CN111963092A

CN111963092A - Wellhead sealing device

Info

Publication number: CN111963092A
Application number: CN202010822685.3A
Authority: CN
Inventors: 赵凯杰; 韩书科; 庞亮; 刘越; 胡春军
Original assignee: Daqing Fulongda Petroleum Engineering Mechanical Equipment Co ltd
Current assignee: Daqing Fulongda Petroleum Engineering Mechanical Equipment Co ltd
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2020-11-20

Abstract

The invention discloses a wellhead sealing device, which relates to the technical field of oil well operation and comprises a box body, a bottom flange and a top cover, wherein the bottom flange is positioned at the bottom of the box body and used for being fixed at a wellhead; the top cover is positioned at the top of the box body, a first telescopic rod is arranged below the top cover, a first sealing plate is arranged below the first telescopic rod, and a second sealing plate is connected below the first sealing plate through a second telescopic rod; the oil outlet is connected with an oil storage tank through an oil outlet pipe. The invention improves the stability and reduces the damage of the sealing device.

Description

Wellhead sealing device

Technical Field

The invention relates to the technical field of oil well operation, in particular to a wellhead sealing device.

Background

Petroleum, one of the main objects of geological exploration, is a viscous dark brown liquid called "industrial blood", the upper part of the earth crust has petroleum storage, the main component is a mixture of various alkanes, cyclanes and aromatics, the petroleum is mainly used as fuel oil and gasoline, and is also a raw material of many chemical industry products, such as solution, fertilizer, pesticide and plastics, and is one of the most important energy sources in the world.

In the oil drilling and production process of petroleum, especially in the well repairing process, the phenomenon of oil-water ejection in an oil pipe is generally caused when the pipe is lifted, and great inconvenience is caused to construction operation. The wellhead device on the existing market is poor in stability, and when wellhead pressure is increased, the petroleum wellhead sealing device is damaged easily.

Therefore, there is a need for a wellhead sealing device to solve the above problems in the prior art.

Disclosure of Invention

The invention aims to provide a wellhead sealing device, which solves the problems in the prior art, improves the stability and reduces the damage of the sealing device.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a wellhead sealing device which comprises a box body, a bottom flange and a top cover, wherein the bottom flange is positioned at the bottom of the box body and used for being fixed at a wellhead, and a through hole is formed in the middle of the bottom flange; the top cover is positioned at the top of the box body, a first telescopic rod is arranged below the top cover, a first sealing plate is arranged below the first telescopic rod, and a second sealing plate is connected below the first sealing plate through a second telescopic rod; the oil outlet is connected with an oil storage tank through an oil outlet pipe.

Preferably, an elastic element is arranged below the second telescopic rod, the top of the elastic element is fixedly connected with the bottom of the second telescopic rod, and the bottom of the elastic element is fixedly connected with the top of the second sealing plate.

Preferably, the elastic element is a spring.

Preferably, the second telescopic rod and the elastic element are symmetrically provided with two groups.

Preferably, the oil outlets are provided with two oil outlets and comprise a first oil outlet and a second oil outlet, the first oil outlet is connected with a first oil storage tank through a first oil outlet pipe, the second oil outlet is connected with a second oil storage tank through a second oil outlet pipe, the first oil outlet pipe and the second oil outlet pipe are provided with control valves, and the first oil storage tank and the second oil storage tank are provided with exhaust holes.

Preferably, the height of the second oil outlet is higher than that of the first oil outlet.

Preferably, the bottom flange is fixed on the wellhead through bolts, and a triangular supporting plate is arranged at the joint of the bottom flange and the box body.

Preferably, one side of box is provided with the check valve, the box passes through the check valve is connected with the test tube, the inside of test tube is provided with the stopcock, the surface of test tube is provided with the scale, the hole of disappointing has been seted up at the top of test tube.

Preferably, the oil storage tank further comprises an anti-theft box, the anti-theft box is sleeved on the outer sides of the tank body and the oil storage tank, and an anti-theft door is arranged on the anti-theft box.

Compared with the prior art, the invention has the following technical effects:

1. through the cooperation of the telescopic rod and the spring, elastic movement is generated, buffering is performed, and the damage to the wellhead device is reduced;

2. two oil storage tanks are arranged, so that the oil storage capacity is enlarged, and the practicability is improved;

3. be provided with the alarm box, can effectively protect sealing device.

Drawings

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

FIG. 1 is a schematic structural view of a wellhead sealing device according to the present invention;

wherein, 1 is bottom flange, 2, box, 3, top cap, 4, first telescopic link, 5, second telescopic link, 6, spring, 7, first closing plate, 8, second closing plate, 9, first oil pipe, 10, second oil pipe, 11, backup pad.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example one

As shown in fig. 1, the embodiment provides a wellhead sealing device, which includes a hollow box 2, a bottom flange 1 and a top cover 3, where the bottom flange 1 is located at the bottom of the box 2 and used for being fixed at a wellhead, and a through hole is formed in the middle of the bottom flange 1 and used for being communicated with an oil pipe; the top cover 3 is positioned at the top of the box body 2, a first telescopic rod 4 is installed below the top cover 3, a first sealing plate 7 is arranged below the first telescopic rod 4, and a second sealing plate 8 is connected below the first sealing plate 7 through a second telescopic rod 5; an oil outlet is formed in the box body 2, and the oil outlet is connected with an oil storage tank through an oil outlet pipe.

