Design method of hole-drilling and hole-forming process scheme for drainage of outburst coal seam

Abstract

The invention relates to a design method of a hole-drilling and hole-forming process scheme for drainage of an outburst coal seam. The design method comprises the following steps: establishing a logical relationship between the change of geological conditions of the seam and the type of a needed optimal drilling rod; establishing a logical relationship between a drilling parameter of seam construction and a power parameter of a needed drilling machine; establishing a logical relationship among the geological conditions of the seam, a hole-drilling included angle, the water content of the seam and the needed slag-discharging power; establishing a logical relationship among the thickness of the beam, the air permeability coefficient of the beam, the diameter of drilling holes and the distribution scheme of the drilling holes; and according to the four logical relationships, establishing a database, programming software, and inputting corresponding geological conditions of the seam and the hole-drilling design parameters by a software platform of a computer to realize an automation design of the hole-drilling and hole-forming process scheme for drainage of the outburst coal seam. The design method has the advantages that engineering persons can be convenient to realize type selection of the drilling rod, type selection of the drilling machine, the slag-discharging power and the distribution design of the drilling holes of the seam according to the change of the geological conditions of the seam and the change of the hole-drilling parameter design, and the square ore is based on the scientific design scheme so as to be beneficial to realizing safe and high-efficiency drilling of the seam.

Description

technical field [0001] The invention relates to the professional field of gas control of gas-containing coal seams in the discipline of mining engineering, in particular to a method for designing a drilling process scheme for drainage of outburst coal seams, which is applicable to formulation of drainage drilling process schemes under various coal seam conditions. Background technique [0002] With the continuous increase of coal mining depth in my country, more and more low-gas mines will be transformed into high-outburst mines, and the proportion of high-gas and coal-to-gas outburst mines will gradually increase. Coal mining presents a "deep (high stress, high Gas, strong adsorption), high strength, and low permeability" are the three outstanding features. It is more difficult to form holes in coal seams. During the drilling process, the phenomenon of drill sticking, lost drill, and drill breakage is serious. Dynamic phenomena such as injection holes and coal guns occur freq...

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Problems solved by technology

[0003] One of the purposes of the present invention is to solve the problem of safe and efficient drilling of outburst coal seams, and provide a comprehensive research and analysis based on the influence of changes in coal seam geological conditions, drilling parameters and other factors on the drilling of high gas and easily outburst coal, Form a one-to-one logical relationship between changes in coal seam geological conditions, changes in drilling parameters, and design ideas for high gas and outburst coal technology schemes

[0004] A further object of the present invention is to solve the safety and high-efficiency drilling problems of outburst coal seams, and provide a method based on the above-mentioned research method to form four important logical relationships for solving the design of outburst coal seam extraction drilling technology schemes: coal seam geological conditions The logical relationship between the change and the required optimal drill pipe type; the logical relationship between the coal seam construction drilling parameters and the required drilling rig power parameters; logical relationship; the logical relationship between coal seam thickness, coal seam permeability coefficient, borehole diameter and borehole layout scheme

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