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Mineralogical and microbiological clogging was investigated through experiments employing rock core columns for proper management of water curtain system in underground hydrocarbon storage caverns. Injection of the solution synthesized for calcite oversaturation resulted in precipitation of calcite on fracture surfaces and thus significant decrease in effluent volume through the columns over time. When the calcite clogging was treated with 0.1 N HCl, the effluent volume was recovered at 4 days. Microbiological clogging by slime-forming bacteria also led to fracture closure over time. Injection of 50 and 100 ppm of peroxyacetic acid as a bactericide to the bioclogging partly restored the effluent volume, however, the fracture was closed again over time. The result indicated that bactericide treatment might not be significantly effective for removal of sessile bacteria forming biofilms on fracture surfaces.

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A Study on Mineralogical and Microbiological Clogging in Water Curtain System of Underground Hydrocarbon Storage Caverns - Calcite and Slime-Forming Bacteria