DWL技术开发底水油藏采收率影响因素分析  

Research on recovery influential factors of bottom water reservoir by using DWL technology

作　　者：唐潮 陈小凡[1] 刘峰[1] 党文平 苏花卫[2] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]承德石油高等专科学校石油工程系,河北承德067000

出　　处：《油气藏评价与开发》2014年第2期19-23,共5页Petroleum Reservoir Evaluation and Development

基　　金：国家科技重大专项"剩余油分布综合预测与精细注采结构调整技术"(2011ZX05010-002)

摘　　要：关于砂岩底水油藏,无论是在见水时间、开发机理,还是临界产量等方面,均有大量的研究成果。但以上方法在综合考虑抑制底水锥进效果和油田开发效益方面均不是很理想。为解决该问题,A.K.Wojtanowicz提出了井底循环排液(DWL)技术开发底水油藏的新方法,不仅提高了油井的临界产量,而且延长了油井的有效生产时间。基于DWL技术建立机理模型,利用油藏数值模拟方法分析上部射孔段日产液速度,下部射孔段注入与排出液体速度,注入与排出射孔段距离和油层与底水厚度比对油藏采出程度的影响。实例证明:上部射孔段日产液速度和下部射孔段注入与排出液体速度相等,注入与排出射孔段距离较大,油层与底水厚度比较小时,油藏的开发效果较好。为利用DWL技术合理、高效地开发底水油藏提供了理论基础。Studying from water breakthrough time, development mechanism, critical production, there are a lot of achievements about sandstone bottom water reservoir. However, the above methods are not effective to inhibit bottom water coning, or oilfield development benefit. In order to solve these problems, A. K. Wojtanowicz put forward the bottom hole circulating drainage （DWL） technology to exploit bottom water reservoir. This method not only improved the critical production, but also prolonged the net production time of oil wells. Based on DWL technology, mechanism model was established. By using reservoir numerical simulation method, this paper analyzed recovery influential factors, such as daily fluid production rate of upper perforated interval, injection and the discharged liquid velocity of lower perforated interval, perforation length of injection and drainage, ratio of reservoir thickness and bottom water thickness and its effects on recovery. Examples show that daily fluid production rate of upper perforated interval is equal to injection and discharged liquid velocity of lower perforated interval. When injection distance and drainage distance are larger, and ratio of reservoir thickness and bottom water thickness is smaller, reservoir development effects are better. This result provides theoretical basis for reasonably using DWL technology and effectively developing bottom water reservoir.

关 键 词：井底循环排液技术 直井 底水 产能 

分 类 号：TE323[石油与天然气工程—油气田开发工程]