Mechanical hydraulic double-acting drilling liner suspension sealing device and well drilling system

Abstract

The mechanical hydraulic double-acting tail pipe hanging sealing device comprises a releasing sub, a base pipe, a hanging sleeve and a seat hanging sleeve, the outer wall of the base pipe is sequentially sleeved with a sealing rubber barrel, an extrusion sleeve, a hydraulic rubber barrel and a hydraulic cylinder barrel from bottom to top, and the base pipe can move downwards relative to the hanging sleeve; a sealed hydraulic cavity is formed between the outer wall of the base pipe and the inner wall of the hydraulic cylinder barrel, hydraulic pressure enters the hydraulic cavity through the liquid inlet hole to drive the hydraulic cylinder barrel to move downwards relative to the base pipe to extrude the hydraulic rubber barrel, and the hydraulic rubber barrel bulges outwards to be in sealing contact with the inner wall of the upper-layer sleeve. The drilling liner can be hung and sealed in a mechanical and hydraulic double-acting mode, operation is easy, sealing is reliable, the risk is low, cost is low, the drilling liner is suitable for well completion operation in various environments, hydraulic sitting hanging and slip hanging are not needed, and the on-site application advantage is obvious.

Description

Technical Field

[0001] The present invention relates to the field of drilling equipment, and in particular to a mechanical hydraulic double-acting tail pipe suspension sealing device. In addition, the present invention also relates to a drilling system comprising the mechanical hydraulic double-acting tail pipe suspension sealing device. Background Art

[0002] With the continuous deepening of oilfield development, liner completion technology has developed rapidly, and its completion methods have shown a trend of multi-form and diversified development, becoming one of the indispensable completion methods in side-drilled wells, deep wells, ultra-deep wells, complex structure wells and special process wells. The casing string that has not extended to the wellhead is called the liner. The liner is usually sent down with a drill pipe, and the liner is suspended in the upper casing by a liner hanger to perform liner cementing or screen completion operations. It is widely used in liner operations in complex wells such as side-drilled wells, deepening wells, ultra-deep wells and small clearance wells.

[0003] At present, the liner hanger is mainly divided into the slip-type liner hanger and the expansion type liner hanger. Various slip-type liner hangers mainly use the hydraulic cylinder to push the slip teeth to achieve the suspension of the liner column. Some slip-type hangers have special functions such as top sealing and rotating liner to meet the requirements of special well conditions. However, the structure is relatively complex, there is a risk of complex situations underground, the price cost is relatively high, and there are still certain application limitations in the low-cost market and the market with strict cost control.

[0004] The present invention aims to provide a mechanical hydraulic double-acting tail pipe suspension sealing device, which realizes the inclined surface suspension and top sealing operation of the tail pipe by means of tail pipe column gravity and hydraulic pressure. Summary of the invention

[0005] The purpose of the present invention is to provide a mechanical hydraulic double-acting liner suspension sealing device, which can realize the suspension and sealing of the liner by mechanical and hydraulic double-acting methods, has simple operation, reliable sealing, low risk, low cost, and is suitable for completion operations in various environments. Another purpose of the present invention is to provide a drilling system including the above-mentioned mechanical hydraulic double-acting liner suspension sealing device.

[0006] In order to solve the above technical problems, the present invention provides a mechanical hydraulic double-acting tail pipe suspension sealing device, comprising a coaxially arranged release joint, a base pipe, a suspension sleeve and a sitting sleeve, the upper end of the sitting sleeve is connected to the lower part of the upper casing, the lower end of the release joint is connected to the upper end of the base pipe, the lower end of the base pipe is inserted into the upper end opening of the suspension sleeve, the base pipe and the release joint extend into the interior of the upper casing, the suspension sleeve is inserted into the interior of the sitting sleeve, the sitting sleeve supports the suspension sleeve upward, and the outer wall of the base pipe is sequentially covered with a sealing rubber cylinder, an extrusion sleeve, a hydraulic rubber cylinder and a hydraulic cylinder from bottom to top, the upper end of the sealing rubber cylinder is abutted against the lower end of the extrusion sleeve, and the lower end of the sealing rubber cylinder is abutted against the suspension sleeve. The upper ends of the sleeves are abutted, the base pipe can move downward relative to the suspension sleeve, and drive the extrusion sleeve to move downward to extrude the sealing rubber sleeve, the sealing rubber sleeve bulges outward and is in sealing contact with the inner wall of the upper casing, the upper end of the hydraulic rubber sleeve is abutted against the lower end of the hydraulic cylinder, the lower end of the hydraulic rubber sleeve is abutted against the upper end of the extrusion sleeve, a sealed hydraulic cavity is provided between the outer wall of the base pipe and the inner wall of the hydraulic cylinder, the base pipe is provided with a liquid inlet hole at a position corresponding to the hydraulic cavity, the hydraulic pressure enters the hydraulic cavity through the liquid inlet hole, and the hydraulic cylinder is driven to move downward relative to the base pipe to extrude the hydraulic rubber sleeve, the hydraulic rubber sleeve bulges outward and is in sealing contact with the inner wall of the upper casing.

