CN209892156U

CN209892156U - Plugging bypass for leakage well

Info

Publication number: CN209892156U
Application number: CN201920195796.9U
Authority: CN
Inventors: 刘练; 张平; 邹伟; 翟科军; 谢进; 杨坤; 李娟�; 李洪文; 邓克; 柳小伟; 路程遥
Original assignee: China Petrochemical Corp; Sinopec Northwest Oil Field Co
Current assignee: China Petroleum and Chemical Corp; China Petrochemical Corp; Sinopec Northwest Oil Field Co
Priority date: 2019-02-13
Filing date: 2019-02-13
Publication date: 2020-01-03
Anticipated expiration: 2029-02-13

Abstract

The utility model provides a shutoff bypass for leaking well, include: the device comprises a body which is constructed into a hollow cylinder, wherein the side wall of the body is provided with a plurality of bypass circulation holes; the connecting short section is fixedly connected with one end of the body; the first joint is used for being connected with a pressurized pipe column, is inserted in the connecting short section and is fixedly connected with the connecting short section through a first shearing pin; the second joint is fixedly connected with the other end of the body and is used for connecting the packer; the closing sleeve is arranged in the body and is cylindrical, and the closing sleeve is fixedly connected with the body through a first positioning pin so as to enable the bypass circulation hole to be in an initial opening state; wherein the first sub is configured to shear the first shear pin and the first locating pin under the pressurization force of the pressurized string and to push the closure sleeve down the body to close the bypass circulation hole.

Description

Plugging bypass for leakage well

Technical Field

The utility model relates to an operation instrument technical field in the pit specifically relates to a shutoff bypass for leaking well.

Background

In the well completion construction process, before the temporary plugging string is lowered, because the well is not opened or the casing is not scraped, crystallization or attached impurities exist on the inner wall of the casing, and the inner diameter of the casing is reduced. When the inner diameter of the casing pipe is reduced to be smaller than the outer diameter of the packer, a certain seal is formed between the packer and the casing pipe, the packer is continuously lowered, piston force can be generated on the lower portion of the packer, and therefore the hydraulic anchor fluke is expanded to cause the lifting of the pipe column to be blocked. In addition, if the water hole is blocked during the running process of the packer, the fluid can only flow through a narrow gap between the packer and the casing, and the running of the packer in high-viscosity mud is difficult. These all seriously affect the progress of well completion construction, and reduce the construction efficiency and the construction effect thereof.

SUMMERY OF THE UTILITY MODEL

To the technical problem as described above, the present invention aims to provide a plugging bypass for a lost circulation well. The plugging bypass is used for being mounted on the upper portion of a packer, can increase a flow channel of fluid up and down of the packer, facilitates quick running of a pipe column, can avoid the problem that the pipe column is blocked due to piston action, and can effectively reduce the damage of slurry to a rubber sleeve. Meanwhile, after the packer is set, the bypass circulation hole of the blocking bypass can be reliably closed, and the sealing performance of the blocking bypass can be effectively guaranteed.

Therefore, according to the utility model discloses, a shutoff bypass for leaking well is provided, include: the device comprises a body which is constructed into a hollow cylinder, wherein the side wall of the body is provided with a plurality of bypass circulation holes; the connecting short section is fixedly connected with one end of the body; the first joint is used for being connected with a pressurized pipe column, is inserted in the connecting short section and is fixedly connected with the connecting short section through a first shearing pin; the second joint is fixedly connected with the other end of the body and is used for connecting the packer; the closing sleeve is arranged in the body and is cylindrical, and the closing sleeve is fixedly connected with the body through a first positioning pin so as to enable the bypass circulation hole to be in an initial opening state; wherein the first joint is configured to shear the first shear pin and the first locating pin under the pressurization force of the pressurization string and push the closing sleeve downward to close the bypass circulation hole.

In a preferred embodiment, an axially outwardly extending cylinder is provided on the lower end face of the first adapter, the end face of the cylinder is in contact with the end face of the closure sleeve, and the outer diameter of the cylinder is set smaller than the inner diameter of the body and larger than the inner diameter of the closure sleeve.

In a preferred embodiment, two axially extending keyways are symmetrically provided on the outer wall of the first joint, in which keyways a key capable of transmitting torque is mounted, the length of the key being smaller than the length of the keyways.

In a preferred embodiment, the outer wall of the lower end of the first joint is provided with a radially outward annular protrusion, and a first sealing element is arranged between the annular protrusion and the connecting short joint.

