摘要
稠油氧化特性研究是火驱提高采收率矿场设计的依据和基础,但截至目前,有关压力对稠油高压火驱的研究相对较少。为了明确压力对稠油火驱氧化特性的影响,并有效减少高压火驱的不利影响,以鲁克沁稠油为例,基于热重实验和差示扫描量热实验,研究不同压力下的稠油氧化热失重以及放热等变化特性,首先计算不同压力下的动力学参数,得出各氧化阶段的活化能、反应焓;其次,通过燃烧管实验,评价了不同压力下的火驱燃烧效果及稳定性。研究结果表明:压力升高加快了稠油氧化反应速率,增加了放热量,复杂体系的氧化路径有所改变,反应动力学表征参数需进行高压修正;并且压力升高使火线推进速率加快,燃烧前缘温度较常压火驱升高300℃以上,燃烧稳定性变差;10%减氧高压火驱燃烧稳定,有效抑制高压反应速度过快导致的燃烧不稳定性。
A study on oxidation characteristics of heavy oil is the basis of mine design of improving oil recovery by in-si-tu combustion.However,there are relatively few studies on the effect of pressure on high-pressure in-situ combustion of heavy oil reservoirs.In order to clarify the influence of pressure on oxidation characteristics of heavy oil reservoirs by in-situ combustion and effectively reduce the adverse effects of high-pressure in-situ combustion,this paper took Lukeqin heavy oil reservoirs as an example and investigated the thermal weight loss,heat release,and other oxidation character-istics of heavy oil reservoirs under different pressures based on thermogravimetric and differential scanning calorimetry experiments.The paper first calculated the kinetic parameters under different pressures and obtained the activation ener-gy and reaction enthalpy at each oxidation stage.Secondly,the combustion effect and stability of in-situ combustion un-der varied pressures were evaluated through the combustion tube experiments.The experimental results show that higher pressures accelerate the oxidation reaction rates of heavy oil and intensify heat release.The oxidation paths of complex systems are changed,and the characterization parameters of reaction kinetics need to be modified under high pressures.In addition,the advancing speeds of the in-situ combustion line under high pressures are accelerated,and the tempera-tures of the burning fronts are more than 300°C higher than those of atmospheric-pressure in-situ combustion;the com-bustion stability becomes worse,and the combustion under high-pressure in-situ combustion with oxygen reduced by 10%is stable,which effectively suppresses the combustion instability caused by fast high-pressure reaction speeds.
作者
赵健
张娜
蒋海岩
赵志龙
焦平格
ZHAO Jian;ZHANG Na;JIANG Haiyan;ZHAO Zhilong;JIAO Pingge(Research Institute of Exploration and Development,Tyha Oifield Company,PetroChina,Hami,Xinjiang,839009,China;College of Petroleum Engineering,Xi'an Shiyou Universit,Xi'an City,Shanxi Province,710065,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2023年第3期145-151,共7页
Petroleum Geology and Recovery Efficiency
基金
国家自然科学基金项目“基于热-流-固-化多场耦合的火驱储层热次生孔道演化及盐沉析调控机理研究”(52274039)
陕西省自然科学基础研究重点项目“基于多点微波加热的油页岩原位热解开采方法研究”(2022JZ-28)。
关键词
深层稠油
高压火驱
氧化特性
高压动力学表征
热分析实验
高压燃烧管实验
减氧火驱
deep heavy oil reservoir
high-pressure in-situ combustion
oxidation characteristics
high-pressure kinetic characterization
thermal analysis experiment
high-pressure combustion tube experiment
oxygen reduction in-situ combustion
作者简介
赵健(1969-),男,陕西铜川人,教授级高级工程师,博士,从事油气田开发与提高采收率研究。E-mail:windly99999@163.com。
