DISPLACEMENT OF GAS BY WATER FROM FRACTURED-POROUS RESERVOIR ROCKS

Abstract

This article presents the results of experimental studies of the processes by which gas is displaced by water from models of fractured-porous media that meet the appropriate criteria of simulation. The difficulties of modeling a fractured-porous reservoir rock are well known. In the experiments described, the model consisted of combinations of low-permeability porous blocks, each of which was an artificially cemented sandstone. The blocks were placed in a tube and separated from each other by thin layers of fine-grained sand, simulating a fractured system. The experiments used blocks 0.072-0.074 m in diameter and 0.1-0.2 m in length, with permeabilities of 0.002-0.020 μm2 and porosities of 22 to 30 percent; the permeability of the 'fractures' was about 1 μm2.