In a preferred embodiment, one end of the connecting short section is fixedly connected with a pressing cap, and the first joint and the connecting short section are in positioning installation through the pressing cap.

In a preferred embodiment, a second joint for connecting a packer is fixedly connected to the other end of the body.

In a preferred embodiment, both ends of the body are respectively provided with a positive connecting part and a negative connecting part configured in a step shape, and the positive connecting part and the negative connecting part are respectively used for being connected with the connecting short joint and the second joint.

In a preferred embodiment, a positioning sleeve is fixedly installed inside the second joint through a second positioning pin.

In a preferred embodiment, a protective sleeve is mounted between the second connector and the locating sleeve by a second shear pin, the protective sleeve being configured to shear the second shear pin under the downward force of the closure sleeve and to descend with the closure sleeve.

In a preferred embodiment, second sealing elements are arranged between the body and the closing sleeve and between the first joint and the protective sleeve, and the second sealing elements are used for sealing the closed bypass circulation hole.

Drawings

The present invention will be described with reference to the accompanying drawings.

Figure 1 shows a structure of a plugging bypass for a thief well according to the present invention.

In the present application, all the figures are schematic and are only intended to illustrate the principles of the present invention and are not drawn to scale.

Detailed Description

In this application, it should be noted that, when the plugging bypass according to the present invention is put into the wellbore, the end close to the wellhead is defined as "upper end" or the like, and the end away from the wellhead is defined as "lower end" or the like.

Fig. 1 shows the structure of a plugging bypass 100 for a lost circulation well according to the present invention. As shown in fig. 1, the block bypass 100 includes a body 110, the body 110 being configured as a hollow cylinder. One end of the body 110 is provided with a stepped positive connection part 111 and the other end is provided with a stepped negative connection part 112. An external thread is provided on the positive connection 111 and an internal thread is provided on the negative connection 112. The body 110 is connected to other components by a positive connection part 111 and a negative connection part 112, and forms a fixed connection by a screw connection. The connection structure of the body 110 is simple, the installation is convenient, and the stability of the connection between the body 110 and other components can be effectively ensured.

In the present embodiment, a plurality of bypass circulation holes 113 are formed in the sidewall of the body 110. The plurality of bypass circulation holes 113 are disposed at the same axial position of the body 110 and are uniformly spaced apart in the circumferential direction. In one embodiment, four bypass circulation holes 113 are provided on the sidewall of the body 110. In the setting process of the packer, the flow channel of the upper fluid and the lower fluid of the packer can be enlarged through the bypass circulation hole 113, so that the quick running of the pipe column is facilitated.

According to the utility model discloses, connect nipple joint 120 at the upper end fixedly connected with of body 110. As shown in fig. 1, the coupling nipple 120 is configured to be substantially cylindrical, and the outer diameter of the coupling nipple 120 is set to be equal to the outer diameter of the body 110. The inner part of the lower end of the connecting short section 120 is provided with an internal thread, and the lower end of the connecting short section 120 is fixedly connected with the positive connecting part 111 at the upper end of the body 110 through a threaded connection. The upper end face of the coupling nipple 120 is provided with a connecting portion extending axially outward and configured in a cylindrical shape, and the connecting portion is used for connecting with other components. An annular bulge facing radially inwards is arranged on the inner wall of the upper part of the connecting short joint 120. The inner wall area of the connection short section 120, which is provided with the annular protrusions, is provided with a plurality of threaded holes 121, and the threaded holes 121 are arranged at the same axial position of the connection short section 120 and are distributed at equal intervals in the circumferential direction. A first shear pin 131 is mounted in the threaded bore 121, the function of the first shear pin 131 being described below.

In addition, in order to ensure the sealing performance between the body 110 and the coupling sub 120, a sealing member is provided between the positive connection portion 111 of the body 110 and the coupling sub 120.

As shown in fig. 1, a first coupling 140 is inserted into the nipple 120, the first coupling 140 being used to connect the block bypass 100 to a pressurized string for pressurization. The first joint 140 is configured as a hollow cylinder. A cylinder 141 extending axially outward is provided on a lower end surface of the first joint 140, and an outer diameter of the cylinder 141 is set smaller than an inner diameter of the body 110. In addition, an annular protrusion 142 extending radially outward is provided on the outer wall of the lower end of the first joint 140, the outer diameter of the annular protrusion 142 is equal to the inner diameter of the coupling sub 120, and when the coupling sub is installed, the end of the annular protrusion 142 contacts the end of the annular protrusion in the coupling sub 120. A seal 148 is provided between the annular projection 142 and the coupling sub 120. In the embodiment shown in fig. 1, the sealing element 148 is an O-ring, and two O-rings are disposed between the annular protrusion 142 and the coupling nipple 120. The seal 148 effectively improves the sealing and reliability of the connection between the coupling sub 120 and the first joint 140.

