阅读说明：本技术 用于分层注水的安全接头 (Safety joint for separate layer water injection ) 是由 李培江 刘波 王善永 姚静 李强 宋鹤 缐芳 于 2020-06-23 设计创作，主要内容包括：本发明提供一种用于分层注水的安全接头,用于解决现有技术中在进行打水压过程中,销钉容易断裂的问题。包括：公接头,所述公接头在轴向上贯通,所述公接头末端为台阶空心轴结构,所述台阶空心轴结构外壁上设有销孔；所述公接头上设有活塞组件,所述活塞组件包括活塞体,所述活塞体能够在所述公接头的径向上移动；母接头,所述母接头在轴向上贯通,所述母接头末端设有第一台阶内孔,所述台阶空心轴结构插入到所述第一台阶内孔内且密封配合,所述母接头上安装有销钉,所述销钉径向贯穿所述母接头的侧壁且所述销钉插入到所述销孔内；母接头上设有顶回组件,所述顶回组件包括弹性件和顶头,所述顶头表面为弧面结构。能够避免在加压过程中销钉断裂。(The invention provides a safety joint for layered water injection, which is used for solving the problem that a pin is easy to break in the process of water pressure pumping in the prior art. The method comprises the following steps: the male connector is axially communicated, the tail end of the male connector is of a step hollow shaft structure, and a pin hole is formed in the outer wall of the step hollow shaft structure; the male connector is provided with a piston assembly, the piston assembly comprises a piston body, and the piston body can move in the radial direction of the male connector; the female joint is axially communicated, a first step inner hole is formed in the tail end of the female joint, the step hollow shaft structure is inserted into the first step inner hole and is in sealing fit with the first step inner hole, a pin is mounted on the female joint, and the pin radially penetrates through the side wall of the female joint and is inserted into the pin hole; be equipped with on the female joint and push back the subassembly, it includes elastic component and top to push back the subassembly, the top surface is ARC structure. The pin can be prevented from breaking during the pressing.)

1. A safety joint for stratified water injection comprising:

the male connector is axially communicated, the tail end of the male connector is of a step hollow shaft structure, and a pin hole is formed in the outer wall of the step hollow shaft structure;

the male connector is provided with a piston assembly, the piston assembly comprises a piston body, and the piston body can move in the radial direction of the male connector;

the female joint is axially communicated, a first step inner hole is formed in the tail end of the female joint, the step hollow shaft structure is inserted into the first step inner hole and is in sealing fit with the first step inner hole, a pin is mounted on the female joint, and the pin radially penetrates through the side wall of the female joint and is inserted into the pin hole;

the piston body is arranged in the male connector, the female connector is provided with a push-back assembly, the push-back assembly comprises an elastic piece and a push head, the elastic piece is used for pushing the push head out towards the radial inner side, when the push head is pushed out, the push head pushes the piston body back into the male connector, and the surface of the push head is of an arc surface structure.

2. Safety joint for stratified water injection as claimed in claim 1, wherein: the pin and the pin hole are in interference fit.

3. Safety joint for stratified water injection as claimed in claim 1, wherein: the end face of the male connector is in contact with the inner step of the female connector, and the end face of the female connector is in contact with the outer step of the male connector.

4. Safety joint for stratified water injection as claimed in claim 1, wherein: the piston assembly further comprises a piston seat, the piston seat is fixed on the male connector through threads, a first sealing ring is sleeved outside the piston seat, the piston body is arranged in the piston seat, and a second sealing ring is sleeved outside the piston body.

5. Safety joint for stratified water injection as claimed in claim 4, wherein: the piston body is the solid axial structure of step, the piston seat is equipped with the second step hole, the piston body is arranged in the second step hole, the macropore position of second step hole is equipped with the screens piece, the screens piece is used for limiting the piston body is close to the distance of public joint inner chamber, the pressure hole has been seted up on the screens piece, the pressure hole is used for letting the fluid pass through and use on the piston body.

6. Safety joint for stratified water injection as claimed in claim 1, wherein: the screens piece is made by elastic material, the elastic component is ring structure just the deformation breach has been seted up to the elastic component, the both ends of elastic component are equipped with the locking mounting hole.

7. Safety joint for stratified water injection as claimed in claim 1, wherein: the ejection assembly further comprises a mounting seat, the mounting seat is mounted on the female joint through threads, and the elastic piece is arranged in the mounting seat.

