密井网条件下断层边部剩余油挖潜方法--以萨北开发区纯油区西部为例

摘要

After nearly 50 years of development,western pure oil areas of north Saertu development area has came into the late high water cut,and well density has been reached 100 km2/well.This situation and the yield gradually increased demand contradictory,the underground remaining oil shows overall highly scattered,relatively concentrated in local "pattern".Due to the shielding effect of the fault,the surplus oil are mainly distributed in the fault boundary area.In this paper,we take north Saertu development area west of 76-2 # fault as an example.By optimization of the parameters of well-type and well location, we choose large displacement directional well finally,and establish a numerical simulation model for the study area.By comparing the deployment on the fault location,the distance,between wells and fault plane,oil and water wells,we determine the distance are respectively 50 m,70 m,120 m.%大庆油田萨北开发区纯油区西部经过近50年的开发，现已处于特高含水阶段，井网密度达到100 km2/口，此种情况与产量逐渐上升的需求相互矛盾，地下剩余油呈现出“整体高度分散、局部相对富集”的格局。由于断层的遮挡作用，剩余油潜力区主要集中在断层边部。以萨北开发区纯油区西部76-2#断层为例，通过优选高效井井型，最终确定在断层边部部署大位移定向井，并建立适用于研究区的数值模拟模型。通过比较断层上下盘的井位部署情况、高效井与断层面距离及与油水井不同距离下的产油及含水率情况，最终确定大位移定向井在断层下盘、与断层面距离50 m、与油井距离70 m、与水井距离120 m 为最佳方案。