不同气顶指数油藏注采策略研究及应用  

Research of Reservoirs Injecting Strategy for Different Gas Cap Index and Its Application

作　　者：姜永 刘洪洲 张振杰 王迪 汪跃 

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300450

出　　处：《油气井测试》2017年第4期25-27,共3页Well Testing

基　　金：国家自然科学基金重点项目"储层裂缝形成机理"(40772089)内容

摘　　要：渤海黄河口凹陷气顶边水油藏具有一砂一藏、储层薄,储量规模小、气顶指数差异大等特点,单砂体水平井注水开发存在巨大挑战。通过分析不同气顶指数油藏合理地层压力水平、注水策略、提液界限等发现,对于小气顶油藏,应早期注水,合理地层压力水平在90%~95%左右,位于饱和压力附近,提液时机在气顶气采出程度大于25%后;中等气顶油藏,早期注水不考虑气亏空影响,压力维持水平在70%~80%左右油气采收率最高,提液时机在气顶气采出程度大于40%后;大气顶油藏,合理地层压力水平在60%左右,初期依靠天然气顶能量开采,后期结合人工注水适当提液采油。通过研究成果的应用,渤中26-3油田带气顶砂体开发效果得到了明显改善,砂体采收率平均提高1.5%。该成果对类似气顶油藏在"油气同采"模式下注水开发具有重要的指导意义。Yellow River Mouth Sag of Bohai gas water reservoir has characteristics of one sand and one reservoir,thin reservoir,small reserves scale,big differences of gas cap index,and mono sand body horizontal water flooding development has a huge challenge.Through analyzing the different reservoir gas cap index reasonable level of formation pressure,water policy,extract boundaries,it is found that for stingy top reservoir,water should be early injected,the reasonable formation pressure level is about 90% to 95%,located near the saturation pressure,the extract timing is after the extent of gas cap gas recovery greater than 25%;for medium gas cap reservoir,without considering the impact of the gas during early water injection,oil and gas recovery rate is biggest when the pressure maintain in about 70% to 80%,the extract timing is after the extent of gas cap gas recovery greater than 40%;for large gas cap reservoir,reasonable formation pressure at around 60%,the initial top energy by natural gas mining,post the appropriate combination of artificial water extract oil.By applying the above achievements,development effect of BZ 26-3 oil field with a gas cap sands has been significantly improved,and recovery rate of the sand increases 1.5% averagely.This result has great significance for development by water injection to similar gas cap reservoirs on pattern of 'simultaneous production of oil and gas'.

关 键 词：气顶油藏 气顶指数 地层压力 注水方案 提液策略 

分 类 号：TE357[石油与天然气工程—油气田开发工程]