Preset carbon dioxide fire extinguishing device for underground operation of oil and gas well

Abstract

The utility model discloses a preset carbon dioxide fire extinguishing device for underground operation of an oil and gas well, which comprises a carbon dioxide gas storage tank 1, a gas outlet pipeline of the carbon dioxide gas storage tank 1 is connected with a fire extinguishing gas transmission pipeline 2, and one end of the fire extinguishing gas transmission pipeline 2 and the other end of the fire extinguishing gas transmission pipeline 2 are connected with a wellhead fire extinguishing unit 3. By adopting the preset carbon dioxide fire extinguishing device for underground operation of the oil and gas well, fire extinguishing can be implemented by remotely opening the tank-following airtight valve on the carbon dioxide gas storage tank when a fire disaster occurs at a wellhead, and the operation is safe, simple and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of practical oil and gas well fire extinguishing equipment, and specifically to a pre-installed carbon dioxide fire extinguishing device for underground operations in oil and gas wells. Background Art

[0002] The underground operation of high-gas oil and gas wells is extremely risky, and the formation pressure is high. Once gas invades the well, it will have a great impact on the pressure inside the well, which can easily cause a blowout and fire accident. Emergency disposal and emergency rescue of fire accidents are particularly critical. At present, the main measures commonly taken to extinguish fires in oil and gas wells and natural gas wells are still to use well site firefighting equipment and facilities to extinguish fires, or to seek help from the fire brigade to organize firefighting. It is difficult to ensure that the fire is effectively extinguished as soon as it occurs, which can easily lead to further spread and expansion of the fire. Utility Model Content

[0003] The utility model aims to provide a pre-installed carbon dioxide fire extinguishing device for underground operation of oil and gas wells, which solves the problem of low efficiency of manual fire extinguishing in the prior art.

[0004] The technical solution adopted by the utility model is: a carbon dioxide fire extinguishing device is pre-installed for underground operation of oil and gas wells, including a carbon dioxide gas storage tank, a gas outlet pipeline of the carbon dioxide gas storage tank is connected to a fire extinguishing gas pipeline, and the other end of the fire extinguishing gas pipeline is connected to a wellhead fire extinguishing unit;

[0005] The fire-extinguishing gas pipeline includes a three-way pipe, one end of which is connected to the gas outlet pipe of the carbon dioxide gas storage tank through a quick-release joint, and the other two ends of the three-way pipe are respectively connected to straight-through pipes through quick-release joints, and the other end of each straight-through pipe is respectively connected to two Z-shaped pipes through quick-release joints;

[0006] An airtight valve is provided on the gas outlet pipe of the carbon dioxide gas storage tank;

[0007] The wellhead fire extinguishing unit includes two semi-annular storage tanks, which are connected by a clamp, and the air inlet of each semi-annular storage tank is connected to the other end of the Z-shaped pipe;

[0008] One side of the semi-annular storage tank forms an acute angle with the axis of the semi-annular storage tank, and a plurality of evenly distributed threaded holes are opened on the side of the semi-annular storage tank, and a gas fire extinguishing sprinkler is connected to each threaded hole through a thread;

[0009] Each gas fire extinguishing sprinkler includes a threaded interface, a limiting step is provided at the other end of the threaded interface, a columnar sprinkler is provided at the other end of the limiting step, a plurality of nozzles are evenly distributed around the side of the columnar sprinkler, a frustum-shaped sprinkler is provided at the other end of the columnar sprinkler, and a plurality of nozzles are evenly distributed around the conical surface of the frustum-shaped sprinkler.

[0010] The beneficial effects of the utility model are:

[0011] When conducting underground operations on high-gas oil and natural gas wells, the wellhead is surrounded by a wellhead fire extinguishing unit, limiting the scope of the initial fire. Once a fire occurs at the wellhead, the fire can be extinguished remotely by opening the airtight valve on the carbon dioxide storage tank. The operation is safe, simple and convenient.

