CN111946281B

CN111946281B - Liner hanger

Info

Publication number: CN111946281B
Application number: CN202010786989.9A
Authority: CN
Inventors: 臧传贞; 姜汉桥; 李俊键; 穆总结; 张宝瑞; 贾洪革; 李爽; 徐茂雅; 孙照伟; 宋雷
Original assignee: China University of Petroleum Beijing
Current assignee: China University of Petroleum Beijing
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2022-04-29
Anticipated expiration: 2040-08-07
Also published as: CN111946281A

Abstract

The present specification provides a liner hanger comprising: the liquid inlet device comprises a body with a ball seat and a liquid inlet flow channel, wherein the body is provided with a first end and a second end which are opposite in the lengthwise extension direction, and the second end is provided with a boss protruding outwards; establish the dabber on the body at the cover, the inboard of dabber is provided with: the opening is connected with the liquid inlet flow channel, and the limiting part is used for limiting the boss; the force application part is sleeved outside the mandrel, and a stopping part for limiting the force application part is arranged on the outer side of the mandrel; the slips are arranged outside the body and can move along the force application piece in the radial direction of the body; when the slip is set, the force application piece moves towards the second end under the pushing of liquid until the force application piece is abutted to the stopping portion, when the slip is set, the body is lifted, the boss is matched with the limiting portion and then can drive the mandrel and the force application piece to move upwards, and the slip returns. The liner hanger provided by the specification can be unlocked after setting, and is simple to operate.

Description

Liner hanger

Technical Field

The specification relates to the technical field of well completion operation of oil and gas fields, in particular to a liner hanger.

Background

Liner hangers are of great importance in field development. With the continuous deepening of the development of oil and gas resources, the application of the liner hanger is more and more extensive, and for example, in the technical fields of profile control and water shutoff, staged fracturing, layered oil extraction and the like, the liner hanger is required to carry out the hanging operation of a lower completion string and be used as a later oil production string to realize the exploitation operation of the oil and gas resources.

In the prior art, a liner hanger is designed in a permanent mechanical structure, and the action principle of the liner hanger is that a ball-throwing pressure-building mode is adopted to realize the sitting and hanging of a slip of the liner hanger. Due to the permanent mechanical design, the well completion and downhole operation are carried out subsequently, for example, the drift diameter of a shaft is small, so that the well repair operation cannot be carried out at the later stage; the permanent design causes the related well completion operation to be one-time engineering, and the defects that the failure of the well completion operation cannot be recovered and the like are overcome. The defects cause the technical problems of increased risk of well completion operation, greatly increased subsequent well repair cost and the like.

Disclosure of Invention

To address at least one of the technical problems of the prior art, the present specification provides a liner hanger capable of trip release.

In order to achieve the above object, the technical solutions provided in the present specification are as follows:

a liner hanger comprising:

the liquid inlet device comprises a body with a ball seat and a liquid inlet flow channel, wherein the body is provided with a first end and a second end which are opposite in the lengthwise extension direction, and the second end is provided with a boss protruding outwards;

the cover is established dabber on the body, the inboard of dabber is provided with: the opening is connected with the liquid inlet flow channel, and the limiting part is used for limiting the lug boss;

the force application part is sleeved outside the mandrel, and a stopping part for limiting the force application part is arranged on the outer side of the mandrel;

a plurality of slips disposed outside the body, the plurality of slips being movable along the force applying member in a radial direction of the body;

when the slip is set, the force application piece moves towards the second end under the pushing of liquid until the force application piece is abutted to the stopping portion, when the slip is set, the body is lifted, the boss is matched with the limiting portion and then can drive the mandrel and the force application piece to move upwards, and the slip returns.

As a preferred embodiment, the method further comprises: the outer barrel is sleeved on the outer side of the mandrel and fixedly connected with the mandrel, the outer barrel is connected with the body through a first pin mechanism, a cavity for containing the force application part is formed between the outer barrel and the mandrel, the force application part is provided with a locking mechanism for limiting the direction of the force application part towards the movement of the first end, and the locking mechanism is arranged between the outer barrel and the force application part.

