海上礁灰岩油田水驱剩余油分布规律及精准挖潜新策略  

Distribution Rule and New Precise Development Strategy of Remaining Oil in Offshore Reef Limestone Oilfield

作　　者：刘平 LIU Ping(Shenzhen Branch of CNOOC(China)Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518000

出　　处：《化工管理》2022年第12期165-168,共4页Chemical Engineering Management

基　　金：中海石油(中国)有限公司深圳分公司科研课题《南海东部生物礁灰岩油田提高采收率研究》。

摘　　要：L油田为南海珠江口盆地大型生物礁灰岩稠油底水油田,由于储层发育裂缝,非均质性强,储层精细描述难度大,导致后期挖潜困难。针对目前油田生产中出现井间调整井钻遇储层含油性好,而投产后开采效果差异大、80 m处储层未动用等问题,结合密闭取心资料,以生产动态为导向,根据基质和裂缝双孔介质渗流理论,建立理论的双孔介质油藏数值模型开展剩余油分布和挖潜策略研究,研究结果表明,由于储层发育裂缝且原油稠,底水沿着裂缝系统快速锥进井底,裂缝系统水淹,而基质系统近井地带得到动用,井间基本未动用,从而总体上形成“基质系统富集剩余油,裂缝系统已网状水淹”的分布规律;进一步研究发现,不同于常规以寻找剩余油为主的思路,礁灰岩油藏应该遵循“精准挖潜开采效果好的区域”的策略,该创新性策略在L油田取得了很好的应用效果,从而对未来改善类似礁灰岩油田挖潜效果具有重要的指导意义。L oilfield is a large reef limestone heavy oil bottom water oilfield in The Pearl River Mouth basin of the South China Sea.Due to the development of fractures and strong heterogeneity of the reservoir,it is difficult to describe the reservoir fine,resulting in difficulties in tapping potential in the later stage.In oil field production in cross-hole good adjustment well drilling in oil in the reservoirs,and the large difference of mining effect,after the production of the reservoir in the 80 m place use problems of combination of pressure coring data and production performance oriented,based on the matrix and fracture dual pore medium seepage theory,the theory of dual pore medium reservoir numerical model is set up to carry out remaining oil distribution and potential in strategy research.The results show that,due to the development of fractures and thick crude oil in the reservoir,the bottom water quickly conical into the bottom of the well along the fracture system,and the fracture system is flooded,while the matrix system is utilized near the well zone,and the well is basically not utilized,thus forming the distribution law of"the matrix system accumulates remaining oil,and the fracture system is netted flooded".Further study found that the conventional to the thinking of looking for residual oil is given priority to,the reef limestone reservoir should follow the strategies of accurate potential in mining areas with good effect,the innovative strategy in L oilfield has obtained the good application effect,so as to improve for the future similar reef limestone oilfield exploration results have important guiding significance.

关 键 词：裂缝 双孔介质 剩余油分布规律 网状水淹 精准挖潜策略 

分 类 号：TE53[石油与天然气工程—油气田开发工程]