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

Abstract

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

CLC Number:

TE345

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.

Figures/Tables 11

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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

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

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

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