NATURAL GAS RECOVERY METHOD

• Main Author: KOYAMA HIROSHI
• Format: Patent
• Language: English; Japanese
• Published: 26.04.2018
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

PROBLEM TO BE SOLVED: To provide a method for recovering natural gas capable of efficiently recovering the natural gas while preventing subsidence of ground when recovering the natural gas from a plurality of natural gas formations with one well in the natural gas field having the plurality of natural gas formations.SOLUTION: A method for recovering natural gas of this invention, comprises burying a double pipe 20 in the ground by penetrated through a plurality of natural gas formations 11 to 13, and attaching respective valves 31 to 36 to two portion of upper and a lower of each natural gas formation, and pumping up brine absorbed the natural gas through an inner pipe 21 via the upper valve attached to one of the plurality of natural gas formations 11 to 13, and then recovering the natural gas from the brine absorbed the natural gas, after its separation treatment, and adjusting reused brine by mixing a specific-gravity agent and an additive agent into the brine which having already removed natural gas, and returning the reused brine into said gas collecting formation through the outer pipe 22 and the under valve.SELECTED DRAWING: Figure 1 【課題】ガス層が複数層存在するガス田において１つの井戸により複数のガス層から天然ガスを採取する際、地盤沈下を防止しつつ効率良く天然ガスを採取することができる天然ガス採取方法を提供する。【解決手段】本発明の天然ガス採取方法は、二重管２０を複数のガス層１１〜１３を貫くように地中に埋設し、各ガス層における上下二箇所にバルブ３１〜３６を設置し、複数のガス層１１〜１３のうち採取層における上側のバルブから採取したかん水を内管２１を用いて汲み上げ、汲み上げたかん水から天然ガスを採取し、天然ガスを採取し終えたかん水に比重増加剤を添加剤として混ぜ、該かん水を外管２２を用いて戻すとともに前記採取層における下側のバルブから前記採取層に還元する。【選択図】図１