Dominant mechanism and application of CO<sub>2</sub> immiscible flooding in M block with low permeability

JIN Zhongkang; WANG Zhilin; MAO Chaoqi

doi:10.13809/j.cnki.cn32-1825/te.2020.03.010

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Dominant mechanism and application of CO₂ immiscible flooding in M block with low permeability

更新时间：2025-12-11

- Dominant mechanism and application of CO₂ immiscible flooding in M block with low permeability
- Petroleum Reservoir Evaluation and Development Vol. 10, Issue 3, Pages: 68-74(2020)
- 作者机构：
  
  1. 中国石化江苏油田分公司采油二厂,江苏金湖,211600
  2. 中国石化江苏油田分公司勘探开发研究院,江苏,扬州,225009
  3. 中国石化江苏油田分公司勘探开发研究院,江苏,扬州,225009
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2020.03.010
  CLC： TE345
- Published：2020
- 稿件说明：
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JIN Zhongkang, WANG Zhilin, MAO Chaoqi. Dominant mechanism and application of CO₂ immiscible flooding in M block with low permeability[J]. Petroleum Reservoir Evaluation and Development, 2020, 10(3): 68-74.
DOI：

JIN Zhongkang, WANG Zhilin, MAO Chaoqi. Dominant mechanism and application of CO₂ immiscible flooding in M block with low permeability[J]. Petroleum Reservoir Evaluation and Development, 2020, 10(3): 68-74. DOI： 10.13809/j.cnki.cn32-1825/te.2020.03.010.

摘要

对具有非均质性强

原油混相压力高

储层亏空严重等特点的低渗油藏

非混相驱是重要的提高采收率技术。首先通过室内试验开展了原油注CO

膨胀实验

并测定了CO

-原油最小混相压力

然后应用数值模拟分别研究了非混相驱界面张力及油气组分沿程分布的动态变化

进而从恢复储层能量和提高驱油效率两个角度揭示了CO

非混相驱的主控机理

最后以低渗岩性M油藏为对象

基于三维精细地质模型

通过数值模拟优化了储层压力、注气量、注气速度及关井气油比等关键参数

制定了最优技术政策

经矿场应用取得良好开发效果。研究表明

对低渗油藏CO

非混相驱

恢复储层能量的主控机理为注气溶解膨胀原油

而提升驱油效率的主控机理为溶解膨胀原油、降低界面张力及蒸发抽提轻质组分。研究成果可为同类型油藏CO

非混相驱的方案制定及现场应用提供参考。

Abstract

immiscible flooding is a very important technology for low permeability reservoirs with strong heterogeneity

high miscibility pressure of crude oil or severe reservoir voidage. Firstly

the expansion experiments and MMP test of CO

injection are carried out

and the IFT and mole content of oil and gas phase of each block are tested by numerical simulation. And then

the dominant mechanism of CO

injection to recover reservoir energy and improve oil displacement efficiency in low permeability reservoir are revealed. Therefore

taking M Block with low-permeability as the research object

and bas

ed on 3D fine geological modeling

the numerical simulation is applied to optimize reservoir pressure

gas injection volume

gas injection velocity

shut-in gas-oil ratio and other parameters

and the optimal technical policy is formulated. Preferable recovery performance is obtained through field application. The results show that for the CO

immiscible flooding technology in low permeability reservoirs

dissolving and expanding oil phase by gas injection are the dominant mechanism for both recovering reservoir energy and improving oil displacement efficiency

besides

the latter still need to reduce the IFT and evaporate and extract the light components. This study provides a reference for the formulation of CO

immiscible continuous flooding scheme in other reservoirs of the same type.

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Dominant mechanism and application of CO2 immiscible flooding in M block with low permeability

DOI：10.13809/j.cnki.cn32-1825/te.2020.03.010

摘要

Abstract

关键词

Keywords

references

Dominant mechanism and application of CO₂ immiscible flooding in M block with low permeability