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/CO2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 m3/(m2·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/CO2 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 m3/(m2·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.
[1] FASSIHI M R,METERS K O,BASLIE P F.Low-temperature oxidation of viscous crude oils[J].SPE Reservoir Engineering,1990,5(4):609-616.
[2] 程月,张悫,袁鉴,等.低温氧化对原油组成的影响[J].化学研究,2007,18(1):67-69.
CHENG Yue,ZHANG Que,YUAN Jian,et al.Effect of low temperature oxidation on the composition of crude oil[J].Chemical Research,2007,18(1):67-69.
[3] 张锐,邓君宇,任韶然,等.稠油低温氧化过程结焦行为实验[J].中国石油大学学报(自然科学版),2015,39(4):119-125.
ZHANG Rui,DENG Junyu,REN Shaoran,et al.Experimental study on coking behavior of heavy oils in low temperature oxidation process[J].Journal of China University of Petroleum(Edition of Natural Science),2015,39(4):119-125.
[4] OSMAN E A,AGGOUR M A,ABU-KHAMSIN S A.In-situ sand consolidation by low-temperature oxidation[J].SPE Production & Operations,2000,15(1):42-49.
[5] 任韶然,杨昌华,侯胜明,等.注气体积和轻质油藏空气驱机制的关系探讨[J].中国石油大学学报(自然科学版),2012,36(3):121-125.
REN Shaoran,YANG Changhua,HOU Shengming,et al.Relationship between air volume and oil-recovery mechanism for light oil air injection process[J].Journal of China University of Petroleum(Edition of Natural Science),2012,36(3):121-125.
[6] 郭平,汪艳,杜建芬,等.轻质油藏注空气燃烧管试验[J].中国石油大学学报(自然科学版),2008,32(1):60-63,71.
GUO Ping,WANG Yan,DU Jianfen,et al.Combustion-tube test of air injection for light-oil reservoir[J].Journal of China University of Petroleum(Edition of Natural Science),2008,32(1):60-63,71.
[7] CLARA C,DURANDEAU M,QUENAULT G,et al.Laboratory studies for light-oil air injection projects:potential application in dandil field[J].SPE Reservoir Evaluation & Engineering,2000,3(3):239-248.
[8] NODWELL J,MOORE R G,URSENBACH M G,et al.Economic considerations for the design of in-situ combustion projects[J].Journal of Canadian Petroleum Technology,2000,39(8):34-41.
[9] JIA H,ZHAO J Z,PU W F,et al.Thermal study on light crude oil for application of high-pressure air injection (HPAI) process by TG/DTG and DTA tests[J].Energy & Fuels,2012,26(3/4):1575-1584.
[10] 唐君实,关文龙,梁金中,等.热重分析仪求取稠油高温氧化动力学参数[J].石油学报,2013,34(4):775-779.
TANG Junshi,GUAN Wenlong,LIANG Jinzhong,et al.Determination on high-temperature oxidation kinetic parameters of heavy oils with thermogravimetric analyzer[J].Acta Petrolei Sinica,2013,34(4):775-779.
[11] 唐君实,关文龙,蒋有伟,等.稀油火烧油层物理模拟[J].石油学报,2015,36(9):1135-1140.
TANG Junshi,GUAN Wenlong,JIANG Youwei,et al.Physical simulation of light oil in-situ combustion[J].Acta Petrolei Sinica,2015,36(9):1135-1140.
[12] CINAR M,CASTANIER L,KOVSEEK A R.Improved analysis of the kinetics of crude-oil in-situ combustion[C].SPE113948,2008:1-20.
[13] MOHAMMAD B.Measurement of in-situ combustion reaction kinetics with high fidelity and consistent reaction upscaling for reservoir simulation[D].California:Stanford University,2014.
辽公网安备 21110002000031号 辽ICP备18011648号-1
