A packer-type tailpipe hanger suitable for horizontal wells with small clearances

Abstract

This utility model discloses a packer-type tailpipe hanger suitable for horizontal wells with small gaps, including a packer body, setting slips, a fixing sleeve, a rubber sleeve, a centralizing sleeve, a cone sleeve, a suspension body, setting slips, a hydraulic cylinder, and a centralizing ring. Since the hanger adopts a hydraulic setting and mechanical setting type, and the hanger adopts an integral slip, the setting slips and setting slips are wedged into the inner wall of the outer casing, which plays a two-way locking function, and can achieve permanent sealing, ensuring the sealing ability of the packer after setting and the suspension ability after setting.

Description

Technical Field

[0001] This utility model belongs to the field of cementing and completion technology in oil and gas extraction, specifically relating to a packer-type tailpipe hanger suitable for horizontal wells with small gaps. Background Technology

[0002] In the field of well cementing and completion technology in oil and gas extraction, the use of tailpipe hangers for tailpipe cementing operations can effectively reduce drilling rig load and construction pressure, improve efficiency, and reduce costs. Hydraulic tailpipe hangers achieve mounting by pressurizing and pushing the hanger slips. Currently, commonly used hydraulic tailpipe hangers are difficult to lower into the casing of horizontal wells with small annular gaps, easily causing stuck pipe; in addition, gas leakage is prone to occur in the annulus, affecting the top packer. Utility Model Content

[0003] The purpose of this invention is to provide a packer-type tailpipe hanger suitable for horizontal wells with small gaps, solving the problems of unsmooth installation of hangers and annular air leakage in the prior art, and realizing the smooth installation of tailpipe hangers with small annular gaps to achieve the dual functions of suspension and annular air packing.

[0004] The purpose of this utility model is achieved through the following technical means: a packer-type tailpipe hanger suitable for horizontal wells with small gaps, comprising,

[0005] The packer body has a return sleeve connected to its upper end via an external thread.

[0006] The setting slip is fitted onto the packer body. The upper end of the setting slip is connected to the return sleeve by a thread. The setting slip is equipped with setting shear pins and slip shear pins. The setting slip is fixed to the packer body by the setting shear pins.

[0007] The fixing sleeve is fitted onto the outer circle of the packer body, and the fixing sleeve is fixed to the setting slip by slip clips;

[0008] The rubber sleeve is fitted onto the packer body below the fixed sleeve;

[0009] The straightening sleeve is connected to the packer body below the rubber tube;

[0010] The cone sleeve has its upper end threadedly connected to the packer body and its lower end threadedly connected to the suspension body.

[0011] The suspension body is located below the packer body and is connected to the packer body. The suspension body has pressure transmission holes.

[0012] The seated collet is fitted onto the outer circumference of the suspension unit, with the upper end of the seated collet fitting against the lower end of the cone sleeve.

[0013] The hydraulic cylinder is sleeved on the outer circle of the suspension body and connected to the lower end of the seat clamp via threads. The pressure transmission hole connects the suspension body and the hydraulic cylinder.

[0014] The fixing sleeve has a groove that matches the inner wall of the seat seal.

[0015] The inner wall of the fixed sleeve has a recessed anti-reverse retaining spring groove. The outer circle of the packer body at the anti-reverse retaining spring groove is threaded, and an anti-reverse retaining spring is connected at the threaded part. The anti-reverse retaining spring is located in the anti-reverse retaining spring groove.

[0016] The fixing sleeve is also equipped with a fixing pin. The fixing pin passes through the fixing sleeve and is inserted into the anti-reverse circlip groove. The bottom of the fixing pin contacts the surface of the anti-reverse circlip.

[0017] Both ends of the rubber tube are equipped with rubber tube shoulders that are fitted onto the packer body.

[0018] It also includes a rubber tube support ring, with a groove for installing the rubber tube support ring on the inner side of the rubber tube, and the rubber tube support ring is set in the groove.

