大庆台肇地区低渗透砂岩储层裂缝动态研究

动态资料综合分析表明,台肇地区发育有以近东西向为主的天然裂缝,并对裂缝的体积、宽度、 高度和渗透率等参数进行了分析。受储层中天然裂缝和北西西-南南东向现今地应力场影响,研究区人工 压裂缝的延伸方向主要为近东西向,与研究区东西向主渗流裂缝方向一致,它们互相沟通,是研究区东 西向油井见水早,含水上升快和压力上升快的主要原因。针对裂缝对注水开发的影响,对该区的开发调 整方案进行了分析,认为改变水流方向,可有效地控制含水上升速度,提高水驱效果;同时,通过注水 井排上水淹井的转注,形成东西线状注水,也是改善研究区注水开发效果的有效手段。

Dynamic Study on Low Permeability Sandstone Reservoir Fractures in Taizhao Area of Daqing Oilfield

A comprehensive analysis on dynamic data indicates that near EW natural fractures are grown mainly in Taizhao area. The parameters of fracture volume, its width, height and permeability are analyzed. Influenced by natural fractures and insitu stress field of WW-SSE the expansion of artificial fractures is mainly of near EW in the studied area? which is consistent with major perculation fracture of EW, they are communicated each other, it is the major cause of water production, water cut increase and rapid pressure buildup in EW of the area. In consideration of the influence of waterflooding, the adjusted development project is analyzed, it is considered that changing water flow direction can effectively control the speed of water-cut increase, improve waterflooding efficiency. At the same time the creation of EW linear water injection by converted injection on water injection well array is an effective way for improving production efficiency of waterflooding in the area.