[0012] Use mobile carbon dioxide gas storage tanks to store carbon dioxide fire extinguishing agents. The amount of fire extinguishing agent is sufficient. The fire extinguishing nozzles pre-installed in the wellhead fire extinguishing device spray out the fire in multiple angles. The carbon dioxide gas can quickly replace the remaining oxygen in the wellhead space, continuously forming an inert gas isolation protective cover to suppress the continuation of the fire;

[0013] According to the site and safety distance requirements, the straight pipes of different lengths can be replaced to facilitate use in different working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the overall structure of a pre-installed carbon dioxide fire extinguishing device for underground oil and gas well operations according to the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the wellhead fire extinguishing unit of the utility model;

[0016] Figure 3 The utility model is a schematic diagram of the structure of a gas fire extinguishing sprinkler.

[0017] In the figure: 1-carbon dioxide gas storage tank, 2-fire extinguishing gas pipeline, 201-three-way pipeline, 202-straight pipeline, 203-Z-shaped pipeline, 3-wellhead fire extinguishing unit, 301-semi-annular storage tank, 4-airtight valve, 5-gas fire extinguishing fire sprinkler, 501-threaded interface, 502-limiting step, 503-columnar sprinkler, 504-cone-shaped sprinkler, 6-oil and gas wellhead. DETAILED DESCRIPTION

[0018] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0019] like Figure 1 As shown, the utility model provides a pre-installed carbon dioxide fire extinguishing device for underground operations in oil and gas wells, including a carbon dioxide storage tank 1, the gas outlet pipe of the carbon dioxide storage tank 1 is connected to a fire extinguishing gas pipeline 2, and the other end of the fire extinguishing gas pipeline 2 is connected to a wellhead fire extinguishing unit 3. The carbon dioxide storage tank 1 is not limited to being filled with only carbon dioxide gas, and other inert gases for fire extinguishing are also applicable.

[0020] The fire-extinguishing gas pipeline 2 includes a three-way pipe 201, one end of the three-way pipe 201 is connected to the outlet pipe of the carbon dioxide storage tank 1 through a quick-release joint, and the other two ends of the three-way pipe 201 are respectively connected to the straight pipe 202 through quick-release joints, and the other end of each straight pipe 202 is respectively connected to two Z-shaped pipes 203 through quick-release joints. The diameter of the three-way pipe 201 is larger than the diameter of the straight pipe 202, and the sum of the diameters of the two straight pipes 202 is not less than the diameter of the three-way pipe 201 to ensure stable output of gas from the delivery pipeline.

[0021] An airtight valve 4 is provided on the gas outlet pipe of the carbon dioxide storage tank 1 .

[0022] The wellhead fire extinguishing unit 3 includes two semi-annular storage tanks 301 , which are connected by a clamp, and the air inlet of each semi-annular storage tank 301 is connected to the other end of the Z-shaped pipe 203 .

[0023] like Figure 2 As shown, one side of the semi-annular storage tank 301 forms an acute angle with the axis of the semi-annular storage tank 301, and a plurality of evenly distributed threaded holes are opened on the side of the semi-annular storage tank 301, and a gas fire extinguishing fire sprinkler 5 is threadedly connected to each threaded hole. Carbon dioxide gas is sprayed out through the gas fire extinguishing fire sprinkler 5, and an inert gas isolation protective cover is instantly formed in the wellhead space area to achieve asphyxiation fire extinguishing.

[0024] like Figure 3 As shown, each gas fire extinguishing sprinkler 5 includes a threaded interface 501, a limiting step 502 is provided at the other end of the threaded interface, a columnar sprinkler 503 is provided at the other end of the limiting step 502, a plurality of nozzles are evenly distributed around the side of the columnar sprinkler 503, a frustum-shaped sprinkler 504 is provided at the other end of the columnar sprinkler, and a plurality of nozzles are evenly distributed around the conical surface of the frustum-shaped sprinkler.

