低渗透油田气驱技术对采收率提升的影响分析  

Analysis on the impact of gas flooding technology on recovery improvement in low permeability oil fields*

作　　者：马志立 闫小勇 王珍 秦森强 MA Zhi-li;YAN Xiao-yong;WANG Zhen;QIN Sen-qiang(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4期60-64,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：基于提高低渗透油田采收率的目的,本文采用高压岩芯流动装置,通过实验分析不同气体种类(CO_(2)、N_(2)、甲烷)、注气速率及温度和压力等条件对驱油效果的影响,并结合CO_(2)气驱、水驱及化学复合驱的对比研究和协同效应实验,得到以下结论:CO_(2)气驱在提升采收率方面表现最佳,最高采收率达到52.7%,显著优于水驱的38.9%;最佳注气速率为0.5mL·min^(-1),使采收率提高了23.5%;在温度和压力的综合条件下,60℃和10MPa时采收率达到54.1%,表现出最优效果。CO_(2)与化学复合驱结合使用进一步提升采收率至61.9%,表现出很好的协同效应。现场试验结果表明,CO_(2)气驱技术可使采收率提升28.3%~32.1%,日产油量提高至15.4~17.1t,气体利用率维持在85.7%~87.2%之间。Based on the purpose of improving the recovery rate of low-permeability oil fields,this paper uses a high-pressure core flow device to experimentally analyze the impact of different gas types(CO_(2),N_(2),methane),gas injection rate,temperature,pressure and other conditions on the oil displacement effect,and combines comparative studies and synergistic effect tests between CO_(2) gas flooding,water flooding and chemical composite flooding have led to the following conclusions:CO_(2) gas flooding performs best in improving recovery,with a maximum recovery rate of 52.7%,which is significantly better than water flooding 38.9%;the optimal gas injection rate is 0.5mL·min^(-1),which increases the recovery rate by 23.5%;under the comprehensive conditions of temperature and pressure,the recovery rate reaches 54.1%at 60℃and 10MPa,showing the optimal effect.The combination of CO_(2) and chemical composite flooding further increased the recovery rate to 61.9%,demonstrating a synergistic effect.Field test results show that CO_(2) gas flooding technology can increase the recovery rate by 28.3%~32.1%,increase the daily oil production to 15.4~17.1t,and maintain the gas utilization rate between 85.7%~87.2%.

关 键 词：低渗透油田 气驱技术 二氧化碳 采收率 影响因素 现场应用 

分 类 号：TE327[石油与天然气工程—油气田开发工程]