Device for simulating coal-seam hydraulic fracturing effect to monitor discharged excavated pulverized coal change and experimental method thereof

Abstract

A device for simulating a coal-seam hydraulic fracturing effect to monitor discharged excavated pulverized coal change comprises a hydraulic fracturing confining-pressure power system, a gas injection system, a hydraulic fracturing testing system and a computer. The gas outlet end of the gas injection system is connected with the gas inlet end of the hydraulic fracturing testing system. The computer is connected with the hydraulic fracturing confining-pressure power system, the gas injection system and the hydraulic fracturing testing system respectively through data lines. The invention further discloses an experimental method of the device for simulating the coal-seam hydraulic fracturing effect to monitor the discharged excavated pulverized coal change. The device is reasonable in design, a prepad fluid, a sand-carrying fluid and a displacement fluid are sequentially injected into a hydraulic fracturing pipe through the hydraulic fracturing confining-pressure power system, high-pressure gas is injected into an annular clamp and the injection amount of the high-pressure gas is regulated through the gas injection system and a confining-pressure device, and coal-seam hydraulic fracturing under the conditions of different coal-seam attribute parameters, different formation stress parameters and different particle sizes and the pulverized coal discharge amount produced under a hydraulic fracturing simulation effect are monitored by controlling the computer to be connected with the hydraulic fracturing confining-pressure power system, the gas injection system, the confining-pressure device, the monitoring device, the annular clamp and the hydraulic fracturing pipe.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a monitoring device and an experimental method thereof for simulating coal seam fracturing action to discharge and mine changes in coal powder. Background technique [0002] In order to develop my country's rich coalbed methane resources, Chinese coalbed methane workers have gradually formed "favorable blocks" after more than 30 years of basic theoretical research and exploration and development practices of coalbed methane on the basis of the successful experience of coalbed methane development in the United States and other countries. Under the guidance of the basic idea of ​​coalbed methane exploration and development-optimization-drilling-fracturing-drainage and gas recovery, the annual production of ground coalbed methane in my country has increased from 100 million m3 in 2006 3 increased to 4.425 billion m in 2015 3 , the annual production of coalbed me...

AI Technical Summary

Problems solved by technology

However, coalbed methane wells need to undergo reservoir reconstruction before drainage, and the mechanical properties of coal samples after reconstruction are quite different from those in the original state. This test method leads to a large deviation from the actual situation, and cannot really effectively guide on-site drainage.

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