CN214384140U

CN214384140U - Hydraulic cement retainer

Info

Publication number: CN214384140U
Application number: CN202022453532.4U
Authority: CN
Inventors: 张正德; 张彬彬; 顾红霞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-10-12
Anticipated expiration: 2030-10-29

Abstract

The utility model discloses a hydraulic cement retainer, which comprises an upper joint; a piston sleeve; a cannula within the piston sleeve; the packing assembly is connected with the insertion pipe through a releasing shear pin; the pushing assembly is arranged in the piston cavity and is in sliding fit with the piston cavity, and the pushing assembly is connected with the upper joint through a locking structure; the pressure relief shear pin is fixed on a ball seat in the insertion tube, a pressure relief cavity is arranged below the ball seat, and the inner cavity of the insertion tube is communicated with the ground layer through a space between the outer wall of the ball seat and the pressure relief cavity; and the one-way valve is arranged below the pressure relief cavity and is fixedly connected with the packing component. The utility model provides a hydraulic pressure cement holds and stays ware, a trip can accomplish the setting and crowded cement work, prevents that cement from holding and stays the inside jam of ware, convenient operation, and is efficient, and with low costs, and can prevent formation liquid reflux.

Description

Hydraulic cement retainer

Technical Field

The utility model relates to an operation instrument field in the pit especially relates to hydraulic pressure cement holds and stays ware.

Background

The cement retainer is mainly used for temporarily and permanently plugging or secondarily cementing an underground oil layer, a gas layer and a water layer, cement slurry is squeezed into a well section to be plugged in an annular space or into cracks and pores of a stratum through the cement retainer so as to achieve the purposes of plugging and leakage repairing, and the conventional cement retainer mainly comprises a mechanical type and a hydraulic type.

The existing mechanical cement retainer can finish setting and cement squeezing work of the cement retainer by lifting, placing and rotating an oil pipe or a drill rod once. However, in a highly deviated well or a horizontal well, because the frictional resistance between the pipe column and the inner wall of the casing pipe is large, the torque on the ground cannot be effectively transmitted to the underground mechanical cement retainer, and the underground mechanical cement retainer cannot be operated underground; secondly, the mechanical cement retaining device can complete setting only by lifting a large tonnage, the self weight of the pipe column of the deep well is large, and in addition, the lifting and setting force required during setting has high requirements on ground lifting equipment and tensile strength of the pipe column, and the equipment cost is high.

The existing hydraulic cement retainer is suitable for various wells such as a vertical well, an inclined well, a horizontal well and the like, but needs to go into the well twice to finish setting and cement squeezing respectively, wastes time, occupies working hours of a drilling machine, and has high cost; and often during the first time of tripping the setting pipe column for lowering the well and the second time of tripping the cement squeezing pipe column for lowering the well, because mud, settled sand or other falling objects in the well can settle and block the set cement retainer, the second time of lowering the well can not complete the cement squeezing work.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hydraulic pressure cement holds and stays ware, the work of setting and crowded cement can be accomplished to the well of once going into, prevents that cement from holding and stays the inside jam of ware, convenient operation, and is efficient, and is with low costs, and can prevent formation liquid reflux.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model discloses a hydraulic cement retainer, which comprises,

an upper joint;

the piston sleeve is connected with the upper connector;

a cannula connected to the top sub and within the piston sleeve, a piston cavity being provided between the piston sleeve and the cannula;

a packing assembly connected to the cannula through a releasing shear pin, the cannula being within the packing assembly, the packing assembly being below the piston sleeve;

the pushing assembly is arranged in the piston cavity and is in sliding fit with the piston cavity, the pushing assembly is connected with the upper joint through a locking structure, a pressurizing channel communicated with the inner cavity of the upper joint is formed in the piston cavity above the pushing assembly, the lower end of the pushing assembly penetrates out of the piston cavity, the locking structure releases the connection between the pushing assembly and the upper joint after hydraulic pressure flowing in the pressurizing channel reaches a preset value, and the pushing assembly slides downwards to push the packing assembly to seal the packing assembly;

