A gas control system for a soft low-permeability coal seam well and a construction method thereof

By introducing quantitative models and decision-making logic, a gas control system was designed, which solved the problem of poor matching between surface equipment and underground borehole engineering parameters in soft, low-permeability coal seams. This system achieved scientific, precise, and optimized gas control, improved extraction efficiency and stability, and promoted safe and efficient coal mine production.

CN122383397APending Publication Date: 2026-07-14CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
Filing Date
2026-05-26
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing technologies lack a scientific and quantitative gas control system for fractured, soft, and low-permeability coal seams, resulting in poor matching between the capabilities of surface equipment and the parameters of underground drilling and fracturing processes. This leads to unstable control effects and makes it difficult to achieve full coverage and optimal economic benefits.

Method used

By introducing quantitative models and decision-making logic, and based on physical principles and critical engineering conditions, a gas control system is designed, including determining borehole location, casing diameter coordination, fracturing pump discharge calculation, surface pump group discharge, surface fracturing pump group discharge, surface pump group discharge, and hydraulic sandblasting perforation, to achieve precise matching between macroscopic and microscopic processes and formation conditions.

Benefits of technology

It has achieved a scientific, precise, and optimized gas management system, eliminated blind spots in gas extraction, improved the efficiency of single-hole extraction and the speed of regional management, reduced resource waste, and promoted safe and efficient coal mine production and coalbed methane resource development.

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Abstract

This invention belongs to the field of coal mine gas extraction technology, and relates to a gas control system and its construction method for wells in soft, low-permeability coal seams. The construction method includes the following steps: delineating the control area according to the mine excavation plan, and obtaining its dip length M along the roadway direction and working face strike length N, and planning the location of the surface well site; within the delineated control area, obtaining the average thickness H, gas content W, and Protodyakonov hardness coefficient f1 of the target coal seam, and analyzing the columnar profile of the rock strata; based on the columnar profile of the rock strata, selecting the borehole placement layer according to the roof priority principle, and determining the vertical distance D between the borehole and the coal seam. a Or D b The process includes: determining the diameter of boreholes and casings in a coordinated manner; calculating the discharge capacity of the surface fracturing pump group; determining the minimum concentration of abrasive for hydraulic sandblasting perforation; determining the borehole spacing S; and determining the length of the fracturing segment K. The process also includes: determining the directional long borehole layout for the treatment area, including calculating the number of boreholes P and the design length of a single borehole L.
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