常规底水油藏水锥高度计算方法研究

基于静力学原理和地下流体的运动规律方程,建立了底水油藏水锥体侧斜面为曲线情况下的水锥高度模型.该模型定量地描述了水锥高度与产量、油层厚度、井径向距离以及油层渗透率、原油黏度等因素之间的关系,根据该模型可求出最大水锥高度、不同径向距离处水锥高度、无水临界产量.同时建立了底水油藏水锥高度模型的求解方法:假定油相流动为平面径向流并不考虑油相非达西流动,可以求出模型的解析解;假定油相流动为球面向心流以及考虑油相非达西流动时,只能求出模型的数值解.同时结合矿场实例分析了水锥特征,为底水油藏开发提供了参考依据.

Calculation method for the water cone height of bottom-water reservoir

Based on static mechanism and kinetic equation of underground fluid, the model for calculating the height of the water cone with curvilinear side surface is established. This model quantitatively describes the relationship between the water cone height and oil yield, reservoir thickness, radial distance from well axis, reservoir permeability and crude oil viscosity. Maximum water cone height, the water cone heights at different radial distances and water-free critical oil yield can be obtained according to this model. In calculating the water cone height, the analytic solution of the model can be gained if oil phase is plane radial flow and the non-Darcy flow of oil phase is not considered; its numeral solution can only be obtained if oil phase is spherical centripetal flow and non-Darcy flow of oil phase is considered. Through a case, the characteristics of water cone are analyzed, which provides a reference for the development of bottom-water reservoir.