稠油自乳化水驱开发规律

Study on Water Flooding With Self⁃Emulsification in Heavy Oil Reservoirs

受原油性质的影响,稠油自乳化水驱开发与常规水驱开发不同,传统的稀油水驱理论不适用于稠油水驱开发。以中国某稠油自乳化水驱油藏流体参数为基础,通过室内实验和数值模拟,研究自乳化水驱开发规律,揭示自乳化水驱机理和主要影响因素。采用新的数值模拟方法揭示自乳化水驱的稳定驱替阶段为类“活塞式”驱油模式,开发全过程可分为4个阶段,即纯油阶段、过渡阶段、平台阶段和水油比快速上升阶段。渗透率级差和原油黏度是影响自乳化水驱含水率的主要因素,其次是渗透率和注水速度。

Influenced by crude oil properties,water flooding with self-emulsification in heavy oil reservoirs is different from conventional water flooding,and the conventional theories for light oil water flooding are not applicable to heavy oil reservoirs.Taking a heavy oil reser-voir with self-emulsification water flooding and the reservoir fluid parameters in China as cases,the water flooding with heavy oil self-emul-sification was studied through laboratory experiments and numerical simulations to clarify key mechanisms and main influencing factors.The new numerical simulation method reveals that the stable displacement stage of the self-emulsification water flooding is a quasi-piston oil displacement pattern.The development process can be divided into four stages,namely pure oil,transition,plateau and rapid WOR in-crease.Permeability ratio and crude oil viscosity are the main factors affecting the water cut in self-emulsification water flooding,followed by permeability and water injection rate.