Method of blasting upward borehole charging

FIELD: blasting operations.

SUBSTANCE: invention relates to explosive substances (ES) charges formation in wells and can be used during blasting upward boreholes charging, regardless of their watercut degree, on underground mining works for extraction of minerals. Method of blasting upward boreholes charging, including live primer location in well upper part with subsequent well filling with ES and formation, or not, of stemming below ES. In well upper part above live primer drain cavity is created, by arranging plug with drain tube in well, wherein tube lower end, after charge formation, is located below charge.

EFFECT: invention allows to ensure stability of ES charge column under conditions of large water influx.

1 cl

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: bottomhole wad of blasthole charge comprises a cylindrical solid body on the side surface of which in the plane, perpendicular to wad, circular grooves are made. The bottomhole wad is made from carbon fibre-reinforced plastic. The solid body of wad is made in the form of uniform monolithic structure from the material containing 74.8 weight fractions of small coal - small coal, slime, hardened by the cold hardening formaldehyde resin SFZh-3032 amounting 20.6 weight fractions and a hardener amounting 4.6 weight fractions of water solution of technical petrolsulphonic acid. The invention allows to increase efficiency of drilling-and-blasting works in coal mines due to reduction of labour input of processes of fabrication of wads and respectively their prime cost.

EFFECT: invention allows to improve quality of produced coal due to decrease of his impoverishment, the simplified bottomhole wad is suitable for charging of blastholes in automatic mode by respective robots.

4 dwg

FIELD: mining.

SUBSTANCE: method comprises the reception of acoustic signal, its amplification, a filtration, registration and comparison. The tone of sounding of acoustic signal during its loading is compared with reference sound tones from a database, then the compliance of sounding tone with a well information is analysed, the obtained data are registered and using them the explosive supply system is controlled. The device comprises a pneumatic loader with a loading hose, a receiver designed as a microphone, a signal processing system connected to the command device. The signal processing system is fitted with series connected broadband amplifier, a sound filter, a memory and analysing device with the unit of database of reference sounding tones and the demountable information media, an actuation device, an analyser of sounding tones with a setting device and the demountable information media. The command device is fitted with an executive mechanism, a spool with electromagnetic valves and a locking device installed directly on a pneumatic loader at the compressed air inlet or at the explosive outlet from the pneumatic loader to the loading hose. The executive mechanism is connected to the locking device through the spool by means of compressed air supply hoses.

EFFECT: method and the device allow to simplify a design, improve accuracy of measurement and reliability of operation.

2 cl, 2 dwg

FIELD: mining.

SUBSTANCE: method includes tripping in a hole of a flexible polymeric waterproof sleeve for supply of explosive with the closed lower end and initiating device, the subsequent filling of the polymeric waterproof sleeve with explosive materials. In advance a combined polymeric sleeve with the closed lower end is fabricated, the internal surface of which is made of waterproof material, and external - of water-permeable robust fire-resistant material. The combined sleeve is filled with water and during its filling with water it is lowered into the well then it is filled with explosive materials.

EFFECT: method allows to protect explosives, initiation devices and a wave guide from burning out when conducting explosive works on hot masses.

FIELD: mining.

SUBSTANCE: suspension well safety bridge consists of a supporting structure and a suspended part fixed on the supporting structure. The suspended part is made in the form of a composite cylinder made of two semi-cylinders connected with a temporary link, on the inner surfaces of each of which in its upper part facing to a well head there attached is a half cylinder of a smaller diameter perpendicular to the cylinder generatrix. A wedge is inserted between two semi-cylinders of the composite cylinder, and a disc is attached to its base, the diameter of which is compatible with well diameter. Height of the wedge to the disc is bigger than height of the composite cylinder, and width of the wedge together with two halves of the cylinder of smaller diameter and semi-cylinders of the composite cylinder is bigger or equal to 1.1-1.2 of the well diameter.

EFFECT: invention allows improving crushing efficiency of mine rocks.

2 dwg

FIELD: mining.

SUBSTANCE: proposed method comprises removal of covering access rock at blast loosening by charges with air cushion in the charge lower end, mechanical loosening and push loading of rock, its piling and loading by excavator into carriers. Blast holes for access rock are drilled in mineral formation to the depth of air cushion at the charge bottom end. Single blasting is performed in well-by-well manner by the system of nonelectric initiation. Every second or third blast well is drilled in mineral formation of decreased hardness.

EFFECT: higher efficiency of destruction, power saving at mineral loosening.

2 cl, 2 dwg

FIELD: mining.