As a preferred embodiment, the liner hanger further comprises: the taper sleeve is sleeved at the second end of the body and matched with the slips, a first clamping part is arranged on the taper sleeve, the mandrel is connected with a clamping jaw capable of contracting inwards, a second clamping part is arranged on the clamping jaw, and the boss can apply expansion force to the clamping jaw to clamp the first clamping part and the second clamping part;

when the taper sleeve is unsealed, the lug boss moves upwards along with the body, the clamping jaws contract inwards to enable the first clamping portion and the second clamping portion to be separated, and the taper sleeve moves downwards.

As a preferred embodiment, the lock mechanism includes: a plurality of locking teeth disposed on the force applying member; the locking half ring is connected between the outer barrel and the force application part and provided with a first side close to the force application part and a second side close to the outer barrel, one-way thread teeth clamped with the plurality of locking teeth are arranged on the first side, and a movable gap is formed between the second side and the outer barrel.

As a preferred embodiment, the liner hanger further comprises: the slip sleeve is arranged outside the body in a sleeved mode, square holes for the slips to stretch out are formed in the slip sleeve, the slip sleeve is connected with the force application piece through a second pin mechanism, and the shearing strength of the second pin mechanism is smaller than that of the first pin mechanism.

In a preferred embodiment, the force applying member has an inverted conical surface, the slip has a first inclined surface that mates with the inverted conical surface, the taper sleeve has an outer conical surface, and the slip has a second inclined surface that mates with the outer conical surface.

As a preferred embodiment, the plurality of slips are spaced apart in a circumferential direction of the body, and the slips include: the slip comprises an upper slip and a lower slip which are connected, wherein the upper slip is provided with a plurality of upper slip teeth, the lower slip is provided with a plurality of lower slip teeth, and the orientation of the upper slip teeth is opposite to that of the lower slip teeth.

As a preferred embodiment, the force applying member includes: the slip segment with the inverted cone-shaped surface and the connecting segment connected with the slip sleeve are arranged, a first annular cavity is formed between the slip segment and the mandrel, the stopping portion is fixed in the first annular cavity, and a limiting step is formed at the transition position of the slip segment and the connecting segment.

As a preferred embodiment, a second annular cavity for the boss to move is formed between the jaw and the body, the position where the mandrel and the jaw are in transition forms the limiting part, and the boss and the limiting part are arranged at an interval.

In a preferred embodiment, sealing rings are disposed between the body and the mandrel, between the mandrel and the outer tube, between the urging member and the mandrel, and between the urging member and the outer tube.

Has the advantages that:

the liner hanger provided by the specification can realize reliable suspension of the underground liner by pressing the liner hanger on the ground, and after setting, the force application piece can abut against the stop part on the mandrel. When the well completion operation needs to be performed, the body is lifted upwards, and then the mandrel and the force application piece are driven to move upwards through the boss on the body, so that the slips return along the force application piece, the stuck releasing and recovering are completed, and the effective performance of the well completion operation is ensured.

Specific embodiments of the present specification are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the specification may be employed. It should be understood that the embodiments of the present description are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present specification, and other drawings can be obtained by those skilled in the art without inventive labor.

FIG. 1 is a half sectional view of a liner hanger provided in accordance with an embodiment of the present disclosure;

FIG. 2 is a semi-sectional view of a liner hanger provided in accordance with an embodiment of the present disclosure as it is run into a well;

FIG. 3 is a half sectional view of a liner hanger provided in accordance with an embodiment of the present disclosure in set;

FIG. 4 is a half cross-sectional view of a liner hanger with a first pin mechanism sheared according to embodiments of the present disclosure;

FIG. 5 is a semi-sectional view of the mandrel and the force application member traveling up simultaneously with the unset of the liner hanger provided by embodiments of the present disclosure;

FIG. 6 is a semi-sectional view of the liner hanger shown in an embodiment of the present disclosure shown as running down the drogue when the liner hanger is unset;

FIG. 7 is a sectional view taken along line A-A of FIG. 1;

FIG. 8 is a sectional view taken along line B-B of FIG. 1;

FIG. 9 is an enlarged view of a portion of FIG. 2 at A;

fig. 10 is a partially enlarged view of fig. 2 at B.

