CN114320181A

CN114320181A - Underground stretching rotary joint and using method thereof

Info

Publication number: CN114320181A
Application number: CN202011075061.6A
Authority: CN
Inventors: 柴龙顺; 张亮; 朱培; 李汉兴; 左凯; 李跃谦; 陈璐思; 李振坤; 魏来; 陈琳
Original assignee: China National Offshore Oil Corp CNOOC; CNOOC Energy Technology and Services Ltd
Current assignee: China National Offshore Oil Corp CNOOC; CNOOC Energy Technology and Services Ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2022-04-12

Abstract

The invention provides an underground stretching rotary joint and a using method thereof, wherein the inner wall of the head end of a central cylinder is connected with the outer wall of the tail end of a coupling through threads, the inner wall of the head end of a lower joint is connected with the inner wall of the tail end of the central cylinder through threads, the outer wall of the middle part of the central cylinder is provided with clamping steps, the tail end of a rotating sleeve is provided with clamping teeth which are in one-to-one correspondence with the clamping steps, the clamping teeth are meshed with the clamping steps, the outer wall of the central cylinder above the clamping steps is provided with threads, the head end of the rotating sleeve is in threaded connection with the outer wall of the middle part of the central cylinder, and a fixing pin penetrates through the side wall of the head end of the lower joint to connect the head end of the lower joint with the rotating sleeve. The rotary joint has the advantages of simple structure, convenience in installation and operation, safety and reliability, and can realize the function conversion of relative rotation or relative locking rotation for unlimited times.

Description

Underground stretching rotary joint and using method thereof

Technical Field

The invention relates to the technical field of oilfield well completion, in particular to a downhole tensile rotary joint and a using method thereof.

Background

Along with the development of the drilling and completion technology to the directions of deep wells, extended reach wells, branch wells and the like, the well completion technology is continuously self-renovated, and simultaneously, higher requirements are put forward on the functionality of various well completion tools; the rotary joint tool is a necessary service tool for realizing different operations of an outer-layer tubular column tool in well completion operation, and can solve the problem that the field operation risk is greatly increased due to overlong well completion tubular column and overlarge rotary friction resistance.

Disclosure of Invention

The invention overcomes the defects in the prior art, the field operation risk is easily greatly increased due to overlong well completion pipe column and overlarge rotation friction resistance, and the rotary joint for underground stretching and the use method thereof are provided.

The purpose of the invention is realized by the following technical scheme.

The utility model provides a tensile rotary joint in pit, includes coupling, a center section of thick bamboo, commentaries on classics cover and lower clutch, the head end inner wall of a center section of thick bamboo pass through the screw thread with the tail end outer wall of coupling links to each other, the head end inner wall of lower clutch pass through the screw thread with the tail end inner wall of a center section of thick bamboo links to each other the joint step has been seted up on the middle part outer wall of a center section of thick bamboo, the tail end of changeing the cover be provided with the joint tooth of joint step one-to-one, the joint tooth with the meshing of joint step the joint step top set up screw thread on the outer wall of a center section of thick bamboo, the head end of changeing the cover with the middle part outer wall threaded connection of a center section of thick bamboo, the fixing pin runs through the head end lateral wall of lower clutch will the head end with it links to change the cover.

Be provided with lower clutch female thread on the head end inner wall of lower clutch offer the dowel hole that is used for the fixing pin to pass on the head end lateral wall of lower clutch, sealed step has been seted up on the head end inner wall of lower clutch the top of sealed step with be provided with the friction pad who is used for accepting the dead effort of lock when rotatory between the bottom of joint step, be provided with the public screw thread of lower clutch on the tail end outer wall of lower clutch.

The friction gasket is made of tungsten carbide hard alloy materials.

The inner wall of the sealing step is uniformly provided with a sealing groove, and the sealing ring is arranged in the sealing groove.

The fillet rectangle structure is along changeing the vertical unsmooth crisscross formation of cover the joint tooth, the joint step with the meshing of joint tooth, a central section of thick bamboo relies on separation, the meshing of joint tooth and joint step with the lower clutch to realize that a central section of thick bamboo dies with the relative rotation or relative lock of lower clutch two.

