任11井山头注氮气可行性研究

碳酸盐岩潜山油藏是华北油区的主要油藏类型,其动用地质储量占全油区的60%左右,目前已进入高含水开发期,如何挖潜剩余油潜力,进一步提高采收率,是目前的主要工作方向。针对任11井山头块状底水潜山油藏的地质及生产特点,分析了注氮气提高采收率的机理及有利地质条件;在数值模拟的基础上,论证了任11井山头注氮气提高采收率的可行性,对注气井数、油气水平衡时间、采液速度、注气采油方式、注气速度、注气时机和开发井网等技术政策界限进行了优化研究。研究结果表明,任11井山头在一定工艺技术保障下,注氮气提高采收率是可行的,预计注气形成的富集油带厚度约200m,采收率提高4%左右。

Feasibility Study on EOR by Nitrogen Injection Process in Ren 11 Well Buried Hill Reservoir, North China

As a major reservoir type in North China's oil domain,buri ed hill reservoirs accounting for about 60%of the total producing OOIP have bee n into high water-cut development stage.How to dig the remaining oil potenti al and enhancing oil recovery further is dominant work target now.The EOR mech anism by nitrogen injection process and geologic condition are analyzed in the l ight of geology and production characteristic of massive carbonate reservoir wi th bottom aquifer in Ren11Well buried hill.Based on the numerical simulation ,feasibility of EOR by nitrogen injection process is discussed,providing studi es on optimization of well number of nitrogen injection,equilibrium time of oil ,gas and water,fluid production rate,process of gas-injection recovery,gas injection rate and timing,well pattern,etc.Results show that EOR by nitrogen injection process in Ren11Well buried hill reservoir is feasible under the sup port of technology available,with estimated oil-en-riched zone thickness form ed by nitrogen injection about 200m and incremental recovery about 4%.