阅读说明：本技术 一种井下湿连接器 (Wet connector in pit ) 是由 李宝龙 齐海涛 左凯 王昆剑 赵仲浩 闫绅 张斌 王明杰 于 2021-05-26 设计创作，主要内容包括：本发明公开了一种井下湿连接器,包括外筒和插头,所述外筒包括锁定套、本体、隔离套、第一弹簧滑套和电缆插头；所述插头包括芯轴、上接头、锁定机构、触头座、第二弹簧滑套和挡环；本发明为上部管柱和下部管柱连接提供了一种电缆连通方式和液压通道连通方式,采用该发明的部分结构,可扩展为井下电缆连接器和井下液压连接器两种不同工具；该发明的有效实施,可以使起出上部管柱时,下部管柱不动,同时保证再次下入上部管柱时,上部管柱和下部管柱的有效连接,提高了作业效率,降低了作业成本。(The invention discloses an underground wet connector which comprises an outer barrel and a plug, wherein the outer barrel comprises a locking sleeve, a body, an isolating sleeve, a first spring sliding sleeve and a cable plug; the plug comprises a mandrel, an upper joint, a locking mechanism, a contact seat, a second spring sliding sleeve and a baffle ring; the invention provides a cable communication mode and a hydraulic channel communication mode for connecting the upper pipe column and the lower pipe column, and the invention can be expanded into two different tools of an underground cable connector and an underground hydraulic connector by adopting the partial structure of the invention; the effective implementation of the invention can lead the lower pipe column to be fixed when the upper pipe column is pulled out, and simultaneously ensure the effective connection of the upper pipe column and the lower pipe column when the upper pipe column is put in again, thus improving the operation efficiency and reducing the operation cost.)

1. A downhole wet connector, comprising: comprises an outer cylinder and a plug;

the outer barrel comprises a locking sleeve, a body, an isolation sleeve, a first spring sliding sleeve and a cable plug;

the upper end of the body is connected with the locking sleeve, the inner wall of the body is provided with the isolation sleeve fixedly connected with the body, the isolation sleeve is provided with a circular ring contact and a first cable joint which are in contact with each other, the circular ring contact is positioned on the inner side of the isolation sleeve, and the first cable joint is positioned in an annular space formed by the isolation sleeve and the inner wall of the body;

the inner side of the body is communicated with a large inner diameter pipeline positioned at the upper part and a small inner diameter pipeline positioned at the lower part to form a first step, and a first spring sliding sleeve is arranged in the large inner diameter pipeline; the first spring sliding sleeve comprises a first sealing sleeve, a first spring and a support ring, the lower end of the first sealing sleeve is connected with the first spring, the lower end of the first spring is connected with the support ring, and the support ring abuts against the first step;

a first through cable channel is formed in the body barrel along the axial direction, a cable is arranged in the first cable channel, the upper end of the cable is connected with the first cable connector, and the lower end of the cable is connected with a first cable plug; the cylinder wall of the body is provided with 2 one-way valve mechanisms.

The plug comprises a mandrel, an upper joint, a locking mechanism, a contact seat, a second spring sliding sleeve and a baffle ring; the upper end of the mandrel is connected with an upper joint, the lower end of the mandrel is connected with a baffle ring, and a locking mechanism is arranged on the wall of the upper joint;

the contact seat is arranged on the mandrel, a contact and a second cable joint are arranged on the contact seat, the contact is positioned outside the contact seat, and the second cable joint is positioned in a square groove formed on the surface of the mandrel barrel wall inside the contact seat;

a protruding part is formed in the middle of the mandrel, and a second step is formed between the protruding part and the mandrel barrel below the protruding part; the second spring sliding sleeve comprises a second spring and a second sealing sleeve, the upper end of the second spring abuts against the second step, and the lower end of the second spring is connected with the second sealing sleeve; the mandrel is characterized in that 1 second cable channel and 2 hydraulic channels are arranged in the mandrel, a cable connecting hole is formed in the upper end face of the protruding portion of the second cable channel, a pipeline connecting hole is formed in the upper end of the protruding portion of the hydraulic channel, the hydraulic channel is communicated with a bypass hole formed in the mandrel, and sealing modules and spacer bushes are installed on the lower portion of the mandrel at intervals.

2. A downhole wet connector according to claim 1, wherein: a window is formed in the position, located at the first cable joint, of the cylinder wall of the body, and a closed outer cover is installed outside the window.