8. Safety joint for stratified water injection as claimed in claim 7, wherein: the ejector is provided with a guide rod and a clamping disc, the guide rod is fixed on the clamping disc, the elastic piece is located in a space formed by the clamping disc and the mounting seat, and the ejector is fixed on the clamping disc.

9. Safety joint for stratified water injection as claimed in claim 1, wherein: the top is of a hemispherical structure.

10. Safety joint for stratified water injection as claimed in claim 1, wherein: and the inner wall of the female connector and the outer wall of the male connector are sealed by at least one third sealing ring.

Technical Field

The invention relates to the field of petroleum equipment, in particular to a safety joint for separated layer water injection.

Background

In the oil field production increasing process, separate-layer water injection, packing, pressurization and oil displacement are often needed. At this time, when the casing is lowered for water injection, a safety joint needs to be arranged on the pipe column to prevent the pipe column from being broken due to excessive pressure. After the safety joint bears a certain pressure value, the safety pin is sheared, and the pressure is unloaded, so that the pipe column and the packer are protected, and a well-remaining fishing component is provided for subsequent well repair.

When the layered water injection well is normally used, water needs to be pumped for sealing, and the sealing can be explained in the field of oil fields as follows: the medium in the pipe is layered to be sealed, and the thrust force caused by the pressure of the water pressure and the pressure of the right step of the pin is larger than the shearing force of the design pin.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a safety joint for stratified water injection, which solves the problem of the prior art that a pin is easily broken during the water pressure pumping process.

To achieve the above and other related objects, the present invention provides a safety joint for stratified water injection, comprising:

the male connector is axially communicated, the tail end of the male connector is of a step hollow shaft structure, and a pin hole is formed in the outer wall of the step hollow shaft structure;

the male connector is provided with a piston assembly, the piston assembly comprises a piston body, and the piston body can move in the radial direction of the male connector;

the female joint is axially communicated, a first step inner hole is formed in the tail end of the female joint, the step hollow shaft structure is inserted into the first step inner hole and is in sealing fit with the first step inner hole, a pin is mounted on the female joint, and the pin radially penetrates through the side wall of the female joint and is inserted into the pin hole;

the piston body is arranged in the male connector, the female connector is provided with a push-back assembly, the push-back assembly comprises an elastic piece and a push head, the elastic piece is used for pushing the push head out towards the radial inner side, when the push head is pushed out, the push head pushes the piston body back into the male connector, and the surface of the push head is of an arc surface structure.

Optionally, the pin and the pin hole are in interference fit.

Optionally, the end surface of the male connector contacts with the inner step of the female connector, and the end surface of the female connector contacts with the outer step of the male connector.

Optionally, the piston assembly further includes a piston seat, the piston seat is fixed on the male connector through threads, a first sealing ring is sleeved outside the piston seat, the piston body is arranged in the piston seat, and a second sealing ring is sleeved outside the piston body.

Optionally, the piston body is a solid shaft structure with steps, the piston seat is provided with a second step inner hole, the piston body is arranged in the second step inner hole, a clamping piece is arranged at the position of a large hole of the second step inner hole and used for limiting the distance between the piston body and the inner cavity of the male connector, a pressure hole is formed in the clamping piece, and the pressure hole is used for allowing fluid to pass through and act on the piston body.

Optionally, the screens piece is made by elastic material, the elastic component is ring structure just the deformation breach has been seted up to the elastic component, the both ends of elastic component are equipped with the locking mounting hole.

Optionally, the push-back assembly further comprises a mounting seat, the mounting seat is mounted on the female joint through threads, and the elastic piece is arranged in the mounting seat.

Optionally, a guide rod and a clamping disc are arranged on the top head, the guide rod is fixed to the clamping disc, the elastic piece is located in a space formed by the clamping disc and the mounting seat, and the top head is fixed to the clamping disc.

Optionally, the plug is of a hemispherical structure.

Optionally, the inner wall of the female connector and the outer wall of the male connector are sealed by at least one third sealing ring.

As described above, the safety joint for separated layer water injection according to the present invention has at least the following advantages:

through the cooperation of the piston assembly and the ejecting component, in the water pressure process, water pressure can act on the piston body to enable the piston body to move towards the radial outer side, the ejecting component is compressed, at the moment, the piston body is inserted into the female connector from the male connector, the sharing of axial shearing force is realized, and therefore the pin is prevented from being cut off in the water pressure process, when the water pressure is unloaded, the piston body is ejected back by the ejecting component, because the ejecting head is of an arc-shaped surface structure, namely when the ejecting head receives the axial shearing force, the axial shearing force can press the ejecting head back into the female connector, at the moment, the axial shearing force is borne by the pin, and when the system is blocked, the axial force is greater than the pin shearing force, the pin can be cut off; the safety protection function is achieved.

