摘要
以煤层气井产能方程为基础,提出主力产层优选指数、主力产层扩展指数、产能贡献指数3项指标,建立产层组合优化"三步法"。主力产层优选,以耦合煤层厚度、煤层含气量、煤层渗透率、煤层储集层压力及煤体结构为主,评价产层潜能;主力产层扩展组合,在确保主力产层的充分缓慢解吸,且不暴露在液面之上前提下,以耦合临界解吸压力、层间距和储集层压力梯度差为主,综合评价主力、非主力产层间的相互干扰程度;产层组合优化,主要考虑组合产层的经济性,主力产层产能贡献指数大于30%,其他产层贡献指数大于10%,才能确保煤层气井投产后具有经济效益。经贵州松河开发试验井的开发效果对比分析,证实了产层组合优化"三步法"的科学性与实用性,可用于煤层气的多层合采方案设计。
Based on the productivity equation of coalbed methane(CBM)wells,three indexes,main production layer optimization index,main production layer expansion index and capacity contribution index are proposed,with which the three-step optimization method of production-layer combination is established.In selecting main production layer,the coal seam thickness,CBM content,coal seam permeability,coal seam reservoir pressure and coal structure are considered comprehensively to evaluate the potential of the production layer.In selecting expansion of the main production layer combination,on the premise of ensuring full and slow desorption of the main production layer and non-exposure of the main production layer out of liquid surface,the degree of mutual interference between the main and non-main production layers is comprehensively evaluated by coupling the critical desorption pressure,layer spacing and reservoir pressure gradient difference.In optimizing production layer combination,the main concern is the economic efficiency of the combined layers.Only when the contribution coefficient of the main production layer is greater than30%and the contribution index of the other production layers is more than10%,the economic benefit of a CBM well after being put into production can be ensured.Based on the comparative analysis of the development effect of the development test wells in Songhe of Guizhou province,it is proved that the'three-step method'for the optimization of production-layer combination is scientific and practical,and can be used to design the multi-layer commingling scheme of coalbed methane.
作者
杨兆彪
张争光
秦勇
吴丛丛
易同生
李洋阳
唐军
陈捷
YANG Zhaobiao;ZHANG Zhengguang;QIN Yong;WU Congcong;YI Tongsheng;LI Yangyang;TANG Jun;CHEN Jie(School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of CBM Resources and Dynamic Accumulation Process,Ministry of Education of China,Xuzhou 221008,China;Guizhou Research Center of Shale Gas and CBM Engineering Technology,Guiyang 550009,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2018年第2期297-304,共8页
Petroleum Exploration and Development
基金
国家科技重大专项"滇东黔西煤层气开发技术及先导性试验"(2016ZX05044-002)
国家自然科学基金项目(41772155)
中央高校基本科研业务费专项资金(2015XKZD07)
关键词
煤层气
多层合采
主力产层优选
组合优化
产能贡献中图
CBM
multi-layer commingled production
selection of main production layer
combination optimization
production contribution
