摘要
应用胶体与表面化学原理,从微观角度阐述低渗透储层固液两相体系边界层形成的机理;建立五点井网整体压裂垂直裂缝非达西渗流模型,研究了非达西渗流对油井日产量、累计产量、注水见效时间、见水时间、无水采收率以及含水率的影响。研究表明,造成低渗透多孔介质非达西渗流的边界层是在一系列物理化学作用中形成的,反应过程分为固液相吸附阶段与物理化学反应阶段;随着启动压力梯度的增大,油井日产油量、累计产油量减小,注水见效时间延长,见水时间提前,无水采收率降低,含水率增大。研究结果对于低渗透油田的开发具有指导意义。
Using gel and surface chemistry concept, this paper addresses bound layer mechanism of solid-liquid system in low permeability reservoirs from a microscopic view, establishes a non-Darcy percolation model of vertical fractures for bulk fracturing with five-spot pattern, studies the impact of non-Darcy flow on daily oil production, cumulative production, waterflood response time, breakthrough time, breakthrough recovery and water cut. The study shows that the bound layer of non-Darcy flow in low permeability porous media is resulted from a series of physicochemical actions. The course of reaction can be divided into solid-liquid adsorption stage and physicochemical reaction stage. As the increasing of threshold pressure gradient, daily oil production and cumulative production decrease, the time of waterflood response prolongs, breakthrough time moves up, breakthrough recovery reduces, and water cut increases. The result of this study may guide the development of low permeability reservoirs.
出处
《特种油气藏》
CAS
CSCD
2008年第3期52-55,共4页
Special Oil & Gas Reservoirs
基金
教育部新世纪优秀人才资助项目(NCET-06-0089)资助
关键词
非达西渗流
启动压力梯度
微观描述
油田开发
低渗透油田
non-Darcy flow
threshold pressure gradient
microscope description
oilfield development
low permeability reservoir
