油水两相平面径向渗流压差时量理论研究

doi:10.11885/j.issn.1674-5086.2020.07.09.01

摘要/Abstract

摘要： 平面径向渗流过程中井底与油层外边界之间存在压差，为了研究压差随时间不断变化的情况下油水两相渗流，开展了压差时量概念的完善及其函数关系研究。利用径向流基本渗流理论推导压差时量的函数关系式，使用数值模拟方法和公式计算方法对具体算例进行计算对比。研究工作取得了较为理想结果，完善后的压差时量概念适用于平面径向渗流，分油水井两种情况，得到了压差时量与累计产液量或累计注水量之间的函数关系式，算例的数值模拟结果和公式计算结果相互符合。研究表明，根据油水井情况的不同，压差时量是累计产液量或累计注水量的函数；影响压差时量的因素有相对渗透率曲线、油黏度、水黏度、渗透率、单位厚度油层累计产液量或累计注水量、未打井外边界内单位厚度圆盘状油层的孔隙体积、单位厚度井筒半径内可容纳圆形多孔介质的孔隙体积。

关键词: 平面径向流, 压差时量, 变压力, 渗流, 油水两相

Abstract: There is a pressure difference between the bottom hole and the outer boundary of the reservoir in the process of planar radial fluid flow. In view of the problem that the oil-water two phase fluid flow under the condition of changing pressure difference, the concept of pressure-difference-time is improved and the functional relationship is studied. The research method is to use the basic fluid flow theories to derive the function relationship of pressure-difference-time. The numerical simulation method and formula calculation method are used to calculate and compare the specific examples. The results of the study are satisfactory. The improved concept of pressure-difference-time is suitable for planar radial fluid flow. The function relationship between pressure-difference-time and cumulative liquid production or cumulative water injection is obtained. The numerical simulation results of the specific example are consistent with those of the formula. The following conclusions are obtained in this paper: pressure-difference-time is a function of cumulative liquid production or cumulative water injection. The factors influencing pressure-difference-time include relative permeability curve, oil viscosity, water viscosity, permeability, cumulative liquid production or water injection per unit thickness, pore volume per unit thickness of disk-shaped reservoir in outer boundary, pore volume per unit thickness of the disk-shaped porous media in the wellbore radius.

Key words: planar radial fluid flow, pressure-difference-time, variable pressure, seepage, oil-water two phase

中图分类号:

TE312

刘海龙. 油水两相平面径向渗流压差时量理论研究[J]. 西南石油大学学报(自然科学版), 2022, 44(5): 85-97.

LIU Hailong. The Theory of Pressure-difference-time of Planar Radial Fluid Flow of Oil-water Two Phase Fluid[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(5): 85-97.

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