SU68290A1 - The method of drilling mines with the pilot wells - Google Patents

Description

Methods for drilling mines using pilot wells are known.

According to the proposed method, after each successive recess of the pilot well, the drilling tool for lifting the latter is raised and a explosive body, such as a torpedo, is lowered into the pilot well.

After the explosion, the torpedoes actuate a tool for drilling a mine of the intended diameter along the undermined rock, which considerably facilitates and accelerates drilling.

FIG. Figure 1 shows a pilot well drilling device in section, after drilling before explosion; in fig. 2 shows a sectional view of a pilot well with a raised drilling tool and an explosive projectile trimmed into the well; in fig. 3 is a sectional view of pilot boreholes after an explosion.

The boring tool consists of a drill pipe / n the drill bit 2.

Above the bit there is a working tube 3 with two rows of crackers (splines) 4. The working tube rotates freely inside the rolling roller bit 2. The roller bit consists of a body 5 connected to two coupling sleeves — the upper 6 and the lower 7. These sleeves have two a number of grooves - through 8 and incomplete 9. Case of 5 bits was ground with an axis of 10 slopes //. On the axle they sit on roller bearings of the cutter 12 of various diameters. In the absence of backwash, a sludge pipe 13 is mounted above the bit, periodically cleaned on the surface.

When the shaft bit is lowered into the shaft, it lies on the bottom, and the bit 2 drills the pilot hole M. After the pilot hole is drilled, the pipe 3 together with the bit 2 rises and is installed on the elevator, and the torpedo 15 passes inside the pipe 3 (or outside) (Fig. 2) with a fuse 16 falling into a pilot well. Following the passage of the torpedo tool lifted to a safe height. The torpedo explosion destroys the rock to the diameter of the mine (Fig. 3). After the explosion, the mine chisel is lowered into the face. With a slight twisting of the tool, the splines 4 are inserted into the incomplete grooves 8 and these engage the COLUMN

No. 68290

pipes with a shaft chisel to rotate and additionally press a column pipe on it. Slow rotation (10–30 rpm) of the shallow dredging grinds the crushed rock, and intensive flushing ensures that this crushed rock is carried to the surface.

Subject invention

A method of drilling mines using a pilot well, characterized in that after each subsequent recess of the pilot well, the drilling tool for lifting the latter is lifted, a projectile, such as a torpedo, is lowered into the pilot well and, after the explosion, the drill tool is drilled target diameter for undermined rock.