CN217813402U

CN217813402U - Drilling-free cement bearing device

Info

Publication number: CN217813402U
Application number: CN202221800863.3U
Authority: CN
Inventors: 韩召宝; 王学
Original assignee: Liaoning Kuncheng Industrial Co ltd
Current assignee: Liaoning Kuncheng Industrial Co ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2022-11-15
Anticipated expiration: 2032-07-13

Abstract

The utility model relates to an oil field workover technical field, in particular to exempt from to bore cement and hold commentaries on classics ware. The device includes safety joint, anchoring device, backwash valve and sealed packing element mechanism, safety joint includes top connection I, well core rod I and lower clutch I, I inner wall connection well core rod I of top connection, the design has the conical surface on the I outer wall of well core rod, the cover is equipped with the slips on well core rod I, the inboard calorie of slips and I outer wall conical surface phase-match of well core rod can lock, be equipped with on I inner wall of top connection to the spacing step I of slips up end, it has assorted connecting thread to design respectively on the slips outside conical surface and the I inboard conical surface of lower clutch. The utility model discloses a reliability is high, and the fault rate is low and exempt from to bore cement and hold commentaries on classics ware.

Description

Drilling-free cement bearing device

The technical field is as follows:

the utility model relates to an oil field workover technical field, in particular to exempt from to bore cement and hold ware that changes.

Background art:

the conventional cement extruding method includes a horizontal pushing method, a low-injection high-extrusion method and a smooth oil pipe positive and negative jacking method, and the unconventional extruding method includes a packer extruding method and a cement retainer extruding method. The flat push method has the advantages of no drilling blocking risk, and can be used for waiting and setting under pressure, and has the disadvantages that the cement quantity can not be accurately quantified, the quantity of cement is less, the formation is unsaturated, the cement squeezing fails, the quantity of cement is more, the risk of not-in-place jacking is caused, and the drilling and plugging process is increased. The low-injection high-extrusion method has the advantages of small drilling sticking risk, accurate displacement, capability of pressing and weather setting and less cement paste amount. The extrusion of the smooth oil pipe has the advantages of adjustable and controllable cement paste amount, capability of weather setting under pressure, and the defects of high drilling risk, high ash extrusion pressure and easiness in crushing the casing pipe. The packer has the defects of low cement extrusion pressure, high risk of drilling sticking and the like, and is basically not adopted. The cement mortar extrusion of the cement retention device adopts the most mortar extrusion mode at present, and has the advantages that: the ash amount is controllable, the ash squeezing pressure is high, the upper sleeve is protected, the setting can be performed under pressure, the risk of drill sticking is avoided, and the like. The disadvantages are: the retainer has high requirements on the sleeve, the retainer has a complex structure, high failure rate, more operation requirements for pulling off, short sealing distance, easy sealing, difficult drilling and grinding and poor overall adaptability.

The utility model has the following contents:

the to-be-solved technical problem of the utility model is to provide an exempt from to bore cement and hold commentaries on classics ware, the device have realized that the reliability is high, and the fault rate is low and exempt from to bore cement and hold commentaries on classics ware. The defects that the existing cement retaining device has high requirement on a sleeve, a complex structure, high failure rate, more operation requirements for pulling down, short sealing distance, easy sealing, difficult drilling and grinding and poor overall adaptability are overcome.

The utility model adopts the technical proposal that: a drilling-free cement rotation bearing device comprises a safety joint, an anchoring device, a backwashing valve and a sealing rubber cylinder mechanism, wherein the safety joint comprises an upper joint I, a central rod I and a lower joint I, the inner wall of the upper joint I is connected with the central rod I, the outer wall of the central rod I is provided with a conical surface, a slip is sleeved on the central rod I, a clamping tooth inside the slip is matched with and can be locked with the conical surface of the outer wall of the central rod I, the inner wall of the upper joint I is provided with a limiting step I for limiting the upper end surface of the slip, the conical surface outside the slip and the conical surface inside the lower joint I are respectively provided with matched connecting threads, and the central rod I and the lower joint I are sealed through a sealing mechanism;

the anchoring device comprises an upper joint II, a central pipe II and a lower joint II, the lower end of the upper joint II is connected with the central pipe II, a cone is sleeved outside the central pipe II, a slip seat is fixed on the outer wall of the lower end of the central pipe II through a shearing pin, an anchoring slip is mounted on the slip seat, and the lower end of the slip seat is connected with the lower joint II;

the sealing rubber cylinder mechanism comprises a central tube III, a one-way valve is arranged in the central tube III, a sealing rubber cylinder and a self-sealing rubber cylinder are sequentially sleeved on the outer side of the central tube III from top to bottom, the self-sealing rubber cylinder is arranged in a release cylinder in a compression mode, and the release cylinder seals a channel at the lower end of the central tube III;

the lower connector I of the safety connector is connected with the upper connector II of the anchoring device, the lower connector II of the anchoring device is connected with the upper connector of the backwashing valve, and the lower connector of the backwashing valve is connected with the central pipe III of the sealing rubber cylinder mechanism.

