底水油藏底水分布规律及射孔参数优化——以周长油田延安组油藏为例  

Research on bottom water distribution law and parameter optimization of bottom water reservoir:A case of Yan’an Formation reservoir in Zhouchang Oilfield

作　　者：王攀[1] 曹宗 陈浩 王振龙 WANG Pan;CAO Zong;CHEN Hao;WANG Zhenlong(Water Injection Project Management Headquarters of Yanchang Oilfield,Shaanxi Yan’an 716000,China)

机构地区：[1]延长油田股份有限公司注水项目区管理指挥部,陕西延安716000

出　　处：《非常规油气》2024年第3期139-148,共10页Unconventional Oil & Gas

基　　金：陕西省重点研发计划项目“可循环再利用CO_(2)强化置换排油机制研究”(2021GY-112)。

摘　　要：为了明确射孔参数底水油藏开发的影响,针对由于早期布井随意性较大,无井网格局,无具体的开发方案,导致研究区采油速度低、递减快,稳产难度大的问题,运用油藏地质参数分析和油藏数值模拟的研究方法,分析不同射孔参数条件下,不同类型底水油藏开发效果。结果表明:1)研究区主力油层延10层底水发育,水井射孔注水厚度大小不一,对应油井受效和开采效果有明显差异;2)依据夹层分布和油水接触关系,目标油藏分为直接接触型、不稳定夹层型和稳定夹层型3类;3)Ⅰ类底水直接接触型水井射孔程度越高,越有利于抑制底水突进;最优油井射孔程度约为2 m;4)Ⅱ类/Ⅲ类型隔层分隔底水型水井射孔程度越高,开发效果越好;油井射孔程度约为70%时,开发效果好。该研究成果对同类型底水油藏开发参数设计及稳油控水提高采收率具有指导意义。The recovery rate is low,production declines fast,and stable production is difficult due to the strong randomness of early well layout,no well pattern and no specific development plan in the study area.To clarify the influence of perforating parameters on the development of bottom-water reservoirs,the reservoir geological parameter analysis and reservoir numerical simulation were used to analyze the development effects of different bottom-water reservoirs under different perforating parameters.The results show that:1)The oil well response and development effect are different due to the perforated thicknesses in water injection wells in Yan10 Formation,the main oil layer with well-developed bottom water in the study area.2)The target reservoir can be divided into direct contact type,unstable interlayer type,and stable interlayer type according to the interlayer distribution and the oil/water contact relationship.3)The higher the perforation degree,the more beneficial it is to inhibit bottom water inrush,and the best perforation thickness is about 2 m in typeⅠreservoir directly contacting bottom water.4)The higher the perforation degree of the water injection well,the better the development effect;the development effect is good when the oil well perforation degree reaches about 70%in typeⅡ/Ⅲreservoir separated from bottom water by interlayers.The research results have guiding significance for the design of development parameters,the oil stabilization and water control,and enhanced oil recovery for the same type of bottom water reservoirs.

关 键 词：底水油藏 射孔厚度 数值模拟 参数优化 隔层 

分 类 号：TE341[石油与天然气工程—油气田开发工程]