3. A downhole wet connector according to claim 1, wherein: the body circumference is equipped with the balancing hole.

4. A downhole wet connector according to claim 1, wherein: the check valve mechanism comprises a ball sealing hole, a pipeline connecting channel, an oblique circular groove, a nut, a small spring and a sealing ball, wherein the ball sealing hole is arranged on the wall of the body cylinder in a penetrating mode, the oblique circular groove is arranged on the surface of the body cylinder, the pipeline connecting channel is used for communicating the ball sealing hole with the oblique circular groove, the sealing ball, the small spring and the nut are arranged in the ball sealing hole, one end of the small spring abuts against the surface of the sealing ball, and the other end of the small spring abuts against the nut.

5. A downhole wet connector according to claim 1, wherein: an axial square groove is formed on the surface of the wall of the body cylinder by taking the oblique circular groove as a starting point along the axial direction.

6. A downhole wet connector according to claim 1, wherein: and the inner edge of the upper end of the first isolation sleeve is provided with isolation sleeve rubber. The spacer bush is internally provided with a groove and is circumferentially provided with communicating holes.

7. A downhole wet connector according to claim 1, wherein: the locking mechanism comprises a limiting sleeve, a locking claw and a fixing sleeve, the limiting sleeve is arranged at the upper end of the locking claw, and the fixing sleeve is arranged at the lower end of the locking claw.

8. A downhole wet connector according to claim 1, wherein: the contact seat comprises contact seat metal and contact seat rubber, and the contact seat metal and the contact seat rubber are vulcanized into a whole.

9. A downhole wet connector according to claim 1, wherein: and the upper joint is provided with three axial grooves for passing through a cable and a hydraulic control pipeline.

10. A downhole wet connector according to claim 1, wherein: the bypass holes are spirally distributed on the circumference of the mandrel.

Technical Field

The invention belongs to the technical field of petroleum and natural gas well completion, and particularly relates to an underground wet connector.

Background

With the advancement of technology, intelligent well completion technology is more and more popular. Intelligent completion tools are typically controlled electronically, hydraulically, or a combination thereof, with a wireline and/or hydraulic control line connected to the tubing string from the downhole tool to the surface. To make the electrical and hydraulic connections, the completion string is typically integral, and when it is desired to pull the string out, the entire string is pulled out together. If a connecting mechanism is designed, the whole pipe column is separated from a certain node, when the pipe column needs to be lifted, only the upper pipe column of the connecting mechanism is lifted, and when the pipe column needs to be lowered, the connecting mechanism still enables a control system on the ground to be connected to the lower pipe column through a cable and/or a hydraulic control pipeline, so that the working efficiency is greatly improved, and the working cost is greatly reduced. Therefore, it is significant to design such a connection mechanism.

Disclosure of Invention

The present invention aims to overcome the disadvantages of the prior art and to provide a downhole wet connector.

The invention is realized by the following technical scheme:

a downhole wet connector comprising an outer barrel and a plug;

the outer barrel comprises a locking sleeve, a body, an isolation sleeve, a first spring sliding sleeve and a cable plug;

the upper end of the body is connected with the locking sleeve, the inner wall of the body is provided with the isolation sleeve fixedly connected with the body, the isolation sleeve is provided with a circular ring contact and a first cable joint which are in contact with each other, the circular ring contact is positioned on the inner side of the isolation sleeve, and the first cable joint is positioned in an annular space formed by the isolation sleeve and the inner wall of the body;

the inner side of the body is communicated with a large inner diameter pipeline positioned at the upper part and a small inner diameter pipeline positioned at the lower part to form a first step, and a first spring sliding sleeve is arranged in the large inner diameter pipeline; the first spring sliding sleeve comprises a first sealing sleeve, a first spring and a support ring, the lower end of the first sealing sleeve is connected with the first spring, the lower end of the first spring is connected with the support ring, and the support ring abuts against the first step;

a first through cable channel is formed in the body barrel along the axial direction, a cable is arranged in the first cable channel, the upper end of the cable is connected with the first cable connector, and the lower end of the cable is connected with a first cable plug; the cylinder wall of the body is provided with 2 one-way valve mechanisms.

