基于复势叠加原理的油藏天然能量评价新方法  

Evaluation of Natural Energy by Material Balance Method Based on the Princeple of Complex Potential Superposition

作　　者：陈肖 缪云 李伟 王伟峰 廖梦娜 Chen Xiao;Miao Yun;Li Wei;Wang Weifeng;Liao Mengna(Shenzhen Branch of CNOOC(China)Co.,Ltd.,Guangdong,518054)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东518054

出　　处：《当代化工研究》2023年第9期105-107,共3页Modern Chemical Research

摘　　要：针对构造岩性油藏天然能量评价过程中砂体大小、边界和物性等参数难以界定的问题,本文采用复势叠加原理,将整个油藏转换为单点进行研究,通过观测点单位压降下的水侵量分析天然水体大小。本研究基于南海东部油田L构造岩性油藏,选择最靠近油水界面处势能最高的生产井为参考点,将L油藏简化为一口井进行分析,根据弹性不稳定渗流理论,判断供给边界类型,最后计算水体倍数。研究结果表明:与常规的物质平衡法相比,基于复势叠加原理,将无限大地层中油藏转化为单点分析,可避免岩性构造油藏内部非均质性影响,计算的水体大小为156倍,最大水侵速度3500立方米/天,计算结果更加准确。该研究成果可实现开发初期定量判断天然能量大小和油藏内部连通性,指导新油田注水时机,并为老油田滚动开发及油藏精细注水提供依据。In order to solve the problem that parameters such as sand body size,boundary and physical property are difficult to define in the natural energy evaluation process of structural lithology reservoir,this paper adopts the principle of complex potential superposition to convert the whole reservoir into a single point for study,and analyzes the size of natural water body through the water intrusion per unit pressure drop of observation point.Based on the lithologic reservoir of L structure in the eastern oilfield of the South China Sea,the production well closest to the oil-water interface with the highest potential energy is selected as the reference point,and the L reservoir is simplified into one well for analysis.According to the elastic unstable seepage theory,the supply boundary type is determined and the water multiple is calculated.The results show that,compared with the conventional material balance method,based on the superposition principle of complex potential,the reservoir in the infinite formation is transformed into a single point analysis,which can avoid the influence of the heterogeneity in the lithologic structure reservoir.The calculated water size is 156 times,and the maximum water invasion rate is 3500 m3/day,and the calculated results are more accurate.The research results can realize the quantitative judgment of natural energy and reservoir internal connectivity at the early stage of development,guide the injection timing of new oil fields,and provide a basis for rolling development of old oil fields and fine injection of oil reservoirs.

关 键 词：天然能量 物质平衡方程 复势叠加 

分 类 号：TE345[石油与天然气工程—油气田开发工程]