致密油藏气驱化学分析及提高采收率实验研究  

Chemical analysis of gas flooding in tight oil reservoirs and experimental study on enhanced oil recovery

作　　者：刘玉栋 马志立 秦如 张晓彤 LIU Yu-dong;MA Zhi-li;QIN Ru;ZHANG Xiao-tong(Changqing Oilfield Branch Sixth Oil Production Plant,Yulin 719000,China)

机构地区：[1]长庆油田分公司第六采油厂,陕西榆林719000

出　　处：《化学工程师》2025年第3期51-55,共5页Chemical Engineer

基　　金：国家自然科学基金(52104032):致密砂岩油藏低频波动激励纳米表面活性剂渗吸排驱协同增效机理研究。

摘　　要：本文采用CO_(2)驱油体系结合化学添加剂的研究方法,通过实验室模拟分析了表面活性剂与聚合物在不同浓度和组合条件下的协同作用。实验在20MPa压力、60℃温度下进行,评估了注气速率和添加剂比例对采收率的影响。研究结果显示,2wt%表面活性剂与0.5wt%聚合物组合可将采收率提高至76.5%,显著高于单一表面活性剂的63.9%。在温度升高至80℃时,最高采收率达65.8%,进一步验证了高温对驱油效率的促进作用。此外,实验表明,在注气速率为2.0m L·min^(-1)的情况下,采收率达到64.5%,而间歇注气在1.5m L·min^(-1)下也表现出稳定的效果(62.9%)。This article adopts the research method of CO_(2)flooding system combined with chemical additives,and analyzes the synergistic effect of surfactant and polymer under different concentrations and combination conditions through laboratory simulation.The experiment was conducted at a pressure of 20MPa and a temperature of 60℃,and the effects of gas injection rate and additive ratio on oil recovery were evaluated.Research results show that the combination of 2wt%surfactant and 0.5wt%polymer can increase the recovery rate to 76.5%,which is significantly higher than the 63.9%of a single surfactant.When the temperature increased to 80℃,the maximum recovery rate reached 65.8%,further verifying the promotion effect of high temperature on oil displacement efficiency.In addition,experiments show that when the gas injection rate is 2.0mL·min^(-1),the recovery rate reaches 64.5%,while intermittent gas injection also shows a stable effect(62.9%)at 1.5mL·min^(-1).

关 键 词：致密油藏 二氧化碳气驱 采收率 影响因素 

分 类 号：TE327[石油与天然气工程—油气田开发工程]