No.113 Team, Guizhou Provincial Coalfield Geological Bureau

为了提高贵州省煤层气试井质量,对贵州省已有的煤层气试井工程的过程及测试结果资料进行了相关对比分析,系统研究了煤层气试井质量的影响因素。结果表明:设备注入能力、人工操作水平、封隔器坐封效果对试井质量有较大的影响;设备注入能力偏小、人工操作失误会使部分测试结果失真,单一封隔方式不能消除围岩的干扰,甚至造成测试失败。选用排量大且稳定的注入设备可实现恒定排量注入;采用分层隔离封隔器坐封以降低围岩对测试结果的影响;引入地面监控系统和流量自动记录设备以减少人为误差,实施以上措施可提高煤层气试井质量。

In order to improve the quality of well test, based on the available Guizhou Provincial measuring and test information of coalbed methane trial well, the r elated factors affected to the quality of coalbed methane trial well were discussed. The results showed that the quality of the trial well would be affected by the equipme nt injection ability and human operation, coal structure, surrounding rock, borehole stability and other factors. The equipment injection ability was small and human oper ation error could cause a serious distortion in the partial measured results and the present available roof sealing method could not eliminate the interferences of the sur rounding rock. In the next trial well operation, the injection equipment selection with large discharging value and higher stability was proposed to realize an injection wit h a constant discharging value. The separation and isolation packer was applied to the seating and sealing in order to reduce the surrounding rock properties affected t 0 the measured results. The surface monitoring and control system and the flow automatic recording equipment were introduced to reduce the human error and to ensur e the accuracy of the measured results.