低温CO2驱替含沥青质原油模型化研究
Numerical Simulation of Asphaltic Crude Oil Dynamic Injected by Low Temperature Carbon Dioxide
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- 引用格式:
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贾英,黄磊,孙雷,石志良.低温CO2驱替含沥青质原油模型化研究[J].天然气与石油,2011,29(4):0.doi:
.Numerical Simulation of Asphaltic Crude Oil Dynamic Injected by Low Temperature Carbon Dioxide[J].Natural Gas and Oil,2011,29(4):0.doi:
- DOI:
- 作者:
- 贾 英1 黄 磊2 孙 雷3 石志良1
- 作者单位:
- 1.中国石化勘探开发研究院，2.中国石油勘探开发科学研究院，3.西南石油大学油气藏地质及开发工程国家重点实验室
- 关键词:
- 沥青质；注CO2；数值模拟；温度变化
Asphaltene；CO2 injection；Numerical simulation；Temperature change
- 摘要:
- 为进一步了解CO2注入过程中含沥青质原油在注气井近井地带中的渗流规律和温度变化对沥青质沉淀的影响，在前人研究的基础上，综合考虑沥青质的沉积、能量的转化及CO2温度的变化，建立了注CO2含沥青质原油数值模型。以某实例油田为例，将该模型应用于注气井近井地带模拟，结果表明：低温CO2驱油过程存在液相驱替，并随注气压力的增大，温度的影响范围不断扩大；沥青质沉积主要发生在近井地带；低温CO2引发的沥青质沉淀比模拟的常温CO2引发的沥青质沉淀小。在模型计算过程中，将低温CO2驱油效率分两方面讨论，作出四类基本低温驱油机理图，认识到合理的注入参数选取是关键。
In order to further understand effects of fluid penetration regularity and temperature change around CO2 injector on asphaltene deposition during CO2 injection，analyzed comprehensively are asphaltene deposition，energy transformation and CO2 temperature change and established is a numerical model during CO2 injection according to historical data. Applied is the numerical model in certain injector and the research results show that liquid flooding exists in low temperature driving，temperature influence range is extended along with the increase of gas injection pressure，higher accumulation of deposited asphaltene is shown mainly around immediate vicinity of wellbore；precipitated asphaltene triggered by low temperature CO2 injection is less than that calculated by simulative model of normal temperature CO2 injection. Discussed are two aspects of low temperature CO2 driving efficiency during model calculation，drawn are four kinds of basic low temperature CO2 displacement schematics and it has been realized that it is critical to select injection parameters properly for low temperature carbon dioxide flooding.