[0019] The outer circular surface of the suspension body is also provided with a fixing spring groove, and a fixing spring is provided in the fixing spring groove. The inner wall of the seat plate is also provided with a fixing spring movable groove that matches the fixing spring. The length of the fixing spring movable groove is greater than the length of the fixing spring.

[0020] The surface of the suspension body has several guide grooves, and the hydraulic cylinder has guide holes with guide screws inserted into the guide holes and guide screws inserted into the guide grooves.

[0021] Both the straightening sleeve and the cone sleeve have flow grooves on their surfaces.

[0022] It also includes a centering ring, which is threadedly connected to the outer circle of the suspension body below the hydraulic cylinder.

[0023] The beneficial effects of this utility model are as follows: Since the suspension device adopts a hydraulic seat and mechanical seat type, and the suspension device adopts an integral slip, the seat slip and the seat slip are wedged into the inner wall of the outer sleeve, which plays a two-way locking function, and can achieve permanent sealing, ensuring the sealing ability of the suspension device after seat and the suspension ability after seat. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the packer body;

[0026] Figure 3 This is a schematic diagram of the structure of the suspension body;

[0027] Figure 4This is a schematic diagram of the packer body structure;

[0028] Figure 5 This is a schematic diagram of the seated slip structure;

[0029] Figure 6 This is a schematic diagram of the fixed sleeve structure;

[0030] Figure 7 This is a schematic diagram of the suspension body structure;

[0031] Figure 8 This is a schematic diagram of the seat-mounted clamp structure;

[0032] Figure 9 Side view of the seated kava;

[0033] The components in the diagram are: 1. Return sleeve; 2. Packer body; 3. Setting slip; 4. Setting shear pin; 5. Slip shear pin; 6. Fixing sleeve; 7. Anti-reverse circlip; 8. Fixing pin; 9. Rubber sleeve shoulder; 10. Rubber sleeve; 11. Support ring; 12. Straightening sleeve; 13. Conical sleeve; 14. Guide groove; 15. Suspension body; 16. Setting slip; 17. Fixing circlip; 18. Dustproof sealing ring; 19. O-ring; 20. Hydraulic cylinder; 21. Guide screw; 22. Hydraulic cylinder shear pin; 23. Straightening ring; 24. Pressure transmission hole; 25. Anti-reverse circlip groove; 26. Fixing circlip movable groove.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0035] like Figures 1 to 3 As shown, a packer-type tailpipe hanger suitable for horizontal wells with small clearances includes,

[0036] Packer body 2, with a return sleeve 1 connected to its upper end via an external thread.

[0037] The setting slip 3 is fitted onto the packer body 2. The upper end of the setting slip 3 is connected to the return cylinder 1 by a thread. The setting slip 3 is provided with setting shear pins 4 and slip shear pins 5. The setting slip 3 is fixed to the packer body 2 by setting shear pins 4.

[0038] The fixing sleeve 6 is fitted onto the outer circle of the packer body 2, and the fixing sleeve 6 is fixed to the setting slip 3 by the slip shear pin 5;

[0039] The rubber sleeve 10 is fitted onto the packer body 2 below the fixed sleeve 6;

[0040] The straightening sleeve 12 is connected to the packer body 2 below the rubber tube 10;

[0041] The upper end of the cone sleeve 13 is threaded to the outside of the packer body 2, and the lower end is threaded to the suspension body 15.

[0042] The suspension body 15 is located below the packer body 2 and is connected to the packer body 2. The suspension body 15 has a pressure transmission hole 24.

[0043] The seated collet 16 is fitted onto the outer circumference of the suspension body 15, with the upper end of the seated collet 16 fitting against the lower end of the cone sleeve 13.

[0044] Hydraulic cylinder 20 is sleeved on the outer circle of suspension body 15 and connected to the lower end of seat slip 16 by thread. Pressure transmission hole 24 connects suspension body 15 and hydraulic cylinder 20.

