RU2170821C1 - Method of hydrodrilling mining of thin and medium thickness beds - Google Patents

Abstract

FIELD: mining industry; applicable in mining of thin and medium thickness beds with dip angle above 4 deg. SUBSTANCE: method includes driving of development workings and stoping by hydrodrilling method with pulp transported hydraulically. Mineral is extracted in three stages. At the first stage, pilot parallel ventilation holes are sunk by hydrodrilling method along strike of pillar with diameter of 100-200 mm spaced at distance along length equaling sum of sizes of well reamer radius and pillar width ensuring hole preservation for time of stoping. At the second stage, muck is withdrawn due to expansion of hole through full thickness of bed. In this case, water is supplied from ventilation working and introduced into hole is high-pressure hose with nozzle secured to operating set. At the third stage, pillar is recovered during reverse running of operating set by hydraulic jet at pressure of 5-6 MPa. Washing off of muck is effected through preserved hole. EFFECT: higher efficiency and safety in mining, reduced energy input in stoping and development processes. 4 dwg

Description

The invention relates to the mining industry and can be used in the development of thin and medium thickness formations with an angle of incidence of more than 4 ^o .

 There are known open and underground brown screw methods for the development of shallow seams (Kryuchkov V.V.Buroshnekova coal mining in quarries of the United States. - M .: TsNIIITEIUP. Series "Mechanization and automation of coal mining and concentration", 1963. - 47 pp., Yatskikh V.G. ., Imas A.D., Spektor L.A. Mining machines and complexes. - M. Nedra, 1974. - P.108-109), including ventilation and accumulating workings or the use of the side of the cut, the cleaning excavation of the mineral using the burosnekovym method , its unloading by auger and transportation by workings in a mechanized way.

 The disadvantage of this method is the large size and metal consumption of mining machines, high energy consumption of production and a small well length of 40-60 m

 A well-known drilling method for the development of thin steep formations (Yatskikh V.G., Imas A.D., Spektor L.A. Mining machines and complexes. - M .: Nedra, 1974. - P. 99-106), including ventilation and accumulating workings, drilling a mineral well with a small diameter and expanding it with a direct or reverse stroke.

 The disadvantage of this method is the increased risk of mining and the possibility of a gas explosion in the well.

 A known method of downhole mining of minerals (Unconventional solutions in the mining industry. / Ed. Yu.A. Chernegova. - M .: Nedra, 1991. - S. 215-274), including borohydraulic drilling of wells, hydraulic excavation of minerals and hydraulic transportation of pulp to the surface.

 The disadvantage of this method is the high energy consumption of hydraulic transport and low productivity of the hydraulic excavation, which is a flooded stream.

 The closest technical solution adopted for the prototype is a method of developing reservoirs with hydromonitor units (AGS hydromonitor unit, GVD-3 hydromonitor unit) (A.Ya. Kodentsev, Hydraulic technology in mines. - M .: Nedra, 1994. - P. 42- 49), including carrying out ventilation and accumulating workings, excavation of minerals by hydraulic destruction by swaying or rotating streams, hydraulic washing, transportation of the rock mass along the workings.

 The disadvantage of this method is the high energy consumption for hydraulic destruction of the array.

 The aim of the invention is to increase production efficiency and safety of work, reducing the energy consumption of treatment and preparatory processes due to redistribution of rock pressure in time and space, volumes of installation and dismantling work, additional supply of low-pressure water to flush the rock mass into the wells from the upper horizon and improve quality airing.

 This goal is achieved in that in order to ensure ventilation due to mine depression, additional water supply for flushing the rock mass, unloading the rock mass and preserving the specified direction of the treatment wells, the extraction of minerals is carried out in three stages: in the first, the leading parallel ventilation wells are stretched along the strike in the hydrohydraulic way a column with a diameter of 100-200 mm with a step in length equal to the sum of the dimensions of the radius of the borehole extender and the width of the pillar, ensuring the safety of the well at the time of the treatment dredging, in the second, the dredging of the rock mass is carried out by expanding the borehole to the full capacity of the formation, while water is supplied from the ventilation outlet, and a high-pressure hose with a nozzle mounted on the stand is put into the borehole, then the pillar is hydrated in the third stage a method under a pressure of 5-6 MPa, with a reverse stroke, and flushing of the rock mass occurs through a preserved well.

 In FIG. 1 is a general view of conducting a leading well; FIG. 2 - conducting leading wells, top view: FIG. 3 - extension of the leading well, top view; FIG. 4 - hydraulics, rear view of the rear sight.

 The method of hydro-hydraulic development of thin and medium thickness formations is as follows.

 At the first stage, 2-3 leading leading wells 4 with a diameter of 100-200 mm are drawn from the accumulation hole 1 to the ventilation hole 2 (Fig. 1) by the hydro-hydraulic installation 3, with a step equal to the sum of the dimensions of the radius of the borehole expander 5 and the width of the pillar 6, which ensures well preservation for the period of extraction (determined by the VNIMI method), which allow ventilating the workings due to mine depression, which increases production safety, maintains the specified direction of drilling during expansion of wells and per distribution of ground pressure at later stages.

 At the second stage, the well 4 expands to the thickness of the reservoir 7, while the pillar 6 remains, ensuring the safety of the expanded well until its maturity. When expanding, a high-pressure hose 8 with a nozzle 9 is inserted during expansion, fixed on the rig 10 of the drilling rig 3. The washed-out rock mass is washed off with water, which is supplied to the well 4 from the low-pressure pipeline 11 of the ventilation output 2, and the pulp is transported by the gutter 12.

 At the third stage, the rock mass of the pillar, which is located in the zone of reference rock pressure, is destroyed and washed out with a hydraulic jet of nozzle 9 of an average pressure of 5-6 MPa, which reduces the energy consumption of fracture and increases the production rate, and additional water is supplied to flush the broken rock mass pipeline 11, which also leads to lower energy consumption and increased productivity of coal extraction.

Claims (1)

 The method of borohydraulic development of thin and medium thickness strata, including carrying out preparatory workings and mining excavation of the rock in a hydrohydraulic way with pulp hydrotransport, characterized in that for ventilation due to shaft depression, additional water supply for flushing the rock mass, unloading the rock mass and maintaining a given the direction of the treatment wells, the extraction of minerals is carried out in three stages: in the first, the leading parallel is carried out by the hydrohydraulic method ventilation holes along the strike of a column with a diameter of 100-200 mm with a step in length equal to the sum of the dimensions of the radius of the reamer of the well and the width of the pillar, ensuring the well’s preservation for the duration of the treatment excavation, the second excavation of the rock mass is carried out due to the expansion of the well at full capacity water is supplied from the ventilation outlet, and a high-pressure hose with a nozzle mounted on the stand is put into the well, with the help of which, at the third stage of the stand, the pillar is repaid by hydraulic sp especially at a pressure of 5-6 MPa, and the flushing of the rock mass occurs through the remaining well.

Images