CN215408537U

CN215408537U - Float valve for drilling tool

Info

Publication number: CN215408537U
Application number: CN202120624368.0U
Authority: CN
Inventors: 鲁鹏飞; 赵润琦; 孙成龙; 闫玉鹏
Original assignee: Sinopec Oilfield Service Corp; Sinopec Zhongyuan Petroleum Engineering Co Ltd; Drilling Engineering Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Current assignee: Sinopec Oilfield Service Corp; Sinopec Zhongyuan Petroleum Engineering Co Ltd; Drilling Engineering Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2022-01-04
Anticipated expiration: 2031-03-26

Abstract

The utility model provides a floating valve of a drilling tool, which is an arrow-shaped floating valve and comprises a cup-shaped valve core body and a valve seat (8) sleeved on the outer surface of the valve core body, wherein a first sealing ring (9) matched with the valve seat is arranged on the outer surface of the valve core body, the bottom of the valve core body is closed, a flow passage hole penetrating through the inner side wall of the valve core body to the outer surface is formed in the inner side wall of the valve core body, and the first sealing ring is positioned between the flow passage hole and the bottom of the valve core body. The valve core body of the drilling tool floating valve provided by the utility model is not easy to be eccentric and worn, and the sealing element between the valve core body and the valve seat is not easy to be eroded and damaged.

Description

Float valve for drilling tool

Technical Field

The utility model relates to the technical field of drilling, in particular to a floating valve of a drilling tool.

Background

In the drilling of petroleum and natural gas, a float valve is required to be connected in a drill string, so that the drilling fluid can pass through in a single direction. In traditional float valve structure, the uide pin is connected to toper case body below, and drilling fluid can promote the case body and compress the spring around the uide pin when one-way through the float valve, thereby realizes moving down of case body and opens the runner.

The above-described float valve structure has the following disadvantages: the sealing element is in a straight surface fluid state, so that the sealing element is easy to erode and damage; the centering effect of the guide pin is poor; friction between the guide pin and the valve seat is easy to wear, so that the centering effect of the conical valve core body and the valve seat is further deteriorated, the sealing element is easy to eccentric wear, and the sealing effect is deteriorated. Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a float valve in which a seal is not easily damaged by erosion and a valve body is not easily worn.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a floating valve for a drilling tool, in which a valve core body of the floating valve for a drilling tool is not prone to eccentric wear, and a sealing member between the valve core body and a valve seat is not prone to erosion damage.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a drilling tool float valve, drilling tool float valve is arrow shape float valve, including cup-shaped case body with cup joint in the disk seat of the surface of case body, the surface of case body be provided with the first sealing washer of disk seat complex, the bottom of case body is sealed, the inside wall of case body is seted up and is link up the runner hole to the surface, first sealing washer be located the runner hole with between the bottom of case body.

Optionally, in the above drilling tool float valve, the valve seat is disposed in an inner cavity of a float valve outer body, and a centering body that is matched with an inner wall of the float valve outer body is disposed circumferentially on an upper portion of an outer surface of the valve core body.

Optionally, in the above drilling tool float valve, the righting body is of a flange structure.

Optionally, in the above drilling tool float valve, a second sealing ring is arranged between the valve seat and the inner wall of the float valve outer body.

Optionally, in the above drilling tool float valve, the valve seat and the float valve outer body are of an integral structure.

Optionally, in the above floating valve of the drilling tool, the valve seat has an inner conical surface, a small end of the inner conical surface faces the upper portion of the valve core body, a sealing head with an outer conical surface is disposed at the bottom of the valve core body, and the outer conical surface of the sealing head is attached to the inner conical surface of the valve seat.

Optionally, in the above drilling tool float valve, the valve core body includes a cylinder, a plug, and the sealing head, the plug is fixedly connected to the lower port of the cylinder, and the sealing head is fixedly connected to the plug.

Optionally, in the above drilling tool float valve, the sealing head and the plug are of an integral structure.

Optionally, in the above drilling tool float valve, the plug is screwed with the cylinder.