[0045] The centering ring 23 is threadedly connected to the outer circle of the suspension body 15 below the hydraulic cylinder 20.

[0046] like Figure 1 As shown, the upper end of the packer body 2 is connected to the return sleeve 1 by an external thread. The return sleeve 1 is used to cooperate with other accessories during later construction. A sealing ring is also provided between the packer body 2 and the return sleeve 1 for sealing.

[0047] like Figure 4 As shown, a left-hand trapezoidal thread is provided on the inner wall of the upper end of the packer body 2, which is used to connect with the matching tool to send the packer body 2 and the entire packer tailpipe hanger into the wellbore.

[0048] The outer circumference of the packer body 2 is equipped with a setting slip 3, a fixing sleeve 6, a backstop spring 7, a rubber sleeve shoulder 9, a rubber sleeve 10, and a rubber sleeve shoulder 9 from top to bottom. The lower end is connected to the centering sleeve 12 and the cone sleeve 13 through external threads.

[0049] like Figure 5 As shown, the setting slip 3 is fitted onto the upper part of the outer circle of the packer body 2, and its upper end is connected to the return sleeve 1 by an external thread. Specifically, an annular space is left between the outer wall of the packer body 2 and the lower inner wall of the return sleeve 1. The setting slip 3 is provided with setting shear pins 4, and the corresponding packer body 2 also has a recessed setting shear pin groove. The setting slip 3 is fixed to the packer body 2 by the setting shear pins 4. The setting slip 3 is provided with slip shear pins 5, and the setting slip 3 is fixed to the fixing sleeve 6 by the slip shear pins 5. The lower outer side of the setting slip 3 is provided with slip teeth, and the surface of the slip teeth is hardened for biting into the inner wall of the upper sleeve after setting.

[0050] like Figure 6 As shown, the fixing sleeve 6 is inserted between the setting slip 3 and the packer body 2. Since the setting slip 3 needs to open outward, a large part of it does not contact the packer body 2, leaving a lot of space for the fixing sleeve 6 to be inserted. The two are fixed together by the slip clips 5 that pass through them.

[0051] The fixing sleeve 6 has a groove that matches the inner wall of the seat seal 3.

[0052] Furthermore, the outer surface of the fixing sleeve 6 is provided with a groove that matches the inner wall of the setting slip 3, so as to match the arc-shaped inner wall of the setting slip 3 slip tooth.

[0053] The inner wall of the fixed sleeve 6 has a recessed anti-reverse retaining spring groove 25. The outer circle of the packer body 2 at the anti-reverse retaining spring groove 25 is threaded, and an anti-reverse retaining spring 7 is connected at the thread. The anti-reverse retaining spring 7 is located in the anti-reverse retaining spring groove 25.

[0054] The inner wall of the fixed sleeve 6 has an outwardly recessed anti-reverse retaining spring groove 25 to prevent the anti-reverse retaining spring 7 from moving. At the same time, the packer body 2 at the position of the anti-reverse retaining spring 7 is provided with a sawtooth thread. The anti-reverse retaining spring 7 is a sawtooth retaining spring and is fixed to the packer body 2 by the sawtooth thread. In this way, the fixed sleeve 6 will be locked by the anti-reverse retaining spring 7 in the anti-reverse retaining spring groove 25, and the fixed sleeve 6 will not move randomly.

[0055] The fixed sleeve 6 is also provided with a fixing pin 8. The fixing pin 8 passes through the fixed sleeve 6 and is inserted into the anti-reverse spring groove 25. The bottom of the fixing pin 8 is in contact with the surface of the anti-reverse spring 7.

[0056] Furthermore, by passing the fixing pin 8 through the fixing sleeve 6 until it contacts the anti-reverse retaining spring 7, the fixing pin 8 is tightened, and the bottom presses the anti-reverse retaining spring 7 onto the surface of the packer body 2, further securing the anti-reverse retaining spring 7.

