CAJ | 학술논문

采油速度是决定油田开发效果好坏的重要开发指标之一，采油速度太高或者太低都将影响油田的最终开发效果，因此研究理论采油速度及影响因素对于油田生产决策至关重要。前人主要基于油藏数值模拟及数理统计方法来研究油藏采油速度，但是无论在理论还是应用角度上都存在一定的局限性。基于含水率分流方程，建立了采油速度与油藏属性、含水率及含水上升速度之间的关系表达式，分析了各因素对采油速度的影响。理论分析表明，油水相对渗透率比值与含水饱和度之间回归的系数b值对采油速度为负相关影响；对于含水率，当 fw<50%时为负相关影响，当fw>50%时为正相关影响；而不同含水率阶段，含水上升速度越快，则采油速度越大。该方法可用于具体油藏不同开发阶段的理论采油速度的评价。
채유속도시결정유전개발효과호배적중요개발지표지일，채유속도태고혹자태저도장영향유전적최종개발효과，인차연구이론채유속도급영향인소대우유전생산결책지관중요。전인주요기우유장수치모의급수리통계방법래연구유장채유속도，단시무론재이론환시응용각도상도존재일정적국한성。기우함수솔분류방정，건립료채유속도여유장속성、함수솔급함수상승속도지간적관계표체식，분석료각인소대채유속도적영향。이론분석표명，유수상대삼투솔비치여함수포화도지간회귀적계수b치대채유속도위부상관영향；대우함수솔，당 fw<50%시위부상관영향，당fw>50%시위정상관영향；이불동함수솔계단，함수상승속도월쾌，칙채유속도월대。해방법가용우구체유장불동개발계단적이론채유속도적평개。
Recovery rate is one of the key development index which can affect the ultimate development effect of oilfields whether it remains high or low,therefore,the researches of reasonable recovery rate and influence factors play an important role in production decision of oilfields. Previous authors researched the recovery rate mainly based on reservoir numerical simulation and mathematical statistics,however,the certain limitation is both theoretic and applied aspects. Based on the flow fraction equation,we create the relation expression among recovery rate and reservoir properties,water cut and annual ascending velocity of water cut,and analyze the influence of individual factor on recovery rate. The theoretical analysis result shows that coefficient b by regression between ratio of oil to water relative permeability and water saturation is negative correlation to recovery rate. Water cut is negatively correlated to recovery rate when fw<50%,and positively correlated when fw>50%. At different stages of water cut,the faster the velocity of water cut ascends,the higher recovery rate could be. The method discussed in this paper could be applied to the evaluation of theoretical recovery rate of certain reservoir at different development stages.