大庆油田特高含水期层系井网重构技术研究与应用

Study and application of strata & well pattern reconstruction technique at extra high water cut stage in Daqing Oilfield

大庆油田进入特高含水期后,层系井网暴露的矛盾日益凸显,急需通过调整来缓解矛盾、改善开发效果,进一步提升开发水平。从理论研究入手,利用物理模拟实验、数值模拟等方法,认清特高含水期层间及平面矛盾产生的机理,在理论研究的基础上,确定层系井网重构的技术经济界限,确定层系井网重构的原则及方式,并在X试验区开展现场试验,采收率由试验前的51.30%提高到56.79%。大庆油田层系井网重构技术的研究与实践表明:渗透率差异是层间和井间干扰的内因;井距均匀程度是井间干扰的外因,是最容易人为改善的因素;在内因和井距共同作用下,含水饱和度差异干扰层间和井间流动规律。通过细划层段、细分开发对象和适当加密可以缓解这些矛盾,改善开发效果。

Problems on strata & well pattern appeared at extra high water cut stage in Daqing Oilfield,and contradiction should be relieved and development effect should be improved through adjustment. Physical modeling and numerical simulation were applied to understand the mechanisms of interbedded and plane contradiction at the extra high water cut satge. Based on the theoretical research,the technical and economic limits,principles,and pattern of strata & well pattern reconstruction were determined,the field trials was carried out in X pilot area,and the recovery efficiency increased from 51.30% to 56.79%. Research and practice on the strata & well pattern reconstruction in Daqing Oilfield indicate that the difference of permeability is the internal cause of interlayer and well interference,the uniformity of well space is the external cause of the well interference,which is the easiest to be artificially improved. The difference of water saturation affects flow among layers and wells under the action of the internal and external causes. Development effect can be improved by dividing strata and development object in more detail and by thickening well pattern appropriately.