CN211851772U

CN211851772U - One-way valve

Info

Publication number: CN211851772U
Application number: CN201922326330.0U
Authority: CN
Inventors: 乔根才; 罗敬兵; 李春保; 刘彦平; 刘君林; 许小玲
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-11-03
Anticipated expiration: 2029-12-20

Abstract

The disclosure relates to a one-way valve, and belongs to the field of oil exploitation. The check valve comprises a valve body, a ball seat, a valve ball, a spring and a limit cover. The ball seat is connected with the valve body, the valve body is provided with a valve body through hole, the ball seat is provided with a ball seat through hole, the limiting cover is sleeved in the valve body through hole, the limiting cover is provided with a first through hole which is communicated with the valve body through holes on two sides, and one end of the ball seat is sleeved in one end of the valve body through hole. One end of the spring is abutted to the limiting cover, the other end of the spring is connected with the valve ball, and in an initial state, the spring is in a compression state, and the valve ball blocks the through hole of the ball seat. The side wall of the valve body is provided with a ring-shaped bulge facing the outer side of the one-way valve. The outer diameter of the annular bulge is larger than that of other parts, and when the position of the oil pipe deviates, the annular bulge can be in contact with the inner wall of the sleeve, so that the oil pipe is prevented from continuously deviating. The annular bulge plays a role in righting the oil pipe, tools such as extra centralizers are prevented from being added underground, and the number of underground tools is reduced.

Description

One-way valve

Technical Field

The disclosure relates to the field of oil exploitation, in particular to a one-way valve.

Background

The check valve is widely applied to oil exploitation, and the flow direction of downhole liquid can be controlled through the check valve.

The well comprises a casing and a tubing, the tubing being located in the casing, an annulus being formed between the tubing and the casing. Because there is the space between oil pipe and the sleeve pipe, oil pipe can take place the skew in the sleeve pipe, needs to install centralizer in the pit, right oil pipe, makes oil pipe center in the sleeve pipe. Meanwhile, a one-way valve needs to be arranged underground.

SUMMERY OF THE UTILITY MODEL

The disclosed embodiment provides a check valve, which can reduce the number of downhole tools. The technical scheme is as follows:

the present disclosure provides a one-way valve, comprising a valve body, a ball seat, a valve ball, a spring and a limit cover;

the ball seat is connected with the valve body, the valve body is provided with a valve body through hole, the ball seat is provided with a ball seat through hole, the limiting cover is sleeved in the valve body through hole, a first through hole communicated with the valve body through holes on two sides is formed in the limiting cover, and one end of the ball seat is sleeved in one end of the valve body through hole;

one end of the spring is abutted against the limiting cover, the other end of the spring is connected with the valve ball, and in an initial state, the spring is in a compressed state, and the valve ball blocks the through hole of the ball seat;

the side wall of the valve body is provided with a ring of annular bulges facing the outer side of the one-way valve.

In one implementation manner of the embodiment of the present disclosure, along the circumferential direction of the annular protrusion, a plurality of strip-shaped grooves are arranged on the annular protrusion at intervals, and the strip-shaped grooves are arranged along the length direction of the valve body and penetrate through the annular protrusion.

In one implementation of the disclosed embodiment, the outer diameter of the annular protrusion is smaller than the inner diameter of the casing in the well in which the one-way valve is installed, and the difference between the outer diameter of the annular protrusion and the inner diameter of the casing in the well is between 2 and 3 mm.

In one implementation of the disclosed embodiment, the ball seat is removably coupled to the valve body.

In one implementation of the disclosed embodiment, the stop cap is removably coupled to the valve body.

In one implementation manner of the embodiment of the present disclosure, the limiting cover further has a plurality of second through holes, the second through holes are all communicated with the valve body through hole, and the second through holes are arranged around the first through hole at intervals.

In one implementation manner of the embodiment of the present disclosure, a circle of limiting groove is formed on the end surface of the limiting cover, which is close to the spring, and one end of the spring is located in the limiting groove.

In one implementation of the disclosed embodiment, the check valve further includes a seal ring located between the valve body and the ball seat.