[0007] Preferably, a lower boss sealingly fitting the outer wall of the base tube is provided at the lower end of the inner wall of the hydraulic cylinder, and an upper boss sealingly fitting the middle part of the inner wall of the hydraulic cylinder is provided on the outer wall of the base tube, the hydraulic cavity is between the upper boss and the lower boss, and the liquid inlet hole is located below the upper boss.

[0008] Preferably, a hydraulic pin is connected between the upper end of the inner wall of the hydraulic cylinder and the upper end of the outer wall of the base pipe, so that the lower boss is away from the upper boss during hydraulic sealing operation.

[0009] Preferably, a positioning locking block is provided on the outer wall of the base pipe, and the positioning locking block is located between the hydraulic pin and the upper boss. A locking step is provided on the upper end of the inner wall of the hydraulic cylinder, and the locking step engages with the positioning locking block when the hydraulic cylinder moves downward.

[0010] Preferably, the upper and lower ends of the hydraulic rubber cartridge are provided with outwardly contracted inclined surfaces, and the lower end of the hydraulic cylinder and the upper end of the extrusion sleeve are both provided with matching inclined surfaces, so that the hydraulic rubber cartridge is embedded between the hydraulic cylinder and the extrusion sleeve.

[0011] Preferably, it comprises a plurality of the sealing rubber tubes arranged in sequence along the axial direction, and a spacer ring is provided between adjacent sealing rubber tubes.

[0012] Preferably, it further comprises a casing nipple, the upper end of which extends into the lower end opening of the base pipe and is fixedly connected, the lower end of which is connected to the tail pipe, and the casing nipple passes through the suspension sleeve and the seating sleeve;

[0013] Preferably, a stepped hole is provided in the suspension sleeve, a limiting step is provided in the middle of the stepped hole, the upper end diameter of the stepped hole matches the outer wall diameter of the base pipe, the lower end diameter of the stepped hole matches the diameter of the casing short section, the limiting step can be abutted against the lower end of the base pipe to limit the descending stroke of the base pipe; a shear pin is connected between the lower end of the outer wall of the base pipe and the upper end of the inner wall of the suspension sleeve, so that there is a descending stroke distance between the lower end of the base pipe and the limiting step before the sealing operation.

[0014] Preferably, the upper end of the release joint is provided with an internal thread connected to the drill pipe, the lower end of the release joint is provided with an external thread connected to the base pipe, and the release joint is connected to the base pipe through a reverse thread.

[0015] The present invention also provides a drilling system, comprising the mechanical-hydraulic double-acting tail pipe suspension sealing device as described in any one of the above.