The reference numbers illustrate:

1. mounting a coupling; 2. a body; 21. a first end; 22. a second end; 23. a boss; 24. a liquid inlet hole; 3. a first pin mechanism; 4. an outer cylinder; 5. a mandrel; 51. a limiting part; 52. a claw; 521. a second engaging portion; 53. opening a hole; 54. a second ring cavity; 6. a force application member; 63. a limiting step; 64. a first ring cavity; 7. locking the semi-ring; 71. one-way thread teeth; 72. a clearance for movement; 73. locking teeth; 8. a second pin mechanism; 9. a slip sleeve; 10. a stopper portion; 11. slips; 101. the slips are put on; 102. a slip is put down; 12. a taper sleeve; 121. a first engaging portion; 13. and (5) lowering the coupling.

Detailed Description

While the invention will be described in detail with reference to the drawings and specific embodiments, it is to be understood that these embodiments are merely illustrative of and not restrictive on the broad invention, and that various equivalent modifications can be effected therein by those skilled in the art upon reading the disclosure.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The liner hanger of the present embodiment will be explained and illustrated with reference to fig. 1 to 10. For convenience of description, in the embodiments of the present specification, the same reference numerals are used for the same components. And for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments, and the descriptions of the same components may be mutually referred to and cited.

Specifically, an upward direction illustrated in fig. 1 to 10 is defined as "up", and a downward direction illustrated in fig. 1 to 10 is defined as "down". It should be noted that the definitions of the directions in the present specification are only for convenience of describing the technical solutions of the present specification, and do not limit the directions of the liner hanger of the embodiments of the present specification in other scenarios, including but not limited to use, testing, transportation, and manufacturing, which may cause the orientation of the device to be reversed or the position of the device to be changed.

As shown in fig. 1-10, the present specification provides a liner hanger comprising: a body 2 having a ball seat and a liquid inlet flow passage, the body 2 having opposite first and second ends 21 and 22 in a longitudinal extension direction thereof, the second end 22 being provided with a boss 23 protruding outwardly; the cover is established dabber 5 on the body 2, the inboard of dabber 5 is provided with: an opening 53 connected with the liquid inlet flow passage and a limiting part 51 used for limiting the lug boss 23; the force application part 6 is sleeved outside the mandrel 5, and a stopping part 10 used for limiting the force application part 6 is arranged on the outer side of the mandrel 5; a plurality of slips 11 provided outside the body 2, the plurality of slips 11 being movable along the force applying member 6 in a radial direction of the body 2; when the sealing device is set, the force application piece 6 moves towards the second end 22 under the pushing of liquid until the force application piece abuts against the stopping part 10, when the sealing device is unsealed, the body 2 is lifted, the boss 23 is matched with the limiting part 51 and then can drive the mandrel 5 and the force application piece 6 to move upwards, and the slip 11 returns.

The liner hanger provided by the specification can realize reliable suspension of the underground liner by pressing the liner hanger on the ground, and after setting, the force application piece 6 can abut against the stopping part 10 on the mandrel 5. When the deblocking is needed, the body 2 is lifted upwards, the mandrel 5 and the force application piece 6 are driven to move upwards through the boss 23 on the body 2, so that the slips 11 return along the force application piece 6, the stuck releasing and recovering are completed, and the effective operation of well completion operation is ensured.

In particular, the body 2 is substantially hollow and tubular, having a first end 21 (shown on the top) and a second end 22 (shown on the bottom) opposite to each other in the longitudinal extension thereof. The first end 21 is connected to an upper collar 1 for connection to an upper string of tubulars and the second end 22 is connected to a lower collar 13 for connection to a lower liner or other tubular string.