Drawings

Fig. 1 shows a schematic view of a safety joint for stratified water injection according to the present invention.

Fig. 2 shows a schematic view of the safety joint for stratified water injection and the branch pipe of the present invention.

Element number description: the pin comprises a male connector 1, a female connector 2, a pin hole 11, a piston assembly 3, a piston body 31, a pin 21, a push-back assembly 4, an elastic element 41, a push head 42, a piston seat 32, a first sealing ring 321, a second sealing ring 311, a clamping element 322, a mounting seat 43, a guide rod 421, a clamping disc 422, a branch pipe 5, a threaded connector 51 and a third sealing ring 6.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to fig. 1-2. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so as to be understood and read by those skilled in the art, and therefore, the present disclosure is not limited to the conditions of the present disclosure, and any modifications of the structures, the changes of the ratios, or the adjustments of the sizes, should fall within the scope of the present disclosure without affecting the functions and the achievable purposes of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

The following examples are for illustrative purposes only. The various embodiments may be combined, and are not limited to what is presented in the following single embodiment.

Referring to fig. 1 to 2, the present invention provides an embodiment of a safety joint for separated layer water injection, including: the connector comprises a male connector 1 and a female connector 2, wherein the male connector 1 is axially communicated, the tail end of the male connector 1 is of a step hollow shaft structure, and a pin hole 11 is formed in the outer wall of the step hollow shaft structure; a piston assembly 3 is arranged on the male connector 1, the piston assembly 3 comprises a piston body 31, and the piston body 31 can move in the radial direction of the male connector 1; the female joint 2 is axially communicated, a first step inner hole is formed in the tail end of the female joint 2, the step hollow shaft structure is inserted into the first step inner hole and is in sealing fit with the first step inner hole, a pin 21 is installed on the female joint 2, the pin 21 radially penetrates through the side wall of the female joint 2, and the pin 21 is inserted into the pin hole 11; the female connector 2 is provided with a push-back assembly 4, the push-back assembly 4 comprises an elastic part 41 and a push-head 42, the elastic part 41 is used for pushing the push-head 42 out towards the radial inner side, when the push-head 42 is pushed out, the push-head 42 pushes the piston body 31 back into the male connector 1, and the surface of the push-head 42 is of an arc surface structure. Through the cooperation of the piston assembly 3 and the push-back assembly 4, in the water pressure process, water pressure can act on the piston body 31, so that the piston body 31 moves towards the radial outer side, the push-back assembly 4 is compressed, at the moment, the piston body 31 is inserted into the female connector 2 from the male connector 1, and the sharing of axial shearing force is realized, so that the pin 21 is prevented from being cut off in the water pressure process, when the water pressure is unloaded, the piston body 31 is pushed back by the push-back assembly 4, because the push head 42 is of an arc-surface structure, namely when the push head 42 receives the axial shearing force, the push head 42 can be pressed back into the female connector 2 by the axial shearing force, at the moment, the axial shearing force is borne by the pin 21, and when the system is blocked, the axial force is greater than the shearing force of the pin; the safety protection function is achieved. In fig. 2, two ends of the safety joint are respectively matched and connected with two branch pipes 5 through threaded connectors 51, in fig. 2, one of the two branch pipes is connected through internal threads, the other branch pipe is connected through external threads, and the inner diameter of the branch pipe 5 is smaller than the diameter of the safety joint, so that an inner step structure is formed between the branch pipe 5 and the safety joint, axial tension is generated, and axial shearing force is generated at the position of the pin 21.

In this embodiment, referring to fig. 1 to 2, the pin 21 and the pin hole 11 are in interference fit. The interference fit enables the pin 21 to be stressed more uniformly when being subjected to shearing force, and stress concentration is avoided.

In this embodiment, referring to fig. 1 to 2, the end surface of the male connector 1 contacts with the inner step of the female connector 2, and the end surface of the female connector 2 contacts with the outer step of the male connector 1. The angle of the inner step can be a right angle or other angles, and is not limited herein; in order to eliminate the additional stress of the pin shaft caused by the pressure bearing on the end face of the safety joint and increase the reliability of the shearing stress of the pin shaft, O-shaped sealing rings can be arranged on the end faces of the male joint 1 and the female joint 2, so that water can be prevented from entering the end faces of the male joint 1 and the female joint 2 or reduced, and the pressure borne by the end faces can be reduced.

