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

作　　者：金贤镐[1] 何金钢[1] 万建荣 郭军辉[2] 刘笑莹 JIN Xian’gao;HE Jin’gang;WAN Jianrong;GUO Junhui;LIU Xiaoying(No.1 Oil Production Company of PetroChina Daqing Oilfield Co.,Ltd.,Daqing 163001,China;Explora-tion and Development Research Institute of PetroChina Daqing Oilfield Co.,Ltd.,Daqing 163712,China)

机构地区：[1]中国石油大庆油田有限责任公司第一采油厂,黑龙江大庆163001 [2]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2025年第2期58-67,共10页Petroleum Geology & Oilfield Development in Daqing

基　　金：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);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);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”。

摘　　要：为了研究大庆油田萨中开发区特高含水后期生产气油比在正地饱压差条件下仍急剧上升且远高于原始溶解气油比的现象,利用油/气/水高压物性室内实验研究了溶解气油比和溶解气水比的影响因素,开展了单油层开发生产气油比全生命周期评价矿场试验,通过增加“溶解气水比”参数修正了生产气油比的理论计算公式,利用修正后的理论生产气油比曲线分析并解释了生产气油比在水驱特高含水后期大幅上升和化学驱阶段大幅波动的主要原因,并开展了萨中开发区生产气油比变化趋势评价等研究。结果表明:注入水或聚合物溶液能够从饱和气体的原油中获取部分溶解气,实验测得萨中开发区的溶解气水比达到1.952~2.138cm^(3)/g;在单油层开发矿场试验阶段,正地饱压差下生产气油比仍随综合含水率的升高而增大,且在化学驱过程中也表现出了相同的变化规律;在实际生产气油比计算时需要考虑油和水中溶解气的共同影响,通过溶解气油比和溶解气水比建立生产气油比与综合含水率之间的关系,即对生产气油比的理论公式进行修正。因此,在特高含水后期生产气油比的分析过程中,需要充分考虑水中的溶解气的影响,才能对开发形势作出更准确的判断。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 cm^(3)/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 

分 类 号：TE341[石油与天然气工程—油气田开发工程]