The mandrel 5 is sleeved outside the body 2, and the mandrel 5 is provided with an opening 53 connected with the liquid inlet flow channel. In a particular embodiment, a groove extending lengthwise is provided between the first end 21 and the second end 22 of the body 2. The body 2 is provided with a liquid inlet hole 24 at the groove, so that the liquid inlet hole is connected with the hollow cavity of the body 2 to form a liquid inlet flow passage. The force application member 6 is sleeved outside the mandrel 5 and located below the opening 53, and when a sealing ball is dropped from the ground and seated on a ball seat (not shown), pressure liquid is pumped into the body 2, and the pressure liquid can enter the opening 53 through the liquid inlet flow channel to push the force application member 6 to move towards the second end 22 (below) of the body.

A plurality of slips 11 are provided outside the body 2 and below the urging member 6. The slips 11 are arranged at intervals in the circumferential direction of the body 2. The number of slips 11 is not particularly limited in this application, and may be three, five or more slips 11.

In this specification, the liner hanger further comprises: urceolus 4, urceolus 4 cover establish in the dabber 5 the outside and with 5 fixed connection of dabber, urceolus 4 through first pin mechanism 3 with body 2 is connected, urceolus 4 with be formed with between the dabber 5 and be used for holding the cavity of application of force piece 6, application of force piece 6 with be provided with between the urceolus 4 and be used for the restriction application of force piece 6 orientation the locking mechanical system of first end 21 motion.

The outer cylinder 4 can be sleeved above the body 2 and is fixedly connected with the body 2 through the first pin mechanism 3. The outer cylinder 4 and the mandrel 5 can be fixed in a threaded connection manner. Specifically, the inner side of the outer cylinder 4 is provided with an internal thread, and the upper part of the mandrel 5 is provided with an external thread matched with the internal thread. The urging member 6 is interposed between the outer cylinder 4 and the spindle 5, so that the urging member 6 is movable between the outer cylinder 4 and the spindle 5. A locking mechanism for limiting the movement of the force applying member 6 towards the first end 21 of the body 2 is provided between the outer cylinder 4 and the force applying member 6, but the locking mechanism can allow the force applying member 6 to move towards the second end 22 of the body 2.

In this specification, the liner hanger further comprises: the cover is established the outside slip cover 9 of body 2, be provided with the confession on the slip cover 9 the square hole that slips 11 stretches out, slip cover 9 with connect through second pin mechanism 8 between the application of force piece 6, the shear strength of second pin mechanism 8 is less than first pin mechanism 3 to when suppressing, when the intensity of driving into pressure fluid is greater than the shear strength of second pin mechanism 8, can cut second pin mechanism 8, promote the motion of application of force piece 6, make slips 11 can be along the radial motion of the surface of application of force piece 6 at body 2, realize the seat and seal.

In a specific embodiment, as shown in fig. 9, the locking mechanism comprises: a plurality of lock teeth 73 provided on the urging member 6; the locking half ring 7 is connected between the outer cylinder 4 and the force application member 6, the locking half ring 7 has a first side close to the force application member 6 and a second side close to the outer cylinder 4, the first side is provided with one-way thread teeth 71 engaged with the plurality of locking teeth 73, and a movable gap 72 is arranged between the second side and the outer cylinder 4.

In the present embodiment, a locking half ring 7 is provided between the outer cylinder 4 and the force application member 6, so that the outer cylinder 4 and the force application member 6 are connected in the axial direction by the locking half ring 7. The plurality of locking teeth 73 of the forcing member 6 are located above the locking half ring 7, so that when the forcing member 6 moves towards the second end 22 of the body, the plurality of locking teeth 73 of the forcing member 6 are engaged with the plurality of one-way threads 71 of the locking half ring 7, and the locking teeth 73 can move downwards along the axial direction of the plurality of one-way threads 71 and cannot move upwards, that is, the forcing member 6 can move downwards along the locking half ring 7 and cannot move upwards along the locking half ring 7. The locking semi-ring 7 can effectively prevent the phenomenon of unfreezing caused by the shrinkage of the slips 11 after the ground is decompressed. A movable gap 72 is provided between the locking half ring 7 and the outer cylinder 4, and when the force applying member 6 moves towards the second end 22 of the body 2, the outer cylinder 4 can axially limit the locking half ring 7 through the movable gap 72, and further lock the force applying member 6. Furthermore, a latch may be disposed on the second side of the locking half ring 7, and an internal tooth matched with the latch is disposed on the outer cylinder 4, and the movable gap 72 is provided between the latch and the internal tooth.

