断层泥摩擦系数的影响因素INFLUENCING FACTORS ON THE FRICTION COEFFICIENT OF THE FAULT GOUGE
吕端川,吕延防,王岐,王万军
L Duanchuan,L Yanfang,WANG Qi,WANG Wanjun
摘要(Abstract):
在断层型油藏的注水开发过程中,过大的注水压力可能导致控圈断裂活化。为了保证生产安全,需要根据断裂的最大静摩擦力调整注水压力,而断层泥的摩擦系数是断裂活化条件下发生摩擦滑移时重要的物理参数。通过对岩石样品所夹断层泥的摩擦实验发现,在断层活化条件下断层泥的摩擦系数随正应力、断层泥含量及黏土成分、温度、含水量等的增加而降低。因此,在正应力大、泥质含量高、黏土成分富集、温度高、含水率高时控圈断裂的摩擦系数低,稳定性较差,断裂在注水压力变化时易滑动。
During the process of the waterflooding in the fault-type reservoir,the excessive water injection pressure may lead to the fracture activation that controls the trap.In order to ensure the operation and production safety,the water injection pressure must be adjusted according to the maximum static friction of the fracture,and the friction coefficient of the fault gouge is one of the important physical parameters in the process of the frictiorl and sliding of the activated fracture.Through the experiment of the fault clay/pug friction between the rock samples discovers that under the conditions of the above activation,the friction coefficient of the fault gouge drops with the increase of the normal stress,fault gouge content and composition,temperature and water content and so on.So in the places of higher normal stress,larger shale content and clay composition,higher temperature and water content,the friction coefficient of the faults that control the trap is lower,its stability is rather poorer,the fractures are prone to slip under the change of the water injection pressure.
关键词(KeyWords):
断裂;摩擦系数;影响因素;断层型油藏;注水开发
fault;friction coefficient;influencing factor;fault-type oil reservoir;waterflooding development
基金项目(Foundation): 国家自然科学基金项目(41372154);; 中国石油科技创新基金项目(2012D-5006-0110);; 东北石油大学校青年科学基金项目(2013NQ1270)
作者(Author):
吕端川,吕延防,王岐,王万军
L Duanchuan,L Yanfang,WANG Qi,WANG Wanjun
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