致密油储层水平井产能影响因素研究  

Study on the Horizontal Well Production in Tight Oil Reservoirs

作　　者：彭晖[1] 刘玉章[1] 冉启全[1] 王欣[2] 童敏[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《天然气地球科学》2014年第5期771-777,共7页Natural Gas Geoscience

基　　金：国家高技术研究发展("863")计划项目课题"致密砂岩油气藏数值模拟技术与软件"(编号:2013AA064902)资助

摘　　要：致密油储层致密,开发难度大,产能影响因素多。为研究致密油储层地质特征、水平井方位以及布缝方式等因素对单井产能的影响,采用数值模拟方法,分别建立了压裂水平井的单井模型,研究不同参数对产能的影响,并定义了影响因子,量化油藏地质参数对不同阶段单井产量的影响。结果表明,天然裂缝的导流能力决定了单井初期产能的高低,而产量递减速度主要取决于基质孔隙度的大小;在初期阶段产能的主要影响因素是天然裂缝的导流能力,后期阶段主要影响因素是基质孔隙度。当水平井筒方向与裂缝方向垂直时,通常获得较大的产能;体积压裂形成的网状缝可以大大改善开发效果,但是在网状缝难以形成时,通过增加压裂段数,可以达到相近的开发效果;合理地交错布缝,可以有效地采出缝间及井间的储量,从而大大改善开发效果。Great challenges exist in the development of tight oil reservoirs. In order to examine the influences of geological characteristics, the orientation of horizontal wells and fracture patterns on the horizontal well production, reservoir simulation models for the fractured horizontal well were built to investigate these influences. The influence index was used to quantify the effects of these geological parameters. It is indica ted that,the conductivity of natural fractures is the crucial factor to the initial productivity,and the matrix porosity is the most important factor to the decline rate. During the early period, the conductivity of natural fractures plays an important role, so does the matrix porosity during the late period. The orientation of hor- izontal wells should be coordinated with the orientations of natural fractures and hydraulic fractures, so as to get the highest productivity. The reasonable fracture pattern should reach an improved development.

关 键 词：致密油 水平井 布缝方式 网状缝 缝控单元 

分 类 号：TE33[石油与天然气工程—油气田开发工程]