Physical Simulation of Carbonate Particle Migration in Gas Storage

doi:10.3969/j.issn.1006-6535.2020.05.014

Abstract

Abstract: Particle migration may be induced due to the excessive pressure during injection and production process in gas storage well.Carbonate reservoir core samples in gas storage were taken to prepare samples with artificial fractures. Stress sensitivity test and velocity sensitivity tests of dry and water-bearing samples were conducted to simulate the fluid flow in dry and water-bearing samples under an increase of gas storage injection production pressure,and the corresponding sample permeabilities were measured during the experiment.Scanning electron microscopy was used to detect the fracture surface before and after stress sensitivity experiment to reveal the particle migration mechanism of gas storage injection-production process.Experiment indicates that the velocity sensitivitiy of dry and water-bearing core samples are medium-weak to medium-strong and medium-strong to strong respectively.The corresponding stress sensitivity is weak to medium-weak.The average permeability loss ratios of dry and water-bearing core samples are 77% and 84% for the particle migration simulation with a increase of gas storage injection-production pressure.Research indicates that the major particle migration mechanisms include the tensile failure of particle on the fracture surface results from high velocity gas flow dragging and rock damage under effective stress in the injection-production process.The rock strength decreases under water condition,which will intensify particle migration.It is recommended to restrict injection-production pressure and reduce fluid flow into gas storage well to prevent the generation of particles an enhance the multi-scale injection-production efficiency of gas storage.This research could provide certain reference for the reasonable injection-production pressure maintenance.

Key words: gas storage, carbonate rock, injection-production process, particle migration, effective stress

CLC Number:

TE311

You Lijun, Shao Jiaxin, Wang Du, Wang Han, Kang Yili, Chen Mingjun. Physical Simulation of Carbonate Particle Migration in Gas Storage[J]. Special Oil & Gas Reservoirs, 2020, 27(5): 94-99.

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