In a particular embodiment, as shown in figures 7 and 8, the outer barrel 4 is connected to the body 2 by a first pin mechanism 3. The first pin mechanism 3 may be composed of eight shear pins arranged at equal intervals in the circumferential direction of the body 2. The slip sleeve 9 is connected with the force application member 6 through a second pin mechanism 8. The second pin mechanism 8 may also consist of a plurality of shear pins. The number of the shearing pins in the second pin mechanism 8 can be three, four, five or other numbers, and the specific number of the shearing pins needs to be adjusted according to the hydraulic pressure, but needs to be smaller than the number of the first pin mechanisms 3 so as to ensure that the shearing strength of the second pin mechanism 8 is smaller than that of the first pin mechanisms 3.

In this specification, the liner hanger further comprises: the taper sleeve 12 is sleeved at the second end 22 of the body 2 and matched with the slip 11, a first clamping portion 121 is arranged on the taper sleeve 12, the mandrel 5 is connected with a clamping jaw 52 capable of contracting inwards, a second clamping portion 521 is arranged on the clamping jaw 52, and the boss 23 can apply expansion force to the clamping jaw 52 to enable the first clamping portion 121 and the second clamping portion 521 to be clamped; when unsealing is performed, the boss 23 moves upwards along with the body 2, the claws 52 contract inwards to separate the first clamping part 121 from the second clamping part 521, and the taper sleeve 12 moves downwards.

Specifically, as shown in fig. 10, the taper sleeve 12 is clamped between the body 2 and the slip sleeve 9, and the taper sleeve 12 can be matched with the slips 11 to realize setting. The lower end of the mandrel 5 is provided with jaws 52 which can be retracted inwardly. Since the second end of the body 2 is provided with an outwardly protruding boss 23, the boss 23 can apply an expanding force to the jaws to expand the jaws 52. The claw 52 is provided with a first clamping part 121, the inner side of the taper sleeve 12 is provided with a second clamping part 521, one of the first clamping part 121 and the second clamping part 521 is a convex part, the other one is a concave part, and the first clamping part 121 and the second clamping part 521 form a clamping mechanism after being matched, so that the taper sleeve 12 is connected with the mandrel 5. Because the mandrel 5 is fixedly connected with the outer barrel 4, the outer barrel 4 is fixed with the body 2 through the first pin mechanism 3.

When setting, the taper sleeve 12 can perform axial limit through the clamping mechanism and is matched with the slips 11 to complete setting. When unsealing is carried out, as shown in fig. 4, 5 and 6, the body 2 is lifted upwards, the body 2 causes the first pin mechanism 3 to be sheared under the action of the lifting force, and the body 2 can move upwards relative to the mandrel 5 and the outer cylinder 4 which are sleeved outside the body. When the boss 23 moves upwards along with the body 2, the claw 52 is contracted inwards due to the loss of the expansion force applied by the boss 23, so that the first clamping part 121 is separated from the second clamping part 521, the taper sleeve 12 moves downwards, and the releasing is completed. Because the lower coupling 13 is arranged below the body 2, the lower coupling 13 can receive the downward taper sleeve 12, and the taper sleeve 12 is prevented from falling into the well.

In a specific embodiment, the claw 52 is provided with a clamping platform, which is a first clamping portion 121, and the interior of the taper sleeve 12 is provided with a clamping groove, which is a second clamping portion 521.

In one embodiment, the force applying member 6 has an inverted conical surface, the slip 11 has a first inclined surface that mates with the inverted conical surface, the taper sleeve 12 has an outer conical surface, and the slip 11 has a second inclined surface that mates with the outer conical surface.