the pressure relief shear pin is fixed on a ball seat in the insertion pipe, a pressure relief cavity is arranged below the ball seat, the inner diameter of the pressure relief cavity is larger than the outer diameter of the ball seat, the ball seat moves downwards into the pressure relief cavity under the hydraulic action above the pressure relief shear pin after the pressure relief shear pin is cut off, and the inner cavity of the insertion pipe is communicated with the ground layer through a space between the outer wall of the ball seat and the pressure relief cavity;

and the one-way valve is arranged below the pressure relief cavity and fixedly connected with the packing assembly, the pressure relief cavity is communicated with the stratum through the one-way valve, and the one-way valve is used for stopping the backflow of stratum liquid.

The utility model has the advantages that: through top connection oil pipe, with hydraulic pressure cement retainer below to the design position, throw the ball through the well head, pressurize, make the locking structure contact to bulldoze the locking of subassembly, bulldoze the subassembly and move down under hydraulic pressure's effect, promote to pack the subassembly and accomplish the setting, then continue to pressurize, the shear pin of giving up is cut off, the success of giving up, the part of accessible oil pipe lift up the articulate, pressure rises, after cutting off the pressure release shear pin, the ball seat falls to the pressure release chamber, intubate inner chamber and stratum are through the pressure release chamber intercommunication, can be at the well head through intubate squeeze cement, once go down the well and can accomplish setting and squeeze cement work, prevent the inside jam of cement retainer, high efficiency, low cost, set up the check valve below the pressure release chamber and communicate with the stratum through the check valve, can prevent stratum liquid from backflowing.

Furthermore, the intubate with top connection threaded connection, the intubate with the top connection junction has prevents changeing the pin, prevent changeing the both ends of pin and imbed respectively the intubate with in the top connection, prevent changeing the pin be used for the top connection with the back is connected to the intubate with the top connection relative rotation.

The beneficial effect of adopting the further scheme is that: the intubation tube and the upper joint are connected through threads, connection is convenient, the anti-rotation pin is arranged, connection can be prevented from being relieved when the intubation tube and the upper joint rotate relatively, and completion of underground work is guaranteed.

Further, the packing assembly includes,

the central tube is connected with the inserting tube through the releasing shear pin, the inserting tube is arranged in the central tube, and the inner cavity at the lower part of the central tube is the pressure relief cavity;

the lower joint is fixedly connected with the lower end of the central pipe, and the one-way valve is fixedly arranged in the lower joint;

the slip is established in proper order from top to bottom outside the central tube and the last slips, last cone, packing element, cone and the slips down of mutual butt, go up the slips through packing shear pin with the central tube is connected, the lower extreme of slips down with the upper end butt of lower clutch, it is used for promoting to bulldoze the subassembly and be used for promoting go up the slips along go up cone surface removal and promotion go up the cone is cut packing shear pin makes go up the cone and move down the extrusion packing element down the cone with slip down so that go up the slips down with packing element and sleeve setting.

The beneficial effect of adopting the further scheme is that: the upper slip and the lower slip are fixed with the inner wall of the casing in a clamping mode, sealing with the casing is achieved through the extrusion of the rubber cylinder, fixing is stable, sealing effect is good, and operation is convenient.

Further, the lower slips pass through the connecting key with the center tube sliding connection, the connecting key is used for preventing the lower slips with the center tube relative rotation.

The beneficial effect of adopting the further scheme is that: after the work is accomplished, finally seal the subassembly and stay in the pit, set up the key and avoid relative rotation between center tube and the slips down, the mode of being convenient for the later stage through boring to destroy is cleared up remaining seal subassembly in the pit.

Furthermore, the middle part of packing element inner wall has annular V type groove, it leaves the ring rather than the bearing that matches to have in the V type groove, it passes through the sealing washer with the sealed cooperation of center tube to hold the ring.

The beneficial effect of adopting the further scheme is that: the rubber cylinder is extruded to deform along the surface of the retaining ring, so that the deformation of the rubber cylinder can be controlled, and the sealing effect is ensured.

