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Microbiological clogging is a factor that threatens proper operation of water curtain system in underground hydrocarbon storage caverns. Experimental studies were conducted to validate the effectiveness of bioclogging prevention and/or removal method currently used at each storage cavern. After artificial formation of bioclogging onto fracture surfaces of rock cores by injection of sea water or fresh water with nutrients, variations in the amount of discharge water and the number of planktonic bacteria were measured. Effect of bactericide on removal of pre-formed bioclogging was also studied. While the number of planktonic bacteria in sea water increased during clogging formation, it decreased in fresh water. The result indicated that enumeration of planktonic bactertia may not be a quantitative indicator of bioclogging. Bactericide treatment led to removal of planktonic bacteria in water. However, the amount of discharge water decreased again over time, which indicated that bactericide might not effectively remove pre-formed bioclogging.

Experimental Study for Validation of Treatment Efficiency of Microbiological Clogging in Underground Hydrocarbon Storage Caverns