有效压力对低渗透变形介质油藏物性的影响  

Influence of effective pressure on the physical property in low permeability deformation reservoir

作　　者：庞宏伟[1] 岳湘安[1] 李丰辉[1] 孙立旭 赵春 

机构地区：[1]中国石油大学,北京102249 [2]辽河石油学校,辽宁盘锦124000 [3]CNPC海外研究中心,北京100083

出　　处：《大庆石油地质与开发》2007年第1期50-53,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金："十五"国家科技攻关项目(2003BA613A-07-05)

摘　　要：为了确定开采压差对低渗透变形介质油藏开采的影响,通过文东地区实际岩心在有效压力作用下的岩石力学、变形和渗流模拟实验,对该油藏岩石变形特征和渗流特性进行了系统的研究。采用克氏渗透率来表征油藏渗流特征,确定变形稳定状态的平衡时间,结合岩石力学参数和物性参数结果进行综合分析。结果表明有效压力高低、施加压速度快慢和加压方式等对该油藏渗流和变形产生显著影响。常规“渗透率”在此油藏中不是一个常量,而是一个与有效压力和驱动压差相关的变量。压力初始变化大小和幅度严重影响储层变形程度,也对渗流特性产生影响,因此开采初期合理控制压差对油藏最终采收率的提高至关重要。The rock deformation characteristic and percolation property are studied systematically through core rock mechanic and core tests in Wendong region in order to define the influence of effective pressure drop on the low penneability deformation reservoir. The permeability measured by the Klinkenberg value is used to characterize percolation property, the stable deformation time is tested and the rock mechanic and core physical properties are analyzed comprehensively. It shows that pressure magnitude, pressure bringing velocity and methods, etc. play tremendous roles in rock percolation and deformation. The regular permeability is a variable that refers to effective pressure and driving pressure drop, the rock deformation and the percolation property are influenced seriously by initial pressure difference and scale, so it is particularly important to reasonably control initial pressure drop for enhancing oil recovery.

关 键 词：有效压力 低渗透 变形介质 岩心实验 

分 类 号：TE311[石油与天然气工程—油气田开发工程]