RU2081324C1 - Method for hydraulic bore-hole mining of minerals - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: productive level of deposit is exposed by production bore-holes and mining is effected by hexagonal cells with removing chambers of first and second stage. Chambers of first stage are worked in the form of vertical slots in counterdirection over perimeter of hexagonal cell. After working-out of chambers of first stage and their filling through perforated operating tubes, chambers of second stage are being worked under protection of artificial pillar. EFFECT: high efficiency. 2 dwg

Description

 The invention relates to the mining industry and can be used in the development of mineral deposits by geotechnological methods.

 A known method of downhole hydraulic production, including opening a deposit by production wells, installing production equipment in them, sinking slot workings between wells, excavating a mineral to form pillars a. from. USSR, 611001, class E 21 C 41/04, 1978 /.

 The disadvantage of this method is the large loss of minerals in the pillars.

 There is also known a method of extracting materials from underground formations, including opening the formation with wells, equipping them with production units, with a pulp-dispensing column, cementing the annular space of the pulp-dispensing column and excavating the mineral under the protection of an artificial pillar.

 The disadvantage of this method is the relatively small volume of chambers that can be worked out under the protection of such a pillar and, in addition, discharges from the walls of the chamber are possible with unstable mineral / a. from. USSR 1317129, class E 21 C 45/00, 1987 /.

 There are other known methods of developing mineral deposits borehole hydraulic mining, carried out under a pre-fortified roof (a.p. 1328524, class E 21 C 45/00, 1987).

 The disadvantage of all of these methods is that during the development of unstable minerals, discharges from the walls of the chambers are possible.

 The closest in technical essence and the achieved result is a method of downhole hydraulic mining of minerals from horizontal and dipping deposits, including opening the deposits in rows of production wells, installing production casing in them, and hydromonitor units, developing a deposit with excavating the mineral by first-stage cameras and forming between them the pillars of the hexagon in terms of shape, lowering the chambers of production casing to the soil, their perforation and laying the worked out space harder boiling mixture drilling of wells and pillar mining minerals recess chambers second queue protected artificial pillars (a. s. USSR 1317133 Cl. E 21 C 45/00, 1987 YG).

 The disadvantage of this method is that at the junctions of the first-stage chambers, made in the plan of a triangular shape, the thickness of the filling array is minimal and, with unstable minerals, dumps from the walls of the chamber with the collapse of the bookmark are also possible, which will lead to dilution of the ore with filling material.

 The aim of the invention is to increase the stability of the processed chambers while reducing the consumption of hardening material.

 This goal is achieved by the fact that in the known method of borehole hydraulic mining of minerals from horizontal and dipping deposits, including opening the deposits in rows of production wells, installing production casing and hydromonitor units in them, developing a deposit with mining the minerals by first-stage cameras and forming hexagonal pillars between them in terms of form, lowering the chambers of production casing to the soil, their perforation and laying of the worked-out space with a hardening mixture, drilling trees by mining wells and the extraction of minerals by the second stage cameras under the shield of artificial pillars, the development of the deposit is carried out by hexagonal cells, the first stage cameras are worked out in the form of slots with parallel or diverging walls opposite to the sides of the hexagon, while the production cores are perforated before filing the bookmarks, and the hardening mixture is fed through a perforated column, which is then used as a reinforcing element in the filling array.

 The aggregate includes all the essential features, each of which is necessary, and all together are sufficient to achieve the goal.

 In FIG. 1 shows a fragment of the developed section of the deposit, a plan view; in FIG. 2 section along aa of figure 1.

 The method is as follows. The productive horizon to be mined for reservoir 1 is opened in parallel rows of production wells 2, the development of reservoir 1 is carried out by hexagonal cells 3 with the extraction of minerals by the cameras of the first 4 and second 5 stages.

The cameras of the first stage 4 work out in the form of vertical slots 6 with parallel or diverging to the periphery walls of the counter-directed along the sides of the hexagon, outlining the pillar 7 of the mineral. From each production well 2 work out three chambers located at an angle of 120 ^o . The length of each chamber is half the length of the side of the hexagonal cell 3, the height of the chamber does not exceed the thickness of the productive horizon of deposit 1, and the width is determined by the stability of the ore mass.

 After extracting minerals from the three chambers and dismantling the mining equipment from well 2, the casing string is perforated, for example, with a zero perforator, lowered to the chamber soil, and a hardening mixture is fed into the well 2 through the perforated column. Perforation can be performed after lowering the column.

 After filling the worked-out space with a hardening mixture, the perforated column is not removed and it acts as a reinforcement in the hardening tab.

 When the extraction and laying of all the chambers of the first stage is completed and the hardening mixture has gained the specified strength, they begin to excavate the pillar 7 by the second stage camera 5. To do this, drill a well 8, install mining equipment and perform hydraulic erosion of the mineral with the formation of formed pulp 9 to the surface. Depending on the conditions, the extraction of the second stage chambers can be carried out both from top to bottom and from bottom to top, in a drained or flooded face.

 With a large reservoir power or mining steeply falling deposits of an isometric shape, for example, kimberlite pipes, floor development is possible.

 Since the extraction of the cameras of the second stage is carried out under the protection of the artificial pillar created by mining and laying the cameras of the first stage 4, the volume of the cameras of the second stage 5 can be significantly increased by increasing the linear dimensions of the pillar 7.

 After the extraction of minerals in the chamber of the second stage 5, it is laid with bulk material.

Claims (1)

 A method of downhole hydraulic mining of minerals, including opening a deposit in rows of production wells, installing production casing and hydraulic monitor units in them, developing a deposit with excavating the mineral by first-stage cameras and forming hexagonal pillars between them, lowering the production casing to the soil, perforating and laying of the worked-out space with a hardening mixture, drilling of pillars with production wells and excavation of minerals with second-stage cameras under the protection of the suit pillars, characterized in that the development of the deposit is carried out by hexagonal cells, first-stage chambers are worked out in the form of slots with parallel or diverging walls opposite to the sides of the hexagon, while the production cores are perforated before the bookmark is fed, and the hardening mixture is fed through a perforated column, which further used as a reinforcing element.

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