近井地应力场及其对渗透率的伤害

STRESS AROUND WELLBORE AND IT’S DAMAGE TO FIELD’S PERMEABILITY

范学平 吴宏

Fan Xueping Wu Hong

中石化新星公司上海海洋石油局, 上海 200120

Shanghai Offshore Petroleum Bureau of CNSPC

近井油藏流体压力和有效地应力变化较大,导致油藏岩石结构和渗流能力发生动态变化,进而影响生产。为研究这一变化,在试验研究岩心渗透率随地应力变化的基础上,耦合流体渗流场和地应力场,采用迭代方法得到了近井应力场和渗流场解,并分析了井壁附近油藏岩石弹塑性变形、地应力分布以及对储层渗流能力的伤害情况。

With production, fluid pressure and effective stress will be changed greatly, especially around wellbore. Then it will induce the change of link structure and damage the permeability, so the productivity of the well will be influenced. Based on the experimental research about the relation between permeability and effective stress, the numerical solution is been developed with the method of coupled fluid-solid, and of iterative calculation. It is shown by the example that this method can be used to analyze stress and permeability damage around wellbore.

10.3969/j.issn.1000-7393.2001.04.015