摘要
在前人研究的基础上,结合油田开发实际,对常规压敏公式进行了修正。考虑渗透率随有效应力的变化特征,通过积分变换处理推导出了新的压敏油藏产能方程,并通过与已有公式的对比证明了该方程的正确性和普遍适用性。利用新的压敏油藏产能方程,分析了压敏储层物性变化特征及压敏指数、地层压降和地层压力系数对油藏单井产能的影响,结果表明:压敏油藏储层物性变化特征具有压降漏斗特性;油井的产能随压敏指数的增大而降低;随着生产压差和压降的增大,油井产能相对损失越大,异常高压压敏油藏产能损失表现得更大。建议压敏油藏尤其是异常高压压敏油藏开发时须综合评估压敏指数、生产压差、地层压力系数和压降等参数对单井产能的影响,以确定合理的工作制度。
On a basis of previous researches and in combination with the actual oilfield developments,the conventional pressure-sensitive formula was revised.From the changes of permeability with effective stress,a new deliverability equation for pressure-sensitive oil reservoirs was derived by an integral transformation,and its reliability and general adaptability were confirmed by its comparisons with other known equations.Using this new deliverability equation,the petrophysical changes of pressure-sensitive reservoirs and the impacts of pressure sensitivity index,pressure drop and pressure coefficient on single-well deliverability in these reservoirs were analyzed,indicating that：（1） The petrophysical changes of pressure-sensitive reservoirs are characterized by a pressure cone of depression;（2） The deliverability of oil wells will decrease when the pressure sensitivity index increases;（3） The deliverability loss of oil wells will increase when the production drawdown and pressure drop increase,especially in pressure-sensitive reservoirs with abnormal high pressure.In order to establish a reasonable working system for developing pressure-sensitive reservoirs,especially for developing those with abnormal high pressure,it is advised that the impacts of parameters,such as pressure sensitivity index,production drawdown,pressure coefficient and pressure drop,on single-well deliverability should be comprehensively considered.
出处
《中国海上油气》
CAS
北大核心
2012年第1期29-32,54,共5页
China Offshore Oil and Gas
基金
中海石油(中国)有限公司综合科研重大专项"涠西南复杂断块油田优化注水技术研究与应用(编号:10009919)"部分研究成果
关键词
压敏
产能方程
修正与推导
有效应力
渗透率
pressure sensitivity
deliverability equation
rivision and derivation
effective stress
permeability