[0016] The present invention provides a mechanical hydraulic double-acting tail pipe suspension sealing device, comprising a coaxially arranged release joint, a base pipe, a suspension sleeve and a sitting sleeve, wherein the upper end of the sitting sleeve is connected to the lower part of the upper casing, the lower end of the release joint is connected to the upper end of the base pipe, the lower end of the base pipe is inserted into the upper end opening of the suspension sleeve, the base pipe and the release joint extend into the interior of the upper casing, the suspension sleeve is inserted into the interior of the sitting sleeve, the sitting sleeve supports the suspension sleeve upward, and the outer wall of the base pipe is sequentially covered with a sealing rubber cylinder, an extrusion sleeve, a hydraulic rubber cylinder and a hydraulic cylinder from bottom to top, the upper end of the sealing rubber cylinder is abutted against the lower end of the extrusion sleeve, and the lower end of the sealing rubber cylinder is abutted against the suspension sleeve The upper ends of the cylinders are abutted, the base pipe can move downward relative to the hanging sleeve, and drive the extrusion sleeve to move downward to extrude the sealing rubber cylinder, the sealing rubber cylinder bulges outward and is in sealing contact with the inner wall of the upper casing, the upper end of the hydraulic rubber cylinder is abutted against the lower end of the hydraulic cylinder, the lower end of the hydraulic rubber cylinder is abutted against the upper end of the extrusion sleeve, a sealed hydraulic cavity is provided between the outer wall of the base pipe and the inner wall of the hydraulic cylinder, a liquid inlet hole is provided at the position of the base pipe corresponding to the hydraulic cavity, hydraulic pressure enters the hydraulic cavity through the liquid inlet hole, and the hydraulic cylinder is driven to move downward relative to the base pipe to extrude the hydraulic rubber cylinder, the hydraulic rubber cylinder bulges outward and is in sealing contact with the inner wall of the upper casing.

[0017] During the suspension operation, the seating sleeve is first put into the well with the upper casing. After the other devices and the tail pipe are put into the well, the tail pipe and the base pipe move downward along the active stroke under the action of gravity, driving the extrusion sleeve downward to squeeze the sealing rubber cylinder, realizing the deformation and sealing of the sealing rubber cylinder, completing the suspension and sealing operation of the tail pipe. At the same time, under hydraulic operation, the pressure pushes the hydraulic cylinder to squeeze the hydraulic rubber cylinder to complete the double-stage sealing operation. The suspension and sealing of the tail pipe can be achieved through mechanical and hydraulic dual-action methods. The operation is simple, the sealing is reliable, the risk is low, the cost is low, and it is suitable for completion operations in various environments. There is no need for hydraulic seating and slip suspension, and the advantages of field application are obvious.

[0018] The present invention also provides a drilling system including the above-mentioned mechanical hydraulic double-acting tail pipe suspension sealing device. Since the above-mentioned mechanical hydraulic double-acting tail pipe suspension sealing device has the above-mentioned technical effects, the above-mentioned drilling system should also have the same technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a specific implementation of the mechanical-hydraulic double-acting tail pipe suspension sealing device provided by the present invention;

[0020] Figure 2 A schematic diagram of the expansion and sealing state of a specific implementation of the mechanical hydraulic double-acting tail pipe suspension sealing device provided by the present invention;

[0021] Figure 3 This is a structural schematic diagram of a seating sleeve in a specific implementation manner of the mechanical hydraulic double-acting tail pipe suspension sealing device provided by the present invention;

[0022] Figure 4 A schematic diagram of a well-entering operation of a hanging sleeve of a specific embodiment of the mechanical hydraulic double-acting tail pipe hanging sealing device provided by the present invention;

[0023] Figure 5 A schematic diagram of suspension operation of a specific embodiment of the mechanical hydraulic double-acting tail pipe suspension sealing device provided by the present invention;

[0024] Figure 6 A schematic diagram of mechanical sealing operation of a specific implementation of the mechanical hydraulic double-acting tail pipe suspension sealing device provided by the present invention;

[0025] Figure 7 A schematic diagram of hydraulic sealing operation of a specific implementation of the mechanical hydraulic double-acting tail pipe suspension sealing device provided by the present invention;

[0026] Figure 8 A schematic diagram of a hands-off operation of a specific implementation of the mechanical-hydraulic double-acting tail pipe suspension sealing device provided by the present invention.

