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为了提高煤层瓦斯压力测试工作的效率,基于质量守恒定律和达西定律,建立穿层钻孔径向流场瓦斯流动偏微分方程,采用拉普拉斯变换法解出瓦斯压力分布函数,得出瓦斯排放有效半径和抽放有效半径;再结合径向流场瓦斯的渗流方式,给出穿层钻孔瓦斯流量的衰减函数和衰减曲线,提出瓦斯流量推算瓦斯压力法及反映穿层钻孔瓦斯排放难易程度的指标?。通过高源煤矿现场试验的10个测试钻孔表明:在瓦斯压力不小于0.28 MPa的情况下,瓦斯流量推算瓦斯压力的误差在9%以内,因此在不需要精确测定瓦斯压力的工作中,只要选取一定的安全系数,流量推算法测得的瓦斯压力可以满足矿井生产需要。
In order to improve the efficiency of coal seam gas pressure testing, based on the law of conservation of mass and Darcy’s law, the partial differential equation of gas flow in radial flow field through the borehole was established, and the pressure distribution function was solved by Laplace transform. Gas emission effective radius and drainage effective radius; Combined with the seepage flow of radial flow field gas, the attenuation function and attenuation curve of gas flow in the borehole through borehole are given. Indicators of ease of emissions? The 10 test holes through the field test of Gaoyuan coal mine show that when the gas pressure is not less than 0.28 MPa, the error of the gas pressure estimated gas pressure is within 9%. Therefore, if it is not necessary to accurately measure the gas pressure, Select a certain safety factor, the gas pressure measured by the flow calculation method can meet the needs of mine production.