The plug comprises a mandrel, an upper joint, a locking mechanism, a contact seat, a second spring sliding sleeve and a baffle ring; the upper end of the mandrel is connected with an upper joint, the lower end of the mandrel is connected with a baffle ring, and a locking mechanism is arranged on the wall of the upper joint;

the contact seat is arranged on the mandrel, a contact and a second cable joint are arranged on the contact seat, the contact is positioned outside the contact seat, and the second cable joint is positioned in a square groove formed on the surface of the mandrel barrel wall inside the contact seat;

a protruding part is formed in the middle of the mandrel, and a second step is formed between the protruding part and the mandrel barrel below the protruding part; the second spring sliding sleeve comprises a second spring and a second sealing sleeve, the upper end of the second spring abuts against the second step, and the lower end of the second spring is connected with the second sealing sleeve; the mandrel is characterized in that 1 second cable channel and 2 hydraulic channels are arranged in the mandrel, a cable connecting hole is formed in the upper end face of the protruding portion of the second cable channel, a pipeline connecting hole is formed in the upper end of the protruding portion of the hydraulic channel, the hydraulic channel is communicated with a bypass hole formed in the mandrel, and sealing modules and spacer bushes are installed on the lower portion of the mandrel at intervals.

In the technical scheme, a window is formed at the position, located at the first cable joint, of the cylinder wall of the body, and a closed outer cover is installed outside the window.

In the technical scheme, the body is circumferentially provided with the balance holes.

In the technical scheme, the circular ring contact protrudes towards the inner side of the isolation sleeve.

In the technical scheme, the check valve mechanism comprises a ball sealing hole, a pipeline connecting channel, an oblique circular groove, a nut, a small spring and a sealing ball, the ball sealing hole is arranged on the wall of the body cylinder in a penetrating mode, the oblique circular groove is arranged on the surface of the body cylinder, the pipeline connecting channel is used for communicating the ball sealing hole with the oblique circular groove, the sealing ball, the small spring and the nut are arranged in the ball sealing hole, one end of the small spring abuts against the surface of the sealing ball, and the other end of the small spring abuts against the nut.

In the above technical solution, an axial square groove is formed on the surface of the cylinder wall of the body along the axial direction starting from the oblique circular groove.

In the technical scheme, the inner edge of the upper end of the first isolation sleeve is provided with isolation sleeve rubber.

In the above technical scheme, the locking mechanism comprises a limiting sleeve, a locking claw and a fixing sleeve, the limiting sleeve is arranged at the upper end of the locking claw, and the fixing sleeve is arranged at the lower end of the locking claw.

In the above scheme, the contact block comprises a contact block metal and a contact block rubber, and the contact block metal and the contact block rubber are vulcanized into a whole.

In the scheme, the spacer sleeve is internally provided with a groove, and communication holes are circumferentially formed.

In the scheme, three axial grooves are formed in the upper connector and used for penetrating through the cable and the hydraulic control pipeline.

In the above scheme, the bypass holes are spirally distributed on the circumference of the mandrel.

The invention has the advantages and beneficial effects that:

1. the invention provides a cable communication mode and a hydraulic channel communication mode for connecting the upper pipe column and the lower pipe column, and the invention can be expanded into two different tools of a downhole cable connector and a downhole hydraulic connector by adopting the partial structure of the invention.

2. The effective implementation of the invention can lead the lower pipe column to be fixed when the upper pipe column is pulled out, and simultaneously ensure the effective connection of the upper pipe column and the lower pipe column when the upper pipe column is put in again, thus improving the operation efficiency and reducing the operation cost.

Drawings

Fig. 1 is a schematic plan view of the outer tub of the present invention.

Fig. 2 is a schematic perspective view of the outer tub of the present invention.

Fig. 3 is a schematic structural diagram (one) of the check valve mechanism in the invention.

Fig. 4 is a schematic structural view (two) of the check valve mechanism of the present invention.

FIG. 5 is a schematic view of the structure of the isolation sleeve of the present invention.

Fig. 6 is a schematic view of the structure of the plug of the present invention.

Fig. 7 is a schematic structural view (one) of the mandrel of the present invention.

Fig. 8 is a schematic structural view (ii) of the mandrel of the present invention.

Fig. 9 is a schematic structural view (iii) of the mandrel of the present invention.

Figure 10 is a schematic view of a contact block configuration of the present invention.

FIG. 11 is a schematic view of the spacer structure of the present invention.

FIG. 12 is a schematic view of a top connector structure according to the present invention.

FIG. 13 is a schematic view of the upper joint structure of the present invention (II).

