the shear pin, so that the valve core can enter the release ring groove after the shear pin is cut off relative to the upper joint, and the release ring groove is released to the lower joint limit to realize the release, which has the characteristics of stability, reliability and high efficiency.

Description

Technical Field

[0001] This utility model relates to the field of downhole tool technology and is a rotatable hydraulic release tool. Background Technology

[0002] In the field of well completion technology for oil and gas field development, tailpipe completion is widely used as an important completion method. Depending on specific wellbore structure design, on-site construction conditions, and overall cost-effectiveness considerations, a simplified process is adopted in some completion operations. This involves not using a tailpipe hanger, but instead directly sending the tailpipe string to the predetermined bottom of the well, and then using a special tool to detach and release the string. This process places clear requirements on the accompanying release tool: its structure needs to be simpler and more economical than a tailpipe hanger, while simultaneously possessing extremely high operational safety and functional reliability. To meet this requirement, different types of release tools have been developed in the industry, among which mechanical release tools and hydraulic release tools are currently the two mainstream technological approaches.

[0003] However, both of these existing technologies have significant limitations. Mechanical drop tools typically rely on operations such as pressing down, lifting, or rotating the tubing string to trigger their drop mechanism. A core prerequisite for this process is that the tubing string at the bottom of the tool must remain relatively fixed. In actual complex well conditions, especially in highly deviated or horizontal wells, there is significant friction and axial resistance between the downhole tubing string and the wellbore, making it difficult to maintain stability in the lower tubing string. This leads to frequent failures in mechanical drop operations and low reliability. In contrast, hydraulic drop tools achieve drop by dropping a ball and applying pressure from the wellhead to drive the internal mechanism, eliminating the need for complex tubing string mechanical operations and offering significant advantages in convenience and ease of use. Nevertheless, currently widely used hydraulic drop tools generally suffer from a critical functional defect: their internal structure typically cannot allow for effective torque transmission from the upper tubing string. During the process of running the tailpipe, if the tubing string encounters obstruction due to irregular wellbore, cuttings bed, or wellbore collapse, the operator cannot generate torque by rotating the upper tubing string to assist the tailpipe in passing the obstacle. In the end, the operation has to be stopped, the entire tubing string has to be pulled out, and it has to be run back in after the wellbore problem is resolved. This greatly increases the operation time and economic cost.

[0004] Furthermore, existing hydraulic release tools are generally characterized by complex structural designs. To achieve reliable locking and unlocking functions, these tools often integrate precision pistons, multiple sets of linkage locking blocks, spring elements, and complex flow channel systems. This complex structure not only leads to high manufacturing difficulty and high assembly precision requirements, thus increasing the procurement and maintenance costs of the tools, but more importantly, it introduces more potential failure points. In the harsh environment of downhole drilling, characterized by high temperatures, high pressures, and the presence of corrosive media and abrasive particles, complex mechanical structures are more prone to jamming, wear, or sealing failures. If the release tool fails to unlock properly downhole, it may cause expensive tubing to become stuck in the well, leading to more serious engineering accidents. Therefore, the inherent contradiction between the structural complexity and cost control of existing hydraulic release tools limits their further application, and there is an urgent need for a technical solution that can ensure reliable function while simplifying the structure and reducing costs. Summary of the Invention

[0005] This utility model provides a rotatable hydraulic release tool that overcomes the shortcomings of the prior art. It can effectively solve the problems of poor reliability caused by the complex structure of existing hydraulic release devices, and the inability to transmit torque during operation, which easily leads to the failure of the tubing due to obstruction.

[0006] The technical solution of this utility model is achieved through the following measures: A rotatable hydraulic release tool includes an upper connector, a valve core, and a lower connector. The upper connector includes a connecting section, a transmission section, and a spring claw section arranged sequentially from top to bottom. A connecting annular groove is provided on the inner side of the middle part of the transmission section, and a sealing annular platform is provided on the inner side of the lower end of the transmission section corresponding to the position below the connecting annular groove. The spring claw section includes several elastic claws spaced circumferentially. The upper end of each elastic claw is fixedly installed together with the lower side of the transmission section. A limiting boss is provided on the outer side of the lower part of the elastic claw, and a supporting boss is provided on the inner side of the lower part of the elastic claw. A lower connector is provided on the outer side of the upper connector corresponding to the position below the connecting section, with its lower end positioned below it. The outer side of the middle section of the moving section is connected to the inner side of the lower connector by a key. A limiting ring groove is provided on the inner side of the middle section of the lower connector corresponding to the position of the limiting boss. The limiting boss is located in the limiting ring groove. A limiting ring platform is provided on the inner side of the lower end of the lower connector corresponding to the position of the lower side of the claw section. A valve core is provided on the inner side of the limiting ring platform, with its upper end located on the inner side of the lower part of the connecting section. The valve core includes a large-diameter section and a small-diameter section fixed from top to bottom. The upper part of the large-diameter section is fixed to the upper part of the transmission section by a shear pin. A connecting hole is provided on the lower part of the large-diameter section corresponding to the position of the upper part of the connecting ring groove, which communicates with the connecting ring groove. A release ring groove is provided on the outer side of the middle section of the lower well section corresponding to the position between the sealing ring platform and the support boss.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution: The outer side of the middle section of the aforementioned transmission section can be connected to the inner side of the lower connector via a spline. Six transmission key blocks are evenly distributed along the circumference on the outer side of the middle section. A transmission keyway is provided on the inner side of the upper part of the lower connector corresponding to the position of each transmission key block, and the transmission key block is located in the transmission keyway.