[0027] Among them, the release joint 1, the base pipe 2, the upper boss 21, the liquid inlet hole 22, the hanging sleeve 3, the limiting step 31, the shear pin 32, the hanging inclined surface 33, the sitting sleeve 4, the sitting bearing surface 41, the upper casing 5, the extrusion sleeve 6, the sealing rubber cylinder 7, the casing short section 8, the tail pipe 9, the floating shoe 10, the drill pipe 11, the spacer ring 12, the hydraulic rubber cylinder 13, the hydraulic cylinder 14, the lower boss 141, the locking step 142, the hydraulic pin 143, and the positioning lock block 15. DETAILED DESCRIPTION

[0028] The core of the present invention is to provide a mechanical hydraulic double-acting tail pipe suspension sealing device, which can realize the suspension and sealing of the tail pipe through mechanical and hydraulic double-acting methods, with simple operation, reliable sealing, low risk, low cost, and suitable for completion operations in various environments. Another core of the present invention is to provide a drilling system including the above-mentioned mechanical hydraulic double-acting tail pipe suspension sealing device.

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Please refer to Figures 1 to 8 , Figure 1 A schematic structural diagram of a specific implementation of the mechanical-hydraulic double-acting tail pipe suspension sealing device provided by the present invention; Figure 2 A schematic diagram of the expansion and sealing state of a specific implementation of the mechanical hydraulic double-acting tail pipe suspension sealing device provided by the present invention; Figure 3 This is a structural schematic diagram of a seating sleeve in a specific implementation manner of the mechanical hydraulic double-acting tail pipe suspension sealing device provided by the present invention; Figure 4 A schematic diagram of a well-entering operation of a hanging sleeve of a specific embodiment of the mechanical hydraulic double-acting tail pipe hanging sealing device provided by the present invention; Figure 5 A schematic diagram of suspension operation of a specific embodiment of the mechanical hydraulic double-acting tail pipe suspension sealing device provided by the present invention; Figure 6 A schematic diagram of mechanical sealing operation of a specific implementation of the mechanical hydraulic double-acting tail pipe suspension sealing device provided by the present invention; Figure 7 A schematic diagram of hydraulic sealing operation of a specific implementation of the mechanical hydraulic double-acting tail pipe suspension sealing device provided by the present invention; Figure 8 A schematic diagram of a hands-off operation of a specific implementation of the mechanical-hydraulic double-acting tail pipe suspension sealing device provided by the present invention.

[0031] The specific embodiment of the present invention provides a mechanical hydraulic double-acting tail pipe suspension sealing device, including a coaxially arranged release joint 1, a base pipe 2, a suspension sleeve 3 and a seat sleeve 4, and each component is a pipe fitting that penetrates axially from top to bottom. Among them, the seat sleeve 4 is put into the well separately from other components, the seat sleeve 4 is fixed in position, the upper end of the seat sleeve 4 is connected to the lower part of the upper casing 5, and the lower end of the seat sleeve 4 is connected to the floating shoe 10. On the other hand, the upper end of the release joint 1 is connected to the drill pipe 11, the lower end of the release joint 1 is connected to the upper end of the base pipe 2, and the lower end of the base pipe 2 is inserted into the upper end opening of the suspension sleeve 3. Furthermore, when other components are put into the well, the drill pipe 11 drives the release joint 1, the base pipe 2 and the suspension sleeve 3 to extend into the interior of the upper casing 5, and the suspension sleeve 3 is inserted into the interior of the seat sleeve 4, and the seat sleeve 4 supports the suspension sleeve 3 upward.

[0032] The outer wall of the base pipe 2 is sequentially covered with a sealing rubber tube 7, an extrusion sleeve 6, a hydraulic rubber tube 13 and a hydraulic cylinder 14 from bottom to top. The upper end of the sealing rubber tube 7 abuts against the lower end of the extrusion sleeve 6, and the lower end of the sealing rubber tube 7 abuts against the upper end of the suspension sleeve 3. When the mechanical seal is in operation, under the action of gravity, the tail pipe 9 pulls the base pipe 2 and the extrusion sleeve 6 to move downward, that is, the base pipe 2 moves downward relative to the suspension sleeve 3, driving the extrusion sleeve 6 to move downward and squeeze the sealing rubber tube 7, and the sealing rubber tube 7 bulges outward to make sealing contact with the inner wall of the upper casing 5. In addition, the upper end of the hydraulic rubber cylinder 13 abuts against the lower end of the hydraulic cylinder 14, and the lower end of the hydraulic rubber cylinder 13 abuts against the upper end of the extrusion sleeve 6. A sealed hydraulic cavity is provided between the outer wall of the base pipe 2 and the inner wall of the hydraulic cylinder 14. A liquid inlet hole 22 is provided on the side wall of the base pipe 2 at a position corresponding to the hydraulic cavity. During the hydraulic sealing operation, pressure is applied from the inside of the drill pipe 11, and hydraulic pressure enters the hydraulic cavity through the liquid inlet hole 22, driving the hydraulic cylinder 14 to move downward relative to the base pipe 2, thereby squeezing the hydraulic rubber cylinder 13, and the hydraulic rubber cylinder 13 bulges outward to be in sealing contact with the inner wall of the upper casing 5.