Wherein: 1 is a locking sleeve, 2 is an outer cover, 3 is a fixed pin, 4 is a circular ring contact, 5 is a first cable joint, 5 'is a second cable joint, 6 is an isolation sleeve, 7 is a first sealing sleeve, 8 is a first spring, 9 is a support ring, 10 is a body, 11 is a first cable plug, 11' is a second cable plug, 12 is a nut, 13 is a small spring, 14 is a sealing ball, 15 is an upper joint, 16 is a limit sleeve, 17 is a locking claw, 18 is a fixed sleeve, 19 is a mandrel, 20 is a sealing pin, 21 is a second spring, 22 is a second sealing sleeve, 23 is a contact seat, 24 is a contact, 25 is a retainer ring, 26 is a first cable channel, 27 is a ball sealing hole, 28 is a thread, 29 is a sealing thread, 30 is a pipeline connecting channel, 31 is an oblique circular groove, 32 is an axial square groove, 33 is a cone, a sealing surface 34 is a balance hole, 35 is isolation sleeve metal, 36 is isolation sleeve rubber, 37 is a seal thread, 38 is a thread, 39 is a second cable channel, 40 is a seal thread, 41 is a hydraulic channel, 42 is a seal thread, 43 is a bypass hole, 44 is a square groove, 45 is a cable connecting hole, 46 is a pipeline connecting hole, 47 is a contact block metal, 48 is a contact block rubber, 49 is a groove, 50 is a communicating hole, 51 is a seal module, 52 is a spacer bush, and 53 is an axial groove.

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

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.

Examples

Referring to fig. 1 and 6, the downhole wet connector comprises two parts, namely an outer cylinder and a plug, wherein the plug is inserted into the outer cylinder to realize the liquid-electric connection, and the plug is pulled out of the outer cylinder to realize the disconnection of the liquid-electric connection;

referring to fig. 1, the outer cylinder comprises a body 10, the upper end of the body 10 is connected with a locking sleeve 1, an outer cover 2 is sleeved on the body 10, an isolation sleeve 6 is connected with the body 10 through a fixing pin 3, a ring contact 4 and a cable joint 5 are respectively installed inside and outside the isolation sleeve 6, a sealing ring 7 is installed inside the isolation sleeve 6, a spring 8 is installed on the lower portion of the sealing ring 7, the spring 8 abuts against the step of the body 10 through a support ring 9, and a cable plug 11 is connected in a cable hole of the body 10. Referring to fig. 3 and 4, the body 10 is provided with a check valve mechanism in a radial direction, and the check valve mechanism is composed of a nut 12, a small spring 13 and a sealing ball 14.

Referring to fig. 6, the plug includes a core shaft 19, the upper end of the core shaft 19 is connected to the upper joint 15, the lower end is connected to the retainer ring 25, and the upper joint 15 is provided with a position-limiting sleeve 16, a locking claw 17 and a fixing sleeve 18. The contact seat 23 is installed on the mandrel 19 through threads, the cable connector 5 and the contact 24 are installed inside and outside the contact seat 23 respectively, the sealing sleeve 22 is arranged outside the contact seat 23, and the spring 21 is installed between the contact seat 23 and the step of the mandrel 19. A sealing module 51 and a spacer 52 are arranged at the lower end of the mandrel 19 at intervals, and a sealing pin 20 is arranged at one end of the cable channel 39 and the hydraulic hole 41 of the mandrel 19.

Referring to fig. 1, 2, 3 and 4, a cable hole 26 is formed in the body 10, and one end of the cable hole 26 is provided with a sealing thread 28 for installing the cable plug 11, and the lower end thereof is provided with a sealing thread 29 for installing and sealing a cable. The body 10 is circumferentially provided with balance holes. The radial direction of the body 10 is provided with a ball sealing hole 27, the inner side of the ball sealing hole 27 is provided with a conical sealing surface 33, and a seal is formed between the conical sealing surface 33 and the sealing ball 14. The side of the ball sealing hole 27 is provided with a pipeline connecting channel 30 for connecting a hydraulic control pipeline. The pipeline connecting passage 30 is provided with an oblique circular groove 31 and an axial square groove 32. The ball sealing hole 27, the pipeline connecting passage 30, the oblique circular groove 31 and the axial square groove 32 are spirally distributed on the circumference of the body 10.

