Petroleum Reservoir Evaluation and Development >

2020 , Vol. 10 >Issue 2: 76 - 82

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

Reservoir Development

Numerical simulation of wormhole propagation considering natural micro-fractures

  • Liqiang ZHAO ,
  • Runyu WANG ,
  • Pingli LIU ,
  • Chong LIANG ,
  • Honglan ZOU ,
  • Zhifeng LUO
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  • 1.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2.Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China）;

Received date: 2020-01-31

  Online published: 2020-04-28

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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

Cite this article

Liqiang ZHAO , Runyu WANG , Pingli LIU , Chong LIANG , Honglan ZOU , Zhifeng LUO . Numerical simulation of wormhole propagation considering natural micro-fractures[J]. Petroleum Reservoir Evaluation and Development, 2020 , 10(2) : 76 -82 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.02.013

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