RU2443965C1 - Method for forming hose charge in wells - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method for forming hose charge in wells involves well drilling, arrangement of hose charge in it and stemming by means of inert materials. At that, hose charge is made in the form of a spiral wound on thin-wall perforated plastic pipe, with winding pitch equal to 4.0…5.0 diameters of hose charge. Hose charge and detonating cord is attached to thin-wall perforated plastic pipe. After the assembled structure is arranged in the well, cavity of the pipe and gaps between coils of hose charge are filled with water to the level of hose charge and the well is stemmed with inert materials.

EFFECT: reducing the specific flow of an explosive, increasing the crushing efficiency of rock masses, and reducing the dust loading of ambient air.

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Description

The invention relates to the field of drilling and blasting and can be used in various fields that use blasting in rock massifs of rocks, in particular with an open method of developing mineral deposits.

Known methods for the formation of borehole charges of explosives (BB) using continuous charges of explosives, detonating cord, electric detonators (see Kutuzov BN Blasting operations. M .: Nedra, 1989. - S.316-318). The disadvantage of these methods is the high specific consumption of explosives and the low efficiency of crushing rocks.

Closest to the claimed is a method of forming a borehole explosive charge of the simplest composition of the Igdanit type (see RF patent No. 2084816, IPC F42D 3/00, publ. 20.07.97). A hose charge is lowered into the well, to which an intermediate detonator with a detonating cord is attached. The hose charge consists of granular ammonium nitrate, the intergranular space is filled with diesel fuel in the amount of 5.5 ... 6.0% of the volume of the borehole charge. After placing the hose charge, the well is filled to the design level with granular ammonium nitrate. As a result, the explosion energy is used to the maximum, because the oxygen balance is approaching zero.

The disadvantage of this method is the high specific consumption of explosives, low crushing efficiency of the rock mass and a large amount of dust generated in the atmosphere after the explosion of wells.

The technical result of the invention is to reduce the specific consumption of explosives, increase the efficiency of crushing a rock mass, reduce the dust content of atmospheric air by placing a hose charge in the form of a spiral in the well and filling the empty part of the well with water.

The result is achieved in that the method of forming a hose charge in wells, including drilling a well, placing a hose charge in the well and jamming of inert material, is characterized in that the hose charge is made in the form of a spiral wound on a thin-walled perforated plastic pipe with a winding pitch equal to 4.0 ... 5.0 diameters of the hose charge, while the hose charge and detonating cord are fixed to the plastic pipe, and the pipe cavity and the gaps between the turns of the hose charge are filled with water to a height I charge hose.

The essence of the invention is that in the method of forming charges in wells, including drilling wells, loading their explosives and clogging from inert materials, a hose charge is formed in the form of a spiral by winding it onto a thin-walled perforated plastic pipe with a winding pitch equal to 4.0 ... 5 , 0 hose charge diameters. The hose charge and detonating cord are attached to a thin-walled perforated plastic pipe, for example, using clamps made of knitting wire or tape. After placing the assembled structure in the borehole, the pipe cavity and the gaps between the turns of the hose charge are filled with water to the height of the hose charge and the hole is clogged with inert materials.

The efficiency of crushing a rock mass increases due to the duration of the explosive pulse and the impact of the additional tangential component of the shock wave when it moves along a spiral charge. The specific consumption of explosives is reduced by reducing the explosive charge in the well, and the dustiness of atmospheric air is reduced due to the formation of water vapor from the water present in the well before the start of the explosion.

In FIG. a charged well is shown.

The method of forming a hose charge is as follows.

Before loading the well, a charge is prepared: a hose charge BB 2 and detonating cord 3 are wound onto a perforated thin-walled plastic pipe 1, attaching them to the pipe with clamps, for example, of knitting wire or adhesive tape 4. With a well diameter of, for example, 250 mm, the diameter of the hose charge is 100 mm, respectively, pipe diameter 50 mm, spiral pitch 400 mm. After the manufacture of the hose charge, it is immersed in the well to the full depth, the detonating cord 3 is brought to the surface. Then, through the cavity of the pipe 1, the well is filled with water 5 to the upper mark of the hose charge 2, it is blocked with a waterproofing bridge 6, for example, of polyethylene, and the well is clogged with an inert material 7.

The claimed method of forming a hose charge in wells provides a reduction in the specific consumption of explosives by 1.5 ... 1.6 times, increases the efficiency of crushing a rock mass and reduces the dust content of atmospheric air in the territory of the drilling and blasting operations.

Claims (1)

A method of forming a hose charge in wells, including drilling a well, placing a hose charge in the well and jamming of inert material, characterized in that the hose charge is made in the form of a spiral wound on a thin-walled perforated plastic pipe with a winding pitch of 4.0-5 , 0 to the diameters of the hose charge, while the hose charge and detonating cord are fixed to the plastic pipe, and the pipe cavity and the gaps between the turns of the hose charge are filled with water to the height of the hose charge.

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