Gas injection and brine exhaust method in full mining space of old cavity of salt mine

Abstract

The invention discloses a salt mine old cavity full mining-induced space gas-injection bittern-discharging method. The salt mine old cavity full mining-induced space gas-injection bittern-dischargingmethod comprises the steps that a new cavity is built first and then communicates with an old cavity, gas is injected into the old cavity to enable bittern in the old cavity to be discharged from thenew cavity, then a gas storage is formed, and sediment gaps are basically occupied by the gas finally, so that gas injection for bittern discharging in sediments is achieved. The technical problem that in the prior art, the bittern in the sediment gaps cannot be discharged is solved, the old cavity forming rate is increased, and the gas storage volume of the old cavity is increased to enable the built gas storage to store the more gas; and the overall form of the old cavity does not need to be measured, and the problem that in the prior art, form detection of the butted-well old cavity is difficult is solved. According to the salt mine old cavity full mining-induced space gas-injection bittern-discharging method, the output-to-input ratio is high, and the building speed is high.

Description

technical field [0001] The invention relates to the technical field of salt cavern gas storage construction, in particular to a method for injecting gas into the full mining space of an old cavity of a salt mine and exhausting brine. Background technique [0002] my country's natural gas reserves are seriously insufficient. At the same time, with the development of new energy storage methods such as hydrogen storage in compressed gas storage power plants, there is an urgent need to build a large number of large-scale underground gas storage. my country's salt mining has a long history and a huge scale. After brine mining in salt mines, a large number of underground dissolution cavities are formed. These dissolution cavities are usually called old brine mining chambers (referred to as "old chambers"). [0003] At present, there are mainly the following technical problems in the aspect of gas injection and brine discharge when the old cavity is converted into a gas storage: ...

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Problems solved by technology

[0010] The present invention provides a method for gas injection and brine discharge in the old cavity of the salt mine, which avoids the problem of difficult detection of the shape of the old cavity of the docking well in the prior art, and solves the problem that the brine in the sediment gap cannot be removed in the prior art. The technical problem of discharge has achieved the technical effect of improving the cavity forming rate of the old cavity and increasing the volume of the gas storage

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