In this embodiment, the tapered surfaces of the biasing member 6 and the taper sleeve 12 are in contact with the slips 11. When the force application member 6 moves downwards along the axial direction of the mandrel 5, the inverted conical surface of the force application member 6 abuts against the first inclined surface of the slips 11, so that the slips 11 gradually get away from the mandrel 5 and extend outwards in the radial direction, and at the moment, the second inclined surface of the slips 11 slides on the outer conical surface of the taper sleeve 12. In the present embodiment, the inclination angles of the first slope and the second slope are both 15 ° to 18 °.

In one embodiment, as shown in fig. 2 and 3, the force applying member 6 includes: the slip segment is provided with the inverted cone-shaped surface, and the connecting segment is connected with the slip sleeve 9, a first annular cavity 64 is formed between the slip segment and the mandrel 5, the stopping portion 10 is fixed in the first annular cavity 64, and a limiting step 63 is formed at the transition position of the slip segment and the connecting segment.

Specifically, the surface of the sliding section abuts against the first inclined surface of the slip 11, and a limit step is formed between the inner side of the sliding section and the connecting section. When the force applying member 6 moves during setting, the limiting step 63 gradually approaches the stopping portion 10 until the limiting step abuts against the stopping portion 10, so that the force applying member 6 is prevented from moving to the second end 22. When the core shaft 5 moves upwards along with the body 2, the force application piece 6 which is abutted against the stopping part 10 moves upwards along with the core shaft 5 in the process of unlocking, and the first inclined surface of the slip 11 retracts along the inverted conical surface of the sliding section. Preferably, the stop portion 10 may be composed of two half rings buckled together, and the core shaft 5 may be provided with an annular groove for being clamped into the half rings.

In one embodiment, a second annular cavity 54 for the boss 23 to move is formed between the claw 52 and the body 2, the position where the mandrel 5 and the claw 52 transition forms the limiting portion 51, and the boss 23 and the limiting portion 51 are arranged at a distance. When the body 2 is lifted up, as shown in fig. 5, the stopper 51 of the mandrel 5 is spaced from the boss 23 of the body 2, so that the first pin mechanism 3 between the outer cylinder 4 and the body 2 is sheared by the pressure difference between the lifting force and the gravity, and after the shearing, the boss 23 moves upward, and the mandrel 5 and the outer cylinder 4 disconnected from the body 2 move downward until the boss 23 abuts against the stopper 51. At this time, the body 2 is continuously lifted, the boss 23 drives the mandrel 5, the outer cylinder 4 and the force application member 6 abutting against the stopping portion 10 to move upwards together, and unsealing is completed.

In one embodiment, the plurality of slips 11 are spaced apart circumferentially of the body 2, the slips 11 comprising: an upper slip 101 and a lower slip 102 connected, the upper slip 101 having a plurality of upper slip teeth, the lower slip 102 having a plurality of lower slip teeth, the upper slip teeth being oriented opposite the lower slip teeth.

In this embodiment, the slips 11 include an upper slip 101 and a lower slip 102 connected together, the upper slip 101 and the lower slip 102 may be integrally formed, the upper slip 101 having a plurality of upper slip teeth, the lower slip 102 having a plurality of lower slip teeth, the upper slip teeth being oriented opposite the lower slip teeth. In a specific embodiment, a plurality of upper slip teeth of the upper slip 101 may be disposed obliquely toward a lower side of the body 2, and a plurality of lower slip teeth of the lower slip 102 may be disposed obliquely toward an upper side of the body 2. Of course, in other embodiments, the upper slip teeth of the upper slip 101 may be inclined toward the upper side of the body 2, and the lower slip teeth of the lower slip 102 may be inclined toward the lower side of the body 2, as long as the upper slip teeth are oriented opposite to the lower slip teeth. The slips 11 adopting the design structure can ensure that the axial locking of the liner hanger and the casing is stable.

