CN-224200630-U - Blowout preventer for gas extraction drilling

CN224200630UCN 224200630 UCN224200630 UCN 224200630UCN-224200630-U

Abstract

The utility model relates to the technical field of underground coal mine drilling construction, in particular to a gas extraction drilling blowout preventer, which mainly solves the technical problem that gas at the tail of a drill rod overflows after water is removed in the prior art. The device comprises a water supply assembly, a drainage assembly and a negative pressure assembly, wherein the water supply assembly comprises a pump truck, a water supply pipe and a water supply valve, the drainage assembly comprises a drain pipe, a drain valve, a buffer water tank and a return pipe, and the negative pressure assembly comprises a drainage pipe, a drainage valve, a drainage device and a gas drainage device. When water is needed to be dismantled, the extraction valve and the drain valve are opened, the water supply valve is closed, if the hole blocking phenomenon exists in the drill hole, the gas-water mixture can enter the water drainage device through the extraction pipe under the action of pressure difference, gas and the like are drained into the gas extraction device under the action of negative pressure of the gas extraction device, so that gas overflow can be avoided, and meanwhile, the drain pipe, the buffer water tank and the return pipe form a water circulation system, and the pump blocking phenomenon can be effectively avoided.

Inventors

WANG WENMING
GUO JUNBIN
WANG LONGFEI
ZHANG YUEZHENG
LI TAO
LIANG QIAN

Assignees

晋能控股装备制造集团有限公司

Dates

Publication Date: 20260505
Application Date: 20250528

Claims (2)

1. The utility model provides a gas drainage drilling blowout preventer which characterized in that includes: The water supply assembly comprises a pump truck (1), a water supply pipe (2) and a water supply valve (3), wherein the rear end of the water supply pipe (2) is communicated with the pump truck (1) and the front end of the water supply pipe is used for communicating water feces, and the water supply valve (3) is arranged in the middle of the water supply pipe (2); The drainage assembly comprises a drainage pipe (4), a drainage valve (5), a buffer water tank (6) and a return pipe (7), wherein one end of the drainage pipe (4) is communicated with a pipe section of a water supply pipe (2) positioned at the rear side of the water supply valve (3) and the other end of the drainage pipe is communicated with the buffer water tank (6), the drainage valve (5) is arranged in the drainage pipe (4), and one end of the return pipe (7) is communicated with the buffer water tank (6) and the other end of the return pipe is communicated with the pump truck (1); The negative pressure assembly comprises a drainage pipe (8), a drainage valve (9), a water drainage device (10) and a gas drainage device, one end of the drainage pipe (8) is communicated with a pipe section of a water supply pipe (2) positioned at the front side of the water supply valve (3) and the other end of the drainage pipe is communicated with the water drainage device (10), the drainage valve (9) is installed in the drainage pipe (8), and the gas drainage device is communicated with the top of the water drainage device (10).
2. The gas extraction drilling blowout preventer according to claim 1, wherein the gas extractor comprises a negative pressure main pipe (11) and a negative pressure branch pipe (12), the negative pressure main pipe (11) is used for communicating a negative pressure source to form a negative pressure environment, one end of the negative pressure branch pipe (12) is communicated with the negative pressure main pipe (11) and the other end is communicated with the top of the water drainer (10).

Description

Blowout preventer for gas extraction drilling Technical Field The utility model relates to the technical field of underground coal mine drilling construction, in particular to a blowout preventer for a gas extraction drilling. Background The gas prevention and control in the gas extraction drilling construction process is an important point of mine safety prevention and control and is also a difficult point, and gas overrun accidents caused by insufficient precautionary measures are not enumerated. In the drilling construction process, the main reasons of gas overflow are that the coal side has cracks, the sealing measures of the orifice are not in place, and the tail of the drill rod is conducted to the outside to cause pressure relief after water is removed. The method is characterized in that the method is used for solving the problem of gas overflow of coal side cracks, shallow hole grouting or coal wall guniting and other measures are adopted at present, and the method is used for solving the problem of gas overflow of an orifice, and a blowout preventer with a negative pressure system and a sealing leather gasket is arranged at the orifice to play a role in drainage and also can prevent the gas overflow to a certain extent. However, the problem that gas at the tail of the drill rod overflows after water is removed is full of uncertainty, if the hole is smooth in the drilling construction process, the continuous drainage of the orifice negative pressure system leads to no aggregation condition in the hole, no gas is flushed after water is removed, if soft coal, hole collapse and hole blocking conditions occur in the construction process, the phenomenon of unsmooth slag return in the hole, small slag discharge quantity in the orifice and even hole blocking occur, after water is removed, a large amount of gas, water and slag mixture can be instantaneously discharged by taking the tail of the drill rod as the only pressure relief port, and overflowed gas can not be treated in the operation space through the drainage system, so that gas accidents are extremely easy to cause. Therefore, the gas at the tail of the drill rod after the water is removed has great uncertainty, which is the difficulty and the key point of gas prevention and control during the drilling construction, and the effective treatment measures still lack at present. Disclosure of utility model The utility model provides a blowout preventer for gas extraction drilling, which aims to overcome the technical defect that the problem of gas overflow at the tail of a drill rod after water is removed cannot be effectively treated in the prior art. The utility model provides a blowout preventer for gas extraction drilling, which comprises the following components: The water supply assembly comprises a pump truck, a water supply pipe and a water supply valve, wherein the rear end of the water supply pipe is communicated with the pump truck, the front end of the water supply pipe is used for communicating water feces, and the water supply valve is arranged in the middle of the water supply pipe; The drainage assembly comprises a drainage pipe, a drainage valve, a buffer water tank and a return pipe, one end of the drainage pipe is communicated with a water supply pipe section positioned at the rear side of the water supply valve, the other end of the drainage pipe is communicated with the buffer water tank, the drainage valve is arranged in the drainage pipe, and one end of the return pipe is communicated with the buffer water tank, and the other end of the return pipe is communicated with the pump truck; The negative pressure assembly comprises a drainage pipe, a drainage valve, a water drainage device and a gas drainage device, wherein one end of the drainage pipe is communicated with a water supply pipe section positioned at the front side of the water supply valve, the other end of the drainage pipe is communicated with the water drainage device, the drainage valve is installed in the drainage pipe, and the gas drainage device is communicated with the top of the water drainage device. Optionally, the gas extractor includes negative pressure house steward and negative pressure branch pipe, the negative pressure house steward is used for communicating the negative pressure source and forms the negative pressure environment, the one end and the negative pressure house steward intercommunication of negative pressure branch pipe and the other end communicate in the top of drain. Compared with the prior art, the technical scheme provided by the utility model has the following advantages: The utility model provides a blowout preventer for gas extraction drilling, which is characterized in that two branches are arranged on a water supply pipe, one branch is used for arranging a negative pressure component, and the other branch is used for arranging a drainage component. On the one hand, when the drilling is performed normally, the water supply valve is