一种应力敏感油气藏流固耦合的简化模拟方法

A SIMPLIFIED METHOD OF FLUID-SOLID COUPLING SIMULATION TO STRESS-SENSITIVE RESERVOIR

数值模拟中通常采用流固耦合的方式来模拟应力敏感现象。但是,流固耦合需要大量的数据以及计算时间。利用多孔介质弹性理论和双重有效应力理论,得到地层压力与地层平均应力的关系,并把实验室测量数据转换到地层条件下,并将这种关系应用到数值模拟中。结果表明,渗透率的变化并不明显;考虑渗透率随压力变化时的稳产时间和累计产量均比未考虑时有降低,其降低幅度比较小;提出的简化模拟方法与流固耦合模拟结果差别不大。

Fluid-solid coupling is used to consider the stress-sensitivity in simulation,but it needs a lot data and computing time as the progress of simulation will be impacted.Introducing the poroelasticity and double effective stress theory,the authors of this paper get the relationship of the fluid pressure and the permeability,and the laboratory data is transformed to the in-situ data.The relationship ia applicated in the simulation,the results show that the reduction of accumulative production and days of stable production resulting from stress-sensitivity is small; and the difference of simplified model and fluid-solid coupling model is small.