摘要
火驱存在原油低温氧化和高温氧化2种燃烧状态,针对低温氧化过程不稳定、热效率低、采出程度低等问题,以杜66块火驱为研究对象,开展了室内物理模拟和数值模拟实验,通过耗氧量及不同组分尾气数据的历史拟合,建立了火驱反应动力学模型,构建了基于火驱前缘初始温度、通风强度的高温与低温氧化转换界限图版。研究表明:高温氧化下,杜66块原油视H/C原子比为0.5~2.0,CO/CO_(2)体积比为0.13~0.40;低温氧化过程燃烧不稳定,易熄灭;杜66块火驱高温与低温氧化的临界前缘初始温度和通风强度分别为280℃、1.0 m^(3)/(m^(2)·h),低于或接近临界值将面临转入低温氧化甚至熄火风险;基于杜66块火驱提出了维持最低通风强度、分层火驱等开发对策。该研究为火驱油藏工程设计提供了理论依据。
There are two combustion states of in-situ combustion,namely low-temperature and high-temperature oxidation of crude oil.To address the problems of unstable low-temperature oxidation process,low thermal efficiency and low recovery percent,indoor physical simulation and numerical simulation experiment were carried out with the in-situ combustion in Du 66 Block as the study object,a kinetic model of in-situ combustion reaction was established through the historical fitting of oxygen consumption and different-component exhaust gas data,and a transform boundary chart of high-and low-temperature oxidation was constructed based on the initial temperature and ventilation intensity at the front edge of the in-situ combustion.The results of the study showed that in high-temperature oxidation,the apparent H/C atomic ratio of crude oil in Du 66 Block was 0.5 to 2.0 and the CO/CO_(2) volume ratio was 0.13 to 0.40;the combustion during low-temperature oxidation was unstable and easily extinguished;the initial temperature and ventilation intensity at the critical front edge of high-and low-temperature oxidation of in-situ combustion in Du 66 Block were 280°C and 1.0 m^(3)/(m^(2)·h)respectively;if lower than or close to the critical value,there may be a risk of low-temperature oxidation or even extinction;development countermeasures were put forward based on in-situ combustion in Du 66 Block,including maintaining the minimum ventilation intensity and stratified in-situ combustion.The study provides a theoretical basis for the engineering design of in-situ combustion reservoirs.
作者
户昶昊
Hu Changhao(PetroChina Liaohe Oilfield Company,Panjin,Liaoning 124010,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2021年第5期86-92,共7页
Special Oil & Gas Reservoirs
基金
国家科技重大专项“辽河、新疆稠油/超稠油开发技术示范工程”(2016ZX05055)。
关键词
火驱
数值模拟
高温氧化
低温氧化
技术界限
杜66块
in-situ combustion
numerical simulation
high-temperature oxidation
low-temperature oxidation
technological limit
Du 66 Block
