微裂缝岩心不同应力下的速敏效应

Speed sensitive effect on micro fracture rocks under different stress

针对裂缝性油藏储层岩石速敏效应,首先,根据对岩石微粒受力得出发生速敏现象的临界渗流速度公式.其次,得出在同一应力下,地层水和地层油引起速敏现象的临界流速不同;在不同应力下,同种实验流体引起速敏现象的临界流速不同.同时,通过实验曲线回归得出临界流速与岩石有效应力的定量关系式.最后,运用渗流力学原理,依据实验结论计算油井临界产量、注水井临界注入量,并配定生产井产量及注水井注水量,这对油田生产有一定指导意义.

Speed sensitive phenomenon of the critical flow rate will change with the rock effective stress when the fractured reservoir in the development process.Aiming at this issue,firstly,the critical flow velocity formula that cause velocity sensitive phenomenon was derived through the particle of rock force analysis.Based on the experimental data collection and analysis,the experimental result is that under the same confining pressure,the critical flow rates are different when experimental fluid are different.Under the different confining pressure,the critical flow rates are different when experiment fluid are same,The quantitative relation of the critical velocity and effective stress of rock was obtained by the experimental curves regression.Finally by applying the seepage flowing theory,we calculated the critical flow rate of well and all these provided relative evidence for determining production of wells.The results are of guiding significance for the oilfield.