The outer diameter of the head end of the rotating sleeve is larger than that of the tail end of the rotating sleeve.

The inner wall of the head end of the coupling and the inner wall of the tail end of the coupling are both provided with coupling female threads.

The underground stretching rotary joint adopts a through hole structure.

A method for using an underground stretching rotary joint comprises the steps that the underground stretching rotary joint is lowered to an underground designated position, a coupling is driven to press down through a top, the coupling presses down a center barrel, the center barrel presses down a joint to enable a clamping step on the center barrel to be separated from clamping teeth on a rotating sleeve, the center barrel and the lower joint can rotate, and then an upper well completion string connected with the coupling of the rotary joint and a lower well completion string connected with the lower joint of the rotary joint can rotate;

the coupling is lifted upwards, the coupling pulls the central barrel upwards, the central barrel pulls the lower joint upwards to realize that the clamping step is meshed with the clamping teeth on the rotating sleeve, the central barrel and the lower joint are locked, and then the upper well completion string connected with the coupling of the rotary joint and the lower well completion string connected with the lower joint of the rotary joint are connected into a whole, so that torque can be transmitted.

The invention has the beneficial effects that: the upper and lower pipe column strings of the rotary joint tool can realize infinite rotation and locking function conversion, and can transmit torque downwards in a locking state; the rotary joint has the advantages of simple structure, convenience in installation and operation, safety, reliability, high stability, convenience in operation and low manufacturing cost.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the construction of the center barrel of the present invention;

FIG. 3 is a schematic view of the structure of the swivel sleeve of the present invention;

in the figure: 1 is a coupling; 2 is a central cylinder; 3, rotating sleeve; 4 is a lower joint; 5 is a friction pad; 6 is a fixed pin; 7 is a sealing ring; 8 is a clamping step; and 9 is a clamping tooth.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

The technical solution of the present invention is further illustrated by the following specific examples.

Example one

The utility model provides a tensile rotary joint in pit, including coupling 1, a center section of thick bamboo 2, change cover 3 and lower clutch 4, the head end inner wall of a center section of thick bamboo 2 passes through the screw thread and links to each other with coupling 1's tail end outer wall, the head end inner wall of lower clutch 4 passes through the screw thread and links to each other with center section of thick bamboo 2's tail end inner wall, joint step 8 has been seted up on center section of thick bamboo 2's middle part outer wall, the tail end of changeing cover 3 is provided with the joint tooth 9 with joint step 8 one-to-one, joint tooth 9 and the meshing of joint step 8, set up screw thread on the outer wall of a center section of thick bamboo 2 above joint step 8, the head end of changeing cover 3 and the middle part outer wall threaded connection of a center section of thick bamboo 2, fixing pin 6 links to each other head end and the cover 3 of lower clutch 4 through the head end lateral wall of lower clutch.

Example two

On the basis of embodiment one, be provided with lower clutch box thread on the head end inner wall of lower clutch 4, offer the cotter hole that is used for fixing pin 6 to pass on the head end lateral wall of lower clutch 4, offer sealed step on the head end inner wall of lower clutch 4, be provided with the friction gasket 5 that is used for accepting the dead effort of lock when rotatory between the top of sealed step and the bottom of joint step 8, be provided with the public screw thread of lower clutch on the tail end outer wall of lower clutch 4.

The friction pad 5 is made of tungsten carbide hard alloy material.

The inner wall of the sealing step is uniformly provided with a sealing groove, and the sealing ring 7 is arranged in the sealing groove.

EXAMPLE III

On the basis of the second embodiment, the fillet rectangular structure forms the clamping teeth 9 along the longitudinal concave-convex staggering of the rotating sleeve, the clamping steps 8 are meshed with the clamping teeth 9, and the central cylinder 2 and the lower joint 4 are separated and meshed by the clamping teeth 9 and the clamping steps 8 so as to realize the relative rotation or relative locking of the central cylinder 2 and the lower joint 4.