Furthermore, the lower end of the pressure relief cavity is provided with an intercepting basket, and the intercepting basket is used for intercepting the ball seat in the pressure relief cavity after the pressure relief shear pin is cut off.

The beneficial effect of adopting the further scheme is that: after the pressure relief shear pin is sheared off, the parts such as the one-way valve and the like under the impact of the ball seat are prevented from being damaged.

Furthermore, the intubation tube is in sealing fit with the packing assembly through an annular sealing groove with a T-shaped section and a matched T-shaped sealing ring embedded in the annular sealing groove.

The beneficial effect of adopting the further scheme is that: compared with a sealing ring with a circular cross section, the sealing ring has better sealing performance in a hydraulic environment, and avoids sealing failure caused by pressure rush.

Further, the pushing assembly includes a pushing member,

the first piston is sleeved outside the cannula;

the lower end of the push cylinder penetrates out of the piston cavity;

the locking structure comprises a locking structure which comprises a locking pin,

the second piston is sleeved outside the first piston and is connected with the first piston through a starting shear pin, and the second piston is arranged between the first piston and the piston sleeve;

a locking hole penetrating through the side wall of the first piston, wherein an opening on the outer side of the locking hole is covered by the second piston, a moving space for the second piston to move is arranged below the second piston, and the length of the moving space is greater than or equal to the distance from the upper end of the second piston to the lower edge of the locking hole;

the locking groove is arranged on the outer wall of the upper joint and corresponds to the locking hole, and the inner wall of the lower side of the locking groove is an inclined plane which inclines forwards from inside to outside;

the two ends of the locking piece are respectively embedded into the locking groove and the locking hole, the length of the locking piece is larger than the depth of the locking hole, and the first piston is connected with the upper joint through the locking piece;

the pressurization passage communicates with the piston cavity above the first piston and the second piston.

The beneficial effect of adopting the further scheme is that: the setting work is started after the hydraulic pressure reaches a preset value and the shear pin is sheared and started, so that the control is convenient, and the advance setting in the process of descending the well is avoided.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

in the figure: 1. an upper joint; 11. a pressurizing channel; 12. a clamp spring; 13. anti-rotation pins; 2. a piston sleeve; 21. a piston cavity; 3. inserting a tube; 31. an upper cannula; 32. a middle cannula; 321. a T-shaped sealing ring; 33. a lower cannula; 34. releasing the shear pin; 41. a central tube; 42. the slips are put on; 43. An upper cone; 431. packing the shear pins; 432. a locking ring; 433. an upper spacer ring; 434. an upper outer back ring; 435. an upper inner back ring; 44. a rubber cylinder; 441. a retaining ring; 45. a lower cone; 451. a connecting bond; 452. a lower spacer ring; 453. a lower outer back ring; 454. a lower inner back ring; 46. a slip is put down; 47. a lower joint; 5. a ball seat; 51. pressure relief shear pins; 52. a pressure relief cavity; 53. an intercepting basket; 6. a one-way valve; 71. a first piston; 72. a second piston; 73. a push cylinder; 74. starting the shear pin; 75. a locking block; 76. a movement space; 8. a seal ring;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the present invention discloses an embodiment of a hydraulic cement retainer, comprising,

the oil pipe joint comprises an upper joint 1, wherein the upper joint 1 is used for being connected with an oil pipe, and the upper end of the upper joint 1 is provided with internal threads;

the piston sleeve 2 is connected with the upper connector 1, the piston sleeve 2 is connected with the upper connector 1 through a clamp spring 12, and a sealing ring 8 is arranged between the inner wall of the piston sleeve 2 and the outer wall of the upper connector 1 to enable the connection part to be in sealing fit;

a cannula 3 connected with the upper connector 1 and arranged in the piston sleeve 2, and a piston cavity 21 is arranged between the piston sleeve 2 and the cannula 3;

the intubation tube 3 is arranged in the packing assembly through the packing assembly connected with the intubation tube 3 through the releasing shear pin 34, the packing assembly is arranged below the piston sleeve 2, and the packing assembly is in sealing fit with the outer wall of the intubation tube 3;

