LEAK-TIGHTNESS DETERMINATION METHOD FOR UNDERGROUND GAS STORAGE FACILITIES WITH WATER DRIVE OPERATION MODE Russian patent published in 2015 - IPC E21B47/10 G01M3/00 B65G5/00 

FIELD: oil and gas industry.

SUBSTANCE: stratum is impact cyclically, at that each cycle of impact includes gas injection to the stratum with further gas extraction. The stratum is impacted during 10 cycles at least. In each cycle current formation pressure as well as gas extraction (or injection) volume is measured simultaneously in gas- $$\left(P_t^{\text{'}\text{'}ф\text{'}\text{'}}\right)$$ and water-bearing $$\left(P_t^{\text{'}\text{'}фв\text{'}\text{'}}\right)$$ zone of the storage facility, then considering the measured parameters the design pressure in the underground storage facility $$\left(P_t^{\text{'}\text{'}P\text{'}\text{'}}\right)$$ is defined for the facility operation mode without gas losses and operation mode with gas losses. Then function (F) is defined as arithmetic mean value of deviations $$\left(P_t^{\text{'}\text{'}P\text{'}\text{'}}\right)$$ from $$\left(P_t^{\text{'}\text{'}ф\text{'}\text{'}}\right)$$ , which are received for each i^th measurement for the facility operation mode without gas losses and the function (Fy) for the facility operation mode with gas losses and when inequality Fy<F is satisfied the summary is made about available gas leaks in the storage facility.

EFFECT: simplifying control of gas leak-tightness, improving reliability and safety of the underground storage facilities made in the water-bearing strata.

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