新疆石油地质

新疆石油地质 ›› 2024, Vol. 45 ›› Issue (2): 221-227.doi: 10.7657/XJPG20240211

• 油藏工程 • 上一篇    下一篇

CO2对稠油油藏的物性调控及辅助蒸汽驱提高采收率

魏鸿坤1(), 王健1(), 许天寒1, 路宇豪1, 周娅芹1, 王俊衡2   

  1. 1.西南石油大学 油气藏地质及开发工程国家重点实验室，成都 610500
    2.中国石油 长庆油田分公司 第一采油厂，陕西 延安 716000
  • 收稿日期:2023-09-19 修回日期:2023-11-16 出版日期:2024-04-01 发布日期:2024-03-26
  • 通讯作者: 王健（1966-），男，江苏如皋人，教授，博士，提高采收率，（Tel）13981896676（Email）404674469@qq.com
  • 作者简介:魏鸿坤（1998-），男，四川泸州人，硕士研究生，提高采收率，（Tel）18982413798（Email）1183885157@qq.com
  • 基金资助:
    国家自然科学基金(52174035)

Regulation of CO2 on Physical Properties of Heavy Oil Reservoir and EOR of CO2-Assisted Steam Flooding

WEI Hongkun1(), WANG Jian1(), XU Tianhan1, LU Yuhao1, ZHOU Yaqin1, WANG Junheng2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University,Chengdu, Sichuan 610500, China
    2. No.1 Oil Production Plant, Changqing Oilfield Company, PetroChina, Yan’an, Shaanxi 716000, China
  • Received:2023-09-19 Revised:2023-11-16 Online:2024-04-01 Published:2024-03-26

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摘要：

为提高稠油油藏蒸汽驱后期开发效率，聚焦“双碳”背景下CCUS-EOR（碳捕集利用和封存体系提高采收率）技术的应用，以克拉玛依油田J6区为研究对象，通过对CO2作用前后的稠油四组分分析，测试饱和压力、膨胀系数、黏度和密度变化情况，探究CO2对稠油物性的调控效果；通过并联岩心物理模拟实验研究CO2辅助蒸汽驱提高采收率效果。研究结果表明：稠油黏度主要受胶质和沥青质含量影响，稠油随着CO2溶解气量的增加，饱和压力由2.08 MPa上升至11.11 MPa，膨胀系数总体呈上升趋势，上升7.6%；同时，黏度降低30.5%，密度减小3.5%。表明CO2在提高饱和压力的同时，通过优化膨胀系数、黏度和密度，有效改善了稠油物性。此外，采用CO2辅助蒸汽驱后，在CO2溶解降黏、破乳的作用下，稠油采收率从38.55%提高至46.46%，相比纯蒸汽驱提高了7.91%。为CO2辅助蒸汽驱提高稠油采收率的应用提供了理论和实验基础，可为同类型稠油油藏提高采收率提供借鉴。

关键词: 克拉玛依油田J6区, 稠油油藏, CO2, 蒸汽驱, 提高采收率, 物性调控, 四组分分析, 物理模拟

Abstract:

It is necessary to improve development efficiency of heavy oil reservoirs in the late stage of steam flooding. In this paper, considering the application of the technology of carbon capture, utilization and storage, and enhanced oil recovery （CCUS-EOR）, and taking the J6 block of Karamay oilfield as an example, four components of heavy oil were analyzed before and after CO2 treatment, and the changes in saturation pressure, expansion coefficient, viscosity, and density were tested to investigate the regulation of CO2 on physical properties of heavy oil. Parallel core physical simulation experiments were performed to understand the performance of CO2-assisted steam flooding in improving oil recovery. The results show that the viscosity of heavy oil is mainly affected by the contents of resin and asphaltene. As the volume of CO2 dissolved in heavy oil increases, the saturation pressure rises from 2.08 MPa to 11.11 MPa, and the expansion coefficient shows an upward trend, with an increase of 7.6%; meanwhile, the viscosity and density of the heavy oil decrease by 30.5% and 3.5%, respectively. This indicates that CO2 can effectively improve the physical properties of heavy oil by optimizing the expansion coefficient, viscosity, and density while increasing the saturation pressure. In addition, the application of CO2-assisted steam flooding enables the recovery of heavy oil to increase from 38.55% to 46.46% under the effect of CO2 dissolution for viscosity reduction and demulsification, representing an increase of 7.91% compared to pure steam flooding. This study provides a theoretical and experimental basis for the application of CO2-assisted steam flooding in enhancing the recovery of heavy oil, offering insights for similar heavy oil reservoirs.

Key words: J6 block of Karamay oilfield, heavy oil reservoir, CO2, steam flooding, enhanced oil recovery, regulation of physical property, four-component analysis, physical simulation

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