the pushing and pressing assembly is arranged in the piston cavity 21 and is in sliding fit with the piston cavity 21, the pushing and pressing assembly is connected with the upper connector 1 through a locking structure, a pressurizing channel 11 communicated with the inner cavity of the upper connector 1 is formed in the piston cavity 21 above the pushing and pressing assembly, the lower end of the pushing and pressing assembly penetrates out of the piston cavity 21, the locking structure releases the connection between the pushing and pressing assembly and the upper connector 1 after hydraulic pressure flowing in the pressurizing channel 11 reaches a preset value, and the pushing and pressing assembly slides downwards to push the packing assembly to seat the packing assembly;

the ball seat 5 is fixed in the insertion pipe 3 through a pressure relief shear pin 51, a pressure relief cavity 52 is arranged below the ball seat 5, the inner diameter of the pressure relief cavity 52 is larger than the outer diameter of the ball seat 5, after the pressure relief shear pin 51 is sheared, the ball seat 5 moves downwards into the pressure relief cavity 52 under the action of hydraulic pressure above the ball seat 5, and the inner cavity of the insertion pipe 3 is communicated with the ground through the space between the outer wall of the ball seat 5 and the pressure relief cavity 52;

and the check valve 6 is arranged below the pressure relief cavity 52 and fixedly connected with the packing assembly, the pressure relief cavity 52 is communicated with the stratum through the check valve 6, and the check valve 6 is used for stopping the backflow of stratum liquid.

The insertion tube 3 comprises an upper insertion tube 313, an intermediate insertion tube 323 and a lower insertion tube 333, wherein the upper end and the lower end of the intermediate insertion tube 323 are respectively in threaded connection with the lower end of the upper insertion tube 313 and the upper end of the lower insertion tube 333, and the connection part of the intermediate insertion tube 323 with the upper insertion tube 313 and the lower insertion tube 333 is sealed through a sealing ring 8.

As a further scheme of the embodiment, the insertion tube 3 is in threaded connection with the upper joint 1, the joint of the insertion tube 3 and the upper joint 1 is provided with an anti-rotation pin 13, the anti-rotation pin 13 penetrates through the side wall of the upper joint 1 from the outer wall of the upper joint 1 and penetrates into the insertion tube 3, two ends of the anti-rotation pin 13 are respectively embedded into the insertion tube 3 and the upper joint 1, and the anti-rotation pin 13 is used for preventing the insertion tube 3 and the upper joint 1 from rotating relatively after the upper joint 1 and the insertion tube 3 are connected.

Specifically, the packing assembly comprises a packing body,

a central tube 41 connected with the cannula 3 through the releasing shear pin 34, the cannula 3 is arranged in the central tube 41, and the inner cavity at the lower part of the central tube 41 is a pressure relief cavity 52;

the lower joint 47 is fixedly connected with the lower end of the central tube 41, the lower joint 47 can be in threaded connection with the central tube 41, the inner cavity of the central tube 41 is communicated with the inner cavity of the lower joint 47, and the one-way valve 6 is fixedly arranged in the lower joint 47;

the upper slip 42, the upper cone 43, the rubber cylinder 44, the lower cone 45 and the lower slip 46 are sequentially sleeved outside the central tube 41 from top to bottom and are mutually abutted, the upper slip 42 is connected with the central tube 41 through a packing shear pin 431, the lower end of the lower slip 46 is abutted with the upper end of the lower joint 47, and the pushing and pressing assembly is used for pushing the upper slip 42 to move along the surface of the upper cone 43 and pushing the upper cone 43 to shear the packing shear pin 431 so that the upper cone 43 moves downwards to press the rubber cylinder 44, the lower cone 45 and the lower slip 46 to enable the upper slip 42, the lower slip 46 and the rubber cylinder 44 to be seated with the casing.

As a further alternative to the above embodiment, the lower slips 46 are slidably connected to the base pipe 41 by a connecting key 451, the connecting key 451 being used to prevent the lower slips 46 from rotating relative to the base pipe 41.