In the present embodiment, the connection portion 121 of the coupling sub 120 is mounted with a pressing cap 150, and the first joint 140 and the coupling sub 120 are positioned by the pressing cap 150. A positioning groove corresponding to the threaded hole 123 on the connection nipple 120 is formed on the outer side of the side wall of the first joint 140, and the first shear pin 131 extends to the bottom of the positioning groove, so that the first joint 140 is further positioned through the first shear pin 131. The first sub 140 is capable of shearing the first shear pin 131 and descending the body 110 under the pressurization of the pressurized string.

According to the present invention, two key grooves 143 extending in the axial direction are symmetrically provided on the outer wall of the first joint 140, and a key 144 is installed in the key groove 143. The key 144 is capable of transmitting torque when the mechanical packer is set or other abnormal conditions. In this embodiment, the length of the key 144 is less than the length of the key slot 143 so that the key 144 can move within the key slot 143 to secure the first connector 140 down after the first connector 140 shears the first shear pin 131.

According to the present invention, a closure sleeve 160 is provided in the body 110. As shown in fig. 1, the closure sleeve 160 is configured in a cylindrical shape, and the outer diameter of the closure sleeve 160 is set to be equal to the inner diameter of the body 110 and the inner diameter is set to be equal to the inner diameter of the cylinder 141 of the first connector 140. The closing sleeve 160 is fixedly connected to the body 110 by the first positioning pin 132, and an upper end surface of the closing sleeve 160 contacts an end surface of the cylinder 141 of the first connector 140. The closing sleeve 160 is initially positioned at an upper portion of the bypass circulation hole 113, thereby opening the bypass circulation hole 113. The first locating pin 132 locates and prevents the closure sleeve 160 from rattling down the wellbore inadvertently closing the bypass circulation hole 113 with a shear force value that is small relative to the shear force value of the first shear pin 131. The first shear pin 131 is sheared and the first positioning pin 132 is sheared, so that the first joint 140 descends until the lower end surface of the first joint 140 comes into contact with the upper end surface of the body 110. Thereby, the closing sleeve 160 is moved downward by the first connector 140 until the bypass circulation hole 113 is closed. In this embodiment, a seal 114 is provided between the closure sleeve 160 and the body 110. In one embodiment, the seal 114 is an O-ring seal, and two O-rings are provided between the closure sleeve 160 and the body 110. The sealing element 114 is effective to ensure sealing performance for plugging the bypass 100.

According to the utility model discloses, at the lower extreme fixedly connected with second joint 170 of body 110, second joint 170 is used for being connected with the packer to be connected shutoff bypass 100 to packer upper portion. As shown in fig. 1, the second joint 170 has a joint portion 171 fitted to the negative connection portion 112 of the body 110 at one end and a positive taper coupling for coupling with a packer at the other end. The joint part 171 is provided with external threads so as to be engaged with the internal threads of the negative connection part 112 of the lower end of the body 110 to fixedly connect the second joint 170 with the body 110. In order to ensure the sealing property of the connection between the second joint 170 and the body 110, a sealing member is provided at the connection between the second joint 170 and the body 110.

In the present embodiment, a positioning sleeve 180 configured in a cylindrical shape is fixedly mounted inside the second joint 170. As shown in fig. 1, a shoulder is provided inside the second joint 170, and the lower end surface of the positioning sleeve 180 abuts on the shoulder. In one embodiment, a radially outward annular protrusion is provided on the outside of one end (lower end in fig. 1) of the positioning sleeve 180, and a positioning groove is provided on the annular protrusion. Meanwhile, a threaded hole is formed in the side wall of the second joint 170, and during installation, the threaded hole can correspond to the positioning groove, and the second positioning pin 133 is installed in the threaded hole and extends to the bottom of the positioning groove, so that the positioning sleeve 180 is fixedly installed. A protective sleeve 190 is fixedly connected to the outer side of the upper portion of the positioning sleeve 180 by the second shear pin 134, the protective sleeve 190 is configured in a cylindrical shape, one end of the protective sleeve 190 is flush with the end portion of the joint portion 171 of the second joint 170, and the other end of the protective sleeve 190 is fixedly connected to the positioning sleeve 180 by the second shear pin 134. The inner diameter of the protective sleeve 190 is set to be equal to the outer diameter of the positioning sleeve 180, and the outer diameter is set to be equal to the inner diameter of the joint portion 171 of the second joint 170. An annular space is left between the locating sleeve 180 and the nipple portion 171 of the second nipple 170, and the protective sleeve 190 can be lowered into the annular space after it has been acted upon by the descending closure sleeve 160 and sheared off the second shear pin 134.