Furthermore, the outer wall of the upper end of the slip is provided with a limiting step II for limiting the upper end face of the lower connector I.

Furthermore, the outer conical surface of the slip is provided with left-handed threads matched with the inner conical surface of the lower connector I.

Furthermore, the sealing mechanism comprises a connecting ring, a sealing ring is mounted on the connecting ring, and the connecting ring is sleeved on the outer wall of the lower end of the central rod I.

The beneficial effects of the utility model are that: the utility model discloses a reliability is high, and the fault rate is low and exempt from to bore cement and hold commentaries on classics ware.

Description of the drawings:

the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the safety joint.

Fig. 3 is a schematic view of the structure of the anchoring device.

The specific implementation mode is as follows:

as shown in figures 1, 2 and 3, the drilling-free cement rotation bearing device comprises a safety joint 1, an anchoring device 2, a backwashing valve 3 and a sealing rubber cylinder mechanism 4, wherein the safety joint 1 comprises an upper joint I1-1, a central rod I1-2 and a lower joint I1-4, the inner wall of the upper joint I1-1 is connected with the central rod I1-2, the outer wall of the central rod I1-2 is designed with a conical surface, the central rod I1-2 is sleeved with slips 1-3, inner-side clamping teeth of the slips 1-3 are matched with the conical surface of the outer wall of the central rod I1-2 and can be locked, the inner wall of the upper joint I1-1 is provided with a limiting step I for limiting the upper end surface of the slips 1-3, the outer wall of the upper end of the slips 1-3 is provided with a limiting step II for limiting the upper end surface of the lower joint I1-4, the outer side of the slips 1-3 is provided with left-handed threads matched with the inner side of the lower joint I1-4, the central rod I1-2 and the lower joint I1-4 are sealed through the sealing mechanism 1-5, the connecting ring is arranged on the conical surface of the connecting ring, and the upper connecting ring I1-5.

Slips 1-3 and lower joints I1-4 of the safety joint 1 are connected through left-handed threads, if the safety joint needs to be disconnected, the pipe column is rotated rightwards to drive the upper joints I1-1 and the slips 1-3 to rotate, and the connection part is the left-handed threads, so that the safety joint is disconnected in a proper condition. If the pipe string needs to be connected again, only the pipe string needs to be lowered, the slips 1-3 slip teeth shrink, the left-handed threads on the outer wall of the slips 1-3 are meshed with the left-handed threads on the inner side conical surface of the lower connector I1-4, the center rod I1-2 is lifted, and the outer wall conical surface of the center rod I1-2 is locked with the inner side clamping teeth of the slips 1-3. In the process of lifting and lowering, the sealing mechanism 1-5 ensures the sliding sealing effect between the central rod I1-2 and the lower joint I1-4.

The anchoring device 2 comprises an upper joint II 2-1, a central tube II 2-2 and a lower joint II 2-6, the lower end of the upper joint II 2-1 is connected with the central tube II 2-2, a cone 2-3 is sleeved on the outer side of the central tube II 2-2, a slip seat 2-5 is fixed on the outer wall of the lower end of the central tube II 2-2 through a shearing dowel, an anchoring slip 2-4 is mounted on the slip seat 2-5, and the lower end of the slip seat 2-5 is connected with the lower joint II 2-6.

The sealing rubber cylinder mechanism 4 comprises a central tube III 4-1, a one-way valve 4-2 is arranged in the central tube III 4-1, a sealing rubber cylinder 4-3 and a self-sealing rubber cylinder 4-4 are sequentially sleeved on the outer side of the central tube III 4-1 from top to bottom, a release cylinder 4-5 is sleeved on the outer side of the self-sealing rubber cylinder 4-4, and the release cylinder 4-5 seals a lower end channel of the central tube III 4-1. The self-sealing rubber cylinder 4-4 is a low-pressure self-sealing rubber cylinder, the sealing rubber cylinder 4-3 is a high-pressure rubber cylinder, the bearing pressure difference is 35MPa, the self-sealing rubber cylinder 4-4 is compressed and installed in the release cylinder 4-5 in advance, the downward movement of the self-sealing rubber cylinder in a well is not influenced, the self-sealing rubber cylinder 4-4 is pressed when reaching a preset position, the release cylinder 4-5 is pushed away, and the self-sealing rubber cylinder 4-4 is released and sealed in the well.

The lower joint I1-4 of the safety joint 1 is connected with the upper joint II 2-1 of the anchoring device 2, the lower joint II 2-6 of the anchoring device 2 is connected with the upper joint of the backwashing valve 3, and the lower joint of the backwashing valve 3 is connected with the central pipe III 4-1 of the sealing rubber cylinder mechanism 4.

