SU1654578A1 - Method of borehole hydromining - Google Patents

Abstract

The invention relates to mining and m. used in downhole hydraulic mining of ores of high power. The goal is to increase the efficiency of downhole hydraulic production by ensuring the safety of mining operations and reducing the loss of minerals in the subsoil. From the surface, drilling and auxiliary wells are drilled through the drilling units (C). In operational C place hydrophobic equipment. Through hydromonitor begin hydraulic erosion of the mineral in the block. The eroded part of the ore in the form of pulp is discharged to the surface. Simultaneously with the onset of erosion, a hydraulic erosion is carried out along the boundary of the overburden and ore body (PT) and the overburden. The auxiliary C is continuously fed with a hardening mixture. The latter fills the formation at the border of the RT and overburden and prevents the overburden from moving into it. The pressure of the mixture in the cavity is maintained equal to the rock pressure of the surrounding rocks. il yo

Description

The invention relates to mining and can be used in mining by the method of borehole hydraulic mining of high power ore deposits with low mechanical strength, occurring under unstable covering rocks.

The purpose of the invention is to increase the efficiency of downhole hydraulic production by ensuring the safety of mining operations and reducing the loss of minerals in the subsoil. The drawing shows a pattern of erosion of the ore horizon and bookmarks formed in the cavern roof, implementing the proposed method, vertical section

The method is carried out as follows.

From the surface of the field, drilling units 1 drill operational 2 and auxiliary 3 wells. Operational 2 wells are drilled to the soil of the productive ore body (horizon) 4. Auxiliary wells are drilled and planted to the top of the productive horizon

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4. In production wells 2, hydroburning equipment is placed 5. Hydraulic monitor 6 is installed near the soil of the productive horizon 4. Hydraulic erosion of the mineral is started within block 7. The eroded part of the ore is pulped to the surface. Simultaneously with the beginning of erosion, in the auxiliary wells 3, a hydraulic fracture is carried out along the boundary of the overburden and ore body 4 and the overburden 8.

In the process of erosion of the mineral from the soil of the ore body 4, excavation chambers 9 are formed, into which the ore is transferred from the block of rocks. If the roof of the ore body 4 above the chamber being worked is under excessive pressure (fracturing pressure), then when the zone of collapse reaches the roof, further movement of the zone of collapse into the covering mass will stop. From this moment on, a hardening mixture begins to be supplied to the auxiliary wells 3, which fills the cavity 10 formed on the border of the ore body and overburden 8 and prevents the overburden from moving into it. The pressure of the hardening mixture in the cavity 10 is maintained no more than the rock pressure in the surrounding rocks. This reduces the likelihood of a breakthrough of the hardening mixture through the ore mass 11 moving into the developed space, and at the same time prevents the displacement of the overburden into the cavity.

Such an order of erosion and simultaneous laying of a cavity formed in the process of ore extraction provides the most complete extraction of the mineral from the chamber and preservation of the overburden in a stable state for the entire period of mining. The mining process is carried out until the ore is completely removed and the entire developed space 12 is filled with a hardening mixture. The volume of hardening mixture supplied to the chamber is set to not less than the volume of the extracted mineral. This ensures the steady state of the overlying rocks both in the process and after the completion of mining operations, since there are no voids in the depths

Select the filling mixture, start

hardening which occurs after the erosion.

Claims (1)

Method of borehole hydraulic extraction of minerals, including drilling production and auxiliary wells, conducting fracturing between wells with the formation of a cavity at the border of overburden rocks and ore body minerals within the boundaries of excavation chambers and their release to the surface, characterized in that, in order to increase the efficiency efficiency of borehole hydraulic mining by ensuring the safety of mining operations and reducing mineral losses, moving the block of rocks within the boundaries of the mining chambers by simultaneously conducting hydraulic fracturing and eroding the rocks and expanding the hydraulic fracturing cavity by hydrating the soil of the ore body and pumping hardening mixture produced continuously, while the pressure of the mixture in the cavity is maintained equal to the rock pressure of the surrounding rocks, and as a hardening mixture is used with A hardening rate exceeding the time required for the extraction chamber. Liquid pressure pump / b Cover plate.