摘要
页岩气中吸附气占比达20%～85%,吸附气的解吸直接影响页岩气渗流规律,进而影响页岩气井的生产规律。为了研究解吸对页岩气流动规律的影响,设计了相应的渗流实验并对实验结果进行了详细的分析。研究认为:解吸会减缓孔隙压力的下降、延缓压力波的传播;吸附气的存在会明显增加页岩的总含气量;页岩气解吸时随着压力的下降会出现2个快速的解吸阶段,此时解吸量会明显增大;页岩气井日产量曲线的跳跃性台阶是由页岩气解吸引起。
Adsorbed gas makes up about 20% to 85% of total gas content in shale,the desorption of the adsorbed gas will affect the behaviour of porous flow and production for shale gas.Therefore,in the present study,experiment was carried out to investigate the effect of desorption on the flow of shale gas.The experiment data for several angle was analyzed,the results shows that:desorption can retard the pressure dropping in the pore,thus retard pressure propagation in the stratum;adsorption apparently increase the gas content of shale;along with the decreasing of the pressure,two stages with desorption faster than the other stages appears,at the time the amount of desorption also increase greatly;production curve has two jumping stages for desorption during the producing process.
作者
左罗
仲冠宇
王海涛
张政道
吴魏
ZUO Luo;ZHONG Guanyu;WANG Haitao;ZHANG Zhengdao;WU Wei(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 100029,China;SINOPEC Research Institute of Petroleum Engineering,Beijing 100029,China;Chongqing Fuling Shale Gas Exploration and Development Company,SINOPEC,Chongqing 408014,China)
出处
《中国科技论文》
CAS
北大核心
2018年第23期2679-2682,共4页
China Sciencepaper
基金
国家自然科学基金资助项目(51490653)
国家科技重大专项(2015ZX05069)
中国石化页岩油气富集机理与有效开发国家重点实验室专项基金资助项目(KL17031)
关键词
页岩
吸附
解吸
流动
渗流
shale
adsorption
desorption
flow
porous flow
