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Drilling optimization method for extracting coal seam gas by drilling

An optimization method, coal seam gas technology, applied in the direction of gas discharge, earthwork drilling, design optimization/simulation, etc., can solve problems such as increased construction costs, lack of theoretical basis for drilling parameter design, and substandard drainage

Inactive Publication Date: 2022-04-22
XIAN UNIV OF SCI & TECH
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Problems solved by technology

In the existing drainage technology, the judgment index of borehole parameters is mainly the effective drainage radius, which can be used to determine the borehole spacing. However, there is currently no clear judgment method for drainage process parameters such as drainage negative pressure and borehole diameter. The selection of its parameters mostly depends on the field drainage experience, resulting in a lack of theoretical basis for the design of drilling parameters, which may easily lead to problems such as excessive drilling, increased construction costs, and substandard drainage, making it impossible to achieve precise coal seam gas drainage

Method used

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  • Drilling optimization method for extracting coal seam gas by drilling
  • Drilling optimization method for extracting coal seam gas by drilling
  • Drilling optimization method for extracting coal seam gas by drilling

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Embodiment Construction

[0069] Such as figure 1 A drilling optimization method for drilling coal seam gas extraction is shown, the method includes the following steps:

[0070] Step 1. Acquisition of geological parameters of the coal seam to be studied:

[0071] Step 101. Obtain the regional geological parameters of the coal seam to be studied through exploration; wherein, the regional geological parameters of the coal seam to be studied include coal body density ρ c , elastic modulus E, shear modulus G, Poisson's ratio v, effective stress coefficient β, coal body temperature T, coal body initial porosity Coal bulk modulus K s , gas molar mass M, Langmuir volume adsorption constant a, Langmuir pressure adsorption constant b, gas dynamic viscosity coefficient u, gas diffusion coefficient D, gas desorption diffusion coefficient τ, gas density ρ in the standard state ga , molar gas constant R 1 ;

[0072] Step 102, obtaining the vertical stress F of the coal seam to be studied;

[0073] Step 103,...

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Abstract

The invention discloses a drilling optimization method for extracting coal seam gas by drilling. The drilling optimization method comprises the following steps: 1, acquiring geological parameters of a coal seam to be researched; 2, constructing a gas extraction mathematical model considering the dynamic evolution of the coal permeability; 3, acquiring a drilling parameter design scheme; 4, constructing a coal-rock mass model, and obtaining a regression model of the maximum gas pressure between the drill holes and the standard pressure ratio; 5, optimizing the drilling parameters and acquiring a contour map of the drilling parameters; and 6, on-site drilling extraction of the coal seam to be researched. The method is simple in step and reasonable in design, the drilling parameters are optimized based on the ratio of the maximum gas pressure between the drill holes to the standard pressure, the extraction negative pressure, the drill hole diameter and the drill hole interval are optimized, it is guaranteed that coal seam gas extraction reaches the standard on the premise that the gas extraction effect is improved and the construction cost is reduced, coal seam gas extraction is accurate, and the coal seam gas extraction efficiency is improved. And a theoretical basis and technical guidance are provided for on-site extraction drilling hole arrangement.

Description

technical field [0001] The invention belongs to the technical field of coal seam gas drainage, and in particular relates to a drilling optimization method for coal seam gas drainage by drilling. Background technique [0002] The gas content in most mining areas in my country is relatively high, and the pressure of gas disaster prevention and control is high, which restricts the safe production of mines. Drilling coal seam gas extraction technology is the fundamental measure to reduce gas content, prevent gas accidents, and realize safe coal mining. Among them, the technology of drilling coal seam gas drainage has achieved remarkable results in mine gas control. In view of the regional characteristics of coal seam gas occurrence, the key is to accurately determine the drilling layout parameters to achieve the standard of coal seam gas drainage, which is of great significance to the prevention and control of mine gas disasters. [0003] When drilling is used to extract coal ...

Claims

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Application Information

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IPC IPC(8): G06F30/20E21B47/00E21B47/06E21B47/07E21F7/00G06F111/10G06F119/14
CPCG06F30/20E21B47/00E21B47/06E21B47/07E21F7/00G06F2111/10G06F2119/14
Inventor 林海飞季鹏飞孔祥国李树刚魏宗勇龙航白杨李莉双海清肖鹏赵鹏翔丁洋
Owner XIAN UNIV OF SCI & TECH
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