Referring to fig. 5, the spacer 6 includes a spacer metal 35 and a spacer rubber 36, and the spacer metal 35 and the spacer rubber 36 are vulcanized integrally.

Referring to fig. 8 and 9, the mandrel 19 is provided with a cable connection hole 45 and two pipeline connection holes 46, the cable connection hole 45 is communicated with the cable channel 39, the cable connection hole 45 is provided with threads 38 to be connected with the cable plug 11, and is provided with sealing threads 37 to be connected with the cable and sealed, the two pipeline connection holes 46 are respectively communicated with the two hydraulic holes 41, and the pipeline connection holes are provided with sealing threads 40 to be connected with the hydraulic control pipeline. The cable channel 39 and the two hydraulic bores 41 terminate with sealing threads 42 for mounting the sealing pin 20. The two hydraulic holes 41 are respectively provided with a bypass hole 43, and the bypass holes 43 are circumferentially and spirally distributed on the mandrel 19. The mandrel is provided with a square groove 44 for mounting the cable joint 5.

Referring to fig. 10, the contact block 23 includes a contact block metal 47 and a contact block rubber 48, and the contact block metal 47 and the contact block rubber 48 are vulcanized into a single body.

Referring to fig. 11, the spacer 52 has a groove 49 therein and a communication hole 50 formed in the circumferential direction.

Referring to fig. 12, the upper connector 15 is provided with three axial grooves 53 for passing through cables and hydraulic control lines.

The working principle of the underground hydraulic-electric connector is as follows:

the sealing thread 29 on the body 10 of the outer cylinder is connected with a cable, the lower end of the cable is connected with a downhole tool, the upper end of the cable is connected with the cable plug 11 on the thread 28, a flexible cable is arranged between the cable plug 11 and the cable joint 5, and the ring contact 4 is connected with the cable joint 5. Thus, the annular contact 4 is connected to the downhole tool via the components on the outer barrel and the cable, allowing an electrical path to be formed. Two pipeline connecting channels 30 on the body 10 of the outer cylinder are respectively connected to the downhole tool through hydraulic control pipelines. The sealing ring 7 isolates the annular contact 4 from downhole fluids in an initial state.

A threaded connection cable is sealed at 37 on the spindle 19 of the plug, the lower end of the cable being connected to the cable plug 11 on threads 38, the upper end of the cable being connected to the surface control system. A flexible cable is arranged between the cable plug 11 and the cable connector 5, and the cable connector 5 is connected with the contact 24. The contacts 24 are thus connected to the ground control system via the components on the plug and the cable, and an electrical path can be formed. Two pipeline connecting holes 46 on the mandrel 19 are respectively connected with two hydraulic control pipelines through the sealing threads 40, and the hydraulic control pipelines are connected to a ground control system. Initially, gland 22 isolates contacts 24 from downhole fluids.

The plug is inserted into the outer cylinder, the right end of the sealing sleeve 22 is abutted against the isolation sleeve rubber 36, the contact seat rubber 48 is abutted against the upper part of the sealing ring 7 and is continuously pressed downwards, the sealing sleeve 22 moves upwards to compress the spring 21 relative to the mandrel 19, the sealing ring 7 moves downwards to compress the spring 8, the circular ring contact 4 is contacted with the contact 24, and the outer cylinder is communicated with an electronic channel of the socket. After the plug is inserted into the position, the two ball sealing holes 27 on the body 10 are respectively positioned between the three sealing modules 51 on the plug, and the two bypass holes 43 on the plug are respectively communicated with the two ball sealing holes 27 on the outer cylinder, so that the hydraulic control pipeline of the plug is communicated with the hydraulic control pipeline of the outer cylinder. After the cable and the hydraulic control pipeline are communicated, the underground tool can be controlled through the ground control system.

The plug is pulled out of the outer barrel, and the sealing ring 7 returns to the initial position under the action of the spring 8, so that the annular contact 4 is isolated from downhole liquid. Seal 22 returns to its original position under the action of spring 21, isolating contact 24 from downhole fluids.

Due to the design of the outer cylinder and the plug, when the well completion pipe string needs to be maintained, the outer cylinder and the tool pipe string at the lower part of the outer cylinder do not need to be pulled out, and only the plug and tools above the plug are pulled out. When the well completion pipe string is put in, the plug is inserted into the outer barrel, and the ground control system can still control the downhole tool. Therefore, the working efficiency is greatly improved, and the cost is reduced.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.