[0033] During the suspension operation, the seating sleeve 4 is first put into the well along with the upper casing 5. After the other devices and the tail pipe 9 are put into the well, the tail pipe 9 and the base pipe 2 move downward along the active stroke under the action of gravity, driving the extrusion sleeve 6 to move downward to extrude the sealing rubber tube 7, so as to achieve the deformation and sealing of the sealing rubber tube 7, and complete the suspension and sealing operation of the tail pipe 9. At the same time, under hydraulic operation, the pressure pushes the hydraulic cylinder 14 to extrude the hydraulic rubber tube 13, completing the double-stage sealing operation. The suspension and sealing of the tail pipe 9 can be achieved through the mechanical and hydraulic dual-action mode, which is simple to operate, reliable in sealing, low in risk, and low in cost. It is suitable for completion operations in various environments, does not require hydraulic seating and slip suspension, and has obvious advantages in field application.

[0034] Furthermore, a casing pup section 8 is provided, the upper end of which extends into the lower end opening of the base pipe 2 and is fixedly connected to the base pipe 2, the lower end of which is connected to the tail pipe 9 through a threaded sleeve, and the casing pup section 8 passes through the hanging sleeve 3 and the sitting sleeve 4.

[0035] Specifically, a stepped hole is provided in the suspension sleeve 3, and a limiting step 31 is provided in the middle of the stepped hole. The diameter of the upper end of the stepped hole matches the diameter of the outer wall of the base pipe 2, and the diameter of the lower end of the stepped hole matches the diameter of the casing short section 8. Therefore, the diameter of the upper end of the stepped hole is larger than the diameter of the lower end of the stepped hole, so that the end face of the limiting step 31 faces upward. Before the sealing operation, there is a descending stroke distance between the lower end of the base pipe 2 and the limiting step 31. During the sealing operation, as the base pipe 2 moves downward relative to the suspension sleeve 3, the base pipe 2 continues to extend into the suspension sleeve 3 along the descending stroke distance until the lower end of the base pipe 2 abuts against the limiting step 31, indicating that the base pipe 2 has descended into place, which is used to limit the descending stroke of the base pipe 2.

[0036] In order to fix the relative position of the base pipe 2 and the suspension sleeve 3 before the sealing operation, a shear pin 32 is connected between the lower end of the outer wall of the base pipe 2 and the upper end of the inner wall of the suspension sleeve 3 to ensure the descending travel distance. When the sealing operation starts, the shear pin 32 is sheared to enable the base pipe 2 to move downward.

[0037] In the mechanical hydraulic double-acting tail pipe suspension sealing device provided in the specific embodiment of the present invention, a lower boss 141 sealingly fitting the outer wall of the base pipe 2 is arranged at the lower end of the inner wall of the hydraulic cylinder 14, the lower boss 141 is an annular boss, the inner side of the lower boss 141 tightly surrounds the outer wall of the base pipe 2, and a sealing ring is arranged on the inner side of the lower boss 141, and an upper boss 21 sealingly fitting the middle part of the inner wall of the hydraulic cylinder 14 is arranged on the outer wall of the base pipe 2, the upper boss 21 is also an annular boss, the inner wall of the hydraulic cylinder 14 tightly surrounds the outer side of the upper boss 21, and a sealing ring is arranged on the outer side of the upper boss 21. With the support of the two bosses, an annular gap is formed between the inner wall of the hydraulic cylinder 14 and the outer wall of the base pipe 2. At the same time, there is a stroke distance between the upper boss 21 and the lower boss 141, thereby forming a hydraulic cavity between the upper boss 21 and the lower boss 141. The liquid inlet hole 22 is located below the upper boss 21, so that the liquid inlet hole 22 is located between the upper boss 21 and the lower boss 141, and the liquid inlet hole 22 is connected to the hydraulic cavity.

