Similarity Criteria of Water Drive Physical Simulation of Pressure-Sensitive Fractured Reservoirs

Nie Bin,Gu Shaohua,Zeng Sijia,Hao Xiong

doi:10.1155/2021/5042656

Abstract

A mathematical equation of water drive physical simulation of pressure-sensitive fractured reservoirs was established based on previous research results. In this study, the similarity criteria of water drive physical simulation of pressure-sensitive fractured reservoirs were derived according to the similarity theory. First of all, based on the three-dimensional differential equation of rock mechanics, a dimensionless analysis was conducted to determine the similarity relationship between the displacement of oil by water of pressure-sensitive fractured reservoirs, the similarity criterion was obtained, and the similarity criteria were formed. Secondly, according to the similarity criterion, the similar relationship between the stress-strain fields of the real object and the simulated object was worked out. Thirdly, the finite element software COMSOL Multiphysics was applied to model and calculate the multifield coupling process in the percolation of pressure-sensitive fractured reservoirs, verifying the correctness of the established similarity criteria and similarity relationship. The verifying results shows that the similarity between the physical model and the actual model can be realized by magnifying the geometric size N times in a certain direction and adjusting the load and boundary conditions according to the similarity principle, which can be used for the design of the pressure-sensitive fractured reservoir simulation model for a physical indoor test.

Highlights

The reservoir simulation has two types of approach, numerical reservoir simulation and physical reservoir simulation
To further find out the variation pattern of fracture permeability during the water drive development of pressure-sensitive fractured reservoirs, it is necessary to carry out three-dimensional quantitative physical simulation, which is a method of reservoir simulation by building an indoor physical model to simulate the field reservoir
This study provides a method to design the physical model for fractured reservoir pressure-sensitive simulation

Summary

Introduction

The reservoir simulation has two types of approach, numerical reservoir simulation and physical reservoir simulation. The numerical stimulation predicts the flow of liquids in the reservoir (oil, gas, and water) through porous media once the production starts These real-time simulations are studied using computer models which calibrate the data based on numerical equations and predict the behavior of the reservoir once the production starts. To further find out the variation pattern of fracture permeability during the water drive development of pressure-sensitive fractured reservoirs, it is necessary to carry out three-dimensional quantitative physical simulation, which is a method of reservoir simulation by building an indoor physical model to simulate the field reservoir. The role of similarity criteria must explain theoretically the following contents: the nature of similar phenomena, the application of similar phenomena, and the conditions to achieve similarity To answer these questions, analysis and derivation must be carried out according to the three

Objectives

Discussion

Conclusion