缝洞型油藏注烃气提高采收率参数优化数值模拟研究

doi:10.13809/j.cnki.cn32-1825/te.2022.06.009

Abstract

Abstract:

Fractured-cavity reservoirs have diverse storage spaces, strong heterogeneity, large differences in oil-water properties, high mobility ratio of immiscible nitrogen flooding in water flooding, serious water and gas channeling, limited sweeping range, and primary and secondary oil recovery stages. Oil recovery is much lower than that of clastic sandstone reservoirs. Taking the S91 fracture-cavity unit in Tahe Oilfield as the object, on the basis of geological modeling, history matching, remaining oil characterization and phase state experimental fitting, a numerical simulation study on enhanced oil recovery by hydrocarbon injection in fractured-cavity reservoirs is carried out, so as the evaluation of the hydrocarbon-gas miscibility conditions in fractured-cavity reservoirs, and the optimization of EOR parameters of hydrocarbon injection. The results show that the minimum miscibility pressure of injected hydrocarbon gas and formation crude oil in S91 unit is 42.5 MPa, which can be miscible under the current formation pressure. The mechanism of miscibility is vaporization gas flooding. As the content of heavy hydrocarbon components in the injected gas increases, the recovery factor increases. The gas injection method is gas injection in fractured reservoirs, and liquid recovery in caved reservoirs. The gas injection parameters are preferably 168×10⁴ m³, gas injection rate of 4×10⁴ m³/d, and injection-production ratio of 1∶0.9.

Key words: fractured-cavity reservoir, hydrocarbon-gas miscible flooding, numerical modeling, parameter optimization, Tahe Oilfield

CLC Number:

TE357

CHENG Xiaojun. Enhanced oil recovery and parameter optimization of hydrocarbon injection in fractured-cavity reservoirs[J].Petroleum Reservoir Evaluation and Development, 2022, 12(6): 902-909.

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原始拟组分	摩尔分数（%）	划分后拟组分	摩尔分数（%）
CO₂	1.83	CO₂	1.83
N₂	2.66	N₂	2.66
C₁	42.17	C₁	42.17
C₂	7.41	C₂	7.41
C₃	3.33	C₃₊	10.63
iC₄	0.88
nC₄	2.13
iC₅	0.96
nC₅	1.30
C₆	2.03
C₇	2.59	C₇₊	10.58
C₈	3.12
C₉	2.52
C₁₀	2.35
C₁₁₊	24.72	C₁₁₊	24.72

方案编号	注气井	累计产油量（t）	增油量（t）
1	不注气，S91井单独生产	8 632
2	TK832CH	15 889	7 257
3	TK725	9 747	1 115

Enhanced oil recovery and parameter optimization of hydrocarbon injection in fractured-cavity reservoirs

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