An upper spacer ring 433, an upper outer back ring 434 and an upper inner back ring 435 are arranged between the rubber cylinder 44 and the upper cone 43, a lower spacer ring 452, a lower outer back ring 453 and a lower inner back ring 454 are arranged between the rubber cylinder 44 and the lower cone 45, and the upper cone 43 is connected with the central tube 41 in a sliding mode through a locking ring 432.

As a further scheme of the above embodiment, the middle part of the inner wall of the rubber cylinder 44 is provided with an annular V-shaped groove, a retaining ring 441 matched with the V-shaped groove is arranged in the V-shaped groove, and the retaining ring 441 is in sealing fit with the central pipe 41 through the sealing ring 8.

Other existing bridge plug structures can also be used for the packing assembly.

As a further scheme of the above embodiment, the lower end of the pressure relief cavity 52 is provided with a catching basket 53, the catching basket 53 is used for catching the ball seat 5 in the pressure relief cavity 52 after the pressure relief shear pin 51 is sheared, the catching basket 53 is arranged at the lower end of the central tube 41, the lower end of the central tube 41 is in threaded connection with the upper end of the lower connecting tube, and the connection position is sealed by the sealing ring 8.

As a further scheme of the above embodiment, the insertion tube 3 is in sealing fit with the packing assembly through an annular sealing groove with a T-shaped section on the outer wall of the insertion tube 3 and an adaptive T-shaped sealing ring 321 embedded in the annular sealing groove, and the T-shaped sealing ring 321 is embedded in the annular sealing groove with a T-shaped section, and cannot rotate under the impact of hydraulic pressure, so that the sealing performance can be maintained.

In particular, the pushing assembly comprises a pushing component,

a first piston 71 sleeved outside the cannula 3;

the push cylinder 73 is connected with the lower end of the first piston 71 and can be connected through threads, the upper end of the push cylinder 73 is arranged in the piston cavity 21, and the lower end of the push cylinder 73 penetrates out of the piston cavity 21;

a second piston 72 sleeved outside the first piston 71 and connected with the first piston 71 through a starting shear pin 74, wherein the second piston 72 is arranged between the first piston 71 and the piston sleeve 2;

a locking hole penetrating through the side wall of the first piston 71, the opening outside the locking hole being covered by the second piston 72, a moving space 76 for the second piston 72 to move being provided below the second piston 72, the length of the moving space 76 being greater than or equal to the distance from the upper end of the second piston 72 to the lower edge of the locking hole;

the locking groove is arranged on the outer wall of the connecting section protruding from the middle part of the lower end of the upper joint 1 and corresponds to the locking hole, and the inner wall of the lower side of the locking groove is an inclined plane inclining forwards from inside to outside;

the two ends of the locking block 75 are respectively embedded into the locking groove and the locking hole, the length of the locking block 75 is larger than the depth of the locking hole, so that the two ends of the locking block 75 can be respectively contacted with the groove bottom of the locking groove and the inner wall of the second piston 72, and the first piston 71 is connected with the upper connector 1 through the locking block 75;

the pressurizing passage 11 communicates the piston chamber 21 above the first piston 71 and the second piston 72.

After the hydraulic pressure flowing in through the pressurizing channel 11 shears the starting shear pin 74, the second piston 72 moves downwards to expose the opening outside the locking hole, the locking block 75 is disengaged from the locking groove to release the connection between the first piston 71 and the upper joint 1, the first piston 71 can slide along the outer wall of the insertion tube 3 in the piston cavity 21, and the first piston 71 moves downwards to drive the pushing cylinder 73 to push the packing assembly to seal the packing assembly.

The shearing pressure of the starting shear pin 74 is 8-10MPa, the shearing pressure of the releasing shear pin 34 is 20-22MPa, and the shearing pressure of the pressure relief shear pin 51 is 28-30 MPa. The shear pressure of activating shear pin 74 is less than the shear pressure of packing shear pin 431 is less than the shear pressure of releasing shear pin 34 is less than the shear pressure of pressure releasing shear pin 51.

