致密砂砾岩储层应力敏感性评价研究  

Evaluation study on the stress sensitivity of tight glutenite reservoir

作　　者：张景[1] 王颖[2] 范希彬[1] 户海胜 杨鑫 李闽[2] ZHANG Jing;WANG Ying;FAN Xibin;HU Haisheng;YANG Xin;LI Min(Research Institute of Exploration and Exploitation,Xinjiang Oilfield,Karamay,Xinjiang 834000,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering,SouthwestPetroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]新疆油田公司勘探开发研究院,新疆克拉玛依834000 [2]油气藏地质及开发工程国家重点实验室西南石油大学,四川成都610500

出　　处：《中国海上油气》2020年第3期105-110,共6页China Offshore Oil and Gas

基　　金：国家重点基础研究发展计划(973计划)项目“陆相致密油高效开发基础研究(编号:2015CB250900)”“十三五”国家科技重大专项“准噶尔盆地致密油开发示范工程(编号:2017ZX05070)”部分研究成果。

摘　　要：目前油田现场多采用常规应力敏感性或覆压渗透率实验方法来评价致密砂砾岩储层应力敏感性,所得结果与实际生产认识有很大偏差。选取4块岩心样品,采用非线性有效应力敏感实验,通过研究有效应力的变化来反映开采过程中各个阶段的围压与内压的变化规律,通过计算有效应力系数来反映致密砂砾岩储层中岩石孔隙形状、所充填砾石颗粒大小等物性因素的影响,并利用Jones模型对实验结果进行了评价,结果表明,4块岩样均存在中等应力敏感,与现场认识相符。分析认为,常规基质应力敏感实验过程相当于实验室应力敏感性实验的老化过程,因此建议采用非线性有效应力敏感实验及Jones评价方法来测量致密砂砾岩储层应力敏感性。At present,the stress sensitivity of tight glutenite reservoirs in oilfields is still evaluated by the conventional methods such as regular stress sensitivity experiments or overburden pressure permeability experiments,which give results that are largely deviated from actual production situation.In this study,4 cores were selected as samples,and nonlinear effective stress sensitivity experiment was conducted to reflect the change rules of confining pressures and inner pressures in each stage of production by studying the change in effective stress.The effective stress coefficient was then obtained to reflect the impacts of rock pore shapes,particle size of filling gravel and other physical factors on tight glutenite reservoirs.Jones model was used to evaluate the experimental results.The results show that all 4 cores have moderate stress sensitivity,which is consistent with the on-site situation,and analysis suggests that the process of conventional matrix stress sensitivity test is equivalent to the aging process of laboratory stress sensitivity experiment.Therefore,it is recommended to use nonlinear effective stress sensitivity experiment and Jones evaluation method to measure the stress sensitivity of tight glutenite reservoirs.

关 键 词：致密砂砾岩 非线性有效应力 渗透率 应力敏感系数 Jones评价方法 

分 类 号：TE243[石油与天然气工程—油气井工程]