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 Underground salt formations can be used for natural gas and natural gas liquids storage. These formations are well suited to natural gas storage in that salt caverns, once formed, allow little injected natural gas to escape from the formation unless specifically extracted. The walls of a salt cavern also have the structural strength of steel, which makes it very resilient against reservoir degradation over the life of the storage facility. Saturated brine is used to displace the gas or liquid, the brine is injected into the cavern to drive the stored fluid to the surface. The excess brine is kept in storage pits on the surface. If the pits are located in a region where the rainfall is greater than evaporation, the brine becomes diluted and can cause damage to the salt formation when injected. A concentration process is required to return the brine to saturation.  Aqua-Pure currently has an installation at a Liquid Petroleum Gas (LPG) Storage Cavern Facility, where an MVR Evaporator is used to concentrate dilute salt brine to saturation. The evaporator produces saturated brine for cavern injection and pure distilled water for use as process water at an adjacent facility. |
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