CN213573991U

CN213573991U - Device for plugging oil and gas well mouth

Info

Publication number: CN213573991U
Application number: CN202022742019.7U
Authority: CN
Inventors: 王映东; 贺景阳; 陈普兵
Original assignee: Xinjiang Jinshi Drilling And Production Equipment Co ltd
Current assignee: Xinjiang Jinshi Drilling And Production Equipment Co ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-06-29
Anticipated expiration: 2030-11-27

Abstract

The utility model relates to a device is used in shutoff of oil gas well head. The technical scheme includes that the air storage device comprises a plug pipe, a flange, a sealed air storage seat, a plugging air bag, a one-way valve, a sealing ring, an exhaust pipe, a pressure valve and a communicating pipe. The utility model discloses a tertiary sealed protection, it is sealed first through the inseparable cooperation of grafting pipe and well and utilizing the sealing washer to form first one earlier, can enter into the air channel through the check valve and enter the shutoff gasbag when gas is sealed through first one, thereby make the shutoff gasbag aerify and compress tightly on the well wall and form the second and seal, and sealed gas storage seat is sealed buried in the soil around the well head, it is sealed to form the third, can effectively avoid well gas outgoing, thereby can open the second pressure valve under the pressure action if leakage quantity is too big and enter into sealed gas storage seat, discharge from blast pipe department after the buffer memory, the blast pipe can lead to gas safety emission district or collect, thereby avoid gas to cause danger to well head department staff.

Description

Device for plugging oil and gas well mouth

Technical Field

The utility model belongs to the technical field of oil and gas equipment, a device is used in shutoff of oil gas well head is related to.

Background

The development of oil gas well is mainly to exploit oil and natural gas, through installing pipeline in the oil gas well that bores, transports the oil gas resource of underground, and because the gap can appear in the contact position of well head equipment and well in the development process, make the natural gas or the toxic gas that exist in the bottom run out from the well head along the gap, produce huge potential safety hazard to staff and production platform, consequently, the shutoff of oil gas well head is sealed all very important. In the current oil and gas well mouth plugging operation process, combustible gas and toxic and harmful gas which are blown out from a stratum are diffused in a plugging operation environment, welding operation is often carried out in the plugging operation, and a welding spot is not isolated from the stratum gas, so that the safety of plugging construction operation and constructors is seriously influenced.

SUMMERY OF THE UTILITY MODEL

In view of the problems in the prior art, the utility model discloses a device for plugging the wellhead of an oil and gas well, which adopts the technical proposal that the device comprises an inserting pipe, wherein the circumferential wall of the inserting pipe is internally provided with an air vent groove, the outer side wall of the inserting pipe is provided with an air inlet at the lower position, the air inlet is communicated with the air vent groove, the middle part of the outer side wall of the inserting pipe is evenly provided with an annular groove at equal intervals, a one-way valve is arranged in the air inlet, a plugging air bag is fixedly connected in the annular groove and is communicated with the air vent groove, the upper end of the inserting pipe is fixedly connected with a flange, a sealing air storage seat is fixedly connected on the inserting pipe below the flange, a sealing ring is fixedly connected below the air inlet at the lower part of the circumferential wall of the inserting pipe, and the sealing air storage seat is communicated with, the second pressure valve is installed on the communicating pipe, the upper portion of the sealed gas storage seat is communicated and connected with the exhaust pipe, and the first pressure valve is installed on the exhaust pipe.

As a preferred scheme of the utility model, sealed gas storage seat has seted up the gas storage chamber for annular and its inside, the gas storage chamber pass through communicating pipe with the air channel intercommunication.

As a preferred scheme of the utility model, the shutoff gasbag is annular and its inboard fixedly connected with intake pipe, intake pipe fixed connection is in peg graft and manage and make the inner chamber of shutoff gasbag with the air channel intercommunication.

As a preferred scheme of the utility model, first pressure valve opening pressure value is greater than the opening pressure value of second pressure valve.

As a preferable aspect of the present invention, the ventilation direction of the check valve is led to the ventilation groove from the outside of the insertion pipe.

The utility model has the advantages that: the utility model discloses a tertiary sealed protection, it is sealed first through the inseparable cooperation of grafting pipe and well and utilizing the sealing washer to form first one earlier, can enter into the air channel through the check valve and enter the shutoff gasbag when gas is sealed through first one, thereby make the shutoff gasbag aerify and compress tightly on the well wall and form the second and seal, and sealed gas storage seat is sealed buried in the soil around the well head, it is sealed to form the third, can effectively avoid well gas outgoing, thereby can open the second pressure valve under the pressure action if leakage quantity is too big and enter into sealed gas storage seat, discharge from blast pipe department after the buffer memory, the blast pipe can lead to gas safety emission district or collect, thereby avoid gas to cause danger to well head department staff.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a sectional view of the internal structure of the present invention;

fig. 3 is a schematic structural view of the plugging airbag of the present invention.

In the figure: 1-plug pipe, 101-air inlet, 102-annular groove, 103-vent groove, 2-flange, 3-sealed air storage seat, 301-air storage cavity, 4-blocking air bag, 401-air inlet pipe, 5-one-way valve, 6-sealing ring, 7-air outlet pipe, 8-first pressure valve, 9-communicating pipe and 10-second pressure valve.