The outer diameter of the head end of the rotating sleeve 3 is larger than that of the tail end of the rotating sleeve 3.

The inner wall of the head end of the coupling 1 and the inner wall of the tail end of the coupling 1 are both provided with coupling female threads.

The underground stretching rotary joint adopts a through hole structure.

Example four

A method for using a downhole tensile rotary joint comprises the steps that the downhole tensile rotary joint is lowered to a specified position in a well, a coupling is driven by a top to press down a central barrel, the coupling presses down a central barrel, the central barrel presses down the joint, a fixing pin between the lower joint and a rotating sleeve is disconnected under the action of shearing force, so that a clamping step on the central barrel is separated from a clamping tooth on the rotating sleeve, the central barrel and the lower joint can rotate, and an upper well completion string connected with the coupling of the rotary joint and a lower well completion string connected with the lower joint of the rotary joint can rotate;

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and is not to be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. A tensile rotary joint in pit which characterized in that: including coupling, a center section of thick bamboo, commentaries on classics cover and lower clutch, the head end inner wall of a center section of thick bamboo pass through the screw thread with the tail end outer wall of coupling links to each other, the head end inner wall of lower clutch pass through the screw thread with the tail end inner wall of a center section of thick bamboo links to each other set up the joint step on the middle part outer wall of a center section of thick bamboo, the tail end of changeing the cover be provided with the joint tooth of joint step one-to-one, the joint tooth with the joint step meshing set up screw thread on the outer wall of a center section of thick bamboo joint step top, the head end of changeing the cover with the middle part outer wall threaded connection of a center section of thick bamboo, the fixing pin runs through the head end lateral wall of lower clutch will the head end of lower clutch with it links to each other to change the cover.

2. A downhole tension swivel according to claim 1, wherein: be provided with lower clutch female thread on the head end inner wall of lower clutch offer the dowel hole that is used for the fixing pin to pass on the head end lateral wall of lower clutch, sealed step has been seted up on the head end inner wall of lower clutch the top of sealed step with be provided with the friction pad who is used for accepting the dead effort of lock when rotatory between the bottom of joint step, be provided with the public screw thread of lower clutch on the tail end outer wall of lower clutch.

3. A downhole tension swivel according to claim 2, wherein: the friction gasket is made of tungsten carbide hard alloy materials.

4. A downhole tension swivel according to claim 3, wherein: the inner wall of the sealing step is uniformly provided with a sealing groove, and the sealing ring is arranged in the sealing groove.

5. A downhole tension swivel according to claim 1, wherein: the fillet rectangle structure is along changeing the vertical unsmooth crisscross formation of cover the joint tooth, the joint step with the meshing of joint tooth, a central section of thick bamboo relies on separation, the meshing of joint tooth and joint step with the lower clutch to realize that a central section of thick bamboo dies with the relative rotation or relative lock of lower clutch two.

6. A downhole tension swivel according to claim 1, wherein: the outer diameter of the head end of the rotating sleeve is larger than that of the tail end of the rotating sleeve.

7. A downhole tension swivel according to claim 1, wherein: the inner wall of the head end of the coupling and the inner wall of the tail end of the coupling are both provided with coupling female threads.

8. A downhole tension swivel according to claim 1, wherein: the underground stretching rotary joint adopts a through hole structure.

9. A method of using a downhole tension swivel according to claims 1-8, wherein: the method comprises the following steps that a downhole tensile rotary joint is lowered to a downhole designated position, a coupling is driven to press down a coupling, the coupling presses down a central cylinder, the central cylinder presses down the coupling, a fixing pin between the lower coupling and a rotating sleeve is disconnected under the action of shearing force, so that a clamping step on the central cylinder is separated from a clamping tooth on the rotating sleeve, the central cylinder and the lower coupling can rotate, and an upper well completion string connected with the coupling of the rotary joint and a lower well completion string connected with the lower coupling of the rotary joint can rotate;