[0057] Both ends of the rubber tube 10 are provided with rubber tube shoulders 9 that are fitted onto the packer body 2.

[0058] It also includes a rubber tube support ring 11, and a groove for installing the rubber tube support ring 11 is opened on the inner side of the rubber tube 10. The rubber tube support ring 11 is set in the groove.

[0059] The rubber sleeve shoulder 9 is fitted onto the packer body 2 and is located on the upper and lower sides of the rubber sleeve 10 to protect the rubber sleeve 10 and prevent damage.

[0060] The rubber sleeve 10 is made of saturated hydrogenated nitrile rubber material, which expands on the upper casing after compression and is used to seal between the upper casing and the packer body 2 after it is run into the wellbore.

[0061] The straightening sleeve 12 is fixed to the lower part of the packer body 2 by internal thread. The outside of the straightening sleeve 12 is milled with a flow groove. The outer diameter of the straightening sleeve 12 is larger than that of the rubber sleeve 10, which is used to protect the rubber sleeve 10. The straightening packer body 2 is located in the center of the upper sleeve.

[0062] The cone sleeve 13 is connected to the packer body 2 at its upper end via an internal thread and to the hanger body 15 at its lower end via an internal thread. It is used to fix the packer body 2 and the hanger body 15. The outer surface of the cone sleeve 13 has a recessed flow groove to allow bottom hole fluid to pass through it. The lower end of the cone sleeve 13 has a conical surface for contact with the conical surface of the mounting slip 16. O-rings 19 are provided between the packer body 2 and the cone sleeve 13, and between the hanger body 15 and the cone sleeve 13, to seal the connections.

[0063] like Figure 7 As shown, the suspension body 15 is connected to the packer body 2. A pressure transmission hole 24 is opened on the side wall of the suspension body 15, which connects the interior of the suspension body 15 and the liquid cylinder 20, so that liquid can enter the liquid cylinder 20 from the hole.

[0064] like Figure 8 and Figure 9 As shown, the seated slip 16 is an integral design, with the slip tooth side near the cone sleeve 13. The cone surface under the slip tooth is consistent with the cone surface of the cone sleeve 13, allowing the seated slip 16 to fit snugly against the cone surface of the cone sleeve 13. The slip tooth surface is hardened for fastening to the inner wall of the upper sleeve. The lower end of the seated slip 16 is connected to the hydraulic cylinder 20 via threads. A groove is provided in the inner hole at the lower end of the seated slip 16 for installing the dustproof sealing ring 18, thereby preventing impurities in the mud from entering between the hydraulic cylinder 20 and the hanger body 15 and affecting the upward movement of the hydraulic cylinder 20.

[0065] The hydraulic cylinder 20 is fitted onto the outer circumference of the hanger body 15; its upper end is connected to the seat clamp 16 by threads; the hydraulic cylinder 20 has shear pin holes on its tube body, and the hydraulic cylinder 20 is fixed to the hanger body 15 by hydraulic cylinder shear pins 22; an O-ring 19 is provided between the hydraulic cylinder 20 and the hanger body 15, and the O-ring 19 is located at the upper and lower ends of the pressure transmission hole 24 of the hanger body 15, which serves as a seal; the internal pressure can be applied to the hydraulic cylinder 20 through the pressure transmission hole 24.

[0066] The centralizing ring 23 is fixed to the hanger body 15 by threads; the outer circle of the centralizing ring 23 is milled with a flow groove to allow the bottom fluid to pass through the flow groove.

[0067] The outer circular surface of the suspension body 15 is also provided with a fixing spring groove, and a fixing spring 17 is provided in the fixing spring groove. The inner wall of the seat plate 16 is also provided with a fixing spring movable groove 26 that matches the fixing spring 17. The length of the fixing spring movable groove 26 is greater than the length of the fixing spring 17.

