Method for jointly mining salt through directional well and submergence electric pump

Abstract

The invention discloses a method for jointly mining salt through a directional well and a submergence electric pump. The method comprises the following steps that (1) water injection is conducted on asalt cavity of a brine well of a communicating and to-be-mined salt bed; (2) the stability area nearby the salt cavity of the brine well is determined; (3) the directional well is drilled on the stability area, and the directional well communicates with the salt cavity; and (4) the electric submergence pump is down into the directional well, and brine in the salt cavity is extracted. According tothe method for jointly mining the salt through the directional well and the submergence electric pump, the pressure in the salt cavity is obviously lower than that of a water-lift brine mining technology, etching and damage of injected water to surrounding rock are slowed down, meanwhile, the directional well and brine extracting equipment are located in the stability area, production is stable,and the brine quality is good; and the method is safe, the production period is long, salt mine falling off from the interior of the salt cavity can be dissolved and recovered, the method can be usedin a well group which loses the airtight condition, and the recovery ratio of the salt mine is effectively increased.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a water-soluble mining process for drilling a salt mine. Background technique [0002] Drilling water-soluble mining method is a more common method for mining salt deposits. There are two categories of single well circulation and well group circulation production technology. The common feature is that the solvent is injected from the drilling hole - fresh water, and the fresh water dissolves the salt layer to generate an aqueous solution of salt (called brine in the salt mining industry), and the brine is lifted to the ground along the wellbore through the residual pressure of the water injection (salt mining industry). It is called water-lifting brine). [0003] The solution cavity produced by drilling water solution mining is large in scale, and the span is generally about 30-100 meters. However, the strength of the salt mine itself and the roof of the salt mine (t...

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Problems solved by technology

[0004] At present, the recovery rate of salt mine drilling and water solution mining is generally only 10%-20%, and the recovery rate of some thick and large salt deposits is even less than 8%, and there are problems such as land subsidence, subsidence and groundwater pollution.

[0005] like figure 1 As shown, the brine well 4 is generally a single-well convection well, or a water injection well of a connected well group, and a dissolution cavity 6 is generated during the production process. As the span of the dissolution cavity 6 increases, the general solution cavity radius is only 3-4 meters. , it will cause the caving of the salt layer and the roof, and the scale of the dissolution chamber for water-soluble salt mining is relatively large, and the span of the dissolution chamber can reach 30-100 meters, so the scale of the caving is relatively large, and a large number of caving salt blocks 7 are accumulated in the dissolution chamber In the saturated brine in the lower part, these salt blocks cannot be extracted because they are not dissolved by the saturated brine, resulting in a waste of salt mine resources

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