大庆石油地质与开发2025，Vol.44Issue(2)：58-67,10.DOI:10.19597/J.ISSN.1000-3754.202402012
大庆油田萨中开发区特高含水后期生产气油比变化规律
Variation law of produced gas-oil ratio in late stage of ultra-high water cut in Sazhong development zone of Daqing Oilfield
摘要
Abstract
In order to study the phenomenon that produced gas-oil ratio in late stage of ultra-high water cut in Sa-zhong development zone of Daqing Oilfield still increases sharply and is much higher than original dissolved gas-oil ratio in condition of positive formation-saturation pressure difference,influencing factors of dissolved gas-oil ratio and dissolved gas-water ratio are studied by laboratory experiment of high-pressure properties of oil/gas/water,and field test is carried out for whole-life cycle evaluation of produced gas-oil ratio in single-layer development.Theoreti-cal calculation formula of produced gas-oil ratio is modified by adding parameters of"dissolved gas-water ratio".Modified theoretical produced gas-oil ratio curve is used to analyze and explain the main reasons for significant in-crease of produced gas-oil ratio of water flooding in late stage of ultra-high water cut and significant fluctuation in chemical flooding stage,and variation trend of produced gas-oil ratio in Sazhong development zone is evaluated.The results show that injected water or polymer solution can obtain partial dissolved gas from oil saturated with gas,and measured dissolved gas-water ratio in experiment reaches 1.952～2.138 cm3/g.In field test stage of single-layer development,produced gas-oil ratio still increases with the increase of comprehensive water cut in condition of posi-tive formation-saturation pressure difference,and shows same variation law in chemical flooding process.Combined influence of dissolved gas in oil and water should be considered in calculating actual produced gas-oil ratio.Theoret-ical formula of produced gas-oil ratio is modified by establishing relationship between produced gas-oil ratio and comprehensive water cut through dissolved gas-oil ratio and dissolved gas-water ratio.Therefore,influence of dis-solved gas in water should be fully considered in analysis of produced gas-oil ratio in late stage of ultra-high water cut,so as to make more accurate determination on development situation.关键词
油田开发/特高含水后期/生产气油比/压力/含水率Key words
oil field development/late stage of ultra-high water cut/produced gas-oil ratio/pressure/water cut分类
石油、天然气工程引用本文复制引用
金贤镐,何金钢,万建荣,郭军辉,刘笑莹..大庆油田萨中开发区特高含水后期生产气油比变化规律[J].大庆石油地质与开发,2025,44(2):58-67,10.基金项目
中国石油天然气股份有限公司重大科技专项"老油田'压舱石工程'关键技术研究与示范"(2023YQX102) （2023YQX102）
中国石油天然气股份有限公司攻关性应用性科技专项"中高渗油田特高含水期大幅度提高采收率技术研究"(2023ZZ22) （2023ZZ22）
大庆市"新雁"人才团队计划项目"特高含水老油田提高采收率新技术研用一体化攻关". （）