In this embodiment, an elastic element is disposed below the second telescopic rod 5, the top of the elastic element is fixedly connected with the bottom of the second telescopic rod 5, and the bottom of the elastic element is fixedly connected with the top of the second sealing plate 8; in this embodiment, the elastic element is a spring 6, or other elastic mechanism as required.

In this embodiment, the second telescopic rod 5 and the elastic element are symmetrically provided with two sets, so as to improve the buffering capacity.

In this embodiment, through the cooperation of first telescopic link 4, first closing plate 7, second telescopic link 5, second closing plate 8 and spring 6, can realize multistage buffering, prevent that higher pressure from producing the damage to sealing device.

In this embodiment, the oil-out is provided with two, including first oil-out and second oil-out, first oil-out is connected with first batch oil tank through first oil pipe 9, the second oil-out is connected with the second batch oil tank through second oil pipe 10, first oil pipe 9 with be provided with the control valve on the second oil pipe 10, first batch oil tank with be provided with the exhaust hole on the second batch oil tank.

In this embodiment, the height of the second oil outlet is higher than the height of the first oil outlet.

In the embodiment, the bottom flange 1 is fixed on the wellhead through bolts, specifically, the bottom flange 1 is a circular flange, a plurality of bolt holes are uniformly distributed on the periphery of the circular flange, and the bottom flange is fixed by bolts penetrating through the bolt holes; bottom flange 1 with the junction of box 2 is provided with triangular backup pad 11, utilizes triangular backup pad 11's stability to consolidate bottom flange 1, can improve well head sealing device security, is favorable to the sealed of oil well head.

In this embodiment, one side of box 2 is provided with the check valve, box 2 passes through the check valve is connected with the test tube, the inside of test tube is provided with the stopcock, the surface of test tube is provided with the scale, the hole of disappointing has been seted up at the top of test tube.

In this embodiment, still including the theftproof case, the theftproof case cover is located the box 2 with the outside of batch oil tank, set up on the theftproof case and put the burglary-resisting door.

When the bottom flange type oil well is used, the bottom flange 1 is fixed on a well mouth, when the pressure of the well mouth is increased, the pressure in the box body 2 is increased simultaneously, the second sealing plate 8 pushes the second telescopic rod 5 to move upwards along with the elastic movement of the spring 6, and the first sealing plate 7 and the first telescopic rod 4 are further pushed to move upwards; when the second sealing plate 8 rises to a certain height, the electromagnetic valve on the first oil outlet pipe 9 is opened, and the petroleum stock solution and the high-pressure gas enter the first oil storage tank through the first oil outlet pipe 9 for storage; when the liquid level in the box body 2 rises again, the control valve on the second oil outlet pipe 10 is opened;

and 2 internal pressure of box increase in the time, through the rising of stopcock in the test tube, can detect the inside pressure value of box 2, open the check valve, the registration of stopcock can be looked over on the scale on the test tube, and the rethread is lost heart and can be discharged unnecessary gas.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. A wellhead sealing device, characterized in that: the bottom flange is positioned at the bottom of the box body and used for being fixed at a wellhead, and a through hole is formed in the middle of the bottom flange; the top cover is positioned at the top of the box body, a first telescopic rod is arranged below the top cover, a first sealing plate is arranged below the first telescopic rod, and a second sealing plate is connected below the first sealing plate through a second telescopic rod; the oil outlet is connected with an oil storage tank through an oil outlet pipe.

2. A wellhead sealing device according to claim 1, characterised in that: an elastic element is arranged below the second telescopic rod, the top of the elastic element is fixedly connected with the bottom of the second telescopic rod, and the bottom of the elastic element is fixedly connected with the top of the second sealing plate.

3. A wellhead sealing device according to claim 2, characterised in that: the elastic element is a spring.

4. A wellhead sealing device according to claim 3, characterised in that: the second telescopic rod and the elastic element are symmetrically provided with two groups.

5. A wellhead sealing device according to claim 1, characterised in that: the oil-out is provided with two, including first oil-out and second oil-out, first oil-out is connected with first batch oil tank through first oil pipe, the second oil-out is connected with the second batch oil tank through the second oil pipe, first oil pipe with be provided with the control valve on the second oil pipe, first batch oil tank with be provided with the exhaust hole on the second batch oil tank.

6. A wellhead sealing device according to claim 5, characterised in that: the height of the second oil outlet is higher than that of the first oil outlet.

7. A wellhead sealing device according to claim 1, characterised in that: the bottom flange is fixed on the wellhead through bolts, and a triangular supporting plate is arranged at the joint of the bottom flange and the box body.

8. A wellhead sealing device according to claim 1, characterised in that: one side of box is provided with the check valve, the box passes through the check valve is connected with the test tube, the inside of test tube is provided with the stopcock, the surface of test tube is provided with the scale, the hole of disappointing has been seted up at the top of test tube.

9. A wellhead sealing device according to claim 1, characterised in that: the anti-theft box is sleeved on the outer sides of the box body and the oil storage tank, and an anti-theft door is arranged on the anti-theft box.