Detailed Description

Example 1

As shown in fig. 1 to 3, the technical scheme adopted by the device for plugging the wellhead of the oil and gas well of the present invention is that the device comprises an insertion pipe 1, wherein an air groove 103 is formed in the circumferential wall of the insertion pipe 1, an air inlet 101 is formed in the lower position of the outer wall of the insertion pipe 1, the air inlet 101 is communicated with the air groove 103, annular grooves 102 are uniformly formed in the middle of the outer wall of the insertion pipe 1 at equal intervals, one-way valves 5 are installed in the air inlet 101, plugging air bags 4 are fixedly connected in the annular grooves 102, the plugging air bags 4 are communicated with the air groove 103, a flange 2 is fixedly connected to the upper end of the insertion pipe 1, a sealed air storage seat 3 is fixedly connected to the insertion pipe 1 below the flange 2, a sealing ring 6 is fixedly connected to the lower part of the circumferential wall of the insertion pipe 1 below the air inlet 101, the sealed air storage seat 3 is communicated with the air groove 103 through a communicating pipe, and a second pressure valve 10 is installed on the communicating pipe 9, the upper part of the sealed gas storage seat 3 is communicated and connected with a gas exhaust pipe 7, and a first pressure valve 8 is installed on the gas exhaust pipe 7.

The sealed gas storage seat 3 is annular and is internally provided with a gas storage cavity 301, and the gas storage cavity 301 is communicated with the vent groove 103 through a communicating pipe 9.

The plugging air bag 4 is annular and is fixedly connected with an air inlet pipe 401 on the inner side, and the air inlet pipe 401 is fixedly connected to the inserting pipe 1 and enables an inner cavity of the plugging air bag 4 to be communicated with the vent groove 103.

The opening pressure value of the first pressure valve 8 is greater than the opening pressure value of the second pressure valve 10.

The ventilation direction of the one-way valve 5 is from the outside of the insertion tube 1 to the ventilation groove 103.

The utility model discloses a theory of operation: the inserting pipe 1 is closely inserted into a well, certain sealing performance can be achieved, the lower half portion of the sealed gas storage seat 3 is buried in soil around the well head and is sealed and reinforced by concrete, so that the sealed gas storage seat 3 covers the well head in a sealing mode, gas leaked from the well head cannot be discharged from the periphery of the sealed gas storage seat 3, well head equipment can be installed on the flange 2, gas in the well head can be firstly blocked by the sealing ring 6, gas is prevented from leaking from a gap between the inserting pipe 1 and the well head, if the sealing performance of the sealing ring 6 is reduced to form leakage, the gas can enter the vent groove 103 through the check valve 5, then enters each blocking air bag 4 through the vent groove 103 to expand the blocking air bags 4, so that the blocking air bags 4 are in close contact with the wall of the well head to prevent the gas from leaking from the gap and all enter the vent groove 103, when the leakage amount is too large, the pressure in the vent groove 103 is increased, the second pressure valve 10 can be opened, so that gas enters the gas storage cavity 301 from the communicating pipe 9, the gas storage cavity 301 has a certain buffer function, the pressure is further increased due to the fact that the storage amount in the gas storage cavity 301 is too large, the first pressure valve 8 can be opened, gas is discharged from the exhaust pipe 7, the gas outlet of the exhaust pipe 7 can be extended to a safe area far away from a well head or connected with an upper storage device, and therefore the leaked gas can be safely discharged, and danger to personnel near the well head is avoided.

Components not described in detail herein are prior art.

Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge range of those skilled in the art, and modifications or variations without creative efforts are still within the scope of the present invention.

Claims

1. The utility model provides a device for plugging of oil gas well wellhead, which is characterized in that, includes grafting pipe (1), vent groove (103) have been seted up to the circumference wall inside of grafting pipe (1), air inlet (101) have been seted up to the lateral wall of grafting pipe (1) by the lower position, air inlet (101) with vent groove (103) intercommunication, annular groove (102) have evenly been seted up at equidistant between the lateral wall middle part of grafting pipe (1), install check valve (5) in air inlet (101), fixedly connected with shutoff gasbag (4) in annular groove (102), shutoff gasbag (4) with vent groove (103) intercommunication, grafting pipe (1) upper end fixedly connected with flange (2), flange (2) below is in fixedly connected with sealed gas storage seat (3) on grafting pipe (1), grafting pipe (1) circumference wall lower part is in air inlet (101) below fixedly connected with sealing washer (6), sealed gas storage seat (3) with communicate through communicating pipe (9) between air channel (103), install second pressure valve (10) on communicating pipe (9), sealed gas storage seat (3) upper portion intercommunication is connected with blast pipe (7), install first pressure valve (8) on blast pipe (7).

2. The device of claim 1 for plugging an oil and gas well head, wherein: the sealed gas storage seat (3) is annular and is internally provided with a gas storage cavity (301), and the gas storage cavity (301) is communicated with the vent groove (103) through the communicating pipe (9).

3. The device of claim 1 for plugging an oil and gas well head, wherein: the blocking air bag (4) is annular, an air inlet pipe (401) is fixedly connected to the inner side of the blocking air bag, and the air inlet pipe (401) is fixedly connected to the inserting pipe (1) and enables the inner cavity of the blocking air bag (4) to be communicated with the vent groove (103).

4. The device of claim 1 for plugging an oil and gas well head, wherein: the opening pressure value of the first pressure valve (8) is larger than that of the second pressure valve (10).

5. The device of claim 1 for plugging an oil and gas well head, wherein: the ventilation direction of the one-way valve (5) is from the outer side of the insertion pipe (1) to the ventilation groove (103).