PERCOLATION APPROACH IN RESERVOIR SIMULATION OF WELL TREATMENT METHODS

Abstract

Relevance. When planning the operation of bottomhole zone treatment, it is important to predict the obtained technological and economic effect. Hydrodynamic modeling is a very useful tool to achieve this aim. When modeling the movement of fluids in a porous space, it is necessary to use models that take into account the complex structure of pores and channels in the bottomhole zone. One of the approaches, modelling the reservoir complex structure with using grids, is described by the percolation theory. The main aim of this work is to evaluate the possibility of using the percolation theory to simulate the heterogeneous reservoir properties of the bottomhole zone. Methods: modeling method based on the percolation theory. In the field of natural sciences, the percolation theory is used to determine the values of the percolation threshold for fluid flow through a porous space with a complex channel structure. Modeling the porous space of oil reservoir using a percolation theory seems to be a promising direction. This approach takes into account the heterogeneity of bottomhole zone reservoir properties, the complex structure of the acid compositions flow in the porous space and the fractal nature of formation of new channels. Results. The article presents the results of modeling a well acidizing based on field data. The simulation results using the percolation theory show a good convergence of the calculated indicators with the actual data. The percolation method can also be used to simulate enhanced oil recovery methods: injection of surfactants, polymers, complex water flooding, acid treatments, and other methods. In hydrodynamic modeling, describing the movement of fluids in porous space the percolation approach aims to take into account the features of pore channels structure and the interaction of fluids with surface of formation.

Keywords

• hydrodynamic modeling
• reservoir properties
• bottomhole zone
• percolation theory
• matrix acidizing
• permeability