摘要
特低渗透油田原油开采过程中，部分原油无法被动用开采出来。从特低渗透油田的启动压力梯度出发，分析原油未被开采的原因，并计算原油采收率。某特低渗透油藏可抽象成双重孔隙介质油藏，满足非达西运动规律，以质量守恒定律为基础推导出平衡解启动压力梯度公式，计算出合理启动压力梯度，再由压力分布规律计算出启动压力梯度对应下的可采半径，得到油田可采面积，进而计算出改变油田井距对应的原油采收率。
In the development of extra-low permeability oilfield, some oil cant be swept and produced. The reason is analyzed in respect of kick off pressure gradient of extra-low oilfield, and recovery ratio is calculated. An extralow permeability reservoir can be abstracted to dual porous reservoir which follows non-Darcy law ; kick off pressure gradient equation with equilibrium solution is derived on the basis of material balance law, rational kick off pressure gradient is calculated, recoverable radius according with kick off pressure gradient can be calculated through pressure distribution pattern, thus obtain the recoverable area of the oilfield, and then the oil recovery ratio corresponding with varied well spacing.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2011年第3期104-109,共6页
Petroleum Geology & Oilfield Development in Daqing
关键词
特低渗透
双重孔隙介质
启动压力梯度
可采半径
采收率
extra-low permeability
dual porous medium
kick off pressure gradient
recoverable radius
recovery ratio