Correspondingly, square holes in the slip sleeve 9 are arranged at intervals along the circumferential direction of the body 2, and the number of the square holes is the same as that of the slips 11. The square holes may include upper and lower holes spaced up and down corresponding to the shape of the slips 11, and the upper slips 101 are radially movably inserted into the upper holes while the lower slips 102 are radially movably inserted into the lower holes.

In the present specification, seal rings are provided between the body 2 and the mandrel 5, between the mandrel 5 and the outer tube 4, between the urging member 6 and the mandrel 5, and between the urging member 6 and the outer tube 4.

Specifically, above the liquid inlet hole 24, a static seal may be formed between the body 2 and the mandrel 5 by a plurality of seal rings, so as to seal a gap between the body 2 and the mandrel 5. A plurality of sealing rings are arranged above the opening 53 of the mandrel 5 and between the mandrel 5 and the outer cylinder 4 to form static seal; below the opening 53 of the mandrel 5, a plurality of sealing rings are formed between the mandrel 5 and the body 2 to form a static seal. The sealing rings may be O-ring seals for sealing the gap between the upper part of the mandrel 5 and the outer cylinder 4 and between the lower part of the mandrel 5 and the body 2. In addition, sealing rings are arranged between the force application piece 6 and the outer cylinder 4 and between the force application piece 6 and the mandrel 5 to form dynamic sealing, so that in the process of axial movement between the force application piece 6 and the mandrel 5 and the outer cylinder 4, the sealing state between the force application piece 6 and the outer wall of the mandrel 5 and the inner wall of the outer cylinder 4 can be kept constantly, and liquid leakage is prevented.

For a better understanding of the present application, the operation of the liner hanger provided by the embodiments of the present disclosure will be further described with reference to fig. 1 to 10.

The liner hanger is installed on the completion string as a part of the completion string, the whole completion string is lowered to a designed well depth position according to a designed position, and after the lowering of the string is completed, a sealing ball is thrown into the ground and is seated on a ball seat (not shown in the figure), and then the ground is pressed. During the pressing operation, high-pressure fluid flows into the liquid inlet hole 24 through the body 2, passes through the groove between the mandrel 5 and the body 2, and then passes through the opening 53 on the mandrel 5 and the cavity between the outer barrel 4 and the mandrel 5. Under the action of high-pressure fluid, the second pin mechanism 8 is sheared, the high-pressure fluid pushes the force application member 6 to move axially and downwards, and the slips 11 are driven to extend outwards along the conical inclined surfaces of the force application member 6 and the taper sleeve 12 in the radial direction and are firmly clamped on the inner wall of the outer casing.

That is, in the state that the high-pressure fluid is injected into the body 2, the high-pressure fluid flows into the space among the mandrel 5, the outer cylinder 4 and the force application member 6 through the liquid inlet hole 24 and the opening 53 on the mandrel 5 to form a primary hydraulic cylinder, the second pin mechanism 8 is sheared under the action of the hydraulic pressure as the pressure of the high-pressure fluid is increased, the force application member 6 moves downward in the axial direction under the action of the high-pressure fluid, and the slips 11 extend outward in the radial direction under the action of the force application member 6.

After the pressing operation is completed, the locking half ring 7 and the force application member 6 are engaged with the locking teeth 73 through the one-way thread teeth 71, and the movable gap 72 between the outer cylinder 4 and the locking half ring 7 is sufficient for the outer cylinder 4 to be capable of clamping the locking half ring 7. Therefore, the possibility of unsealing the slips 11 during pressure relief is effectively prevented, and effective suspension of the tool to the liner is ensured. When releasing the clamping, the body 2 is lifted upwards, the first pin mechanism 3 is cut off, the boss 23 of the body 2 carries the mandrel 5, the outer cylinder 4 in threaded connection with the mandrel 5 and the force application piece 6 abutted to the stopping part 10 to move upwards, the slip 11 rebounds to release the clamping, the clamping jaw 52 of the mandrel 5 stretches inwards to separate the first clamping part 121 from the second clamping part 521, releasing is completed, the taper sleeve 12 moves downwards and falls on the lower ferrule 13.

