1. Mechanical and Electrical Engineering College,China University of Petroleum,Qingdao　 266580,China; 2. China United Coalbed Methane Co. ,Ltd. , Beijing　 100011,China

致力于开发煤系气的合采技术是国内现有非常规能源发展的重点。通过对煤系气的地质特征及合采煤系气的产出机理进行分析,采用正确的生产工艺及合理的井下管柱是实现煤系气合采作业的前提条件。通过对双管柱合采技术进行分析,针对上部为煤层,下部为高压产气层的煤系气合采环境,设计出了较为适用的煤系气合采工艺。构造出双管柱合采煤系气结构,并建立了管柱尺寸的选取模型,再通过分析计算管柱是否满足连续生产作业来判定所涉及的双管柱合采技术对于煤系气合采作业的可适用性。分析得出:双管柱合采技术可用于煤系气的合采作业,并依据地质条件,给出了不同尺寸井口条件下煤层最大产水与高压产层最大产气量的关系,对今后更深入的煤系气合采技术研究提供了一定的参考。

The development of coal-gas mixing technology is the focus of the existing non-conventional energy develop-ment. Through the analysis of the geological characteristics of coal gas and the mechanism of coal production,the cor-rect production technology and reasonable down-hole string are the prerequisites for realizing the coal gas gathering op-eration. In this paper,through the analysis of the double-pipe mixing technology,a suitable coal-gas blending process is designed for the coal-gas blending environment of the upper part of the coal seam and the lower part of the high-pres-sure gas-producing layer. The double-column coal mining system is constructed,and the selection model of the size of the column is established. Then,it is determined whether the pipe string satisfies the continuous production operation to determine the double-applicability of the operation. The results show that the dual-tube column mining technology can be used for the coal-gas gathering and production operation. Based on the geological conditions,the relationship between the maximum water production and the maximum gas production in the coal seam under different wellhead conditions is given. In-depth coal gas gathering technology provides a certain reference.

国家油气科技重大专项资助项目(2016ZX05066004-002,2017ZX05042003-001)；中央高校基本科研业务费专项资金资助项目(16CX02004A)；

ZHANG Fenna,ZHANG Hao,QI Yaoguang,et al. Adaptability analysis on co-exploitation based on dual-tube technology in coal-bearing gas[J]. Journal of China Coal Society,2017,42(10):2657-2661.