SU1550143A1 - Method of excavating materials from thick saturated levels - Google Patents

Abstract

The invention relates to geology and mining, and can be used in testing powerful productive horizons (GHGs) and in well hydroproduction of minerals from them. The goal is to reduce the dilution of the material being taken while simultaneously increasing its volume. Wet wells are drilled from the earth's surface with water (PG). In C, a borehole hydrophobic aggregate is placed, with the help of which the rocks are preliminary washed out with the formation of a excavation chamber (VC) with a radius equal to the limiting stability radius of the rocks and leaving a pack of SG rocks above the VC. Simultaneously with the recess of the VC, additional C of small diameter are drilled along its contour. The charges of explosive are placed in them. After excavation of the VC, the downhole jetting unit is withdrawn from C for a given radius. The explosions of the charges bring down the rocks of the walls of the VK with the removal of rocks into it. Simultaneously with the removal of rocks from the side of the walls of the VC, a pack of PGs, left on the VC, collapses into it. Uniform subsidence of the earth’s surface below the groundwater level occurs. On the surface of the water place the floating facility. Then the layer of deposited rock is drilled and further erosion is carried out. 2 Il.

Description

The invention relates to geology and mining and can be used in testing powerful productive horizons, as well as in the downhole hydraulic mining of minerals from them.

The purpose of the invention is to reduce the dilution of the recoverable material while simultaneously increasing its volume.

FIG. 1 and 2 are diagrams illustrating the sequence of operations of the proposed method.

Example. The rock mass is extracted from powerful water-cut horizons 1, which are pre-opened by well 2 to the bottom extraction point. Then, using well hydrodynamic unit 3 located in said well 2, a preliminary circular erosion is carried out with formation of excavation chamber 4 leaving a pack of 5 watered horizon 1 rocks above specified excavation chamber 4, while erosion

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The rocks in chamber 4 are produced before its radius reaches the limiting stability radius of the rocks, i.e. with provision of a temporary steady state of chamber 4. Simultaneously with the recess of chamber 4, additional small diameter wells 6 are drilled along its contour, in which explosive charges are placed, and the charges are located within the lower 2/3 of the chamber 4 height. After the recesses of the chamber 4 at a given radius extract the CS of the well 2, the borehole jetting unit, and transfer the ground equipment to the safe zone. Following this blasting of charges in the wells b, the rocks of the walls of chamber 4 are brought down with the rocks removed to the last. Simultaneously with the removal of rocks from the side of chamber 4, a bundle 5 of the productive horizon that was left above chamber 4 collapses into it, and the earth’s surface is evenly settling below the groundwater level, and there is no significant disturbance in the distribution structure of the overburden and the location of the productive horizon pack.

A ground based installation is placed on a floating craft and brought to the surface of the groundwater, after which a layer of deposited overburden and overburden of watered horizon 1 is drilled down to the lower extraction level. When a well is drawn, a protective casing is installed in it, and then a borehole hydropower unit 3 is inserted into the well and with it at the lower extraction point a circular erosion of the overburden of rocks is carried out with its collapse into the suction zone of the hydroproduction unit 3, in particular the airlift, and hydraulic lift

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rock mass to the surface. Excavation of the rock mass is carried out until overburden begins to emerge during the hydraulic lift of the pulp. Thereafter, the downhole jetting unit 3 is removed from the column, and then the column is lifted for subsequent use.

Due to the constant location of the base unit on a floating facility located at a stationary level, the excavation is carried out independently of rock movement with high reliability and safety, which guarantees at the same time the possibility of extracting a large volume of rock mass from the productive horizon.

Claims (1)

Invention Formula five 0 A method of extracting materials from powerful watered horizons, including drilling a well from the earth's surface, placing a borehole hydropower unit in it, pre-washing the rocks with a hydraulic lift of the rock mass, collapsing the rocks, and further washing the rocks of the horizon, characterized in that, in order to reduce the dilution material while increasing its volume, the preliminary erosion is carried out with the formation of a excavation chamber with a radius equal to the limiting stability radius of the rocks, and leaving packs of horizon rocks, additional wells are drilled along the contour of the chamber, collapse of the chamber walls and packs are carried out by blasting charges in additional wells with subsidence of the earth's surface below the groundwater level, float is placed on the surface of the water, which is further eroded after drilling settled rocks0 0 five ti ,eight L figure 1 (rig 2