SU1346798A1 - Method of hydraulic excavation of materials from underground formations - Google Patents

Abstract

The invention relates to mining and geology and m. used in downhole hydraulic mining of minerals and in testing powerful productive horizons. The goal is to increase extraction efficiency by preventing the rocks from moving. The formation is opened by the well and mining is carried out in layers in a descending order. Within each layer, ellipsoid in terms of chambers are dredged with the help of a downhole monitor. After working each overlying layer with the formation of the chamber and pulp on the surface in the developed space serves hardening material. After they gain strength in the overlying layer, they start working out the chamber in the underlying layer. Cameras work with the mutual displacement of the major axes of ellipses. Due to the mutual displacement of the chambers in the adjacent layers, the peripheral zones of the array of hardening bookmark in each layer are supported on the pillars. The height of each layer takes more than the height of the block stops in the pillars between unidirectional cameras. 1 hp f-ly, 2 ill. (L 00 4 and QP 00

Description

one

The invention relates to mining and geology and can be used in downhole hydraulic mining of mineral resources, as well as in testing powerful productive horizons.

The purpose of the invention is to increase the recovery efficiency by preventing the rocks from moving.

Figure 1 is a diagram illustrating the sequence of mining layers; Fig. 2 shows excavation chambers in layers, a plan view.

The formation is opened by the borehole 1, the mining is carried out in layers in a descending order, while within each layer using the borehole jetting unit 2, chambers are elliptical in terms of chambers, chamber ellipses in adjacent layers are displaced relative to each other, preferably by 90 ,

After working out each overlying layer with the formation of chamber 3 and discharging pulp to the surface, hardening material is supplied to the developed space (the same materials that are widely used in mining, for example, cement-based slag waste, waste processing plants mixed with cement, etc. .)

Following the curing of the material in the overlying layer, they start working on the chamber 4 in the underlying layer. After this, the operations are repeated. By displacing the ellipsoid chambers in adjacent layers relative to each other, for example, 90 peripheral zones of the array of hardening bookmark in each layer are supported on the pillars 5. This ensures the stability of the whole structure of the hardening bookmark and, consequently, the stability of rocks in the chamber in which the incision is made. So, for example, even if the collapse of the rocks of the pillars 5 into the excavation chamber occurs, then, firstly, the stability of the structure and chamber will be ensured by the backfill array in the underlying layer resting on the pillars 6 of the formation massif, and, secondly, Collapsed rocks of the pillars 5 can be washed out by the stream under the protection of the monolith of the bookmark in the lower layer below and are laid out on the surface

However, since the development of formations of subtle power, the collapse of the pillars is impractical because

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Due to the fact that the entire weight of the construction of the bookmark is transferred to the backfill monolith in one layer, the height of each layer is taken more than the height H of the block 7 of the abutment in the pillars between unidirectional chambers (in this case, in the pillar 5 between chambers 3). The height of the block is determined in each case on the basis of experimental experiments.

If necessary, the left pillars can be worked out when excavating adjacent blocks. In this case, the previously created structure of hardening material serves as a supporting structure.

It is possible to perform several options for filling chambers with hardening material. In the first embodiment, the well jetting unit supplies the end of the drill bit and, after the material has hardened in the layer, the cement plug 25 is drilled by rotating the unit and deepening it after the cement bridge passes into the underlying layer. A variant is also possible with preliminary placement in the borehole within the laying layer of the inflatable casing, which is removed after the material hardens. When using the casing, its lower part should be placed in the well and partially within the lower layer to prevent the solution from entering the well below the underlying layer. Other options for filling the developed space with hardening material are possible, for example, through peripheral wells.

At the same time as filling up the developed space, it can be constantly judged on the change in the volume of the developed space by the consumption of hardening material, which is important when testing

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Claims (2)

1. A method for the hydraulic extraction of materials from subterranean formations, including opening the formation with a well, placing a downhole jetting assembly therein, scouring the rocks layer by layer from top to bottom, forming a digging chamber, pulping the surface and filling the spent chamber with hardening material, characterized in that In order to increase extraction efficiency by preventing the rocks from shifting, each layer is worked out by elliptical chambers in plan, and the chambers work with the mutual displacement of the major axes of the ellipses, and the height of each layer takes more than the height of the stop block in the pillars between unidirectional chambers. 2. The method according to claim 1, which is different with the fact that the cameras work with the mutual displacement of the major axes of the ellipses by 90. ; g o. -. .-about..-: .., / o -.0; ABOUT . Fy 2