RU1818520C - Method for producing underground cavities by blasting - Google Patents

Abstract

The invention can be used to create underground reservoirs and chambers for storing gases, oil products or production waste, during expansion and drilling of wells, and also when cutting gaps in them. The purpose of the invention is to increase efficiency through controlled internal spall fractures of the rock. The components of liquid explosive mixtures are alternately pumped from the bottom of the well into the rocks. Then, a liquid blast initiator is supplied to the treated surface of the well. If the rocks are gas-saturated or contain natural liquid, the method provides for their preliminary degassing or drainage. 2 ill.

Description

The invention relates to the mining industry and can be used to create underground reservoirs and chambers for storing gases, oil products and production waste, when expanding and drilling wells, and also when cutting gaps in them.

The aim of the invention is to increase the efficiency of the method due to controlled internal spall fractures of rocks.

In FIG. 1 shows a section through a well with an explosive mixture supply system therein; in FIG. 2 - cavity contour formed by the explosion of an explosive mixture.

The method includes the following operations. Drill a well 1 and casing it with a casing 2. A system of pipes is placed inside the well for supplying to the lower part

wells of the liquid components of the explosive mixture: liquid oxidizer through the tube 3, liquid fuel through the tube 4 and the liquid initiator of the explosion through the tube 5. Then, alternately through the device 6, the liquid components of the oxidizer and the combustible explosive mixture are injected into the rocks, the liquid initiator of the explosion is fed to the open surface of the well , for example, by spraying or spraying and creating a cavity 7.

Example. The method was implemented when creating a cavity in a production well for performing slotted discharge of the productivity of a gas-bearing formation. The borehole zone of the gas-bearing layer was degassed. A cavity was cut to increase its permeability. Initially, into the reservoir through the pipe and bottomhole.

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the device was injected with a liquid oxidizing agent, in which case a solution of ammonium nitrate was used. Then, liquid fuel was injected into the formation, which was used as diesel fuel. After liquid components of the explosive mixture were injected into the reservoir to the well surface through a hydraulic drive system and a Hook hinge, on which a corrugated rod is mounted, a liquid initiator of the explosion was sprayed on the treated surface of the well. By initiating micro-explosions on the open surface of the well, a cavity was formed to the depth of impregnation of mountain ore.

Claims (1)

SUMMARY OF THE INVENTION A method of creating an underground cavity by blasting, including drilling a well in a rock, injecting liquid oxidizer and fuel into the well, and initiating an explosive mixture, characterized in that, in order to increase efficiency due to controlled internal spall fractures of the rock, liquid oxidizing agent and fuel are injected under pressure into the rock surrounding the well, to the depth of the rock impregnation, while the initiation of the explosive mixture is carried out by a liquid initiator of the explosion, which is sprayed m on the inner surface of the well. 0