Buffer volume of gas
BUFFER VOLUME OF GAS (EN: buffer gas volume; DE: Puffergasvolumen; FR: volume de tamponnage de gaz; ES: volumen de gas taponado; RU: буферный объем газа) is the volume of the gas, which, during the normal cyclical operation, remains within the underground gas storage facility by the end of the process of the retrieval.
The buffer volume of the gas is the source of the mechanical energy, which is necessary for the delivery of the gas from the reservoir to the specified place. Thanks to the buffer volume of the gas, the yields of the boreholes are maintained at the required level. In case of the water-pressurised regime within the underground storage facility, the buffer volume of the gas counteracts the advancement of the formation waters, and prevents the flooding of the operational boreholes.
The buffer volume of the gas within the underground storage facility depends on the depth of the embedment, on the physical-geological parameters and thickness of the reservoir-collector, and also on the technological regime for the operation of the boreholes.
The buffer volume of the gas within the storage facilities, which are created at the exhausted gas fields, can form itself from the initial reserves, which have remained non-extracted within the gas-bearing reservoirs. The proportion of the buffer volume of the gas among the complete volume of the gas within the aquifer-storage facilities is 40-50%, within the exhausted gas fields is 30-50%, and within the artificial voids is 10-20%. See also the "Active volume of the gas" article.
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