Salt mine double-well solution mining method

Abstract

The invention relates to a salt mine double-well solution mining method, in particular a salt mine double-well solution mining method. In the method, injection holes are formed on two sides of the bottom of an under central pipe in a vertical well; in a double well production process, part of clean water is separated and injected into the central pipe in the vertical well when the clean water is injected into a horizontal well, so that the clean water flows into a casting from the injection holes of the central pipe in the vertical well to dilute oversaturated brine in the casting in the vertical well; and the injection water flow in the central pipe of the vertical shaft is displayed and monitored by an electromagnetic flowmeter, so the concentration of the brine discharged from the vertical well can be controlled accurately. The method has the advantages that: 1, the concentration of the brine discharged from the vertical well in a double-well solution mining process can be accurately controlled; 2, the concentration of the brine discharged is prevented from being overhigh in a production process so as not to arouse crystallization and block the underground casting or a ground brine return pipe, and thus, the safe, continuous and high-efficiency production capacity of the salt wells is improved; and 3, as a large amount of high-pressure clean water is injected into the central pipe in the vertical well to wash the underground casting in the vertical well and the ground brine return pipe, the crystallization or scaling on the pipe wall can be prevented, potential accidents are eliminated, and well repair times and cost can be reduced greatly.

Description

technical field [0001] The invention relates to an underground salt mining method, in particular to a method for water-soluble mining of salt mines. technical background [0002] The mining methods of salt mines are generally divided into two types: single-well water-soluble mining and pair-well water-soluble mining. Single well water solution mining adopts the method of central pipe water injection and casing pipe brine water solution mining. When a target dissolution cavity is formed in the target layer at the bottom of a single well, the directional drilling horizontal well docking technology is generally used to connect the two wells for water-solution mining of the opposite well. This mining technology generally adopts water injection in horizontal wells, and brine solution mining in vertical well casings. Use a high-pressure centrifugal brine pump to inject clean water into the bottom of the horizontal well. The clean water dissolves rock salt in the target layer of ...

AI Technical Summary

Problems solved by technology

If it is not resolved for a long time, the downhole casing of the vertical well and the brine return pipeline on the ground may be blocked due to the crystallization of supersaturated brine, resulting in an accident of downhole crystallization pipe plugging, which seriously threatens the safe production of the well.

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