In this embodiment, referring to fig. 1 to fig. 2, the piston assembly 3 further includes a piston seat 32, the piston seat 32 is fixed on the male connector 1 by a screw thread, a first sealing ring 321 is sleeved outside the piston seat 32, the piston body 31 is disposed inside the piston seat 32, and a second sealing ring 311 is sleeved outside the piston body 31. By providing the first seal ring 321 and the second seal ring 311, the liquid inside the safety joint can be prevented from leaking from the position of the piston body 31 and the outer wall of the piston seat 32.

In this embodiment, referring to fig. 1 to fig. 2, the piston body 31 is a stepped solid shaft structure, the piston seat 32 is provided with a second stepped inner hole, the piston body 31 is disposed in the second stepped inner hole, a position of a large hole of the second stepped inner hole is provided with a position-limiting element 322, the position-limiting element 322 is used for limiting a distance of the piston body 31 near the inner cavity of the male connector 1, and the position-limiting element 322 is provided with a pressure hole, and the pressure hole is used for allowing a fluid to pass through and act on the piston body 31. The limiting displacement of piston body 31 to the radial inboard motion has been realized to screens piece 322, and through the setting of pressure hole, let fluid can produce pressure to piston body 31 through the pressure hole simultaneously, and piston body 31 pressurized back radial outside motion just inserts female joint 2 in to the realization is to the sharing of the axial shear force of round pin axle in the pressurization process. Specifically optionally, the clamping member 322 is made of an elastic material, the elastic member 41 is of an annular structure, the elastic member 41 is provided with a deformation notch, and two ends of the elastic member 41 are provided with locking mounting holes. Screens piece 322 that elastic material made, and set up the deformation breach and make screens piece 322 can radially warp, make things convenient for screens piece 322 to install at the second step internal hole, concrete open ring groove in the big hole position of second step internal hole, then screens piece 322 card is in the ring groove, in order to let the better fixed in position of screens piece 322, can set up the locking mounting hole at the both ends of screens piece 322, pass the relative position that locking mounting hole realized screens piece 322 and piston seat 32 through axial bolt and fix.

In this embodiment, referring to fig. 1 to fig. 2, the retraction assembly 4 further includes a mounting seat 43, the mounting seat 43 is mounted on the female connector 2 through a screw thread, and the elastic element 41 is disposed in the mounting seat 43. The installation and fixation are realized through the thread structure, the structure is simple, and the processing and the installation are both convenient.

In this embodiment, referring to fig. 1 to fig. 2, a guide rod 421 and a positioning disk 422 are disposed on the plug 42, the guide rod 421 is fixed on the positioning disk 422, the elastic element 41 is located in a space formed by the positioning disk 422 and the mounting seat 43, and the plug 42 is fixed on the positioning disk 422. Through the arrangement of the guide rod 421, the elastic member 41 is not easy to slip off from the plug 42, the specific elastic member 41 can be selected as a disc spring, the positioning disc 422 enables the plug 42 to enter the inner wall of the extending female joint 2 and then push the piston body 31 to share the axial shearing force, and the other parts of the ejection assembly are arranged in the mounting seat 43. Specifically, optionally, the plug 42 has a hemispherical structure. The hemispherical head 42 allows for accommodation of forces at various angles without concern for installation orientation during safety.

In this embodiment, referring to fig. 1 to 2, the inner wall of the female connector 2 and the outer wall of the male connector 1 are sealed by at least one third sealing ring 6. The fluid inside the safety joint is prevented from leaking, and when the end surfaces of the female joint 2 and the male joint 1 are provided with O-shaped sealing rings, the third sealing ring 6 at the position plays a role in improving the sealing performance.

In conclusion, through the cooperation of the piston assembly 3 and the push-back assembly 4, in the process of water pressure, water pressure can act on the piston body 31 to enable the piston body 31 to move towards the radial outer side, the push-back assembly 4 is compressed, at the moment, the piston body 31 is inserted into the female connector 2 from the male connector 1, the sharing of axial shear force is realized, so that the pin 21 is prevented from being sheared in the process of water pressure, when the water pressure is unloaded, the piston body 31 is pushed back by the push-back assembly 4, at the moment, the axial shear force is borne by the pin 21, and when the system is blocked, the axial force is greater than the shear force of the pin 21, the pin 21 is cut off; the safety protection function is achieved.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.