海上边水驱砂岩油田合理油水井数比计算方法  

Calculation method for reasonable oil-water well ratio in the edge water drive offshore sandstone oilfield

作　　者：陈肖 缪云 李伟 谢明英 施浩 王伟峰 CHEN Xiao;MIAO Yun;LIWei;XIE Mingying;SHI Hao;WANGWeifeng(Shenzhen Branch of CNOOC Limited,Shenzhen 518054,Guangdong,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518054

出　　处：《岩性油气藏》2025年第1期194-200,共7页Lithologic Reservoirs

基　　金：中国海洋石油集团有限公司“十四五”重大项目“海上油田大幅度提高采收率关键技术”(编号:KJGG2021-0503);中国海洋石油集团有限公司综合科研项目“海上不同类型油田开发效果分级体系研究与应用”(编号:KJZH-2023-2205)联合资助。

摘　　要：基于物质平衡和极值原理,推导考虑边水能量影响下的合理油水井数比与合理地层压力的计算公式,并结合珠江口盆地新近系珠江组A油藏开发实践,对边水油藏合理油水井数比随含水率的变化规律进行详细研究。研究结果表明:①在计算不同含水率阶段的合理油水井数比时,相较于传统计算方法,考虑边水能量影响的计算结果更接近矿场实践。②合理油水井数比受制于多种因素的综合影响,其中边水水侵系数对其影响最为显著,且水侵系数越大,不考虑水侵因素方法的计算误差越大。③为达到高产液量和天然能量高利用率,通过计算得到珠江口盆地A油藏现阶段合理油水井数比为1.97,该条件下,日注水量为18878 m^(3),天然水侵量为1693 m^(3)/d,地层压力为21.27 MPa,与数值模拟结果相近。Based on the calculation formulas for reasonable oil-water well ratio and reasonable formation pressure in oil fields considering the influence of edge water energy were derived through material balance and extreme value principles.This method was applied to reservoir A,which is developed in Neogene the Pearl River Formation of the Pearl River Mouth Basin.Meanwhile,the variation law of reasonable oil-water well ratio with water content in edge water reservoirs has been analyzed through the new method.The results show that:(1)Compare with natural energy supplementation,the new method can determine the reasonable oil-water well ratio for different water content stages of edge water reservoirs and the calculation results are closer to field practice.(2)The reasonable ratio of oil-water wells is subject to the comprehensive influence of multiple factors.The coefficient of edge water invasion has the most significant impact on it.The larger water invasion coefficient,the greater the calculation error of traditional methods.(3)To meet the conditions of high liquid yield and high utilization of natural energy,the current reasonable oil-water well ratio was 1.97 for reservoir A of the Pearl River Mouth Basin.Under this condition,the daily water injection volume was 18878 m^(3)/d.The natural water influx was 1693 m^(3)/d.The formation pressure was 21.27 MPa.The calculation results were similar to the numerical simulation results.

关 键 词：边水驱油藏 物质平衡 合理油水井数比 合理地层压力 注采比 水侵系数 数值模拟 新近系 珠江口盆地 

分 类 号：TE341[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]