用气测渗透率法评价川东南龙马溪组页岩流体敏感性  

Using Gas Permeability to Evaluate Fluid Damage of Shales from Longmaxi Formation at Southeast Sichuan Basin

作　　者：李凯[1] 张浩[1] 邵孟璟 冉超 邵振滨 钟颖[2] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [2]成都理工大学能源学院,成都610059

出　　处：《科学技术与工程》2016年第6期168-171,177,共5页Science Technology and Engineering

基　　金：国家自然科学基金项目(51374044);教育部新教师基金联合资助项目(20105122120005)资助

摘　　要：孔喉致密、黏土矿物含量高使得川东南龙马溪组页岩气层具有严重的潜在流体敏感性损害特征。在目前的页岩液体敏感性评价中,研究人员还只是简单地沿用行业标准法,而没有形成系统地针对页岩液体敏感性的评价方法。提出气测渗透率法来评价页岩流体敏感性,并在川东南地区下志留统龙马溪组页岩储层应用,评价结果表明该区块水敏性强、盐敏性强、碱敏性强、酸敏性中等偏强,为合理开发该区块页岩气藏提供了理论基础。与常规方法相比,气测渗透率法不需计量岩心出口端流量,而是测量液体处理后的岩心烘干后的气体渗透率来评价损害程度,从而解决了因页岩液体渗透率极低而引起的测试时间长、实验误差大等问题。此外,气测渗透率法采用气体为实验介质,更符合气井生产实际。Dense pore throats and high content of clay minerals cause serious potential fluid sensitivity damage to shale gas reservoirs in Longmaxi formation at southeast Sichuan Basin. At present, the industrial standard method is usually used to evaluate fluid sensitivity of shales without emerging a systematic method for shales. A new way based on gas permeability to evaluate fluid damage of shales was put forward and was employed in evaluating fluid damage of shales from Longmaxi formation at southeast Sichuan Basin. Results indicate stong water damage, strong salt damage, strong lye damage and medium to strong acid damag gas reservoirs. In comparison with the industrial standard method, e, which lays reasonable suggestions to develop the fluid flow rate at the outlet of the core holder need not to be measured; instead, the gas permeability of the core dried after displaced by liquid is measured to evaluate fluid damage. Therefore, the gas permeability method shares shorter test time and smaller experimental error. What＇s more, gas is employed during gas permeability method, which conforms to reality in gas field.

关 键 词：页岩 气测渗透率法 敏感性 储层保护 

分 类 号：TE258.3[石油与天然气工程—油气井工程]