镇28区长3油藏微观水驱油及影响因素研究

Microscopic Water Flooding Characteristics and Its Influence Factors of Chang-3 Reservoir in Zhen-28 Area

本文应用真实砂岩微观模型水驱油渗流试验,结合常规物性、铸体薄片、高压压汞等测试资料,研究了镇28区长3储层微观水驱油特征及驱油效率的影响因素,为油田有效开发提供了科学依据。研究结果表明:长3储层微观渗流路径为指状驱替和网状驱替两种,在同一试验条件下指状驱替的驱油效率明显小于网状驱替;残余油类型主要为油膜、角隅、卡断、绕流残余油;储层物性是影响驱油效率的主要因素,在水驱压力不变的情况下,随着水驱倍数的增加,驱油效率明显提高,但大于某一临界值时,增加幅度减小。因此在水驱油藏开发过程中应注重将生产动态资料和岩心水驱油渗流试验相结合,设计具有针对性的开发工艺来提高驱油效率。

This paper has studied water flooding characteristics and its influence factors of Chang-3 reservoir in Zhen- 28 area by microscopic water flooding seepage experiment with conventional physical properties and high-pressure mercury injection, provided scientific basis for effective development of oilfield. The results showed that the micro- scopic seepage paths of Chang-3 reservoir include finger displacement and mesh displacement, and displacement effi- ciency of the finger displacement is less than that of mesh displacement under the same experimental conditions~ the main types of residual oil flow around the grain or be stuck ,and oil slick or caecum residual oil. Reservoir property is the main factor affecting oil displacement efficiency, under the condition of constant water flooding pressure, the oil displacement efficiency increases with the increase of water flooding times, but more than a critical value, the increase amplitude decreases. Therefore, we should pay attention to combine the production dynamic data and core water flooding seepage experiment, in the development process of water flooding reservoir, design a targeted devel- opment process to improve oil displacement efficiency.