Bias gas-liquid two-phase jet-flow slotting permeability-increasing device and method

Abstract

A bias gas-liquid two-phase jet-flow slotting permeability-increasing device comprises a gas-liquid two-phase fluid generating system and a drilling and slotting integrated system, wherein the gas-liquid two-phase fluid generating system is composed of a high pressure water pump, a high pressure resistant hose, a pressure regulating valve, a check valve, a gas-liquid mixer, a pressure regulating valve, a high pressure air pump, a drilling rig, a drill pipe, a pressure control drill and a side nozzle. The side nozzle is used for spraying high-pressure bias gas-liquid two-phase jet flow to slot different sections of drilling walls. Two-beam gas-liquid two-phase jet flow acts on coal through impulses at a certain angle under the interaction of washout and cavitation erosion, 'water fight' in the slotting process is effectively avoided, the coal breakage threshold pressure is effectively reduced, the effective length of a slot in single slotting is enlarged, the coal disturbance range is increased obviously, the air permeability of the coal can be improved by about 250-400 times, and the gas extraction effect is improved substantially. Backflow gas can dilute the gushed gas density and operation safety is improved. The method is simple, the operation is easy, practicability is high, and time and labor are saved.

Description

technical field [0001] The invention relates to an offset gas-liquid two-phase jet slit slit antireflection device and method, which is especially suitable for pressure relief and antireflection in high gassy soft coal seams and for eliminating the risk of coal and gas outburst in coal seams. technical background [0002] Mine gas in the narrow sense of coal mines is methane, which mainly exists in a free state in the permeable space, and mainly exists in an adsorbed state in the micropores on the surface of the micropores and inside the coal particles occupying the cavities of the coal molecular structure or between coal molecules. space between. When the oxygen concentration in the air reaches 10% and the gas concentration is between 5% and 16%, an explosion will occur, directly threatening the lives of miners. The amount of methane released into the atmosphere from coal mining every year is astonishing. It is a greenhouse gas whose greenhouse effect in the atmosphere is ...

AI Technical Summary

Problems solved by technology

Continuous pure water jet requires high water pressure, high energy consumption, and large water consumption is likely to cause water accumulation, which is subject to certain restrictions in coal mine applications

Scholars at home and abroad have made a lot of beneficial attempts to change the jet structure to enhance the effect of pressure relief and anti-reflection, but due to the complexity of equipment and operation procedures, harsh conditions for jet formation, etc., it has not been popularized and applied in coal mine production.

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