[0068] The retaining circlip 17 is installed in the retaining circlip groove and protrudes from the outer circumference of the suspension body 15. Correspondingly, the inner wall of the seat clasp 16 has a recessed retaining circlip movable groove 26 to accommodate the protruding retaining circlip 17. When the hydraulic cylinder 20 moves upward, i.e. Figure 1When the cylinder moves to the left, the right end of the movable groove 26 of the fixed snap ring is blocked by the fixed snap ring 17, thereby limiting the maximum upward position of the hydraulic cylinder 20.

[0069] The surface of the suspension body 15 has several guide grooves 14, and the hydraulic cylinder 20 has a guide hole. A guide screw 21 is inserted into the guide hole and inserted into the guide groove 14.

[0070] To further limit and guide the movement of the hydraulic cylinder 20, several recessed guide grooves 14 are opened on the surface of the suspension body 15, and guide holes are opened on the surface of the hydraulic cylinder 20. Guide screws 21 are threaded into the guide holes and their lower ends are inserted into the guide grooves 14. In this way, when the hydraulic cylinder 20 moves, it will move along the direction of the guide grooves 14 because of the guide screws 21. When the guide screws 21 move to the top of the guide grooves 14, they will be stuck by the guide grooves and cannot move any further.

[0071] Both the straightening sleeve 12 and the cone sleeve 13 have flow grooves on their surfaces.

[0072] The specific workflow is as follows: This hanger is connected to the cementing string. When it needs to be seated, the pipe is pressurized, and high-pressure liquid enters the hydraulic cylinder 20 through the pressure transmission hole 24 on the hanger body 15. When the pressure rises to the shearing pressure of the hydraulic cylinder shear pin 22, the hydraulic cylinder shear pin 22 between the hydraulic cylinder 20 and the hanger body 15 is sheared, pushing the hydraulic cylinder 20 and the seating slip 16 upward together. The upper end of the seating slip 16 moves upward on the conical surface of the conical sleeve 13 and weds tightly between the entire hanger and the outer casing downhole. At this time, once lowered, the entire tailpipe is seated on the inner wall of the outer casing.

[0073] After the suspension body 15 is seated, the lowering sleeve 1 is pressed back. When the downward pressure reaches the shearing force of the setting shear pin 4, the setting shear pin 4 between the setting slip 3 and the packer body 2 is cut off. At this time, the slip shear pin 5 has not yet broken off, and the setting slip 3 and the fixing sleeve 6 are still connected together. The setting slip 3, the fixing sleeve 6, and the anti-reverse spring 7 inside the fixing sleeve 6 move down together under the action of the downward pressure, pushing the lower rubber sleeve 10 to deform and expand to the inner wall of the outer sleeve under the action of the internal support ring 11.

[0074] Because the anti-reverse retaining ring 7 is a sawtooth retaining ring, and the thread on the packer body 2 that matches the anti-reverse retaining ring is a sawtooth thread, the anti-reverse retaining ring 7 can move downwards, but cannot move back up after moving downwards. After moving downwards, the anti-reverse retaining ring 7 is locked onto the packer body 2, ensuring the sealing effect after the rubber sleeve 10 expands.

[0075] As the pressure continues to decrease, when the pressure reaches the shearing force of the slip shear pin 5, the slip shear pin 5 between the setting slip 3 and the fixing sleeve 6 is sheared off. The setting slip 3 then descends and weds tightly between the packer body 2 and the outer sleeve. At this point, the setting slip 3, the hanging slip 16, and the rubber sleeve 10 are all permanently fixed to the inner wall of the outer sleeve, ensuring the function of the setting and suspension device.