In one implementation of the disclosed embodiment, the diameter of the end of the ball seat through hole close to the valve body is larger than the diameter of the end of the ball seat through hole far away from the valve body.

In one implementation of the disclosed embodiment, the diameter of the end of the valve body through hole away from the ball seat is larger than the diameter of the end of the valve body through hole close to the ball seat.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

the check valve comprises a valve body, a ball seat, a valve ball, a spring and a limiting cover, wherein the valve body is used for installing the ball seat, the valve ball, the spring and the limiting cover, the limiting cover is used for installing the spring, and the ball seat, the spring and the limiting cover are used for fixing the valve ball so as to plug the ball seat through hole. Connect this disclosed check valve on oil pipe, the liquid in the oil pipe passes through valve body through-hole, first through-hole and ball seat through-hole circulation. When liquid flows to the ball seat from the valve body, the spring and the liquid both provide a force for the valve ball to face the ball seat, so that the valve ball is in sealing contact with the through hole of the ball seat, and the liquid cannot flow from the through hole of the ball seat; when liquid flows to the valve body from the ball seat, the liquid pushes the valve ball, a force towards the valve body is given to the valve ball, the valve ball leaves the ball seat through hole, and the liquid flows through the ball seat through hole, the first through hole and the valve body through hole, so that the function of the one-way valve is realized. The side wall of the valve body is provided with a ring-shaped bulge facing the outer side of the one-way valve. The outer diameter of the annular bulge is larger than that of other parts, and when the position of the oil pipe deviates, the annular bulge can be in contact with the inner wall of the sleeve, so that the oil pipe is prevented from continuously deviating. Annular protruding plays the effect of rightting in other words to oil pipe, has replaced the centralizer, through with check valve and centralizer integration on same device, avoids increasing instruments such as extra centralizer in the pit, has reduced instrument quantity in the pit, makes things convenient for equipment fixing such as oil pipe in the pit more.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a check valve provided in an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a position-limiting cover according to an embodiment of the present disclosure;

FIG. 3 is a bottom view of a one-way valve provided by embodiments of the present disclosure;

fig. 4 is a top view of a position limiting cover according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a check valve provided in an embodiment of the present disclosure. Referring to fig. 1, the check valve includes a valve body 1, a ball seat 2, a valve ball 3, a spring 4, and a limit cap 5. The ball seat 2 is connected with the valve body 1, the valve body 1 is provided with a valve body through hole 11, the ball seat 2 is provided with a ball seat through hole 21, the limiting cover 5 is sleeved in the valve body through hole 11, a first through hole 51 communicated with the valve body through holes 11 on two sides is arranged on the limiting cover 5, and one end of the ball seat 2 is sleeved in one end of the valve body through hole 11. One end of the spring 4 is abutted to the limiting cover 5, the other end of the spring 4 is connected with the valve ball 3, and in an initial state, the spring 4 is in a compressed state, and the valve ball 3 blocks the ball seat through hole 21. The side wall of the valve body 1 is provided with a ring-shaped projection 12 facing the outside of the check valve.

In the embodiment of the present disclosure, the check valve includes valve body 1, ball seat 2, valve ball 3, spring 4 and spacing lid 5, and valve body 1 is used for installing ball seat 2, valve ball 3, spring 4 and spacing lid 5, and spacing lid 5 is used for installing spring 4, and ball seat 2, spring 4 and spacing lid 5 are used for fixed valve ball 3, make valve ball 3 block up ball seat through-hole 21. The check valve of the present disclosure is connected to an oil pipe, and a liquid in the oil pipe circulates through the valve body through hole 11, the first through hole 51, and the ball seat through hole 21. When liquid flows from the valve body 1 to the ball seat 2, the spring 4 and the liquid give a force to the valve ball 3 towards the ball seat 2, so that the valve ball 3 is in sealing contact with the ball seat through hole 21, and at the moment, the liquid cannot flow from the ball seat through hole 21. When liquid flows from the ball seat 2 to the valve body 1, the liquid pushes the valve ball 3, the liquid gives the valve ball 3 a force toward the valve body 1, the valve ball 3 leaves the ball seat through hole 21, and the liquid circulates through the ball seat through hole 21, the first through hole 51, and the valve body through hole 11. The side wall of the valve body 1 is provided with a ring-shaped projection 12 facing the outside of the check valve. The outer diameter of the annular protrusion 12 is larger than that of other parts, and when the position of the oil pipe deviates, the annular protrusion 12 contacts with the inner wall of the casing pipe, so that the oil pipe is prevented from deviating continuously. Annular protrusion 12 plays the effect of rightting in other words to oil pipe, has replaced the centralizer, through with check valve and centralizer integration on same device, avoids increasing tools such as extra centralizer in the pit, has reduced instrument quantity in the pit, makes things convenient for equipment fixing such as oil pipe in the pit more.