[0038] In order to fix the relative position of the hydraulic cylinder 14 and the base pipe 2 before the sealing operation, a hydraulic pin 143 is connected between the upper end of the inner wall of the hydraulic cylinder 14 and the upper end of the outer wall of the base pipe 2 to ensure the descending stroke distance. When the sealing operation starts, the hydraulic pin 143 is sheared and the position of the base pipe 2 is fixed. During the hydraulic sealing operation, the hydraulic cylinder 14 is hydraulically driven to move downward relative to the base pipe 2, and the lower boss 141 is away from the upper boss 21.

[0039] Furthermore, a positioning locking block 15 is provided on the outer wall of the base pipe 2, and the positioning locking block 15 is located between the hydraulic pin 143 and the upper boss 21. A locking step 142 is provided on the upper end of the inner wall of the hydraulic cylinder 14. After the hydraulic cylinder 14 moves downward into position, the locking step 142 engages with the positioning locking block 15 to prevent the hydraulic cylinder 14 from moving upward again.

[0040] Preferably, the upper and lower ends of the hydraulic rubber cylinder 13 are provided with outwardly contracted inclined surfaces, and the lower end of the hydraulic cylinder 14 and the upper end of the extrusion sleeve 6 are provided with matching inclined surfaces, so that the hydraulic rubber cylinder 13 is embedded between the hydraulic cylinder 14 and the extrusion sleeve 6. Among them, the inner wall of the extrusion sleeve 6 is provided with an upward outer positioning step, and the corresponding position of the outer wall of the base pipe 2 is provided with a downward inner positioning step, and the two are offset, so that when the base pipe 2 moves downward, it pushes the extrusion sleeve 6 to move downward synchronously.

[0041] In the mechanical hydraulic double-acting tail pipe suspension sealing device provided in the specific embodiment of the present invention, in order to make the seating sleeve 4 stably support the suspension sleeve 3, a downwardly contracted suspension slope 33 is provided on the outer wall of the suspension sleeve 3, and a seating bearing surface 41 in contact with the suspension slope 33 is provided on the inner wall of the seating sleeve 4. The seating bearing surface 41 and the suspension slope 33 have the same inclination angle, and the seating bearing surface 41 supports the suspension slope 33. When the suspension sleeve 3 enters the seating sleeve 4, the suspension slope 33 is in close contact with and abuts against the seating bearing surface 41, fixing the axial position of the suspension sleeve 3.

[0042] The upper end of the seating sleeve 4 is provided with an internal thread connected to the upper casing 5, and the lower end of the seating sleeve 4 is provided with an external thread connected to the floating shoe 10. The upper end of the release joint 1 is provided with an internal thread connected to the drill pipe 11, and the lower end of the release joint 1 is provided with an external thread connected to the base pipe 2. Preferably, the release joint 1 is connected to the base pipe 2 through a reverse thread, and the drill pipe 11 is fed forward to disengage the reverse thread connecting the base pipe 2 and the release joint 1, so as to realize the release operation of the release joint 1 and the tail pipe 9.

[0043] On the basis of the mechanical hydraulic double-acting tail pipe suspension sealing device provided in the above-mentioned specific embodiments, it includes a plurality of sealing rubber tubes 7 arranged in sequence along the axial direction. At the same time, spacer rings 12 are arranged between adjacent sealing rubber tubes 7. The number is adjusted according to the downhole sealing requirements. Specifically, three sealing rubber tubes 7 and two spacer rings 12 can be set. The material of the sealing rubber tube 7 can select rubber parts with different temperature resistance according to the working stability.

[0044] The specific working process is:

[0045] First, the seating sleeve 4 is put into the well for operation. The seating sleeve 4 is connected to the lower part of the upper casing 5 and is first lowered into a designated position in the well, and drilling continues after cementing.

[0046] Secondly, the liner 9 is lowered into the well by running the drill pipe 11 into the liner 9 of the next size, and the hanging sleeve 3 is located at the top of the liner 9 and lowered into the well together.

