深层低渗透油层渗流规律与水驱油特性研究

深层低渗透率油藏的渗流规律及水驱油特性具有特殊性。本文通过中原油田文13北块的岩心试验资料的分析、研究,表明深层低渗透率油藏单相流体渗流表现为非达西流动,渗透率越低,启动压力梯度越高。油水两相流动反映出束缚水饱和度高,油水两相流动范围窄;垂直于裂缝方向流动的储层采收率最高。为该块及同类型油藏分析剩余油分布规律、制定合理的提高采收率方案提供了依据。

A study on filtering flow rules and water-oil displacement characteristics in deep pay and low permeability oil reservoirs

The filtering flow rules and water-oil displacement characteristics in deep pay and low-permeability reservoirs has some specialities. Through analyzing and studying core experiment data of north block of Wen-13 in Zhongyuan Oilfield,this paper shows that single fluid flow in deep pay and low-permeability reservoirs appear to be non-Darcy fluid flow characteristics,and the lower the permeability is,the higher the kickoff pressure gradient is. The water-oil two phases flow reflects that irreducible water saturation is high and the area is narrow for oil-water two phases flows;the oil recovery factor is the highest one in the reservoir which flows perpendicular to the direction of fractures. Some references have been provided for this block and other similar reservoirs to analyze the distribution rule of residual oil and to formulate enhance oil recovery program.