石油勘探与开发2017，Vol.44Issue(4)：615-621,7.DOI:10.11698/PED.2017.04.15
页岩储集层岩心水化作用实验
Experiments on shale reservoirs plugs hydration
摘要
Abstract
By using nuclear magnetic resonance (NMR) and CT scanning technologies,hydration experiments have been conducted on shale samples from the Lower Silurian Longmaxi Formation in Zhaotong area in North Yunnan and Guizhou Provinces under the confining pressure of 10 MPa to study the effect of hydration on the propagation of pores and natural fractures in shale formation.The results show that the hydration not only offsets the permeability drop caused by stress sensitivity,but makes the fracture network more complicated,the connection between fractures and pores better with larger volume,and permeability higher by facilitating the dilation,propagation and cross-connection of primary pores,natural fractures,and newly created micro-fissures;hydration damage mainly occurs along the bedding plane or the direction of primary fractures;samples with relatively-developed primary pores and fractures are most affected by hydration,samples with well-developed primary pores and natural fractures are less affected by hydration,samples with only pores are least affected by hydration;and the hydration intensity of shale plugs is affected by the development of primary pores and fractures,clay content and brittleness index jointly.Therefore,in shale reservoir stimulation,it is suggested that the pumping schedule,shut-in operation or clean-up with small choke during early flow-back process be considered according to the features of shale reservoir to enhance the complexity and connection of facture network and improve the stimulation effect.关键词
页岩储集层/增产改造/返排制度/水化作用/核磁共振/CT扫描/孔隙-裂缝结构Key words
shale reservoir/stimulation/flow-back process/hydration/NMR/CT scanning/pores and natural fractures分类
能源科技引用本文复制引用
钱斌,朱炬辉,杨海,梁兴,尹丛彬,石孝志,李德旗,李军龙,方卉..页岩储集层岩心水化作用实验[J].石油勘探与开发,2017,44(4):615-621,7.基金项目
中国石油天然气集团公司重大专项(2014F47-02) （2014F47-02）
中国石油集团川庆钻探工程有限公司项目(CQ2016B-28-1-4) （CQ2016B-28-1-4）
