Research on calculating gas pressure with gas flow in crossing borehole
ZHOU Rui1，2，YAN Binyi2
(1. School of Resource and Civil Engineering，Northeastern University，Shenyang，Liaoning 110004，China； 2. CCTEG Shenyang Research Institute，Shenyang，Liaoning 110016，China)
Abstract：To improve the efficiency of testing gas pressure，the partial differential equation of gas radial flow in crossing borehole was established by using Law of conservation of mass and Darcys Law，then the gas pressure function was solved with Laplace Transform，thus the effectived emission radius and drainage radius were found；Considering the seepage flow manner of gas，the attenuation function and curve of gas flow in crossing borehole were obtained，so the method of calculating gas pressure and which represented the difficulty of gas emission in crossing borehole were proposed. Maximum error of gas pressure was 9% except gas pressure was under 0.28 MPa was showed by testing results in Gaoyuan coal mine. So without the need for accurately measuring gas pressure，calculation with gas flow could meet the needs of the coal mine with a factor of safety.
周 睿1，2，闫斌移2. 穿层钻孔径向流场瓦斯流量推算煤层瓦斯压力方法研究[J]. 岩石力学与工程学报, 2016, 35(S1): 3147-3152.
ZHOU Rui1，2，YAN Binyi2. Research on calculating gas pressure with gas flow in crossing borehole. , 2016, 35(S1): 3147-3152.
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2016, Vol. 35 
