低渗透M油藏CO2非混相驱主控机理及应用

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

摘要/Abstract

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,CO₂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CO₂膨胀实验,并测定了CO₂-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CO₂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CO₂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CO₂非混相驱的方案制定及现场应用提供参考。

关键词: 低渗透油藏, 恢复储层能量, 主控增油机理, 技术政策优化, 矿场试验

Abstract:

CO₂ 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 CO₂ 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 CO₂ 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 based 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 CO₂ 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 CO₂ immiscible continuous flooding scheme in other reservoirs of the same type.

Key words: low permeability reservoir, reservoir energy recovery, dominant EOR mechanisms, parameter optimization, field application

中图分类号:

TE345

金忠康,王智林,毛超琪. 低渗透M油藏CO₂非混相驱主控机理及应用[J]. 油气藏评价与开发, 2020, 10(3): 68-74.

Zhongkang JIN,Zhilin WANG,Chaoqi MAO. Dominant mechanism and application of CO₂ immiscible flooding in M block with low permeability[J]. Reservoir Evaluation and Development, 2020, 10(3): 68-74.

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地层压力/ MPa	关井气油比/ （m³·m^-3）	提升采出程度/ %	总注气量/10⁴t	换油率/（t·t^-1）
21.5	1 000	2.35	2.6	0.32
23.0	1 000	2.92	3.7	0.37
25.0	1 000	3.52	4.9	0.35
28.5	1 000	3.87	8.3	0.29

序号	储层压力/ MPa	关井气油比/ （m³·m^-3）	提升采出程度/ %	总注气量/10⁴ t	换油率/ （t·t^-1）
1	25	300	2.23	2.8	0.40
2	25	600	2.86	3.9	0.37
3	25	1 000	3.52	4.9	0.35
4	25	2 000	3.83	5.3	0.32

低渗透M油藏CO₂非混相驱主控机理及应用

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

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