The one-way valve can be applied to the water injection work of a water injection well, when the water well is subjected to sealing replacement operation construction, an underground tool (comprising a packer, a water distributor and the like) is connected with an oil pipe and then is put into the underground set position, the one-way valve is positioned at the bottommost end of the oil pipe, and sundries such as dead oil, sand grains and the like in the oil pipe can be possibly stuck on the valve ball 3 or the ball seat 2, so that the contact part of the valve ball 3 and the ball seat through hole 21 is not sealed, the sealing effect of a subsequent one-way valve is influenced, and the water injection work is further influenced. According to the one-way valve provided by the disclosure, the spring 4 is in a compression state in an initial state, the spring 4 in the compression state can enable the valve ball 3 to be abutted to the ball seat through hole 21, the one-way valve is in a closing state, and impurities such as dead oil and sand grains in the sleeve cannot enter the oil pipe, so that the safety and reliability of subsequent construction are ensured. Meanwhile, liquid in the sleeve is not easy to push the valve ball 3, the valve ball 3 is prevented from being separated from the ball seat through hole 21, and sundries are adhered to the contact position of the valve ball 3 and the ball seat through hole 21 to influence the sealing effect of the one-way valve.

In the disclosed embodiment, the liquid can circulate through the valve body through hole 11, and the valve body through hole 11 provides an installation space for the ball seat 2, the valve ball 3, the spring 4 and the limit cover 5. The limiting cover 5 is arranged in the valve body through hole 11, the spring 4 is convenient to install, the limiting cover 5 supports the spring 4, the spring 4 supports the valve ball 3 at the position of the ball seat through hole 21, and the valve ball 3 is prevented from moving. The first through hole 51 on the limiting cover 5 is communicated with the valve body through hole 11, when the one-way valve works, liquid can flow to the valve body through hole 11 from the ball seat through hole 21, and normal work of the one-way valve is guaranteed.

In the disclosed embodiment, the outer diameter of the annular protrusion 12 is smaller than the inner diameter of the casing in the well where the check valve is installed, and the difference between the outer diameter of the annular protrusion 12 and the inner diameter of the casing in the well is in the range of 2 to 3 millimeters (mm).

In this implementation, the outer diameter of the annular protrusion 12 may be determined according to the inner diameter of the sleeve. The external diameter of annular bulge 12 slightly is less than the well casing's of well internal diameter, guarantees to send into the check valve in the pit, and the liquid in the annular space between sleeve pipe and the oil pipe can flow, guarantees simultaneously that annular bulge 12 can play the effect of rightting, guarantees simultaneously that there is certain clearance to supply the liquid circulation between annular bulge 12 and the sleeve pipe.

For example, the outer diameter of the annular protrusion 12 may be 2 millimeters smaller than the inner diameter of the sleeve.

As shown in fig. 1, the diameter of the end of the valve body through hole 11 far from the ball seat 2 is larger than the diameter of the end of the valve body through hole 11 near the ball seat 2.

In this implementation, the inner diameter of the upper side of the valve body through hole 11 is larger than the diameter of the lower side of the valve body through hole 11, so that the limit cover 5 is convenient to install from the upper side of the valve body through hole 11.