The liner hanger has the advantages of simple structure, safety, reliability, convenience in field operation and the like, the liner hanger can realize reliable suspension of the underground liner through ground pressing, the releasing and recovery of the underground liner can be realized through lifting the body, and effective implementation of well completion operation is guaranteed.

The above embodiments are merely illustrative of the technical concepts and features of the present disclosure, and are intended to enable those skilled in the art to understand the contents of the present disclosure and implement the present disclosure, and not to limit the scope of the present disclosure. All equivalent changes or modifications made according to the spirit of the present specification should be covered within the protection scope of the present specification.

Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified. All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes.

Claims

1. A liner hanger, comprising:

a longitudinally extended groove is arranged between the first end and the second end of the body, and a liquid inlet hole is formed in the groove of the body, so that the liquid inlet hole is connected with the hollow cavity of the body to form the liquid inlet flow channel;

a plurality of slips disposed outside the body, the plurality of slips being movable along the force applying member in a radial direction of the body; when the seat is sealed, the force application piece moves towards the second end under the pushing of liquid until the force application piece is abutted to the stopping part; when the slip is unsealed, the body is lifted, the boss and the limiting part are matched to drive the mandrel and the force application piece to move upwards, and the slip returns.

2. The liner hanger of claim 1, further comprising: the outer barrel is sleeved on the outer side of the mandrel and fixedly connected with the mandrel, the outer barrel is connected with the body through a first pin mechanism, a cavity for containing the force application part is formed between the outer barrel and the mandrel, the force application part is provided with a locking mechanism for limiting the direction of the force application part towards the movement of the first end, and the locking mechanism is arranged between the outer barrel and the force application part.

3. The liner hanger of claim 2, further comprising: the taper sleeve is sleeved at the second end of the body and matched with the slips, a first clamping part is arranged on the taper sleeve, the mandrel is connected with a clamping jaw capable of contracting inwards, a second clamping part is arranged on the clamping jaw, and the boss can apply expansion force to the clamping jaw to clamp the first clamping part and the second clamping part;

4. The liner hanger of claim 2, wherein the locking mechanism comprises: a plurality of locking teeth disposed on the force applying member; the locking half ring is connected between the outer barrel and the force application part and provided with a first side close to the force application part and a second side close to the outer barrel, one-way thread teeth clamped with the plurality of locking teeth are arranged on the first side, and a movable gap is formed between the second side and the outer barrel.

5. The liner hanger of claim 3, further comprising: the slip sleeve is arranged outside the body in a sleeved mode, square holes for the slips to stretch out are formed in the slip sleeve, the slip sleeve is connected with the force application piece through a second pin mechanism, and the shearing strength of the second pin mechanism is smaller than that of the first pin mechanism.

6. The liner hanger of claim 5, wherein the force applying member has an inverted conical surface, the slip has a first inclined surface that mates with the inverted conical surface, the cone sleeve has an outer conical surface, and the slip has a second inclined surface that mates with the outer conical surface.

7. The liner hanger of claim 5, wherein the plurality of slips are spaced apart circumferentially of the body, the slips comprising: the slip comprises an upper slip and a lower slip which are connected, wherein the upper slip is provided with a plurality of upper slip teeth, the lower slip is provided with a plurality of lower slip teeth, and the orientation of the upper slip teeth is opposite to that of the lower slip teeth.

8. The liner hanger of claim 6, wherein the force applying member comprises: the slip segment with the inverted cone-shaped surface and the connecting segment connected with the slip sleeve are arranged, a first annular cavity is formed between the slip segment and the mandrel, the stopping portion is fixed in the first annular cavity, and a limiting step is formed at the transition position of the slip segment and the connecting segment.

9. The liner hanger according to claim 3, wherein a second annular chamber for the boss to move is formed between the jaw and the body, the position where the mandrel and the jaw transition forms the limiting portion, and the boss and the limiting portion are arranged at a distance.

10. The liner hanger according to claim 2, wherein sealing rings are provided between the body and the mandrel, between the mandrel and the outer barrel, between the force applying member and the mandrel, and between the force applying member and the outer barrel.