SU1288301A1 - Core drill for drilling large-diameter holes - Google Patents

Abstract

The invention relates to the mining industry and allows for improved efficiency by accelerating core trimming (K) while simultaneously diving a well. For this, the drill body is made composite. Its inner section (C) 2 is installed in the outer C with the possibility of axial movement. Drill pipe 1I bonded to the outer C 1. In the inner C 2 g (L o 00 00 with a

Description

there is a trimming and holding mechanism K with a tension frame 4 having a pulley 5 on the shaft 6, an emphasis 7 and an endless wire saw (gearbox) 3. It covers the top 8 and bottom 9 elements and the pulley 5, the tension frame 4 is rigidly connected With 2 drills. During drilling, the CP 3 is held in C 2 with a lock. Upon reaching the stop 7 end K fic1

The invention relates to mining and is intended for drilling large diameter wells and mine workings with coring during exploration and development of mineral deposits, engineering exploration, special construction work, etc.

The purpose of the invention is to increase the work efficiency by accelerating the cutting of the core while simultaneously making the well bore.

Fig, 1 shows a core drill, a longitudinal section; FIG. 2 is a section A-A in FIG. 1,

-The core drill for drilling large-diameter wells includes a housing consisting of an outer 1 and an inner 2 sections installed with the possibility of axial movement relative to each other, for example, by means of glits (not indicated). The trimming and holding mechanism of the core is made in the form of an endless wire saw 3 , tension frame 4 with pulley 5, shaft 6 and stop 7, top 8 and bottom 9 guide elements. The decking tool 10 and drill pipe 11 are fastened, for example, by means of a thread with the outer section of the housing. Tensioning frame 4 with pulley 5, shaft 6 and support 7 is rigidly fastened to the inner section of the housing that acts as a core receiver. The pulley 5 is rigidly fixed on the shaft 6, which projects in the direction of the bottom as an abutment 7. The axis of rotation of the shaft coincides with the axis of rotation of the core drill. The upper 8 and lower 9 guiding elements, made, for example, in the form of rollers, are installed respectively in the upper and lower end

The sator releases the working part of gearbox 3, which covers K and cuts it. Under the action of tension forces, the working part of the gearbox 3 moves to the center K. During the trimming of the casing C 1 with a rock-destruction tool 10 under the action of an axial load, it is displaced relative to C 2, producing a further deepening of the wells. 2 Il.

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parts of the core receiver body, the lower guiding elements 9 mounted on hinges rotating in a plane perpendicular to the axis of rotation of the drill. In the lower part of the core receiver body there is a clamp 12 of the wire saw.

Core drill for drilling large diameter wells works as follows.

The core drill is lowered into the well, turned on, supplied with a flushing fluid and created an axial load, bringing the drill to the bottom. During drilling the working part of the wire saw 3 is held in the inner section of the housing with latch 12. When the section 2 is filled with a core to the height at which the stop 7 is inserted into the core core, shaft 6 with the pulley 5 slows down and stops its rotation. At this moment, the guiding elements 8 and 9 and sections 1 and 2 of the housing rotating around the fixed shaft 6 with the pulley 5 begin to wind the rope saw 3 onto the pulley 5 from one side and simultaneously unwind from the other,

As a result of the simultaneous unwinding and winding of the cable saw on the pulley 5, the cable saw 3 moves from the pulley 5 to the guiding elements (rollers) 8 and 9 along a closed line.

The cable saw 3 with guiding elements 8 and 9, under the force of gravity of section 2, tension frame 4 with pulley 5, shaft 6, abutment 7, receives tension, and clamp 12 releases the working part of the cable saw, which covers the core surface and cuts it by means of its own movement and simultaneous rotation around the core along with the rotating core

wet borer. The direction of movement of the cable nile coincides with the direction of rotation of the core drill. Under the action of tension, the working part of the saw KanatHoA moves to the center of the core,

During trimming, the outer section I of the drill casing with rock cutting tool 10 under the action of axial load is displaced relative to the internal section 2, for example, along the splines and produces a further deepening of the well. After the core trimming is completed, a core drill with a core is raised.

Claims (1)

Invention Formula Core drill for drilling large diameter wells, including 883014 drill casing with a drill pipe, a rock-breaking tool and a core trimming and holding mechanism with a tension frame having a pulley, a shaft and an emphasis, 5, and with an endless cable rope covering upper and lower guides and a pulley, characterized in that In order to increase work efficiency by speeding up the trimming while simultaneously drilling the well, the drill body is made integral, the inner section of which is installed in the outer section with the possibility of axial movement, with f5 this the drill pipe is fastened with the outer section In this case, the trimming and retaining mechanism of the core is located in the inner section, and the tension frame is rigidly connected with the inner section of the drill. 12 Compiled by L.Cherepenkina Editor N.Tupitsa Tehred L.Oleinik Order 7780/28 Circulation 455 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 2 Proofreader T. Kolb