摘要
挥发性油藏注天然气极易形成混相驱,注气突破后油藏中非混相和混相驱同时存在,并动态变化。基于多个挥发油藏注天然气开发的生产曲线,推导了累积产油量变化的微分方程,并在此基础上提出了采出程度和气油比关系方程,可以预测不同生产气油比时的采出程度。同时提出了一种新型的气驱特征曲线,即注气达到一定阶段后,累积注气量的对数与累积产油量满足线性关系,该方程可以预测不同注气量下的累积产油量。经过实例分析和计算,表明该方法预测精度较高,具有较好的适用性和可行性。
Natural gas injection in volatile reservoir is easy to be miscible. After gas injection breakthrough, immiscible and inisci- ble flooding coexist in the reservoir and change dynamically. Based on production curves of volatile reservoirs developed with natu- ral gas injection, the differential equation of cumulative oil production variation is deduced and the equation of degree of reserve re- covery with GOR is put forward to predict the relation between them. Meanwhile, a new gas drive characteristic curve is proposed. That is, after gas injection reaches a certain phase, there exists the linear relation between logarithm of cumulative gas injection vol- ume and cumulative oil production, and the equation can be used to predict the cumulative oil production under different gas injec- tion volume. The results of examples＇ analysis and calculation indicate that this forecasting method has higher accuracy, and better serviceability and feasibility.
出处
《油气藏评价与开发》
2013年第6期19-23,共5页
Petroleum Reservoir Evaluation and Development
基金
国家重大专项"西非
亚太及南美典型油气田开发关键技术研究"(2011ZX05030-005)资助
关键词
挥发油
注天然气
混相驱
气油比
开发指标
volatile oil, natural gas injection, miscible drive, gas-oil ratio, development index