Illustratively, the end of the valve body through hole 11 far away from the ball seat 2 adopts a two-stage stepped design, wherein the diameter of the valve body through hole 11 at the end is designed to be the largest so as to be matched and connected with an oil pipe. For example, the valve body through hole 11 of the valve body 1 can be in threaded connection with an oil pipe, so that the one-way valve can be conveniently installed and disassembled.

Illustratively, the connection of the valve body through hole 11 and the oil pipe has an internal thread (i.e., a female thread), and the oil pipe has an external thread (i.e., a male thread), and the check valve and the oil pipe are connected by the thread.

As shown in fig. 1, the diameter of the end of the ball seat through hole 21 close to the valve body 1 is larger than the diameter of the end of the ball seat through hole 21 far from the valve body 1.

In this implementation, the diameter of ball seat through-hole 21 and the contact department of valve ball 3 is great, can fix valve ball 3 in the ball seat through-hole 21 of the one end that is close to valve body 1 through spring 4, avoids valve ball 3 to rock in ball seat through-hole 21, guarantees valve ball 3's stability.

In this disclosed embodiment, the outer diameter of valve ball 3 is less than the diameter that the one end of ball seat through-hole 21 is close to valve body 1 to make this valve ball 3 can be supported into this through-hole by the spring, the outer diameter of valve ball 3 is greater than the diameter that the one end of valve body 1 was kept away from to ball seat through-hole 21, guarantees that this ball seat through-hole 21 can be plugged up to valve ball 3.

In an implementation manner of the embodiment of the present disclosure, the valve body 1 may be a steel valve body, and the ball seat 2 may be a steel ball seat, so as to ensure the strength of the check valve and prevent the check valve from being damaged due to collision with an underground tool during underground operation.

In an implementation manner of the embodiment of the present disclosure, the valve ball 3 may be a steel ball, so as to ensure the strength of the valve ball 3, and avoid the damage to the valve ball 3 caused by the friction and collision of impurities such as sand grains in the casing with the valve ball 3 in the process of putting the unidirectional valve into the well.

Illustratively, the steel material may be molybdenum-chromium alloy steel (chemical formula: CrMo), which has strong impact resistance and bending resistance. For example, the steel material may be 35CrMo, where 35 means that the mass fraction of carbon in the molybdenum-chromium alloy steel is about 0.35%.

In other implementations, the valve body 1, the ball seat 2 and the valve ball 3 may be made of other metals, alloys and non-metallic materials, and the disclosure is not limited to the aforementioned materials.

In one implementation of the disclosed embodiment, the ball seat 2 is removably connected to the valve body 1.

In this implementation, the ball seat 2 is detachably connected to the valve body 1, ensuring stability of the ball seat 2. Meanwhile, when the ball seat 2 or the valve body 1 is damaged, the parts are convenient to detach and replace, the whole one-way valve does not need to be replaced, and the cost is reduced.

Illustratively, one end of the valve body through hole 11 of the valve body 1, which is close to the ball seat 2, is provided with an internal thread, the ball seat 2 is provided with an external thread, and the ball seat 2 and the valve body 1 can be connected through the thread, so that the disassembly is convenient.

In one implementation of the disclosed embodiment, the limit cap 5 is removably connected to the valve body 1.

In this implementation, conveniently dismantle spacing lid 5, when spring 4 or valve ball 3 damaged, can dismantle spacing lid 5, take out spring 4 or valve ball 3, change.

Exemplarily, the limit cover 5 has an external thread, the inner side wall of the valve body 1 has an internal thread, and the limit cover 5 and the valve body 1 can be connected through the thread, thereby facilitating the disassembly.

Fig. 2 is a schematic structural diagram of a position-limiting cover according to an embodiment of the present disclosure. Referring to fig. 1 and 2, the limit cover 5 has a limit projection 54, and the limit projection 54 is located in the valve body through hole 11.

In this implementation, arranging the limit boss 54 facilitates the detachment of the limit cover 5, and mounting or detaching the limit cover 5 by screwing the limit boss 54.