[0008] The above may also include O-rings, with at least one O-ring spaced vertically between the upper connector and the valve core at the position above the shear pin, at least one O-ring spaced vertically between the upper connector and the valve core at the position between the shear pin and the connecting hole, and at least one O-ring spaced vertically between the upper part of the lower connector and the upper connector.

[0009] The aforementioned pawl segment may include six elastic pawls evenly distributed along the circumference.

[0010] The upper outer side of the aforementioned limiting boss may be provided with an upper inclined surface that is higher on the inside and lower on the outside, and the lower outer side of the limiting boss is provided with a lower inclined surface that is lower on the inside and higher on the outside. The upper end of the limiting ring groove matches the upper inclined surface, and the lower end of the limiting ring groove and the upper side of the limiting ring boss match the lower inclined surface.

[0011] The upper connector may have an internal thread on the inner side of its upper end, and the lower connector may have an external thread on the outer side of its lower end.

[0012] This utility model has a reasonable and compact structure and is easy to use. It effectively transmits torque by connecting the upper and lower connectors with a key. The valve core, which is fixed in the upper connector by a shear pin, can move downward relative to the upper connector after the shear pin is cut, allowing the support protrusion to enter the release ring groove, thereby releasing the limit on the lower connector and allowing the valve to be released. It has the characteristics of stability, reliability and high efficiency. Attached Figure Description

[0013] Appendix Figure 1 These are schematic diagrams of the main view and half-section structure of embodiments 1 to 6 of this utility model.

[0014] Appendix Figure 2 For the appendix Figure 1 Structural diagram in use Figure 1 .

[0015] Appendix Figure 3 For the appendix Figure 1 Structural diagram in use Figure 2 .

[0016] The codes in the attached diagram are as follows: 1 is the connecting section, 2 is the transmission section, 3 is the elastic claw, 4 is the large diameter section, 5 is the small diameter section, 6 is the connecting ring groove, 7 is the sealing ring platform, 8 is the limiting boss, 9 is the supporting boss, 10 is the lower connector, 11 is the limiting ring groove, 12 is the limiting ring platform, 13 is the shear pin, 14 is the connecting hole, 15 is the release ring groove, 16 is the transmission key block, 17 is the O-ring seal, 18 is the upper inclined surface, 19 is the lower inclined surface, and 20 is the steel ball. Detailed Implementation

