不同水驱曲线水驱体积波及系数和可采储量的预测研究

水驱体积波及系数是注水油田开展动态分析、评价水驱效果的重要参数,尤其是它直接影响油田水驱的采收率值。尽管水驱体积波及系数的变化趋势,对油田开发决策的评价具有如此重大的参考价值,但对于水驱体积波及系数的变化规律,目前尚不能完全弄清楚。陈元千学者在前人研究基础上,经过推导提出了预测水驱体积波及系数与累积产油量,以及水驱体积波及系数与含水率的变化关系式1]。但是这种方法仅在丙型水驱曲线上获得较好的应用,究其主要原因在于极限可采储量的求取。笔者在这里避开这一问题,立足于原始的相渗资料和基本的高压物性数据,利用相关公式导出了不同水驱曲线水驱体积波及系数的变化规律,并进一步导出了水驱体积波及系数与地层压力的关系公式,对水驱体积波及系数评价与合理地层压力保持水平的选择有一定的参考意义。

The Research on Predicting Sweep Efficiency of Waterflood Volume and The Relationship with Fofmation Pressure Based on Different Waterflood Curves

Sweep efficiency of waterflood volume is an important index for engineers to make dynamic analysis and evaluate waterflood susceptibility in waterflood field,especially it brings direct influence on recovery.Although it has great reference value for assessment on development decisions,the discipline of its changes still can＇t make certaim absolutely.The scholar Chen-yuanqian proposed the relationship formula between cumulative oil production,watercut and sweep efficiency of waterflood volume through derivation based on former research.However,this method is just used commendably on BingXing waterflood curve because of the calculation of limit recoverable reserves.This paper deducts the discipline on changes of sweep efficiency of waterflood volume,escaping this problem and established in primary relative permeability and P.V.T.test,and the relationship formula between it and formation pressure,as has some referrence meaning for engineers to evaluate sweep efficiency of waterflood volume and seek proper formation pressure maintenance level.