In one implementation of the disclosed embodiment, the cross section of the limiting boss 54 may be hexagonal, so that the limiting boss 54 can be held to screw the limiting boss 54. In other implementations, the cross-section of the limit boss 54 may also be a triangle, a quadrilateral, or other irregular polygon, which is not limited by this disclosure.

Referring again to fig. 1 and 2, the end surface of the limit cover 5 close to the spring 4 is provided with a circle of limit groove 53, and one end of the spring 4 is positioned in the limit groove 53.

In this implementation, arrange spacing recess 53 on spacing lid 5, easy to assemble spring 4 places spring 4 in spacing recess 53, can fix spring 4, avoids the check valve at the in-process spring removal of work, conveniently dismantles spring 4 simultaneously.

Referring again to fig. 1, the check valve further includes a sealing ring 6, the sealing ring 6 being located between the valve body 1 and the ball seat 2.

In this implementation, arrange sealing washer 6 at the threaded connection department of valve body 1 and ball seat 2, guarantee the leakproofness of the threaded connection of valve body 1 and ball seat 2, avoid liquid to get into valve body 1 from the junction of valve body 1 and ball seat 2 in, influence the sealed effect of check valve.

The sealing ring 6 may be a silicone sealing ring, a rubber sealing ring, or a silicone rubber sealing ring, for example. For example, the seal ring 6 may be a high-elastic seal rubber ring.

As shown in fig. 1, two sealing rings 6 are arranged at the joint of the valve body 1 and the ball seat 2 to enhance the sealing performance at the joint of the valve body 1 and the ball seat 2. In other implementations, one or more sealing rings 6 are arranged at the junction of the valve body 1 and the ball seat 2.

As shown in fig. 1, one end of the ball seat 2 has a ball seat boss 22, and the ball seat boss 22 is located in the valve body through hole 11. The other end of the ball seat 2 is positioned outside the valve body through hole 11.

In this implementation, the ball seat 2 and the valve body 1 are connected by a ball seat boss 22, facilitating installation of the ball seat 2. Meanwhile, the ball seat 2 is prevented from being completely screwed into the valve body through hole 11, and the ball seat 2 is not easy to detach subsequently.

Fig. 3 is a bottom view of a check valve according to an embodiment of the present disclosure, and referring to fig. 3, a cross-section of the bottom of the other end of the ball seat 2 may be hexagonal, thereby facilitating installation of the ball seat 2. In other implementations, the cross-section of the bottom of the ball seat 2 may also be triangular, quadrilateral or other irregular polygon, which the present disclosure does not limit.

Referring to fig. 1 and 3, a plurality of strip grooves 121 are arranged on the annular protrusion 12 at intervals along the circumferential direction of the annular protrusion 12, and the strip grooves 121 are arranged along the length direction a of the valve body 1 and penetrate through the annular protrusion 12.

For example, when the check valve disclosed by the invention is applied to water injection work in oil production, liquid in an annular space between a casing and an oil pipe needs to flow through the annular protrusion 12, the strip-shaped groove 121 is arranged on the annular protrusion 12, and the liquid in the annular space can flow through the strip-shaped groove 121, and meanwhile, sundries in the annular space cannot be prevented from flowing to the bottom of a well.

As shown in fig. 3, six strip-shaped grooves 121 are arranged on the annular protrusion 12 to ensure that the liquid in the annular space can circulate. In other implementations, other numbers of strip-shaped grooves 121 may be arranged, which the present disclosure does not limit.

Fig. 4 is a top view of a position limiting cover according to an embodiment of the present disclosure. Referring to fig. 4, the position restricting cover 5 further has a plurality of second through holes 52, each of the plurality of second through holes 52 communicating with the valve body through hole 11, the plurality of second through holes 52 being arranged at intervals around the first through hole 51.

In this implementation, a plurality of second through holes 52 are arranged, and the valve body through hole 11 and the ball seat through hole 21 are communicated through the first through hole 51 and the plurality of second through holes 52, so that a sufficient amount of liquid can be circulated in the check valve during operation.

