Study on Influence of Displacement Pressure Gradient on Water Flooding Oil Recovery

doi:10.19596/j.cnki.1001-246x.8726

Abstract

Abstract:

For sandstone reservoirs with extremely high water content, the Volume of Fluid (VOF) method is able to trace the dynamic changes of multiphase interface and reproduce the physical process of microscopic seepage. The influence of different displacement pressure gradients on the microscopic occurrence characteristics of remaining oil and water flooding recovery is studied. The influence of displacement pressure gradient on water flooding recovery is revealed by analyzing the seepage characteristics and remaining oil occurrence state in microscopic pore structure. The increase of displacement pressure gradient can break through capillary force of small throat, form a new seepage channel, and increase the water flooding recovery. The viscosity and wettability of crude oil affect the recovery degree under different pressure gradients.

Key words: super high water, waterflood recovery, remaining oil, volume of fluid method, displacement pressure gradient

CLC Number:

TE312

Wenfu CUI. Study on Influence of Displacement Pressure Gradient on Water Flooding Oil Recovery[J]. Chinese Journal of Computational Physics, 2024, 41(3): 325-333.

Figures/Tables 15

Fig.1 Model construction (a) saturated water; (b) oil flooding water

Fig.2 Verification model

Fig.3 (a) Velocity distribution on cross section; (b) Pressure distribution on center line

Fig.4 Residual oil occurrence forms under pressure gradients of (a) 0.01 MPa·m-1; (b) 0.03 MPa·m-1 and (c) 0.07 MPa·m-1

Fig.5 Recovery degree under different displacement pressure gradient

Fig.6 Pressure difference curve between P1 and P2

Fig.7 Flow field distribution with pressure gradients of (a) 0.03 MPa·m-1 and (b) 0.07 MPa·m-1

Fig.8 Oil recovery with different viscosity

Fig.9 Residual oil distribution with different crude viscosity (a)12 mPa·s; (b) 32 mPa·s

Fig.10 Variation of water consumption per unit recovery rate at different crude oil viscosity

Fig.11 Variation of recovery with displacement pressure gradient at different wetting angles

Fig.12 Residual oil distribution at different wetting angles

Table 1 The scheme design of variable displacement pressure gradient

模式	取值/(MPa·m^-1)
低驱替压力	0.03
高驱替压力	0.07
高-低-高模式	0.03-0.07-0.03
低-高-低模式	0.07-0.03-0.07
低-高模式	0.03-0.07
高-低模式	0.07-0.03

Fig.13 The recovery degree changes with variable displacement pressure gradient

Fig.14 Flow field distribution with displacement pressure gradient of (a) low, (b) high-low-high, (c) low-high-low, and (d) high

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