Freshwater injection and brine discharge exchange device for water-soluble salt mining in drilling wells

Abstract

The invention discloses a freshwater injection and brine discharge exchange device for water-soluble salt mining in drilling wells. The device comprises a freshwater pipe, a brine pipe, a straight well connecting pipe, an inclined well connecting pipe and an exchange pipe group, wherein the exchange pipe group comprises a third valve, a fourth valve, a sixth valve and a fifth valve which are connected end to end through pipelines in sequence; the freshwater pipe is connected from the pipeline between the third valve and the fourth valve; the brine pipe is connected from the pipeline between the sixth valve and the fifth valve; the pipeline between the third valve and the fifth valve is connected with the straight well connecting pipe; and the pipeline between the fourth valve and the sixthvalve is connected with the inclined well connecting pipe. A straight well and an inclined well can be alternately used by controlling the valves, so that the balanced development of a dissolving cavity in a salt layer is guaranteed; and meanwhile, the main pipes such as the freshwater pipe, the brine pipe main pipe, a freshwater discharge pipe, a high-pressure freshwater pipe and the like are arranged on one side of the exchange pipe group, so that the difficulty of arranging the main pipes is greatly simplified, and the laying of branch pipes is facilitated.

Description

technical field [0001] The invention belongs to the field of salt mine drilling and water-soluble mining, and in particular relates to a water injection and brine exchange device for drilling water-soluble salt mining. Background technique [0002] Drilling water solution mining method is a relatively common method for salt deposit mining, and there are two types of single well circulation and well group circulation mining techniques. Its common feature is to inject solvent—fresh water from the well, and the fresh water dissolves the salt layer to generate a salt solution (called brine in the salt mining industry), and the brine is lifted out of the ground along the wellbore through the residual pressure of water injection. In order to ensure the balanced development of the solution cavity in the salt layer, the water injection well pipe and the brine production well pipe are often exchanged, and the exchange of water injection and brine production is usually realized throug...

AI Technical Summary

Problems solved by technology

For example, a device in which the main pipes are separated and exchanged on both sides of the valve occupies a large area, and it is inconvenient to replace the valve and maintain; although the vertical device occupies a small area, it not only has the problem of inconvenient operation but also inaccurate measurement.

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