SU1293347A1 - Method of recovering materials from underground formations through wells - Google Patents

Abstract

The invention relates to the field of geology, mining and construction. The goal is to increase the efficiency of extracting materials from the lifting formations by reducing the water inflow into the excavation chamber and eliminating the flow of fluids into it from the aquifer located above the formation. The formation is opened by mining and drilling wells. The latter are cased and cemented to lead the casing strings to the upper layer of the formation, which is entirely protective. A water well is drilled to the boundary between the formation and watered rocks between the cumulative and the producing wells and is equipped with a water intake filter and airlift or well pump. Water is pumped out of the well to form a depression funnel. Due to the discharge of the aquifer over the whole and above the formed chamber, the water inflow into the chamber is sharply reduced or eliminated. This allows the erosion of rocks in a free stream. Pumped water from a water well is used as a pressure agent for scouring the chamber. When the chamber is eroded, its contours must be within the depression funnel. 1 il. §

Description

The invention relates to the geology of mining and construction and can be used to extract materials from subterranean formations through wells in the presence of watered rocks above the formation.

The purpose of the invention is to improve the efficiency of material extraction from subterranean formations by lowering and inflowing water into the excavation chamber and eliminating the breakthrough of fluvine into it from the aquifer located above the formation.

The drawing shows the general mining management system.

The method is illustrated by the example of testing a thick formation 1, represented by dense clays. Formation 1 is opened by the mining 2 and the production 3 wells. In doing so, the squalls 2 and 3 are cased and cemented with casing strings brought into the upper layer of the formation 1, which is entirely 4, separating the mining operations from aquifer 5 represented by sand and gravel.

Then a water intake well 6 is drilled to the boundary between formation 1 and overflowing watered rocks, and Squigin 6 is drilled between wells 2 and 3 and equipped with a water intake filter and airlift or a well pump.

In wells 2 and 3, a hydromonitor aggregate 7 and a pulp-lifting column 8 are placed. Before the scouring of the chamber 9, which is located under whole 4, from the well 6, pump out the water in the tank, connected to the pump-power unit of the unit 1, to form a depression funnel 10, Due to the formation of this funnel 10, whose center is located between wells 2 and 3, the aquifer 5 at wells 2 and 3 and above chamber 9 is unloaded, which is formed by washing the rocks with aggregate 7 and with the pulp on the surface along the column 8. Bla godar unloading

Aquifer 5 directly at wells 2 and 3 above the whole 4 and, respectively, above the formed chamber 9, dramatically reduces or eliminates the water inflow into chamber 9, which allows the rocks to be diffused with a free stream. At the same time, the likelihood of the quicksand breaking into chamber 9 from the aquifer 5 is minimized. When the chamber 9 is eroded, its contours should be within the limits of the distribution of the depression funnel 10.

Thus, the proposed method makes it possible to drastically reduce or eliminate all the water inflow into the excavation chamber and prevent flooding of the breakthrough into it. At the same time, the water pumped out from the water intake well is used as a pressure agent for scouring the chamber.

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Claims (1)

Invention Formula A method of extracting materials from subterranean formations through wells, including opening the formation of a production and a lateral well with their casing and cementing, drilling a water intake well, washing out the formation rocks of a well drilling machine placed in a production well, and dispensing pulp to the surface on the pulp-lifting column installed by the B of the producing well, characterized in that, in order to increase the efficiency of material extraction from subterranean formations, by reducing the water inflow into the excavation chamber and excluding the breakthrough of floats into it from the aquifer located above the formation, the water intake well bore between production and production wells to the boundary between the formation and overlying water-bearing rocks, while the rear pillars are left above the chamber, and when the chamber is eroded, its contours are located within the depressed funnel of the water intake well.