变应力条件下低渗透储层近井地带渗流模型

FLOWING MODEL ON VARIED STRESS NEARBY WELL IN LOW PERMEABILITY RESERVOIR

秦积舜 张新红

Qin Jishun Zhang Xinhong

石油大学, 山东东营 257061

University of Petroleum, East China

通过室内试验研究,探索了变应力条件下岩石发生弹性、弹塑性变形时,其孔隙度、渗透率、压缩系数与应力的关系,得到岩石在发生弹性、弹塑性形变时的渗透率、岩心孔隙度 (压缩系数)-应力状态方程;以此为基础,建立了低渗透储层近井地带的一维两相径向渗流模型,并利用常规三维两相微分方程数学模型为径向流模型提供边界条件,对二者进行结合和转化形成计算机模型。利用该模型,可计算、分析变应力条件下低渗透储层近井地带油水渗流的一般规律,定量研究低渗透储层发生弹性变形和弹塑性变形对单井流入动态的影响情况。因此,这种方法在低渗透油田开发中具有一定的理论意义和应用价值。

An experimental study was carried out to determine the relations among rock permeability, porosity (compression coefficient) and effective stress, and to drive a state equation. The station equation can be used in setting up single well one dimensional two phase radial flow model whose boundary value problem can be worked out by a three dimensional two phase numerical model. By the flow principle in nearby well of low-permeability stratum under varied stress conditions can be further studied, and IPR curves of single well can also be plotted. It was also discussed that the radial flow model was used in interpreting oil field production data. Therefore, studying reservoir sensibility by experimental approach and computer models in doing with oil field production data were practicable and reasonable.

10.3969/j.issn.1000-7393.2001.05.013