Layered mining pipe string of rock salt mine and a layered mining method of rock salt mine

Abstract

The invention discloses a rock salt mine layered-mining pipe string and a rock salt mine layered-mining method, and belongs to the technical field of rock salt mine mining. Through the rock salt minelayered-mining pipe string and the rock salt mine layered-mining method, the defect that the prior art lacks a layered water-injection huff and puff process pipe string and a related mining method torealize layered water-injection huff and puff mining of a rock salt mine is overcome. The rock salt mine layered-mining pipe string mainly comprises an oil pipe, a hollow rod, a hollow pump, a hollowjacking rod, an outer oil pipe, an upper packer, an inner oil pipe, a flow path conversion nipple, a bridge-type passage and a lower packer, the lower end of the oil pipe is connected with the hollowpump, the lower end of the hollow pump is connected with the outer oil pipe and the inner oil pipe through double fasteners correspondingly, the lower end of the outer oil pipe is sequentially connected with the upper packer, the bridge-type passage and the lower packer, the upper packer and the lower packer are sealed on the inner wall of a casing, the lower end of the inner oil pipe is connectedwith the flow path conversion nipple, the side face of the flow path conversion nipple is connected with the bridge-type passage, the hollow rod is arranged in the oil pipe in a sleeved mode, the lower end of the hollow rod continues to be connected with the hollow jacking rod through a hollow pump plunger, and a single-flow valve is mounted in the hollow jacking rod.

Description

technical field [0001] The invention belongs to the technical field of rock salt mine mining, and in particular relates to a layered mining pipe string for rock salt mines. Background technique [0002] At present, rock salt mines are mainly mined by water injection dissolution method. After the mining well is put into production, water injection dissolves the rock salt near the well to form a rock salt solution cavity filled with brine, and then the brine is pumped to the ground by an underground pump for subsequent treatment on the ground to complete a cycle. Mining, and then continue the mining process of circulating water injection and brine pumping. Since the downhole string needs to meet the two processes of water injection and brine pumping, that is, the process of water injection huff and puff, the downhole string is relatively complicated, and generally only single-layer mining can be carried out. However, multi-layer layered water injection huff and puff mining req...

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Problems solved by technology

[0002] At present, rock salt mines are mainly mined by water injection dissolution method. After the mining well is put into production, water injection dissolves the rock salt near the well to form a rock salt solution cavity filled with brine, and then the brine is pumped to the ground by an underground pump for subsequent treatment on the ground to complete a cycle. Mining, and then continue the mining process of circulating water injection and brine pumping. Since the downhole string needs to meet the two processes of water injection and brine pumping, that is, the process of water injection huff and puff, the downhole string is relatively complicated, and generally only single-layer mining can be carried out. However, multi-layer layered water injection huff and puff mining requires more complex downhole process strings, which cannot be realized at present. Therefore, it is only possible to block this layer after mining one layer, and then shoot and produce another layer. The overall production speed and less efficient

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