According to the present invention, an annular seal groove is formed in the inner wall of the joint portion 171 of the second joint 170 near the upper end, and the seal member 114 is also installed in the seal groove. In one embodiment, two axially spaced seal grooves are provided on the inner wall of the joint portion 171. After the bypass circulation hole 113 is closed, the sealing element 114 arranged between the first joint 140 and the connecting short section 120 and arranged at the end part of the second joint 170 cooperate to ensure that the bypass circulation hole 113 is reliably closed, thereby ensuring the sealing performance of the blocking bypass 100. The protective sleeve 190 is used to protect the seal from being exposed to mud during the run-in process, so as to prevent the seal from being squeezed out when the closing sleeve 160 descends over the seal during closing, and effectively ensure the sealing performance of the blocking bypass 100.

According to the utility model discloses a shutoff bypass 100 for leakage well is used for installing the upper portion of packer, and it can increase the fluidic flow channel about the packer effectively to made things convenient for the tubular column to go into down fast, and can avoid meeting because of the tubular column that the piston action arouses and hinder the card problem, effectively reduced the damage of mud to the packing element, improved the efficiency of construction that the tubular column was transferred. Meanwhile, after the packer is set, the bypass circulation hole 113 of the blocking bypass 100 can be reliably closed through the closing sleeve 160, and the closing sleeve 160 can be positioned and locked, so that the sealing performance of the blocking bypass 100 is effectively ensured.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and should not be construed as limiting the present invention in any way. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plugged bypass for a lost circulation well, comprising:

the device comprises a body (110) which is constructed into a hollow cylinder, wherein the side wall of the body is provided with a plurality of bypass circulation holes (113);

the connecting short section (120) is fixedly connected with one end of the body;

the first joint (140) is used for being connected with a pressurized pipe string, is inserted in the connecting short section and is fixedly connected with the connecting short section through a first shearing pin (131); and

a closure sleeve (160) disposed within the body, the closure sleeve being fixedly connected to the body by a first locating pin (132);

wherein the closing sleeve is configured to initially place the bypass circulation hole in an open state, and the first joint is configured to shear the first shear pin and the first locating pin under the pressurization force of the pressurization string and push the closing sleeve downward to close the bypass circulation hole.

2. The block bypass according to claim 1, characterized in that an axially outwardly extending cylinder (141) is provided at a lower end face of the first connector, an end face of the cylinder being in contact with an end face of the closure sleeve, and an outer diameter of the cylinder being provided smaller than an inner diameter of the body and larger than an inner diameter of the closure sleeve.

3. The block bypass according to claim 2, characterized in that two axially extending keyways (143) are symmetrically provided on the outer wall of the first connector, in which keyways a torque-transmittable key (144) is mounted, the length of the key being smaller than the length of the keyways.

4. The block bypass according to claim 3, wherein the outer wall of the lower end of the first connector is provided with a radially outward annular projection (142), and a first sealing element (148) is arranged between the annular projection and the connection nipple.

5. The block bypass according to any one of claims 1 to 4, wherein a pressing cap (150) is fixedly connected to one end of the connection sub, and the first joint is fixedly installed with the connection sub through the pressing cap.

6. The block bypass according to claim 1, wherein a second joint (170) for connection of a packer is fixedly connected to the other end of the body.

7. The block bypass according to claim 6, characterized in that both ends of the body are provided with a positive connection portion (111) and a negative connection portion (112) configured step-like, respectively, for connection with the connection nipple and the second joint, respectively.

8. The block bypass according to claim 6 or 7, characterized in that a positioning sleeve (180) is fixedly mounted inside the second joint by means of a second positioning pin (133).

9. The block bypass according to claim 8, wherein a protective sleeve (190) is mounted between the second connector and the positioning sleeve by a second shear pin (134), the protective sleeve being configured to shear the second shear pin under a downward force of the closure sleeve and to descend with the closure sleeve.

10. The block bypass according to claim 9, wherein a second seal (114) is provided between the body and the closure sleeve, and between the first connector and the protective sleeve, for sealing the closed bypass circulation hole.