Optionally, in the above drilling tool float valve, a third sealing ring matched with the valve seat is disposed on the outer surface of the valve core body, and the third sealing ring is located on the other side of the flow passage hole opposite to the first sealing ring.

According to the technical scheme, the valve core body is in a cup shape, the valve seat is sleeved on the outer surface of the valve core body, the valve core body can be righted, and the valve seat is fixedly arranged in the inner cavity of the outer body of the floating valve, so that the valve seat can ensure the centering effect of the valve core body and the outer body of the floating valve, and the valve core body is not prone to eccentric wear. In addition, the bottom of the valve core body is closed, the flow channel hole is formed in the inner side wall of the valve core body, and the first sealing ring which is arranged on the outer surface of the valve core body and matched with the valve seat is located between the flow channel hole and the bottom of the valve core body, so that when liquid flows out of the flow channel hole, the first sealing ring does not have straight-face fluid, and the first sealing ring is not easy to erode and damage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram illustrating the state of a float valve of a drilling tool according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic diagram illustrating a second state of a float valve of a drilling tool according to an embodiment of the present invention;

fig. 4 is a partially enlarged view of fig. 3.

Labeled as:

1. a float valve outer body; 2. an upper retainer ring; 3. a spring; 4. a barrel; 5. a lower retainer ring; 6. a second seal ring; 7. a third seal ring; 8. a valve seat; 9. a first seal ring; 10. a plug; 11. and (6) sealing the head.

Detailed Description

For the purpose of facilitating understanding, the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1 and 2, fig. 1 is a schematic view illustrating a state of a float valve of a drilling tool according to an embodiment of the present invention, and fig. 2 is a partially enlarged view of fig. 1. The float valve of the drilling tool provided by the embodiment of the utility model is an arrow-shaped float valve, and comprises a float valve outer body 1, a valve seat 8 and a valve core body, wherein the valve seat 8 is arranged in an inner cavity of the float valve outer body 1, the valve core body is in a cup shape, the bottom of the valve core body is closed, the valve seat 8 is sleeved on the outer surface of the valve core body, a first sealing ring 9 matched with the valve seat 8 is arranged on the outer surface of the valve core body, a flow passage hole penetrating through the inner side wall of the valve core body to the outer surface is formed in the inner side wall of the valve core body, and the first sealing ring 9 is positioned between the flow passage hole and the bottom of the valve core body.

As shown in fig. 2, in this embodiment, the valve core body includes a cylinder 4, a plug 10 and a sealing head 11, the plug 10 is fixedly connected to the lower port of the cylinder 4, and the sealing head 11 is fixedly connected to the plug 10. In a specific practical application, the plug 10 may be designed as a double-ended stud and is respectively in threaded connection with the cylinder 4 and the sealing head 11. For simplicity, the stopper 10 may be integrally formed with the barrel 4, or the stopper 10 may be integrally formed with the sealing head 11.

The disk seat 8 cup joints in the surface of case body, can guarantee case body and the centering effect of float valve external body 1, and in order to further improve the centering effect, in this embodiment, the upper portion of the surface of case body is provided with along circumference with the inner wall matched with of float valve external body 1 body of righting, as shown in fig. 2, the body of righting is the flange structure of barrel 4 upper end. In other embodiments, the centralizing body may also be in other structural forms, for example, a plurality of protrusions are circumferentially arranged on the outer surface of the valve core body as the upper centralizing body.

Referring to fig. 3 and 4, when the cylinder 4 moves downwards under the pressure of the drilling fluid, the centralizing body on the upper part of the cylinder 4 compresses the spring 3, and as can be seen from fig. 2 and 4, the downward movement of the cylinder 4 causes the flow passage hole formed in the lower part of the cylinder 4 to be gradually exposed from the lower end of the contact part of the valve seat 8 and the cylinder 4, and the fluid flows out of the flow passage hole, so that the downward flow communication function of the fluid is realized. When passing through, the first seal ring 9 is not subjected to erosion by the fluid because it has no straight surface fluid. In a specific practical application, the flow passage holes are usually designed as oblique holes with a certain angle, as shown in fig. 2, the flow passage holes in this embodiment are oblique holes with an angle of 45 °, but may also be other oblique angles, such as 30 ° or 50 °.