[0047] Once again, during the hanging operation, when the tail pipe 9 is in place, the hanging inclined surface 33 of the hanging sleeve 3 contacts the seating bearing surface 41 of the seating sleeve 4, and the tail pipe 9 can be seated in the seating sleeve 4 through the hanging sleeve 3. If cementing operation is required, cementing is performed first and then hanging and sealing operation is performed.

[0048] Secondly, for the mechanical sealing operation, after the tail pipe 9 is suspended, under the action of gravity, the tail pipe 9 pulls the casing short section 8 and the base pipe 2 downward along the movable stroke, and the extrusion sleeve 6 extrudes the sealing rubber cylinder 7 as it moves downward to achieve downward extrusion. When the lower end surface of the base pipe 2 contacts the limiting step 31, the movable stroke completely disappears, and the sealing rubber cylinder 7 is deformed and bulged to complete the mechanical sealing operation.

[0049] Afterwards, the hydraulic sealing operation is performed. After the device realizes mechanical sealing, pressure is applied from the drill pipe 11. The hydraulic pressure is transmitted to the hydraulic cylinder cavity through the liquid inlet hole 22 of the base pipe 2. The hydraulic pin 143 connecting the hydraulic cylinder barrel 14 and the base pipe 2 is sheared, pushing the hydraulic cylinder barrel 14 downward and squeezing the hydraulic rubber tube 13. When the hydraulic cylinder barrel 14 descends to the locking step 142 and is locked with the positioning locking block 15, the hydraulic cylinder barrel 14 is fixed and limited, and the hydraulic rubber tube 13 is deformed and bulged to complete the hydraulic sealing operation.

[0050] Finally, the release operation is performed. When the tail pipe 9 completes the suspension sealing, it is sent into the drill pipe 11 in the forward direction to disengage the reverse thread connecting the extrusion sleeve 6 and the release joint 1, thereby realizing the release operation of the release joint 1 and the tail pipe 9, pulling out and sending in the drilling tools, and completing the well.

[0051] In addition to the above-mentioned mechanical hydraulic double-acting tail pipe suspension sealing device, a specific embodiment of the present invention also provides a drilling system including the above-mentioned mechanical hydraulic double-acting tail pipe suspension sealing device. Please refer to the prior art for the structure of other parts of the drilling system, which will not be repeated in this article.

[0052] The mechanical hydraulic double-acting tail pipe suspension sealing device and drilling system provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. The description of the above embodiment is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A mechanical hydraulic double-acting tail pipe suspension sealing device, comprising a coaxially arranged release joint (1), a base pipe (2), a suspension sleeve (3) and a seating sleeve (4), wherein the upper end of the seating sleeve (4) is connected to the lower part of an upper casing (5), the lower end of the release joint (1) is connected to the upper end of the base pipe (2), the lower end of the base pipe (2) is inserted into the upper end opening of the suspension sleeve (3), the base pipe (2) and the release joint (1) extend into the upper casing (5). The inner part of the layer casing (5), the hanging sleeve (3) is inserted into the inner part of the sitting sleeve (4), the sitting sleeve (4) supports the hanging sleeve (3) upwards, and the outer wall of the base pipe (2) is sequentially sleeved with a sealing rubber sleeve (7), an extrusion sleeve (6), a hydraulic rubber sleeve (13) and a hydraulic cylinder (14) from bottom to top, the upper end of the sealing rubber sleeve (7) abuts against the lower end of the extrusion sleeve (6), and the lower end of the sealing rubber sleeve (7) abuts against the hanging sleeve (3). ) is abutted against the upper end of the base pipe (2), the base pipe (2) can move downward relative to the suspension sleeve (3), and drive the extrusion sleeve (6) to move downward to squeeze the sealing rubber cylinder (7), the sealing rubber cylinder (7) bulges outward and is in sealing contact with the inner wall of the upper casing (5), the upper end of the hydraulic rubber cylinder (13) is abutted against the lower end of the hydraulic cylinder (14), the lower end of the hydraulic rubber cylinder (13) is abutted against the upper end of the extrusion sleeve (6), a sealed hydraulic cavity is provided between the outer wall of the base pipe (2) and the inner wall of the hydraulic cylinder (14), the base pipe (2) is provided with a liquid inlet hole (22) at a position corresponding to the hydraulic cavity, hydraulic pressure enters the hydraulic cavity through the liquid inlet hole (22), driving the hydraulic cylinder (14) to move downward relative to the base pipe (2) to squeeze the hydraulic rubber cylinder (13), the hydraulic rubber cylinder (13) bulges outward and is in sealing contact with the inner wall of the upper casing (5).

