碳酸盐岩油藏单井缝洞型储集体开采规律试验

Experiment on production laws for single well in vuggy carbonate reservoir

根据塔河油田油藏地质特点和开发方式,利用相似分析,进行模拟油藏条件下的弹性开采、注水开采、后期注气3个开采阶段的物理模拟试验,研究缝洞型油藏不同开采方式下的渗流规律及其主要影响因素。结果表明:衰竭速度对采出程度、含水率、气油比影响不大;在同样的开采条件下,射孔位置上移可以增加注水后的衰竭周期,也有利于提高采出程度;重质组分含量高,则无水开采期较长;在地层高温条件下,黏度的影响会显著降低;只要保证合理的衰竭速度,密度差异对开发动态的影响不显著;缝洞构成对实施注水后衰竭开发影响较小,但是对注气后衰竭开发影响较大。

Based on the geology and development performance of Tahe Oilfield, a suit of physical simulation experiments in stage of elastic production, waterflood, late gas injection were carried out at near reservoir conditions. And the flow laws and dominating influence factors of different production models were studied. The results show that the effects of depletion rate on oil recovery,water cut and gas oil ratio（GOR） are not obvious. The perforation location shift could increase the cycle number and oil recovery. The water free production duration is long at high weight component concentration. At high temperature of formation conditions, the viscosity is not the dominated factor. As long as the depletion rate is rational, the density variation has little effect on production performance. The vuggy fractured structure has little effect on depletion development of postwaterflood and has an important effect on depletion development after gas injection.