As shown in fig. 4, six second through holes 52 are arranged on the limiting cover 5 to ensure that enough liquid can flow in the check valve. In other implementations, other numbers of second through holes 52 may be arranged, which the present disclosure does not limit.

Exemplarily, when the one-way valve disclosed by the invention is applied to water injection work of oil exploitation, the one-way valve is positioned at the bottommost end of an oil pipe, a downhole tool is connected with the oil pipe and then is put into a set position underground, the valve ball 3 is propped against the ball seat through hole 21 by the spring 4, so that the one-way valve is in a closed state, and impurities such as dead oil and sand grains in a casing cannot enter the oil pipe, so that the one-way valve has a sand prevention effect and ensures the safety and reliability of subsequent construction. After the downhole tool is delivered to the designated position, the pump truck is used for pressurizing the interior of the oil pipe, the packer is set, the one-way valve has a righting function, the oil pipe can be righted, the downhole tool is centered in the sleeve, and the performance of the downhole tool is ensured. When a well is required to be washed, well washing liquid is injected into an annulus between the casing and the oil pipe from a wellhead, dead oil, sundries and the like in the annulus are replaced to the bottom of the well by the well washing liquid, then the valve ball 3 is jacked open from the bottom end of the one-way valve, flows into the oil pipe from the inside of the one-way valve, and finally returns to the ground, so that the well washing operation is completed.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. The check valve is characterized by comprising a valve body (1), a ball seat (2), a valve ball (3), a spring (4) and a limiting cover (5);

the ball seat (2) is connected with the valve body (1), the valve body (1) is provided with a valve body through hole (11), the ball seat (2) is provided with a ball seat through hole (21), the limiting cover (5) is sleeved in the valve body through hole (11), the limiting cover (5) is provided with a first through hole (51) communicated with the valve body through holes (11) on two sides, and one end of the ball seat (2) is sleeved in one end of the valve body through hole (11);

one end of the spring (4) is abutted against the limiting cover (5), the other end of the spring (4) is connected with the valve ball (3), the spring (4) is in a compressed state in an initial state, and the valve ball (3) blocks the ball seat through hole (21);

the side wall of the valve body (1) is provided with a ring of annular bulges (12) facing the outer side of the one-way valve.

2. The check valve according to claim 1, characterized in that a plurality of strip-shaped grooves (121) are arranged on the annular protrusion (12) at intervals along the circumferential direction of the annular protrusion (12), and the strip-shaped grooves (121) are arranged along the length direction (a) of the valve body (1) and penetrate through the annular protrusion (12).

3. A non-return valve according to claim 1, characterised in that the outer diameter of the annular projection (12) is smaller than the inner diameter of the casing in the well in which the non-return valve is installed, the difference between the outer diameter of the annular projection (12) and the inner diameter of the casing in the well being between 2 and 3 mm.

4. A non-return valve according to one of claims 1 to 3, characterised in that the ball seat (2) is detachably connected to the valve body (1).

5. A non-return valve according to one of claims 1 to 3, characterised in that the limit stop (5) is detachably connected to the valve body (1).

6. A non-return valve according to any of claims 1 to 3, characterised in that the limit cap (5) further has a plurality of second through holes (52), the plurality of second through holes (52) each communicating with the valve body through hole (11), the plurality of second through holes (52) being arranged at intervals around the first through hole (51).

7. A non-return valve according to any one of claims 1 to 3, characterised in that the end face of the stop cap (5) adjacent to the spring (4) has a ring of stop grooves (53), one end of the spring (4) being located in the stop grooves (53).

8. A one-way valve according to any one of claims 1 to 3, further comprising a sealing ring (6), the sealing ring (6) being located between the valve body (1) and the ball seat (2).

9. A one-way valve according to any one of claims 1 to 3, wherein the diameter of the end of the ball seat through hole (21) close to the valve body (1) is larger than the diameter of the end of the ball seat through hole (21) remote from the valve body (1).

10. A non-return valve according to any of claims 1 to 3, characterised in that the diameter of the end of the valve body through hole (11) remote from the ball seat (2) is larger than the diameter of the end of the valve body through hole (11) close to the ball seat (2).