SUBSTANCE: method comprises drilling parallel rows of wells or holes, placing in them of explosive charges in a staggered manner, distributed with filled gaps. The gap length is equal to the length of the charge. Simultaneous camouflage blasting of explosive charges with the central initiation. Filling the voids left after the explosion with the concrete solution. For forming the bridging array the radius of the explosive charge is defined, the length of the explosive charge. In the upper part at the contact the aquiferous stratum - an array form the locking charge. The gaps are filled with bridging material which is formed with the following composition: in aggressive non-pressure environments - bitumen or tar; in non-corrosive pressure environments - cement; in aggressive pressure environments - bitumen or tar, the radius of the resulting bridged area of crumpling from the charge is additionally determined, the radius of the formed bridged area in the gaps between charges, the distance between drilled wells or holes in the row, the length of the locking charge and radius of the bridged area of cracks.

EFFECT: method enables to improve the efficiency and safety of work.

3 cl, 3 dwg

FIELD: blasting operations.

SUBSTANCE: fill stemming of blast holes with elements of stone material comprises the lower fill part of inert bulk materials over the air gap and the upper combined part. The upper combined part of the stemming is divided into two sections: the lower section with length of up to three diameters of the well, filled with elements of stone material with size of 0.2-0.6 diameter of the well, interstratified with the inert bulk material with the size less than 5 mm, and the upper, filled to the top of the well with the same inert bulk material.

EFFECT: invention enables to improve the efficiency of locking the detonation products in the charging cavity by the combined shortened stemming and to reduce costs for its formation.

1 dwg

FIELD: mining.

SUBSTANCE: invention relates to mining, particularly, to ore breaking. Proposed method comprises drilling the wells, defining the location for live primer for charge direct and inverse initiation by calculations, formatting of elongated explosive charge, fitting the live primer in explosive charge to divide it into two parts, filling the well top with explosive and stemming material and blasting of the well. Explosive charge length is measured and live primer location in charge is defined from the well bottom with due allowance for preset live primer length and volume of explosive in 1 metre of the well by claimed formulae.

EFFECT: higher blast power and efficiency, decreased volume of drill works and specific consumption of explosives.

2 cl, 2 dwg

FIELD: blasting operations.

SUBSTANCE: invention refers to mining, to drilling and blasting operations in mine rocks and can be used in different fields applying blasting operations in mine rock masses, and namely at open development of useful minerals. A suspension well stem is made from a piece of material that is bound with two ropes on the outer side; one end of the first rope is bound with a stiff knot, thus forming the first internal volume, inside which a support is arranged. A transverse support size is by 30-50% less than the well diameter. The other end of the first rope is passed inside through the centre of the material piece and attached to a crossbar at the well head. The second rope is bound with a free knot above the stiff knot, with possibility of its movement along the first rope, thus forming the second internal volume, the transverse diameter of which is by 15-20% larger than the well diameter and one third of which is filled with loose inert material; ends of the material piece are left free.

EFFECT: invention allows reducing specific explosive flow, improving crushing quality of mine rock due to long-term arrangement of detonation products in a charging cavity till complete destruction of mine rock, simplifying the structure and improving structure actuation reliability.

2 dwg

FIELD: mining.

SUBSTANCE: method involves development and temporary workings, drilling of bore pits in the face of the mining slab, charging and explosion of bore pits, removal of crushed rock mass, hydraulic cleaning of the developed slab; bore pits are located in lower row at the distance of 2-3 diameters of the bore pit; every second one is charged with distributed charge; bore pits of each next row are oriented along one line in the ore deposit rise direction. Reduction of losses of crushed ore fine parts is achieved due to creation of chutes on bottom layer of ore deposit; at hydraulic cleaning of the extracted slab, movement of hydraulic mixture consisting of water and ore fine parts is performed along smooth surface of chutes.

EFFECT: improving development efficiency of ore bodies and reducing losses of enriched ore fine parts at hydraulic cleaning of extracted slab.

1 dwg

FIELD: mining.

SUBSTANCE: for realisation of the method, drainage-degassing wells are drilled in zones of higher cracking outside the limits of the prepared mine. Wells are drilled in the bottom-up direction in the close proximity to the profile of the prepared mine. Pumping of gas saturated drainage brines is carried out until the level of the depression curve is set below the horizon of breaking works, and it is maintained at this level for the entire period of mining. Besides, in process of wells drilling the minimum permissible distance to the profile of the prepared mine is accepted as 0.035 m per each running metre of the well.

