摘要
低渗储层已成为当前最具研究价值的课题,由于低渗储层对应力变化十分敏感,所以对低渗储层应力敏感性研究对成功开采这类储层具有深远意义。应力变化的响应在页岩储层中尤为明显,可以明显观测到岩石渗透率随有效应力的增加而降低,呈非线性关系。实验利用应力敏感实验装置,测定其在不同围压下的渗透率,实验表明,渗透率随围压增大下降幅度先急剧增大而后趋于平缓,围压减小后渗透率未能完全恢复,裂缝发生非弹性形变。对于页岩储层来说,开采过程中应该注意储层应力场的变化,尽量降低其对储层渗透率及储层产能的影响程度。
Low permeable reservoir has already become a task with most research value. Because low permeable reservoir is extremely sensitive to variation of stresses, it has far-reaching significance to study stress sensitivity of low permeable reservoir on successful exploitation of this reservoir. Response to variation of stress is extremely obvious in shale reservoir.It can be clearly observed that shale permeability will be reduced with the increase of effective stress and present non-linear relationship. By using experimental facility of stress sensitivity,measures permeability under different confining pressures. The experiment shows that with the increase of confining pressures, permeability is firstly dramatically and then tends to be gentle gradually. After reducing confining pressures, permeability can＇t recover completely. Fissure appears non-elastic deformation. For shale reservoir, it should pay attention to variation of reservoir stress and try to reduce its influences on reservoir permeability andreservoir production capacity.
作者
谢雅西
蔡立峰
吴颖惠
罗然
刘建军
XIE Yaxi CAI Lifeng WU Yinghui LUO Ran LIU Jianjun(Energy Institute of Chengdu University of Technology, Chengdu Sichuan 610059, China Gas Production Plant 3 of PetroChina Changqing Oilfield Company, X i＇an Shanxi 710021, China Gas Production Plant 4 of PetroChina Changqing Oil field Company ,Xi＇an Shanxi 710021, China)
出处
《石油化工应用》
CAS
2016年第10期29-32,共4页
Petrochemical Industry Application
关键词
金页1井
页岩储层
实验评价
应力敏感指数
Jinye 1st well
shale reservoir
experimental evaluation
stress sensitivity index
