萨中油田超短半径水平井潜力井层的判定方法探讨

Methods for Judging Potential Well and Layer of Ultra-short Radius Horizontal Well in Sazhong Oilfield

结合数值模拟研究成果和实际开发状况分析结果,以剩余油分布规律研究为基础,充分考虑油层砂体的发育及规模状况、开发井网的注采关系完善程度及油层的整体经济效益等因素,确定超短半径水平井潜力井层的判定原则。应用数值模拟软件和多元回归分析得到了计算注水正韵律油层10年累积产油量的多元相关公式,并对水平井10年累产油影响因素进行敏感性分析,确定了有效厚度、油水井距、剩余油饱和度、无因次距顶厚度等各参数的界限。实施的2口侧钻短半径水平井均获得较好的开采效果,综合含水下降幅度超过20%,32mon生产期累计增油1600t。

Combined with numerical simulation results and the actual development situation analysis results,and the study of residual oil distribution study,the sand growth and the scale of reservoir sand body,degree of injection-production relationship perfection of development pattern,overall reservoir economic benefits and so on are fully considered,the potential judging principle of ultra-short radius horizontal well is determined.With the application of numerical simulation software and multiple regression analysis,the multiple correlation formula that can calculate water injection of positive rhythm reservoir cumulative oil production are obtained.Implementation of the two sidetracking short radius horizontal wells obtain good effect of production,comprehensive water cut decreases more than 20%,cumulative oil production increases 1600 tin 32months.