EFFECT: method makes it possible to increase safety of underground mining works due to reduce amount of arriving fuel gas and natural waters to mines from deep and deposit-adjacent horizons of earth interior.

2 cl, 2 dwg

FIELD: mining.

SUBSTANCE: method includes erection of vertical rising wells onto a drained water-bearing horizon, besides, from each rising well in a point located by 30-50 m below the water-bearing horizon soil, an additional side shaft is cut with a rounding (curve) radius of around 50 m. The side shaft is tunnelled after it reaches drained rocks in direction of the next rising well to the point of exit of the next additional shaft into drained rocks. It makes it possible to create a closed drainage contour and to practically eliminate ingress of underground waters into a protected mine or pit.

EFFECT: reduced ingress of underground waters to minimum permissible values.

2 dwg

FIELD: mining.

SUBSTANCE: method involves collection of underground water to manifold (17) around development zone (26) of ore (8) deposit (7) so that cone of depression (27) is formed owing to operation of rings (14) of upward discharge wells (15) drilled out of drain annular mine working (6). Inflow is supplied from manifold (17) of mine working (6) by gravity via pipeline (18) of development mine working (4) to sump (19) of well shaft (1) for cleaning and accumulation. Then, some part (28) of accumulated inflow is supplied by means of pump (22) of well water drainage via pipeline (21) to surface (9) into closed pipeline (20), and from it to water bearing horizon (3) through pumping wells (10) pre-drilled from surface (9) within cone of depression (27), thus providing such pumping mode that pumping flow rate Q3 is less than pumping-out flow rate Q0, and heads H3 of underground water in the propagation area of pumped water are less than heads H0 out of this area, i.e. they provide the compliance with conditions Q3<Q0 and H3<H0.

EFFECT: providing environmentally safe utilisation of technogenic drainage water.

1 ex, 6 dwg, 1 tbl

FIELD: mining.

SUBSTANCE: proposed invention comprises using uphole of outer string with filtration section aligned with drill string that doubles as protective string that, thanks to high torques can overcome friction forces caused by rock pressure, producing water column in annular space between hoe walls and outer string solid part outer surface equal to the height of column from its sealer to filtration part that kills hydrostatic pressure of local water, and using a controlled gap between outer and drill strings to generated throttling effect of releasing water-sand mix from the bed.

EFFECT: reduced load on drill and outer strings, possibility to control drilling height.

2 cl, 2 dwg

FIELD: oil-and-gas production.

SUBSTANCE: providing of stability of well walls, process controllability of opening of waterbearing formation of operation of two waterbearing formations of one upward drain borehole has become possible ensured by creation of backpressure in annular space of well during all time of its drilling in incompetent rocks and also usage in particular case in the capacity of intermediate string of filtering pipe string. Device for opening of waterbearing stratums in incompetent rocks by upward drain borehole includes drilling rig, rotator, main mud pump, drilling assembly, intermediate string, filtering pipe string and equipment of wellhead, containing conductor, wellhead mandrel, pipes grab, gland, closing sleeve, outlet and shutter. Intermediate string is outfitted by ring, rigidly installed to it at bottom end with ability of installation of sealing ring for overlapping of annular gap between conductor and intermediate string. Device is outfitted by additional boring pump, connected to outlet of wellhead mandrel, and also by nozzle installed at outlet of this branch diametre of which depends on static level of waterbearing formations at wellhead and rotary crane for passing of water into outlet from additional drilling pump.

EFFECT: providing of ability of additional water removing.

3 cl, 4 dwg, 2 ex

FIELD: construction.

SUBSTANCE: method and device for erection of horizontal and drain hole in watered sands is related to mining industry and construction, in particular - to methods and devices for erection of horizontal wells with the help of rotary drilling in watered unstable sands and may be used to dry mineral deposits, industrial sites, to clear heads of underground waters in process of tunneling, construction of buildings with preliminary water drawdown, in erection of horizontal wells of various technical purpose in loose watered soils, also under conditions of high urban saturation. Achievement of result became possible due to maintenance of technological process at permanently maintained pressure of structural flushing liquid higher than pressure of stratal ground waters by 0.3-0.5 atmospheres under protection of stable layer, which is formed by structured flushing liquid on well walls, as a result of which impact of mountain pressure at drilling string is eliminated. Realisation of method is carried out by complex device characterised with availability of mechanical part, including drilling plant, conductor, sealant or drill string, or filtering string and support of vertical excavation, and also hydraulic system of structured flushing liquid pressure provision and maintenance in erected well as higher than pressure of stratal ground waters in periods of horizontal drain hole erection and installation of filters in it, which is made of three functional hydraulic lines.

