Gas injection and brine discharge in rock salt gas storage studied via numerical simulation

Underground gas storage in rock salt is of great importance for peak-shaving and emergency gas supply. This paper addressed an actual rock salt underground gas storage facility in Jiangsu province, China, as the research project and carried out the following research centered on a detailed geologica...

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Bibliographic Details
Published in:PloS one 2018-11, Vol.13 (11), p.e0207058-e0207058
Main Authors: Liu, Jianjun, Wang, Yingjie, Xie, Kai, Liu, Yichen
Format: Article
Language:English
Subjects:
Brines
Civil engineering
Computer simulation
Discharge pipes
Earth science
Earth Sciences
Engineering and Technology
Flow velocity
Gas injection
Halites
High pressure
Injection
Mathematical models
Multiphase flow
Natural gas
Numerical analysis
Numerical simulations
Permeability
Petroleum
Physical Sciences
Research and Analysis Methods
Research projects
Reservoirs
Rock salt
Rocks
Saline water
Salt
Salts
Simulation
Soil mechanics
Storage
Two phase flow
Underground storage
Underground storage tanks
Workers
Working conditions
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Summary:Underground gas storage in rock salt is of great importance for peak-shaving and emergency gas supply. This paper addressed an actual rock salt underground gas storage facility in Jiangsu province, China, as the research project and carried out the following research centered on a detailed geological model, a salt cavern model and the process of gas injection and brine discharge. First, based on the theory of gas-liquid two-phase flow, the authors established a relationship between brine flow and natural gas bubbles under high pressure in the process of brine discharge. Second, the effect of pipe depth on the gas injection and brine discharge was simulated. The objective was mainly to choose the best combination of pipe depth and rate of brine discharge flow based on analysis of the relationship between the brine discharge pipe depth and the flow rate of the residual brine, and the optimal rate was given according to different distances. Third, the effect of residual brine on the gas injection and brine discharge was analyzed. The relationship curves between the maximum velocity on the surface of brine and the distance from the lower end of the brine discharge pipe to the bottom of the gas storage were obtained, and reasonable rates were suggested under different actual working conditions.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0207058