Mining method suitable for thin interbed natural alkali mineral deposit

Abstract

The invention discloses a mining method suitable for a thin interbed natural alkali deposit, which comprises the following steps: S1: selecting at least two first mining layers with different depths from the surface and designing a water-soluble recovery mining unit according to the thickness and integrity of the thin interbed natural alkali mineral deposit; S2: arranging at least two straight wells arranged in a straight line in the deepest first mining layer, wherein all the straight wells pass through all the first mining layers, and all straight wells are injected with water for extractingand building caverns; S3: building a multi-branch horizontal well on the same plane of all the straight wells in S2, wherein the multi-branch horizontal well is arranged in a straight line with all the straight wells. The multi-branch horizontal well is communicated with all the straight wells along the first mining layers with different depths, through packing and perforating, all the straight wells form a water-soluble recovery mining unit with the mullti-branch horizontal well at each first mining layer, the connecting and communicating of multiple wells can be achieved, and the differentfirst mining layers are extracted at the same time, the contact area with the mine layers is increased, and the brine concentration of later injection and extraction is increased. Thus, the recovery rate of the mine layers is increased.

Description

technical field [0001] The invention relates to the technical field of trona drilling and mining, in particular to a drilling and water-soluble mining method for multi-layer co-mining of thin interbedded trona deposits. Background technique [0002] Trona is an evaporated salt mineral, hydrated sodium bicarbonate. It is mainly used for processing soda ash, caustic soda, baking soda, sodium sulfide, sodium sulfide, etc. It is widely used in chemical industry, building materials, light industry, metallurgy, petroleum, textile, medicine, fire protection, animal husbandry, glass, food and other industrial sectors. Alkali is commonly used in food production and washing in daily life, and alkali is an important basic chemical raw material in industrial production. [0003] Butt-drilling of horizontal wells and water-solution mining are the most common and effective methods for mining trona ore. This method utilizes the characteristic that trona is soluble in water, and uses hori...

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Problems solved by technology

The use of conventional horizontal well butt drilling for water solution mining of this type of ore seam has two main defects: 1) the ore seam is thin, and the trajectory of the horizontal section is easy to deviate from the ore seam, and it is difficult to effectively drill into the ore seam, so that the formed alkali brine concentration is low, and the utilization of seam resources 2) This type of mine layer has thin recoverable layers and many interlayers. The combination of conventional vertical wells and horizontal wells can only exploit one initial mining layer. If other initial mining layers are to be mined, more well groups must be established to Mining other first mining layers not only consumes a lot of time and engineering costs, but also takes up more land resources

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