| 摘要 |
PROBLEM TO BE SOLVED: To provide a recovery method of water soluble natural gas by carbon dioxide dissolved water capable of recovering the substantially whole quantity of water soluble natural gas and iodine buried without sinking the ground, and capable of stably storing CO<SB>2</SB>in a storage layer after development drilling without causing leakage over a long period of time. SOLUTION: CO<SB>2</SB>dissolved water 3 of higher density than that of stratum water 2 is pressed in the stratum water 2 existing storage layer from a press-in well 4 arranged in a structural position lower than a production well 5, and the stratum water 2 is pushed up toward the production well 5 by this CO<SB>2</SB>dissolved water 3. At this time, a press-in quantity of the CO<SB>2</SB>dissolved water 3 and a pumping-up quantity of the stratum water 2 are adjusted so that pressure in the storage layer becomes hydrostatic pressure. Next, the stratum water 2 pumped up from the production well 5 is separated into the water soluble natural gas 12 and brackish water 13, and the iodine is also recovered from the brackish water 13. The brackish water after recovering the iodine is reused as the CO<SB>2</SB>dissolved water 3 by mixing CO<SB>2</SB>. COPYRIGHT: (C)2008,JPO&INPIT |
