考虑天然微裂缝的酸蚀蚓孔扩展数值模拟研究

doi:10.13809/j.cnki.cn32-1825/te.2020.02.013

Abstract

Abstract:

Natural micro-fractures in carbonate reservoirs are generally developed and have little effect on porosity, but has a great influence on the simulation results. In previous studies, the effect of micro-fractures on the growth of wormholes has not been studied in detail. Based on the double-scale wormhole propagation model, and the natural fracture model with a certain statistical distribution law produced by coupling of the Monte Carlo method, the acid wormhole propagation mathematical model considering the existing of natural fractures is established. By adjusting the parameters such as azimuth, density, length and connectivity of micro-fractures, the effects of its spatial distribution on wormhole propagation is studied. It is found that the existence of natural micro-fractures will reduce the pore volume of acid invasion into the cores, which greatly affects the optimal injection speed and acid-liquid dosage. Natural micro-fractures with high density can form complex dispersion fracture networks, increasing the permeability and production obviously. Increasing the length of micro-fractures can reduce the pore volume of acid invasion, and penetrate the damage zone rapidly. In the cores contain micro-fractures with better conductivity, the wormhole will connect the adjacent micro-fractures in the process of propagation, so as to increase the core's conductivity.

Key words: carbonate reservoir, natural micro-fracture, fracture geometry, wormhole propagation, numerical simulation

CLC Number:

TE357

ZHAO Liqiang,WANG Runyu,LIU Pingli,LIANG Chong,ZOU Honglan,LUO Zhifeng. Numerical simulation of wormhole propagation considering natural micro-fractures[J].Reservoir Evaluation and Development, 2020, 10(2): 76-82.

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编号	裂缝条数/n	迹长（L）/m	ΔL/m	Δa/（°）
1	100	0.1	0.01	30
2	100	0.1	0.09	30
3	100	0.1	0.01	90
4	300	0.1	0.01	90

参数名	数值	参数名	数值
岩石密度/（kg·m^-3）	2 710	反应速率常数/（m·s^-1）	2.0×10^-3
岩心平均孔隙度	0.2	扩散系数/（m²·s^-1）	3.6×10^-9
平均孔喉半径/m	1.0×10^-6	酸液黏度/（mPa·s）	1
平均比表面积/m^-1	5 000	酸液密度/（kg·m^-3）	1 080
酸液质量分数/%	20	酸溶解能力/（m³·m^-3）	1.372

Numerical simulation of wormhole propagation considering natural micro-fractures

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