A kind of air-cushion brine mining method of salt rock formation containing high impurity salt rock and mudstone interlayer

Abstract

The invention discloses an air-cushion brine mining method for salt rock formations containing high-impurity salt rock and mudstone interlayers. The high-pressure gas forms an air cushion on the top of the cavity; 3) After the lateral size of the cavity reaches the standard, the gas-liquid interface is kept above the salt rock roof; 4) When the dissolution is insufficient for a period of time, the discharge of injected water is increased. 5) When the up-dissolution encounters the mudstone interlayer, the gas-liquid interface is lowered to form an air cushion under the mudstone interlayer. When the lateral size of the cavity below the mudstone interlayer reaches the standard, the gas-liquid interface is raised to make the brine fully contact with the mudstone interlayer, so as to promote the brine Infiltrate into the mudstone interlayer, soften and collapse the mudstone interlayer; 6) After the mudstone interlayer completely collapses, the cavity mainly undergoes up-dissolution; according to 3-6 cycles, the invention solves the dissolution of the high impurity salt rock formation, the control of the interlayer collapse and the cavity Body shape control issues.

Description

technical field [0001] The invention relates to a method for mining brine, in particular to an air cushion method for mining brine. Background technique [0002] my country is a big country in mine salt mining. The annual volume of mine salt mining reaches 50 million tons, which is close to 60% of my country's salt production. A large amount of industrial raw material - NaCl can be obtained through mine salt mining. At the same time, huge cavities can be formed underground by mining salt in wells, and these cavities are recognized as ideal spaces for oil and gas reserves at home and abroad. my country's dependence on foreign oil and natural gas is as high as 70% and 45%. The establishment of a complete strategic oil and gas reserve system is an important part of ensuring national energy security. In particular, the escalation of the Sino-US trade war and the raging new crown epidemic have further reminded us of the urgency of building our own energy reserve system. Therefo...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an air-cushion brine mining method for salt rock formations containing high-impurity salt rock and mudstone interlayers, to solve the problems of dissolution of high-impurity salt rock formations, control of interlayer collapse and cavity shape control, and at the same time solve The problem of how to obtain high-value refined brine in brine mining and cavity construction in salt mines

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