致密砂岩储层渗吸数学模型及应用研究

发布时间：2018-08-21 19:55

【摘要】：针对致密砂岩储层渗吸效果评价的问题,基于饱和度方程、corey相渗曲线及J函数,建立了适用于致密砂岩储层压裂液-原油渗吸置换半解析模型,模型考虑了重力及毛管力作用,能够获取不同参数影响下的饱和度沿程分布及不同渗吸时间下的原油置换率,并利用建立的模型分析了相关参数敏感性,同时与长庆油田合水、定边2个区块致密砂岩岩心渗吸实验结果做了对比分析。研究结果表明:参数敏感性从大到小排序为润湿相系数、润湿相最大相渗值、油水黏度比、非润湿相系数、非润湿相最大相渗值;增加流体流动性、减小油水黏度比有助于提高岩心渗吸置换率;改变润湿相参数比改变非润湿相参数对渗吸作用影响更为显著;模型渗吸稳定置换率计算值与岩心实验计量值拟合率为85.7%,验证了模型具有较好的适用性。研究成果对压裂液-原油渗吸置换研究提供了一定的理论依据。
[Abstract]:Aiming at the problem of evaluating permeability effect of tight sandstone reservoir, based on saturation equation and J function, a semi-analytical model for fracturing fluid and oil permeability replacement in tight sandstone reservoir is established. Gravity and capillary force are taken into account in the model. Under the influence of different parameters, the saturation distribution along the path and the crude oil displacement rate under different permeation time can be obtained, and the sensitivity of related parameters is analyzed by using the established model, at the same time, it is combined with Changqing Oilfield. The experimental results of tight sandstone core permeability in two blocks of Dingbian are compared and analyzed. The results show that the order of parameter sensitivity from large to small is wetting phase coefficient, maximum phase permeability value of wetting phase, oil-water viscosity ratio, non-wetting phase coefficient, maximum permeation value of non-wetting phase, increasing fluidity of fluid, Decreasing the oil-water viscosity ratio is helpful to improve the permeability displacement rate of the core, and changing the wetting phase parameters is more significant than changing the non-wetting phase parameters. The fitting rate between the calculated value of the model and the measured value of the core experiment is 85.7, which verifies that the model has good applicability. The research results provide a certain theoretical basis for the study of fracturing fluid-crude oil permeability replacement.
【作者单位】：低渗透油气田勘探开发国家工程实验室;中国石油长庆油田分公司;西安石油大学;
【基金】：国家科技重大专项“鄂尔多斯盆地致密油开发示范工程”(2017ZX05069)、“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(2016ZX05050)
【分类号】：TE319

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