吐哈低渗透油田有效驱替压力研究

THE STUDY ON EFFECTIVE DRIVING PRESSURE FOR LOW PERMEABILITY RESERVOIRS IN TUHA OILFIELD

针对吐哈油田几个低效区块,从启动压力梯度入手,深入分析了启动压力梯度与渗透率的关系,以及启动压力梯度对压力分布、含水率、采液指数、采油指数、单井产能的影响,首次从有效驱替压力梯度的角度对合理井距进行论证,揭示了油井长期不见效的根本原因,为低效区块今后的调整提供了理论依据。

In view of the several low effective blocks in Tuha oilfield,the relation between initial pressure gradient and permeability was analyzed carefully.The effect of initial pressure gradient on pressure distribution,water cut,pro- ductivity index,individual well productivity were deeply investigated.For the first time,rational well spacing was discussed from the viewpoint of effective driving pressure gradient,the key reasons why there wasnt effectiveness in a long period in some production wells were found out,which can be theoretical base of low effective blocks adjust- ment.