高温高压条件下CO2 / 原油和N2 / 原油的界面张力

doi:10.7623/syxb201101031

石油学报 ›› 2011, Vol. 32 ›› Issue (1): 177-180.DOI: 10.7623/syxb201101031

高温高压条件下CO₂/ 原油和N₂/ 原油的界面张力

王海涛伦增珉骆铭赵志峰

中国石油化工股份有限公司石油勘探开发研究院北京 100083

收稿日期:2010-05-04 修回日期:2010-08-25 出版日期:2011-01-25 发布日期:2011-03-23
通讯作者: 王海涛
作者简介:王海涛，男，1982年10月生，2008年毕业于中国石油大学（北京）化学工艺专业，现为中国石化石油勘探开发研究院助理工程师，主要从事提高采收率研究。
基金资助:
国家高技术研究发展计划（863）项目（2009AA063406）和中国石油化工股份有限公司科技开发项目(P10043)联合资助。

Interfacial tension of CO₂/ crude oil and N₂/ crude oil at high pressure and high temperature

WANG Haitao LUN Zengmin LUO Ming ZHAO Zhifeng

Received:2010-05-04 Revised:2010-08-25 Online:2011-01-25 Published:2011-03-23

摘要/Abstract

摘要：

在油藏温度下，采用ADSA（axisymmetric drop shape analysis）技术测定了不同压力下CO₂/原油和N₂/原油体系的平衡界面张力。实验发现，原油与超临界CO₂接触的初始阶段存在强烈的扩散作用，原油中的轻质组分被超临界CO₂溶解抽提，并且随着压力的增加，这种溶解抽提作用增强；原油与N₂接触时，也存在相互扩散作用，但在本实验所测试的压力范围内（小于36 MPa）并不明显。两种体系的平衡界面张力随着压力的升高逐渐降低，其中CO₂/原油体系的平衡界面张力降低的幅度明显大于N₂/原油体系；N₂/原油体系的平衡界面张力随压力基本呈线性变化。在CO₂/原油体系中，当压力低于17.7MPa时，平衡界面张力下降非常快；当压力大于17. MPa时，CO₂/原油体系的平衡界面张力下降较慢。

关键词: 轴对称滴形分析, 界面张力, 超临界CO_2, 原油体系, 扩散

Abstract:

In the condition of the stratum temperature,ADSA (axisymmetric drop shape analysis) has been utilized to investigate the equilibrium interfacial tension of CO₂/ crude oil and N₂/ crude oil systems under different pressures.It turns out that crude oil and supercritical CO₂ had intense mutual diffusion in the initial stage of their mixing.The light components of crude oil were extracted by supercritical CO₂.And the higher the pressure was,the stronger the extraction was.Crude oil and N₂ also had the diffusion but not obvious within the pressure range (less than 36MPa) in this experiment.The test results indicated that the equilibrium interfacial tension of two systems decreased as the systematic pressure increased.In addition,the equilibrium interfacial tension values of CO₂/ crude oil decreased more than N₂/ crude oil system.The relation between equilibrium interfacial tension and pressure was approximately linear in N₂/crude oil system; while in CO₂/ crude oil system,the equilibrium interfacial tension decreased sharply with the pressure less than 17.7 MPa,and the equilibrium interfacial tension only decreased appreciably with pressure over 17.7 MPa.

Key words: Axisymmetric Drop Shape Analysis(ADSA), interfacial tension, supercritical CO₂, crude oil systems, diffusion

王海涛伦增珉骆铭赵志峰. 高温高压条件下CO₂/ 原油和N₂/ 原油的界面张力[J]. 石油学报, 2011, 32(1): 177-180.

WANG Haitao LUN Zengmin LUO Ming ZHAO Zhifeng. Interfacial tension of CO₂/ crude oil and N₂/ crude oil at high pressure and high temperature[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(1): 177-180.

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高温高压条件下CO₂/ 原油和N₂/ 原油的界面张力

Interfacial tension of CO₂/ crude oil and N₂/ crude oil at high pressure and high temperature

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