多级水平井压裂注CO_2开采页岩气影响因素分析  

Influential factors analysis of shale gas exploitation by CO_2 injection of multi-stage horizontal well fracturing

作　　者：郭玉杰[1] 刘平礼[1] 郭肖[1] 贾春生[1] 杨新划 

机构地区：[1]西南石油大学油气藏地质与开发工程国家重点实验室,四川成都610500 [2]中国石油青海油田公司一号作业区,青海格尔木816000

出　　处：《油气藏评价与开发》2016年第2期64-68,共5页Petroleum Reservoir Evaluation and Development

基　　金：国家重点基础研究发展计划项目(973)"中国南方海相页岩气高效开发的基础研究"(2013CB228002)

摘　　要：水平井和多级压裂是开采页岩气等非常规油气资源的关键技术,根据微地震图,页岩中的水力压裂通常会产生非常复杂的裂缝网络,这就是所谓的"体积压裂"。为了更好地模拟页岩气在复杂孔隙中的流动情况,以煤层气模块(Eclipse2011)为主要平台,采用LS-LR-DR方法,通过改变主裂缝周围的导流能力来模拟SRV。在上述模型的基础上,研究了注CO_2开采页岩气的3个方案。结果表明,注CO_2能够提高页岩气的采收率,注入量和注入时机在CO_2注气开发中,存在最优值;同时,随着裂缝条数的增加,注CO_2开采页岩气的采收率效果越不明显。Horizontal well and multi-stage fracturing are key technologies of exploiting shale gas and other unconventional hydrocarbon resources. According to microseismogram, hydraulic fi＇acturing of shale often produces very complicated fracture network, namely volume fracturing. In order to better simulate flowing conditions of shale gas in complex pores, this paper took coalbed methane module Eclipse2011 as the main platform, adopted LS-LR-DR method, and simulated SRV through changing flow conductivi- ty. Based on above models, three programs of shale gas exploitation by CO2 were researched. The result shows that CO2 injection can improve shale gas recovery, and there occurs optimal values of injection rate and time, meanwhile, as the increase of fracture numbers, shale gas recovery is less obvious.

关 键 词：数值模拟 页岩气 多级裂缝 CO2 采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]