[0017] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0018] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0019] The present invention will be further described below with reference to the embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 , 2As shown in Figure 3, the rotatable hydraulic release tool includes an upper connector, a valve core, and a lower connector 10. The upper connector includes a connecting section 1, a transmission section 2, and a spring claw section arranged sequentially from top to bottom. The transmission section 2 has a connecting annular groove 6 on its inner side in the middle, and a sealing annular platform 7 on the inner side of the lower end of the transmission section 2 corresponding to the position below the connecting annular groove 6. The spring claw section includes several elastic claws 3 arranged at circumferential intervals. The upper end of the elastic claw 3 is fixedly installed together with the lower side of the transmission section 2. A limiting boss 8 is provided on the outer side of the lower part of the elastic claw 3, and a supporting boss 9 is provided on the inner side of the lower part of the elastic claw 3. The lower connector 10 is located below the upper connector on the outer side of the position below the connecting section 1. The outer side of the middle part of the transmission section 2 communicates with the inner side of the lower connector 10. The components are connected together via a key. A limiting ring groove 11 is provided on the inner side of the middle part of the lower connector 10 corresponding to the position of the limiting boss 8. The limiting boss 8 is located in the limiting ring groove 11. A limiting ring platform 12 is provided on the inner side of the lower end of the lower connector 10 corresponding to the position of the lower side of the claw section. A valve core is provided on the inner side of the limiting ring platform 12, with its upper end located on the inner side of the lower part of the connecting section 1. The valve core includes a large diameter section 4 and a small diameter section 5 fixed from top to bottom. The upper part of the large diameter section 4 is fixedly installed with the upper part of the transmission section 2 by a shear pin 13. A connecting hole 14 is provided on the lower part of the large diameter section 4 corresponding to the position of the upper part of the connecting ring groove 6, which communicates with the connecting ring groove 6. A release ring groove 15 is provided on the outer side of the middle part of the lower well section corresponding to the position between the sealing ring platform 7 and the supporting boss 9. During use, the upper and lower connectors 10 are connected by a key to effectively transmit torque. The valve core, which is fixed in the upper connector by the shear pin 13, can move downward relative to the upper connector after the shear pin 13 is cut, allowing the support protrusion to enter the release ring groove 15, thereby releasing the limit on the lower connector 10 and achieving release. It adopts a ball-throwing hydraulic control method, which effectively solves the problems of poor reliability caused by the complex structure of existing hydraulic release devices, and the problem of the tubing encountering obstruction and failing during operation due to the inability to transmit torque. When this utility model is connected to the upper part of the tailpipe to be released, and the tailpipe operation encounters obstruction, the tubing sent into the wellhead is rotated. Through the key between the outer side of the middle of the transmission section 2 and the inner side of the lower connector 10, the torque is transmitted from the upper connector to the lower connector 10. The lower connector 10 drives the tailpipe to rotate, thus releasing the obstruction. When the tailpipe reaches the designed position, the steel ball 20 is dropped into the well from the wellhead. After the ball sits on the upper end of the valve core, the pressure is applied step by step. When the pressure suddenly drops, it indicates that the shear pin 13 has been sheared. The valve core moves downward, the lower end of the elastic claw 3 enters the release annular groove 15, the support boss 9 loses the radial support of the outer wall of the small diameter section 5, the limiting boss 8 disengages from the limiting annular groove 11, the tubing is lifted and released, the upper connector, valve core and steel ball 20 are pulled out of the wellhead, and the lower connector 10 and tailpipe remain in the well. The fluid in the tubing flows to the lower tubing through the connecting annular groove 6 and the connecting hole 14, realizing fluid circulation.

[0020] The above-mentioned rotatable hydraulic release tool can be further optimized and / or improved according to actual needs: Example 2: As shown in the attached document Figure 1 , 2As shown in Figure 3, the outer side of the middle section of the transmission segment 2 is connected to the inner side of the lower connector 10 by a spline. Six transmission key blocks 16 are evenly distributed around the circumference of the outer side of the middle section of the transmission segment 2. A transmission keyway is provided on the upper inner side of the lower connector 10 corresponding to the position of each transmission key block 16, and the transmission key block 16 is located in the transmission keyway. In use, this arrangement can better transmit torque.

[0021] Example 3: As shown in the attached document Figure 1 , 2 As shown in Figure 3, it also includes O-ring seals 17. At least one O-ring seal 17 is provided vertically between the upper connector and the valve core at the position corresponding to the position above the shear pin 13, at least one O-ring seal 17 is provided vertically between the upper connector and the valve core at the position corresponding to the position between the shear pin 13 and the connecting hole 14, and at least one O-ring seal 17 is provided vertically between the upper part of the lower connector 10 and the upper connector. During use, this arrangement enhances the sealing performance between the components.

[0022] Example 4: As shown in the appendix Figure 1 , 2 As shown in Figure 3, the spring claw section includes six elastic claws 3 evenly distributed along the circumference. During use, this arrangement makes the invention more stable and reliable. Before the device is released, the upper connector and lower connector 10 are stably positioned together by the limiting protrusions located on the outer side of the lower ends of the six elastic claws 3 within the limiting ring groove 11.

[0023] Example 5: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the upper outer side of the limiting boss 8 is provided with an upper inclined surface 18 that is higher on the inside and lower on the outside, and the lower outer side of the limiting boss 8 is provided with a lower inclined surface 19 that is lower on the inside and higher on the outside. The upper end of the limiting ring groove 11 matches the upper inclined surface 18, and the lower end of the limiting ring groove 11 and the upper side of the limiting ring platform 12 match the lower inclined surface 19. During use, this setting facilitates the limiting boss 8 to disengage from the limiting ring groove 11 after the supporting boss 9 loses the radial support of the outer wall of the small diameter section 5, thus allowing it to be released.

[0024] Example 6: As shown in the appendix Figure 1 , 2 As shown in Figure 3, the upper connector has an internal thread on the inner side of its upper end, and the lower connector 10 has an external thread on the outer side of its lower end.

