韩城矿区煤层气井分层合采产能特征及分布模式  

Productivity characteristics and distribution modes of multi-layer drainage coalbed methane wells in Hancheng Mining Area

作　　者：赵俊龙[1,2] 汤达祯[1,2] 林文姬[3] 许浩[1,2] 刘彦飞[1,2] 王若仪 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]煤层气开发利用国家工程中心煤储层实验室,北京100083 [3]中联煤层气有限责任公司国家工程研究中心,北京100095 [4]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《煤炭科学技术》2015年第9期80-86,共7页Coal Science and Technology

基　　金：国家科技重大专项资助项目(2011ZX05038-001);国家自然科学基金资助项目(41272175);中央高校基本科研业务费专项基金资助项目(2652015331)

摘　　要：为全面评价和认识多层合采煤层气井的开发效果,基于韩城矿区不同层位组合方式下煤层气井产能特征,结合无因次产能阶段划分方法,建立了韩城矿区煤层气井开发组合产能分布模式。结果表明:韩城矿区煤层气井多表现为高产水、低产气特征,产能效果亟待提高。无因次产气率在气井排水阶段结束时约为0.3,不稳定产气阶段结束时约为0.6,气井稳定产气阶段结束时约为0.8;产气高峰出现在稳定产气阶段,产水高峰出现在不稳定产气阶段。多层合采较单层排采效果好,双层合采较三层合采效果好,其中含有3号煤层与5、11号煤层的合采井(3+5、3+11、3+5+11)合采效果比只含有5、11号煤层的合采井(5+11)及含砂层合采井效果好。建议增加含有3号煤层合采井的比例以提高气井产能,井位部署及压裂时应避开断层,尤其注意监测裂缝是否沟通含水层。In order to evaluate and understand coalbed methane （CBM） well development effect with multi-layer drainage comprehensive- ly, based on nmlti-layer drainage coalbed methane （CBM） well productivity characteristics in Hancheng Mining Area, the productivity dis- tribution modes under different coal seam combinations were also established with dimensionless production stage classification method. The resuhs indicated that most of the CBM wells were observed with high water rate and low gas rate which needs to be improved urgently. At the end of the water drainage stage, the dimensionless gas rate was about 0. 3 while it was about 0. 6 when the unstable gas production stage was over. Meanwhile, when end of stable gas production stage occurs, the value of dimensionless gas rate was about 0. 8. The gas rate peak appeared in stable gas production stage and water rate peak could be found in unstable gas production stage. The effect of the multi -layer drainage was better than that of the single layer and the two-layer drainage was better than that of the three-layer. When No. 3 coal was contained in production layers （No. 3 ＋ 5,3 ＋ 11,3 ＋ 5 ＋ 11 ） , the productivity of C BM well was higher than those of No. 5 ＋ 11 and sand layers. In the process of the subsequent CBM development,it was considerable to increase the proportion of the wells which produced gas from the No. 3 coal to improve well productivity. In addition, when well was placed and fractured, it was also important to avoid faults, es- pecially paid more attention to monitor whether the coal seams were communicated with aquifers by cracks.

关 键 词：分层合采 产能 分布模式 韩城矿区 煤层气 煤储层 

分 类 号：P618.11[天文地球—矿床学]