Claims

1. A packer-type tailpipe hanger suitable for horizontal wells with small clearances, characterized in that: include, Packer body (2), the upper end of packer body (2) is connected to return cylinder (1) by external thread. The setting slip (3) is fitted onto the packer body (2). The upper end of the setting slip (3) is connected to the return cylinder (1) by a thread. The setting slip (3) is provided with a setting shear pin (4) and a slip shear pin (5). The setting slip (3) is fixed to the packer body (2) by the setting shear pin (4). The fixing sleeve (6) is fitted onto the outer circle of the packer body (2), and the fixing sleeve (6) is fixed to the setting slip (3) by the slip shear pin (5); The rubber sleeve (10) is fitted onto the packer body (2) below the fixed sleeve (6); The straightening sleeve (12) is connected to the packer body (2) below the rubber tube (10); The upper end of the cone sleeve (13) is connected to the outside of the packer body (2) by a thread, and the lower end is connected to the suspension body (15) by a thread. The suspension body (15) is located below the packer body (2) and is connected to the packer body (2). The suspension body (15) has a pressure transmission hole (24). The seated clamp (16) is fitted onto the outer circle of the suspension body (15), with the upper end of the seated clamp (16) fitting against the lower end of the cone sleeve; The hydraulic cylinder (20) is sleeved on the outer circle of the suspension body (15) and connected to the lower end of the seat clamp (16) by a thread. The pressure transmission hole (24) connects the suspension body (15) and the hydraulic cylinder (20).

2. A packer-type tailpipe hanger suitable for small-clearance horizontal wells according to claim 1, characterized in that: The fixing sleeve (6) has a groove that matches the inner wall of the seat seal (3).

3. A packer-type tailpipe hanger suitable for small-clearance horizontal wells according to claim 1, characterized in that: The inner wall of the fixed sleeve (6) has a recessed anti-reverse retaining spring groove (25). The outer circle of the packer body (2) at the anti-reverse retaining spring groove (25) is threaded, and an anti-reverse retaining spring (7) is connected at the thread. The anti-reverse retaining spring (7) is located in the anti-reverse retaining spring groove (25).

4. A packer-type tailpipe hanger suitable for small-clearance horizontal wells according to claim 3, characterized in that: The fixed sleeve (6) is also provided with a fixed pin (8). The fixed pin (8) passes through the fixed sleeve (6) and is inserted into the anti-reverse spring groove (25). The bottom of the fixed pin (8) is in contact with the surface of the anti-reverse spring (7).

5. A packer-type tailpipe hanger suitable for small-clearance horizontal wells according to claim 1, characterized in that: Both ends of the rubber tube (10) are provided with rubber tube shoulders (9) that are fitted onto the packer body (2).

6. A packer-type tailpipe hanger suitable for small-clearance horizontal wells according to claim 1, characterized in that: It also includes a rubber tube support ring (11), and the rubber tube (10) has a groove for installing the rubber tube support ring (11) on its inner side, and the rubber tube support ring (11) is set in the groove.

7. A packer-type tailpipe hanger suitable for small-clearance horizontal wells according to claim 1, characterized in that: The outer circular surface of the suspension body (15) is also provided with a fixing spring groove, and a fixing spring (17) is provided in the fixing spring groove. The inner wall of the seat plate (16) is also provided with a fixing spring movable groove (26) that matches the fixing spring (17). The length of the fixing spring movable groove (26) is greater than the length of the fixing spring (17).

8. A packer-type tailpipe hanger suitable for small-clearance horizontal wells according to claim 1, characterized in that: The surface of the suspension body (15) has several guide grooves (14), and the hydraulic cylinder (20) has a guide hole. A guide screw (21) is inserted into the guide hole and the guide screw (21) is inserted into the guide groove (14).

9. A packer-type tailpipe hanger suitable for small-clearance horizontal wells according to claim 1, characterized in that: Both the straightening sleeve (12) and the cone sleeve (13) have flow grooves on their surfaces.

10. A packer-type tailpipe hanger suitable for small-clearance horizontal wells according to claim 1, characterized in that: It also includes a centering ring (23), which is threadedly connected to the outer circle of the suspension body (15) below the hydraulic cylinder (20).

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