2. The mechanical hydraulic double-acting tail pipe suspension sealing device according to claim 1, It is characterized in that The lower end of the inner wall of the hydraulic cylinder barrel (14) is provided with a lower boss (141) which is sealed in contact with the outer wall of the base pipe (2); the outer wall of the base pipe (2) is provided with an upper boss (21) which is sealed in contact with the middle part of the inner wall of the hydraulic cylinder barrel (14); the hydraulic cavity is located between the upper boss (21) and the lower boss (141); and the liquid inlet hole (22) is located below the upper boss (21).

3. The mechanical hydraulic double-acting tail pipe suspension sealing device according to claim 2, It is characterized in that A hydraulic pin (143) is connected between the upper end of the inner wall of the hydraulic cylinder (14) and the upper end of the outer wall of the base pipe (2), and during hydraulic sealing operation, the lower boss (141) is away from the upper boss (21).

4. The mechanical hydraulic double-acting tail pipe suspension sealing device according to claim 3, It is characterized in that The outer wall of the base pipe (2) is provided with a positioning locking block (15), and the positioning locking block (15) is located between the hydraulic pin (143) and the upper boss (21). The upper end of the inner wall of the hydraulic cylinder (14) is provided with a locking step (142), and when the hydraulic cylinder (14) moves downward, the locking step (142) engages with the positioning locking block (15).

5. The mechanical hydraulic double-acting tail pipe suspension sealing device according to claim 1, It is characterized in that The upper and lower ends of the hydraulic rubber cylinder (13) are provided with outwardly contracted inclined surfaces, and the lower end of the hydraulic cylinder (14) and the upper end of the extrusion sleeve (6) are both provided with matching inclined surfaces, so that the hydraulic rubber cylinder (13) is embedded between the hydraulic cylinder (14) and the extrusion sleeve (6).

6. The mechanical hydraulic double-acting tail pipe suspension sealing device according to claim 1, It is characterized in that It comprises a plurality of sealing rubber tubes (7) arranged in sequence along the axial direction, and a spacer ring (12) is provided between adjacent sealing rubber tubes (7).

7. The mechanical hydraulic double-acting tail pipe suspension sealing device according to claim 1, It is characterized in that It also comprises a casing short section (8), the upper end of which extends into the lower end opening of the base pipe (2) and is fixedly connected, the lower end of which is connected to the tail pipe (9), and the casing short section (8) passes through the suspension sleeve (3) and the seating sleeve (4).

8. The mechanical hydraulic double-acting tail pipe suspension sealing device according to claim 7, It is characterized in that A stepped hole is provided in the suspension sleeve (3), a limiting step (31) is provided in the middle of the stepped hole, the diameter of the upper end of the stepped hole matches the diameter of the outer wall of the base pipe (2), the diameter of the lower end of the stepped hole matches the diameter of the casing short section (8), the limiting step (31) can abut against the lower end of the base pipe (2) to limit the descending stroke of the base pipe (2); a shear pin (32) is connected between the lower end of the outer wall of the base pipe (2) and the upper end of the inner wall of the suspension sleeve (3), so that there is a descending stroke distance between the lower end of the base pipe (2) and the limiting step (31) before the sealing operation.

9. The mechanical hydraulic double-acting tail pipe suspension sealing device according to any one of claims 1 to 8, It is characterized in that The upper end of the release joint (1) is provided with an internal thread connected to the drill pipe (11), and the lower end of the release joint (1) is provided with an external thread connected to the base pipe (2). The release joint (1) and the base pipe (2) are connected via a reverse thread.

10. A drilling system, It is characterized in that It comprises the mechanical hydraulic double-acting tail pipe suspension sealing device as claimed in any one of claims 1 to 9.

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