[0025] The above technical features constitute the preferred embodiment of this utility model, which has strong adaptability and the best implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A rotatable hydraulic release tool, characterized in that... The system includes an upper connector, a valve core, and a lower connector. The upper connector comprises a connecting section, a transmission section, and a spring claw section arranged sequentially from top to bottom. The transmission section has a connecting annular groove on its inner side in the middle, and a sealing annular platform on the inner side of the lower end of the transmission section corresponding to the position below the connecting annular groove. The spring claw section includes several elastic claws spaced circumferentially. The upper end of each elastic claw is fixedly installed to the lower side of the transmission section, and a limiting boss is provided on the outer side of the lower part of the elastic claw, while a supporting boss is provided on the inner side of the lower part of the elastic claw. A lower connector is located on the outer side of the upper connector corresponding to the lower side of the connecting section, with its lower end positioned below it. The outer side of the middle section of the transmission section is connected to the inner side of the lower connector via a key. Together, a limiting ring groove is provided on the inner side of the middle part of the lower connector corresponding to the position of the limiting boss, and the limiting boss is located in the limiting ring groove. A limiting ring platform is provided on the inner side of the lower end of the lower connector corresponding to the position of the lower side of the claw section. A valve core is provided on the inner side of the limiting ring platform, with its upper end located on the inner side of the lower part of the connecting section. The valve core includes a large-diameter section and a small-diameter section fixed from top to bottom. The upper part of the large-diameter section is fixedly installed together with the upper part of the transmission section by a shear pin. A connecting hole is provided on the lower part of the large-diameter section corresponding to the position of the upper part of the connecting ring groove, which can communicate with the connecting ring groove. A release ring groove is provided on the outer side of the middle part of the lower well section corresponding to the position between the sealing ring platform and the supporting boss.

2. The rotatable hydraulic release tool according to claim 1, characterized in that... The outer side of the middle section of the transmission section is connected to the inner side of the lower connector by a spline. Six transmission key blocks are evenly distributed along the circumference on the outer side of the middle section of the transmission section. A transmission keyway is provided on the inner side of the upper part of the lower connector corresponding to the position of each transmission key block, and the transmission key block is located in the transmission keyway.

3. The rotatable hydraulic release tool according to claim 1 or 2, characterized in that... It also includes O-rings, with at least one O-ring spaced vertically between the upper connector and the valve core at the position above the shear pin, at least one O-ring spaced vertically between the upper connector and the valve core at the position between the shear pin and the connecting hole, and at least one O-ring spaced vertically between the upper part of the lower connector and the upper connector.

4. The rotatable hydraulic release tool according to claim 1 or 2, characterized in that... The pawl section includes six elastic pawls evenly distributed along the circumference.

5. The rotatable hydraulic release tool according to claim 3, characterized in that... The pawl section includes six elastic pawls evenly distributed along the circumference.

6. The rotatable hydraulic release tool according to claim 1, 2, or 5, characterized in that... The upper outer side of the limiting boss is provided with an upper inclined surface that is higher on the inside and lower on the outside, and the lower outer side of the limiting boss is provided with a lower inclined surface that is lower on the inside and higher on the outside. The upper end of the limiting ring groove matches the upper inclined surface, and the lower end of the limiting ring groove and the upper side of the limiting ring boss match the lower inclined surface.

7. The rotatable hydraulic release tool according to claim 3, characterized in that... The upper outer side of the limiting boss is provided with an upper inclined surface that is higher on the inside and lower on the outside, and the lower outer side of the limiting boss is provided with a lower inclined surface that is lower on the inside and higher on the outside. The upper end of the limiting ring groove matches the upper inclined surface, and the lower end of the limiting ring groove and the upper side of the limiting ring boss match the lower inclined surface.

8. The rotatable hydraulic release tool according to claim 4, characterized in that... The upper outer side of the limiting boss is provided with an upper inclined surface that is higher on the inside and lower on the outside, and the lower outer side of the limiting boss is provided with a lower inclined surface that is lower on the inside and higher on the outside. The upper end of the limiting ring groove matches the upper inclined surface, and the lower end of the limiting ring groove and the upper side of the limiting ring boss match the lower inclined surface.

9. The rotatable hydraulic release tool according to claim 1, 2, 5, 7, or 8, characterized in that... The upper connector has an internal thread on the inner side of its upper end, and the lower connector has an external thread on the outer side of its lower end.

10. The rotatable hydraulic release tool according to claim 6, characterized in that... The upper connector has an internal thread on the inner side of its upper end, and the lower connector has an external thread on the outer side of its lower end.

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