Through the upper joint 1, when the pressurization reaches 8-10MPa, the shear pin 74 is started to shear, the second piston 72 and the first piston 71 sequentially push the push cylinder 73 to extrude the upper slip 42, the upper cone 43, the rubber cylinder 44, the lower cone 45 and the lower slip 46, the lower end of the lower slip 46 is abutted against the lower joint 47, the packing shear pin 431 in the upper cone 43 is sheared, and after the cone pushes the slip to be clamped and fixed with the casing, the rubber cylinder 44 is continuously compressed to form sealing. When the pressure reaches 20-22MPa, the releasing shear pin 34 is cut off, the central pipe 41 is separated from the insertion pipe 3, the insertion pipe 3 can be lifted up through the upper connector 1, the pressure is continuously increased to 28-30MPa after releasing the pressure successfully, the pressure releasing shear pin 51 is cut off, the ball seat 5 is lost and falls into the intercepting basket 53, the oil pipe is decompressed, the inner cavity of the insertion pipe 3 is communicated with the stratum, at the moment, cement is squeezed by applying pressure of 80-100KN at the wellhead, the cement squeezing operation can be carried out on the stratum, and the lower one-way valve 6 can prevent the liquid in the stratum from being reversely discharged.

When in use, a 118mm drift size drift is firstly used to ensure the inner wall of the casing to be smooth;

then connecting the upper joint 1 with 27/8UP TBG thickened oil pipe, lowering to the designed position at a limited speed, and positively washing the well by 1.5-2 times of the oil pipe volume water without throwing balls;

after well flushing, the ball is thrown to be matched with the ball seat 5 to block the inner cavity of the insertion tube 3; then pressurizing to 6-8-10-12-16-18-24MPa, stabilizing the pressure for 3min, continuing to boost the pressure until the pressure drops suddenly, releasing the hand successfully, if 25MPa is not released, lifting the oil pipe 40-50KN under pressure, then pressing down 100KN, striking the ball seat 5 until the pressure drops suddenly, and communicating the inner cavity of the insertion pipe 3 with the stratum;

then the pipe column is pressed down by 80-100KN load, the sealing is tested by positive extrusion, the pressure is 10MPa, or the discharge capacity is 500L/min, and the extrusion and injection operation is carried out.

In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are used broadly and encompass, for example, a fixed connection, a removable connection, or an integral connection, either directly or indirectly through intervening media. The specific meaning of the above terms in the utility model can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or unit referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a hydraulic pressure cement holds and stays ware which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

an upper joint (1);

a piston sleeve (2) connected with the upper joint (1);

a cannula (3) connected to the upper connector (1) and inside the piston sleeve (2), a piston chamber (21) being provided between the piston sleeve (2) and the cannula (3);

a packing assembly connected to the cannula (3) by a releasing shear pin (34), the cannula (3) being within the packing assembly, the packing assembly being below the piston sleeve (2);

the pushing assembly is arranged in the piston cavity (21) and is in sliding fit with the piston cavity (21), the pushing assembly is connected with the upper connector (1) through a locking structure, a pressurizing channel (11) communicated with the inner cavity of the upper connector (1) is formed in the piston cavity (21) above the pushing assembly, the lower end of the pushing assembly penetrates out of the piston cavity (21), after the hydraulic pressure flowing into the pressurizing channel (11) reaches a preset value, the locking structure releases the connection between the pushing assembly and the upper connector (1), and the pushing assembly slides downwards to push the packing assembly to seat the packing assembly;

the pressure relief shear pin is characterized by comprising a ball seat (5) fixed in the insertion pipe (3) through a pressure relief shear pin (51), a pressure relief cavity (52) is formed below the ball seat (5), the inner diameter of the pressure relief cavity (52) is larger than the outer diameter of the ball seat (5), after the pressure relief shear pin (51) is sheared, the ball seat (5) moves downwards into the pressure relief cavity (52) under the action of hydraulic pressure above the pressure relief cavity, and the inner cavity of the insertion pipe (3) is communicated with the ground layer through a space between the outer wall of the ball seat (5) and the pressure relief cavity (52);

and the check valve (6) is arranged below the pressure relief cavity (52) and is fixedly connected with the packing assembly, the pressure relief cavity (52) is communicated with the stratum through the check valve (6), and the check valve (6) is used for stopping the backflow of stratum liquid.