[0025] The utility model provides a pre-installed carbon dioxide fire extinguishing device for underground operations in oil and gas wells, and its working principle is: before implementing underground operations, the placement positions of the carbon dioxide gas storage tank 1 and the wellhead fire extinguishing unit 3 are first determined according to the wellhead position and the actual well site, the fire extinguishing gas pipeline 2 is pre-installed and buried in a pit, and the carbon dioxide gas storage tank 1, the fire extinguishing gas pipeline 2, and the wellhead fire extinguishing unit 3 are connected in sequence through quick-release joints. When a fire breaks out at the wellhead during underground operations, the airtight valve 4 on the carbon dioxide storage tank 1 is quickly opened to control the discharge of the gas in the tank. The carbon dioxide gas is transported to the wellhead fire extinguishing unit 3 through the fire extinguishing gas pipeline 2 in turn, and the carbon dioxide gas is sprayed out through the gas fire extinguishing fire nozzle 5 to put out the fire. A mobile carbon dioxide storage tank 1 is used at the operation site to store the carbon dioxide fire extinguishing agent. The amount of fire extinguishing agent is sufficient, and the carbon dioxide gas can be controlled to be transported over long distances by opening the airtight valve 4. The operation is safer and more reliable. The wellhead fire extinguishing unit 3 arranged around the wellhead is used to further limit the spread of the wellhead fire. The gas fire extinguishing fire nozzle 5 with multiple spray angles is used to spray the carbon dioxide gas, and an oxygen-isolating and flame-suppressing environment is formed instantly and continuously at the wellhead, thereby achieving asphyxiation fire extinguishing at the wellhead.

[0026] Example 1

[0027] like Figure 1 As shown, the pre-installed carbon dioxide fire extinguishing device for underground operations in oil and gas wells proposed in this embodiment includes a carbon dioxide gas storage tank 1, the gas outlet pipe of the carbon dioxide gas storage tank 1 is connected to a fire extinguishing gas pipeline 2, and the other end of the fire extinguishing gas pipeline 2 is connected to a wellhead fire extinguishing unit 3.

[0028] Example 2

[0029] like Figure 1 As shown, it includes a carbon dioxide gas storage tank 1, the gas outlet pipe of the carbon dioxide gas storage tank 1 is connected to a fire extinguishing gas pipeline 2, and the other end of the fire extinguishing gas pipeline 2 is connected to a wellhead fire extinguishing unit 3. The fire extinguishing gas pipeline 2 includes a three-way pipe 201, one end of the three-way pipe 201 is connected to the gas outlet pipe of the carbon dioxide gas storage tank 1 through a quick release joint, and the other two ends of the three-way pipe 201 are respectively connected to straight-through pipes 202 through quick release joints, and the other end of each straight-through pipe 202 is respectively connected to two Z-shaped pipes 203 through quick release joints. An airtight valve 4 is provided on the gas outlet pipe of the carbon dioxide gas storage tank 1.

[0030] Example 3

[0031] like Figure 1 and Figure 2As shown, the pre-installed carbon dioxide fire extinguishing device for underground operation of oil and gas wells proposed in this embodiment includes a carbon dioxide storage tank 1, the gas outlet pipeline of the carbon dioxide storage tank 1 is connected to a fire extinguishing gas pipeline 2, and the other end of the fire extinguishing gas pipeline 2 is connected to a wellhead fire extinguishing unit 3. The fire extinguishing gas pipeline 2 includes a three-way pipeline 201, one end of the three-way pipeline 201 is connected to the gas outlet pipeline of the carbon dioxide storage tank 1 through a quick release joint, and the other two ends of the three-way pipeline 201 are respectively connected to a straight-through pipeline 202 through a quick release joint, and the other end of each straight-through pipeline 202 is respectively connected to two Z-shaped pipelines 203 through a quick release joint. An airtight valve 4 is provided on the gas outlet pipeline of the carbon dioxide storage tank 1. The wellhead fire extinguishing unit 3 includes two semi-annular storage tanks 301, the two semi-annular storage tanks 301 are connected by a clamp, and the air inlet of each semi-annular storage tank 301 is connected to the other end of the Z-shaped pipeline 203. One side of the semi-annular storage tank 301 forms an acute angle with the axis of the semi-annular storage tank 301 . The side of the semi-annular storage tank 301 is provided with a plurality of evenly distributed threaded holes, and a gas fire extinguishing sprinkler 5 is threadedly connected to each threaded hole.

