摘要
选取青海油田尕斯库勒古近系下干柴沟组下段油藏轻质原油,开展了热动力学分析实验并计算了原油氧化的活化能;通过原油静态氧化实验模拟了多孔介质中原油的氧化过程,通过傅立叶变换离子回旋共振质谱与气相色谱联用对比了原油低温氧化前后的组分变化;将减氧空气动态驱替实验与核磁共振技术相结合,分析了减氧空气驱原油动用程度。原油氧化全过程可划分为轻烃挥发、低温氧化、燃料沉积与高温氧化4个阶段,高温氧化阶段所需活化能最大,燃料沉积段所需活化能次之,低温氧化段所需活化能最低;参与反应气体中的氧浓度与反应所需活化能呈负相关,氧浓度越高,氧化反应所需平均活化能越低;原油与含氧空气发生低温氧化反应,在产生大量热能的同时,还生成部分CO、CO_(2)、CH_(4)气体,在储集层内形成烟道气驱,具有一定的混相、降黏、降低界面张力、促进原油膨胀的作用,有助于提高采收率;在油藏温度合适的情况下,对所有尺度的孔喉区间而言,减氧空气驱的采出程度均比氮气驱高,应优先选用空气/减氧空气驱开发方式。
Light crude oil from the lower member of the Paleogene Lower Ganchaigou Formation of Gaskule in Qinghai oilfield was selected to carry out thermal kinetic analysis experiments and calculate the activation energy during the oil oxidation process.The oxidation process of crude oil in porous medium was modeled by crude oil static oxidation experiment,and the component changes of crude oil before and after low temperature oxidation were compared through Fourier transform ion cyclotron resonance mass spectrometry and gas chromatography;the dynamic displacement experiment of oxygen-reduced air was combined with NMR technology to analyze the oil recovery degree of oxygen-reduced air flooding.The whole process of crude oil oxidation can be divided into four stages:light hydrocarbon volatilization,low temperature oxidation,fuel deposition,and high temperature oxidation;the high temperature oxidation stage needs the highest activation energy,followed by the fuel deposition stage,and the low temperature oxidation stage needs the lowest activation energy;the concentration of oxygen in the reaction is negatively correlated with the activation energy required for the reaction;the higher the oxygen concentration,the lower the average activation energy required for oxidation reaction is;the low-temperature oxidation reaction between crude oil and air generates a large amount of heat and CO,CO_(2) and CH_(4),forming flue gas drive in the reservoir,which has certain effects of mixing phases,reducing viscosity,lowering interfacial tension and promoting expansion of crude oil,and thus helps enhance the oil recovery rate.Under suitable reservoir temperature condition,the degree of recovery of oxygen-reduced air flooding is higher than that of nitrogen flooding for all scales of pore throat,and the air/oxygen-reduced air flooding development should be preferred.
作者
齐桓
李宜强
陈小龙
龙安林
魏莉
李杰
罗江浩
孙雪彬
汤翔
管错
QI Huan;LI Yiqiang;CHEN Xiaolong;LONG Anlin;WEI Li;LI Jie;LUO Jianghao;SUN Xuebin;TANG Xiang;GUAN Cuo(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Petroleum Engineering Institute,China University of Petroleum(Beijing),Beijing 102249,China;Exploration and Development Research Institute,PetroChina Qinghai Oilfield Company,Dunhuang 736200,China;State Key Laboratory of Offshore Oil Exploitation,Beijing 100028,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2021年第6期1210-1217,共8页
Petroleum Exploration and Development
关键词
轻质原油
减氧空气驱
低温氧化反应
热动力学特征
提高采收率
light crude oil
oxygen-reduced air flooding
low-temperature oxidation
thermal kinetics characteristics
enhanced oil recovery