EFFECT: provision of horizontal drain hole walls stability in process of drilling and installation of filters, increased depth of drilling and diametre of erected well, provision of controlled carryover of sand from layer, preservation of natural soil properties in near-filer zone; increased safety of technological process, increased efficiency of drilling, reduced load at performing elements of drilling plant.

10 cl, 2 dwg, 1 ex

FIELD: mining; construction.

SUBSTANCE: method of horizontal radial drain hole constructing in hard rocks includes vertical shaft sinking and drilling from it horizontal radial drain hole and constructing from its bottom additional vertical shaft. Using both shafts along the full length of horizontal radial drain hole it is located string camouflet charge. After charge explosion there are formed horizontal radial drain hole with area of bund fracturing and then on one side of newly formed horizontal radial drain hole there is mounted surface casing with closer and draining, and on the other - choke. On drained territory there is installed at least one hydro-supervisory well.

EFFECT: reduction of drill footage; reducing of horizontal radial drain hole breakingin terms; rising of its interception ability and ability to make an attendance for dewatering drained territory.

3 cl, 2 dwg, 1 ex

FIELD: mining, particularly to reduce ejection of underground water flowing into mine during mining operations to ground surface.

SUBSTANCE: method involves receiving and collecting of mine inflow, which enters mining zone from cone of depression along mine tunnels; cleaning mine inflow; accumulating thereof in underground water accumulation means and delivering mine inflow into water-bearing seam. Mine inflow is supplied out of cone of depression located outside of mining zone in direction of water-bearing seam depression line to provide water return in operating mine tunnels, wherein distance between lower edge of cone of depression and point of mine inflow supply must be not less than width of mine inflow spreading in water-bearing seam. Mine inflow to be discharged from water accumulation means is supplied to intermediate sump and then is filtered in water-bearing seam due to intermediate sump location in water-bearing seam. Mine inflow is supplied to underground or land-based intermediate sump.

EFFECT: increased efficiency of hydrological regime recovery and improved ecological safety due to landscape conservation and enhanced industrial safety due to elimination of underground gas accumulation in dewatered water-bearing seams.

4 cl, 3 dwg

FIELD: drilling and survey, particularly special methods or apparatus for drilling.

SUBSTANCE: underground system includes drain holes, the first well extending from well drilled from ground surface, mainly from underground excavation interval start to remote end thereof. The system also has a number of side holes extending from the first well. Distance between side hole bottom to well drilled from ground surface may be selected so that it is substantially the same for all side holes to facilitate side hole drilling. Method may also involve uniting two or more drain hole systems within the boundaries of underground zone to provide uniform coverage of full underground zone area. System may additionally have a number of communicating drain hole sub-systems associated with main well drilled from ground surface to reduce ground surface area, which provides access to underground zone.

EFFECT: increased efficiency, provision of uniform coverage of full underground zone area and reduced access area.

54 cl, 10 dwg

FIELD: mining, particularly to prevent underflooding of ground areas to be shifted during underground mining performing.

SUBSTANCE: method involves forming contour trench-like cutoff curtain in ground; creating drainage devices inside the contour and removing water from ground movement trough. The contour trench-like cutoff curtain is arranged along predicted horizontal line of ground surface relief formed after ground subsidence and height mark thereof is higher than that of maximal ground water level in spring. Necessary throughput Q of drainage devices is set on the base of mathematical expressions.

EFFECT: increased safety of underground mineral mining.

2 dwg, 1 ex

FIELD: mining.

SUBSTANCE: method involves collection of underground water to manifold (17) around development zone (26) of ore (8) deposit (7) so that cone of depression (27) is formed owing to operation of rings (14) of upward discharge wells (15) drilled out of drain annular mine working (6). Inflow is supplied from manifold (17) of mine working (6) by gravity via pipeline (18) of development mine working (4) to sump (19) of well shaft (1) for cleaning and accumulation. Then, some part (28) of accumulated inflow is supplied by means of pump (22) of well water drainage via pipeline (21) to surface (9) into closed pipeline (20), and from it to water bearing horizon (3) through pumping wells (10) pre-drilled from surface (9) within cone of depression (27), thus providing such pumping mode that pumping flow rate Q3 is less than pumping-out flow rate Q0, and heads H3 of underground water in the propagation area of pumped water are less than heads H0 out of this area, i.e. they provide the compliance with conditions Q3<Q0 and H3<H0.

EFFECT: providing environmentally safe utilisation of technogenic drainage water.

1 ex, 6 dwg, 1 tbl

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