METHOD OF UNDERGROUND GAS STORAGE OPERATION IN EXHAUSTED OIL-GAS CONDENSATE POOL Russian patent published in 1994 - IPC

FIELD: gas and oil industry. SUBSTANCE: exhausted oil field has an oil zone in near bottom zone 5 of the pool and a gas cap in near ceiling zone 2. Injection and gas extraction are exercised through bore-holes of zone 2 in gas cap. During injection due to pressure increase interpretability of oil and gas increases. Oil is concentrated in near bottom zone. Oil extraction is exercised through bore-holes of zone 5. To provide oil inflow to bore-holes of zone 5 from dead zones in the pool wings of submerged zone 8 and compensate for buffer object during extraction of liquid hydrocarbons extracted volume of buffer fluids is changed with hydrocarbon mixture of methane row with molecule mass of 17 - 60 kg/kmol. EFFECT: increase of liquid hydrocarbons extraction and decrease of operational expenditures. 1 dwg