海上油田高速开发模式下剩余油分布特征及挖潜实践——以珠江口盆地惠州2A油田为例  

Remaining Oil Distribution Characteristics and Potential Tapping Practice under High-speed Development Mode in Offshore Oilfield-A Case Study of Huizhou2A Oilfield in Pearl River Mouth Basin

作　　者：侯博恒 谢明英 涂志勇 陈一鸣 柴愈坤 Hou Boheng;Xie Mingying;Tu Zhiyong;Chen Yiming;Chai Yukun(Shenzhen Branch of CNO0C China Limited,Shenzhen Guangdong 518000)

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：《中外能源》2023年第3期46-50,共5页Sino-Global Energy

摘　　要：针对海相砂岩油田开发后期剩余油分布复杂、稳产难度大的问题,以珠江口盆地南海东部海域第一个投产油田惠州2A油田为例,总结海上油田高速开发模式下剩余油分布模式。受韵律特征、夹层、构造等地质油藏因素以及开发策略、钻完井技术等影响,惠州2A油田开发后期剩余油主要分布在正韵律储层层内低渗段、夹层遮挡区以及构造高部位。其中,正韵律层内低渗段为油田开发后期剩余油挖潜的主要方向,该类型剩余油因早期开发策略、渗透率极差等因素影响,开发效果较差;后期采用双分支水平井或鱼钩状水平井,增大单井泄油面积,提高低渗储层开发效果。对于夹层遮挡区剩余油,受夹层厚度、夹层遮挡范围等因素影响,采用短水平井开发效果较好。对于构造高部位剩余油,需根据局部构造大小、生产井井距等因素综合考虑挖潜策略。近5年来,惠州2A油田共实施5口调整井,且均在正韵律储层层内低渗段,单井平均日产油147m^(3)/d,油田含水率下降3%~10%。In view of the issues of complicated distribution of remaining oil and difficulty of stable production of marine sandstone oilfield in the late development period,Huizhou2A Oilfield,the first one put into production in the eastern sea area of the South China Sea in the Pearl River Mouth Basin,was studied as a case to summarize the remaining oil distribution model under the high-speed development mode in offshore oilfield.Due to the influence of geological reservoir factors such as rhythm characteristics,interlayer and structure,development strategy and drilling and completion technology,the remaining oil in the late development period of Huizhou2A Oilfield mainly distributes in the low permeability section of positive rhythm reservoirs,interlayer occlusion area and high structural position.Among them,the low permeability section in the positive rhythm layers is the main direction of remaining oil potential tapping in the late stage of oilfield development,and the development effect of this type of remaining oil is poor due to the influence of early development strategy,permeability ratio and other factors.In the later stage,double branch horizontal well or fishhook horizontal well may be used to increase the drainage area of single well and improve the development effect of the low permeability reservoirs.For the remaining oil in the interlayer occlusion area,the development effect of short horizontal well is better due to the influence of interlayer thickness,interlayer occlusion range and other factors.For the remaining oil at the high structural position,the potential tapping strategy should be considered comprehensively according to the local structural size,well spacing and other factors.In recent5 years,a total of 5 adjustment wells have been implemented in Huizhou2A Oilfield,and all of them arien the low permeability section of positive rhythm reservoirs.The average daily oil production of a single weilsl 147m^(3)/d,and the oilfield water cut has decreased by 3%-10%.

关 键 词：剩余油 低渗 泄油面积 开发效果 

分 类 号：TE5[石油与天然气工程—油气田开发工程]