As shown in fig. 1, a step is processed in the inner cavity of the outer body 1 of the float valve, the lower end of the valve seat 8 is limited by the step, the upper end of the valve seat 8 is limited by a lower retainer ring 5 installed in the inner cavity of the outer body 1 of the float valve, the spring 3 is installed between the valve seat 8 and a centralizing body on the upper portion of the cylinder body 4, and an upper retainer ring 2 is further installed in the inner cavity of the outer body 1 of the float valve and used for limiting the valve core body. When a pump is not started in a drilling site and no drilling fluid passes through the cylinder body 4, the pre-compression state of the spring 3 per se causes pre-elasticity, so that the centralizing body on the upper part of the cylinder body 4 props against the upper retainer ring 2, and at the moment, the flow passage hole on the lower part of the cylinder body 4 is not exposed from the lower end of the contact part of the valve seat 8 and the cylinder body 4, namely, the flow passage is closed.

As shown in fig. 2, the sealing head 11 has an external conical surface, the valve seat 8 has an internal conical surface, the small end of the internal conical surface faces the upper part of the valve core body, and the external conical surface of the sealing head 11 is attached to the internal conical surface of the valve seat 8, so that the liquid upstream prevention capability can be improved when the flow channel is closed.

In this embodiment, the valve seat 8 and the outer body 1 of the float valve are of a split structure, and in order to improve the sealing performance, a second sealing ring 6 is arranged between the valve seat 8 and the inner wall of the outer body 1 of the float valve. In other embodiments, the valve seat 8 can be designed as a one-piece structure with the float valve outer body 1. In order to prevent the liquid from passing through the place except the flow passage hole, in the embodiment, the outer surface of the cylinder 4 is further provided with a third sealing ring 7 which is matched with the valve seat 8, and the third sealing ring 7 is positioned at the other side of the flow passage hole relative to the first sealing ring 9.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a drilling tool float valve, drilling tool float valve is arrow shape float valve, its characterized in that, including cup-shaped case body with cup joint in disk seat (8) of the surface of case body, the surface of case body be provided with disk seat (8) complex first sealing washer (9), the bottom of case body is sealed, the inside wall of case body is seted up and is link up the runner hole to the surface, first sealing washer (9) are located the runner hole with between the bottom of case body.

2. The drilling tool float valve according to claim 1, the valve seat (8) is arranged in an inner cavity of the float valve outer body (1), characterized in that the upper part of the outer surface of the valve core body is circumferentially provided with a centralizing body which is matched with the inner wall of the float valve outer body (1).

3. The drilling tool float valve of claim 2, wherein the centralizing body is a flange structure.

4. The drilling tool float valve according to claim 2, characterized in that a second sealing ring (6) is arranged between the valve seat (8) and the inner wall of the float valve outer body (1).

5. The drilling tool float valve according to claim 2, characterized in that the valve seat (8) is of one-piece construction with the float valve outer body (1).

6. The drilling tool float valve according to any one of claims 1 to 5, characterized in that the valve seat (8) has an inner conical surface, the small end of the inner conical surface faces the upper part of the valve core body, the bottom of the valve core body is provided with a sealing head (11) with an outer conical surface, and the outer conical surface of the sealing head (11) is attached to the inner conical surface of the valve seat (8).

7. The drilling tool float valve according to claim 6, wherein the valve core body comprises a cylinder (4), a plug (10) and the sealing head (11), the plug (10) is fixedly connected with the lower port of the cylinder (4), and the sealing head (11) is fixedly connected with the plug (10).

8. The drilling tool float valve according to claim 7, characterized in that the sealing head (11) is of one-piece construction with the bottom sub (10).

9. Drilling tool float valve according to claim 8, characterized in that the plug (10) is screwed to the cylinder (4).

10. The drilling tool float valve according to claim 6, characterized in that the outer surface of the spool body is provided with a third sealing ring (7) cooperating with the valve seat (8), the third sealing ring (7) being located on the other side of the flow passage hole from the first sealing ring (9).