摘要
煤层瓦斯直接测压法对测试地点和封孔质量要求严格,导致测压成功率较低、测试成本高且周期长,而间接测压法在实验操作、技术要求等方面存在一定不足,因此提出了一种基于“状态复原”原理的免封孔煤层瓦斯压力测定技术。依托免封孔煤层瓦斯压力测定仪,模拟煤体赋存条件分别设定了0.10、0.31、0.53、0.74、1.00、1.50 MPa共6个吸附平衡压力;通过压力卸载和常压解吸模拟井下取样过程,然后进行常压定量补气、煤心体积复原和储层条件温度模拟,使测压试样在与储层环境同等条件下恢复稳定;最终,6个压力恢复值分别为0.09、0.30、0.50、0.73、1.01、1.61 MPa;与对应的初始吸附平衡压力误差分别为-10.00%、-3.23%、-5.66%、-1.35%、1.00%、7.33%,总体误差范围在-10.00%~7.33%,验证了免封孔煤层瓦斯压力测定技术的可行性。
For the direct pressure measurement method,the strict requirements for the selection of test locations and the quality of the sealing lead to a lower success rate of pressure measurement,high test cost and long cycle;while the indirect pressure measurement method has certain deficiencies in experimental operation,technical requirements,etc.,a gas pressure measurement technology based on the principle of“state restoration”is proposed for non-sealing coal seams.Relying on the self-developed non-sealing coal seam gas pressure tester,six adsorption equilibrium pressures of 0.10 MPa,0.31 MPa,0.53 MPa,0.74 MPa,1.00 MPa and 1.50 MPa were set to simulate the occurrence conditions of coal.Through pressure unloading and atmospheric desorption to simulate the downhole sampling process,then carry out quantitative gas supplementation at atmospheric pressure,coal core volume restoration and temperature simulation of reservoir condition,so that the pressure test sample can be stabilized under the same conditions as the reservoir environment.Finally,the six pressure recovery values are 0.09 MPa,0.30 MPa,0.50 MPa,0.73 MPa,1.01 MPa and 1.61 MPa respectively;the errors of the corresponding initial adsorption equilibrium pressure are-10.00%,-3.23%,-5.66%,-1.35%,1.00%,7.33%.The overall error range is between-10.00%and 7.33%,which verifies the feasibility of the gas pressure measurement technology for the non-sealing coal seam.
作者
崔永杰
王兆丰
范道鹏
CUI Yongjie;WANG Zhaofeng;FAN Daopeng(School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;MOE Engineering Center of Mine Disaster Prevention and Rescue,Jiaozuo 454000,China)
出处
《煤矿安全》
CAS
北大核心
2021年第11期22-27,共6页
Safety in Coal Mines
关键词
瓦斯压力
直接法
间接法
免封孔法
可行性
gas pressure
direct method
indirect method
sealing-free method
reliability