[0032] Example 4

[0033] like Figure 1-3 As shown, the pre-installed carbon dioxide fire extinguishing device for underground operation of oil and gas wells proposed in this embodiment includes a carbon dioxide storage tank 1, the gas outlet pipeline of the carbon dioxide storage tank 1 is connected to a fire extinguishing gas pipeline 2, and the other end of the fire extinguishing gas pipeline 2 is connected to a wellhead fire extinguishing unit 3. The fire extinguishing gas pipeline 2 includes a three-way pipeline 201, one end of the three-way pipeline 201 is connected to the gas outlet pipeline of the carbon dioxide storage tank 1 through a quick release joint, and the other two ends of the three-way pipeline 201 are respectively connected to a straight-through pipeline 202 through a quick release joint, and the other end of each straight-through pipeline 202 is respectively connected to two Z-shaped pipelines 203 through a quick release joint. An airtight valve 4 is provided on the gas outlet pipeline of the carbon dioxide storage tank 1. The wellhead fire extinguishing unit 3 includes two semi-annular storage tanks 301, the two semi-annular storage tanks 301 are connected by a clamp, and the air inlet of each semi-annular storage tank 301 is connected to the other end of the Z-shaped pipeline 203. One side of the semi-circular storage tank 301 forms an acute angle with the axis of the semi-circular storage tank 301. The side of the semi-circular storage tank 301 is provided with a number of evenly distributed threaded holes, and a gas fire-fighting sprinkler 5 is threadedly connected to each threaded hole. Each gas fire-fighting sprinkler 5 includes a threaded interface 501, a limiting step 502 is provided at the other end of the threaded interface, a columnar sprinkler 503 is provided at the other end of the limiting step 502, a number of nozzles are evenly distributed around the side of the columnar sprinkler 503, a frustum-shaped sprinkler 504 is provided at the other end of the columnar sprinkler, and a number of nozzles are evenly distributed around the conical surface of the frustum-shaped sprinkler.

Claims

1. Pre-installed carbon dioxide fire extinguishing device for underground operation of oil and gas wells, characterized by: It comprises a carbon dioxide gas storage tank (1), the gas outlet pipe of the carbon dioxide gas storage tank (1) is connected to a fire extinguishing gas pipeline (2), and the other end of the fire extinguishing gas pipeline (2) is connected to a wellhead fire extinguishing unit (3); The fire-extinguishing gas pipeline (2) comprises a three-way pipe (201), one end of the three-way pipe (201) is connected to the gas outlet pipe of the carbon dioxide gas storage tank (1) via a quick-release joint, the other two ends of the three-way pipe (201) are respectively connected to straight-through pipes (202) via quick-release joints, and the other end of each straight-through pipe (202) is respectively connected to two Z-shaped pipes (203) via quick-release joints; An airtight valve (4) is provided on the gas outlet pipe of the carbon dioxide gas storage tank (1); The wellhead fire extinguishing unit (3) comprises two semi-annular storage tanks (301), the two semi-annular storage tanks (301) are connected by a clamp, and the air inlet of each semi-annular storage tank (301) is connected to the other end of the Z-shaped pipe (203); One side surface of the semi-annular storage tank (301) forms an acute angle with the axis of the semi-annular storage tank (301), and a plurality of evenly distributed threaded holes are provided on the side surface of the semi-annular storage tank (301), and a gas fire extinguishing nozzle (5) is threadedly connected to each of the threaded holes; Each of the gas fire extinguishing nozzles (5) comprises a threaded interface (501), the other end of the threaded interface is provided with a limiting step (502), the other end of the limiting step (502) is provided with a columnar nozzle (503), a plurality of nozzles are evenly distributed around the side of the columnar nozzle (503), the other end of the columnar nozzle is provided with a frustum-shaped nozzle (504), and a plurality of nozzles are evenly distributed around the conical surface of the frustum-shaped nozzle.

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