2. A hydraulic cement receptacle according to claim 1, characterized in that: intubate (3) with top connection (1) threaded connection, intubate (3) with top connection (1) junction has prevents changeing pin (13), prevent changeing the both ends of pin (13) and imbed respectively intubate (3) with in top connection (1), prevent changeing pin (13) and be used for top connection (1) with prevent after intubate (3) is connected intubate (3) with top connection (1) relative rotation.

3. A hydraulic cement receptacle according to claim 1, characterized in that: the packing assembly includes a packing assembly having a packing head,

a central tube (41) connected with the insertion tube (3) through the releasing shear pin (34), wherein the insertion tube (3) is arranged in the central tube (41), and the inner cavity at the lower part of the central tube (41) is the pressure relief cavity (52);

the lower joint (47) is fixedly connected with the lower end of the central pipe (41), and the one-way valve (6) is fixedly arranged in the lower joint (47);

the upper slip (42), the upper cone (43), the rubber cylinder (44), the lower cone (45) and the lower slip (46) are sequentially sleeved outside the central tube (41) from top to bottom and are mutually abutted, the upper slip (42) is connected with the central tube (41) through a packing shear pin (431), the lower end of the lower slip (46) is abutted to the upper end of the lower joint (47), and the pushing and pressing assembly is used for pushing the upper slip (42) to move along the surface of the upper cone (43) and pushing the upper cone (43) to shear the packing shear pin (431), so that the upper cone (43) moves downwards to extrude the rubber cylinder (44), the lower cone (45) and the lower slip (46) to enable the upper slip (42), the lower slip (46) and the rubber cylinder (44) to be seated with the sleeve.

4. A hydraulic cement receptacle according to claim 3, characterized in that: the lower slip (46) is connected with the central pipe (41) in a sliding mode through a connecting key (451), and the connecting key (451) is used for preventing the lower slip (46) and the central pipe (41) from rotating relatively.

5. A hydraulic cement receptacle according to claim 3, characterized in that: the middle part of the inner wall of the rubber cylinder (44) is provided with an annular V-shaped groove, a bearing ring (441) matched with the V-shaped groove is arranged in the V-shaped groove, and the bearing ring (441) is in sealing fit with the central pipe (41) through a sealing ring (8).

6. A hydraulic cement receptacle according to claim 1, characterized in that: the lower end of the pressure relief cavity (52) is provided with a blocking basket (53), and the blocking basket (53) is used for blocking the ball seat (5) in the pressure relief cavity (52) after the pressure relief shear pin (51) is cut off.

7. A hydraulic cement receptacle according to claim 1, characterized in that: the insertion pipe (3) is in sealing fit with the packing assembly through an annular sealing groove with a T-shaped section and a matched T-shaped sealing ring (321) embedded in the annular sealing groove.

8. A hydraulic cement receptacle according to claim 1, characterized in that: the pushing assembly comprises a pushing component and a pressing component,

a first piston (71) sleeved outside the cannula (3);

the lower end of the push cylinder (73) penetrates out of the piston cavity (21);

a second piston (72) sleeved outside the first piston (71) and connected with the first piston (71) through a starting shear pin (74), wherein the second piston (72) is arranged between the first piston (71) and the piston sleeve (2);

a locking hole penetrating through the side wall of the first piston (71), wherein an opening on the outer side of the locking hole is covered by the second piston (72), a moving space (76) for moving the second piston (72) is arranged below the second piston (72), and the length of the moving space (76) is larger than or equal to the distance from the upper end of the second piston (72) to the lower edge of the locking hole;

the locking groove is arranged on the outer wall of the upper joint (1) and corresponds to the locking hole, and the inner wall of the lower side of the locking groove is an inclined plane which inclines forwards from inside to outside;

the two ends of the locking piece (75) are respectively embedded into the locking groove and the locking hole, the length of the locking piece (75) is larger than the depth of the locking hole, and the first piston (71) is connected with the upper joint (1) through the locking piece (75);

the pressurizing passage (11) communicates the piston chamber (21) above the first piston (71) and the second piston (72).