The utility model discloses the construction step does after the work of going into the well: the self-sealing rubber cylinder 4-4 is arranged in the release cylinder 4-5 in advance, the release cylinder 4-5 is pushed off by pressing through an oil pipe, the self-sealing rubber cylinder 4-4 is released, the self-sealing rubber cylinder 4-4 is expanded and sealed to play a role in sealing an annular space between the central pipe III 4-1 and a shaft, an upward force acting on the sealing rubber cylinder 4-3 is exerted along with the rise of pressure, the upward thrust is neutralized by the self weight of the pipe column, when the upward thrust is larger than 60KN, a shearing pin of the slip seat 2-5 is sheared, the slip seat 2-5 and the anchoring slip 2-4 simultaneously move upwards, the anchoring slip 2-4 contacts the cone 2-3 and then expands outwards to be anchored on the casing pipe, and self-locking force is generated to prevent the integral pipe column from moving upwards. At the moment, the cement squeezing construction can be normally carried out, including squeezing of the pad fluid, the cement slurry and the displacement fluid, when the displacement fluid is finished, the pressure in the oil pipe is released, and at the moment, the one-way valve 4-2 starts to work, so that the reverse spitting of the stratum cement slurry is prevented. In order to prevent cement slurry from remaining in the pipe or running into the pipe, the well can be washed back, and tools above 4-4 of the self-sealing rubber cylinder are thoroughly cleaned to prevent the accident of pipe column clamping. After waiting for the coagulation bundle, the pipe column is lifted up, and the anchoring slips 2-4 are contracted, the tool body can be lifted out.

When the tool is used, cement squeezing construction is carried out, cement paste can be squeezed directly if stratum absorption pressure is low, the safety connector can be separated by rotating forward if stratum absorption pressure is high, the cement paste is conveyed to a proper position in a well, then the inserting pipe is inserted, and the cement paste is squeezed into the stratum. And (3) replacing clear water after ash squeezing is finished, directly performing pressurized gel waiting if the clear water can be normally replaced in place, reversely washing the well if the clear water cannot be replaced in place, washing out redundant cement paste, performing pressurized gel waiting, and lifting the tubular column to lift the cement converter out of the gel waiting bundle without drilling and grinding.

It should be understood that the above detailed description of the present invention is only used for illustrating the present invention and not limited to the technical solutions described in the embodiments of the present invention, and it should be understood by those skilled in the art that the present invention can be modified or replaced with equivalent ones to achieve the same technical effects; as long as the use requirement is satisfied, the utility model is within the protection scope.

Claims

1. The utility model provides a exempt from to bore cement and hold commentaries on classics ware which characterized in that: the safety joint comprises a safety joint (1), an anchoring device (2), a backwashing valve (3) and a sealing rubber cylinder mechanism (4), wherein the safety joint (1) comprises an upper joint I (1-1), a central rod I (1-2) and a lower joint I (1-4), the inner wall of the upper joint I (1-1) is connected with the central rod I (1-2), the outer wall of the central rod I (1-2) is designed with a conical surface, a slip (1-3) is sleeved on the central rod I (1-2), an inner side slip tooth of the slip (1-3) is matched with the conical surface of the outer wall of the central rod I (1-2) and can be locked, a limiting step I for limiting the upper end face of the slip (1-3) is arranged on the inner wall of the upper joint I (1-1), matched connecting threads are respectively arranged on the outer conical surface of the slip (1-3) and the inner conical surface of the lower joint I (1-4), and the central rod I (1-2) and the lower joint I (1-4) are sealed through a sealing mechanism (1-5);

the anchoring device (2) comprises an upper joint II (2-1), a central tube II (2-2) and a lower joint II (2-6), the lower end of the upper joint II (2-1) is connected with the central tube II (2-2), a cone (2-3) is sleeved on the outer side of the central tube II (2-2), a slip seat (2-5) is fixed on the outer wall of the lower end of the central tube II (2-2) through a shearing dowel, an anchoring slip (2-4) is installed on the slip seat (2-5), and the lower end of the slip seat (2-5) is connected with the lower joint II (2-6);

the sealing rubber cylinder mechanism (4) comprises a central tube III (4-1), a one-way valve (4-2) is arranged in the central tube III (4-1), a sealing rubber cylinder (4-3) and a self-sealing rubber cylinder (4-4) are sequentially sleeved on the outer side of the central tube III (4-1) from top to bottom, the self-sealing rubber cylinder (4-4) is installed in a release cylinder (4-5) in a compression mode, and the release cylinder (4-5) seals a lower end channel of the central tube III (4-1);

the lower connector I (1-4) of the safety connector (1) is connected with the upper connector II (2-1) of the anchoring device (2), the lower connector II (2-6) of the anchoring device (2) is connected with the upper connector of the backwashing valve (3), and the lower connector of the backwashing valve (3) is connected with the central pipe III (4-1) of the sealing rubber cylinder mechanism (4).

2. The drill-free cement rotor as defined in claim 1, wherein: and the outer wall of the upper end of the slip (1-3) is provided with a limiting step II for limiting the upper end face of the lower joint I (1-4).

3. The drill-free cement running gear according to claim 1, wherein: and the outer conical surface of the slip (1-3) is provided with left-handed threads matched with the inner conical surface of the lower joint I (1-4).

4. The drill-free cement rotor as defined in claim 1, wherein: the sealing mechanism (1-5) comprises a connecting ring, a sealing ring is arranged on the connecting ring, and the connecting ring is sleeved on the outer wall of the lower end of the central rod I (1-2).