靖边油田靖探721井区长6超低渗油藏水平井井网布井探讨

The Discussion for the Horizontal Well Pattern of Chang-6 Ultra-low Permeable Oil Layer of Jingtan 721 Area in Jingbian Oil Field

以鄂尔多斯盆地长6层为主的超低渗透油气资源在中国低渗油气资源中占据主要部分,具有巨大的开发潜力,但是超低渗油田岩性致密、储层非均质性强等特征导致其开发难度大。针对该类油藏的储层特点,论文以靖边油田靖探721井区域实际地质情况为基础,建立数值模拟模型,对该类超低渗油藏水平井井网开发进行优化研究,优化结果表明:水平井方位垂直于最大主应力方向、水平段长度为700~800m、压裂裂缝密度为1.5×10^-2条/m、裂缝半长为100~150m、采用纺锤型裂缝布放模式、注采井距为500~600m、排距为130~150m的水平井井网系统有更好的开发效果,研究结果对靖边油田靖探721井区域长6超低渗透油田水平井井网开发具有指导意义。

In the low permeable oil-gas resources of our country, ultra-low permeable resources which is represented by Chang-6 oil layer in Ordos Basin occupied the main part and has great development potential. However, with the characteristics of find and close lithology and strong reservoir heterogeneity, etc., it is difficult to develop the ultralow permeable oil field. In this article, according to the characteristics of such reservoirs, based on the practical geological situation of Jingtan 721 area in Jingbian oil field, numerical simulators were built and the optimization research for the horizontal well pattern in such ultra-low permeable resource was carried out. The research results show that the horizontal well pattern has a better development effect while the horizontal direction is perpendicular to the direction of maximum principal stress;the horizontal length is 700~800 m;the density of artificial fracture is 1.5×10^-2 m^-1;the half length of fracture is 100~150 m;the artificial pressure crack pattern is spindle-shape;the injector producer distance is 500~600 m;the row spacing is 130~150 m. The research results have a guiding significance for the horizontal well pattern development of Chang-6 ultra-low permeable oil layer of Jingtan 721 area in Jingbian oil field.