SU1373813A1 - Bench for testing drillability of rock - Google Patents

Abstract

The invention relates to mining. The purpose of the invention is to increase the reliability and productivity of research. The stand contains a cylindrical body 1, boring 2 and core 3 pipes with a crown 4, a centralizer 5 with sealing elements 6 for a pipe 2, an adjusting valve 15 and a parameter measuring device 16 communicating with 2 7 i СО CO and CX) with / 7 fieL

Description

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casing 1. On the latter, the support 8 and pressure 9 rings are fixed. An additional elastic element 10 is placed under the ring 9 on the housing 1. A rocker arm 11 is installed on the ring 8, at the ends of which there is a tray 12 for accommodating the tested rock block. At the ends of the rocker arm 11, a tensioning device 14 is installed, which moves along the rocker arm 11 and is intended to be attached to the pallet 12.

The washing liquid is produced by the crane 15, and the pressure control is performed by the device 16. The possibility of changing the attachment point of the device 14 to the rocker 11 and the pallet 12 allows the body position to be arbitrarily changed in relation to the rock block 13. By compressing the sealing elements 10, a reliable sealing of the shank in the seat of the block 13 and the centering of the housing 1, 3, is achieved.

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The invention relates to mining, in particular to experimental stands for studying the drilling capacity of rocks under conditions of excessive pressures of flushing fluid at the bottom of a well, and can be used in designing well cleaning modes and in developing drilling fluid compositions.

The purpose of the invention is to increase the credibility and productivity of research.

Fig. 1 shows a stand for examining rock drillability; in FIG. 2, the same, top view; Fig. 3 shows an additional combined crown for preliminary formation of a seat in the block of rock.

The stand contains a cylindrical body 1, a drill pipe 2 arranged therein, a core pipe 3 with a crown 4, a centralizer 5 and sealing elements 6 for the drill pipe 2, a gland nut 7 mounted on the body 1, a support 8 and a pressure 9 rings fixed on the body 1 , additional elements 10 mounted on the housing under the pressure ring 9, the rocker 11 fixed on the support ring 8, the pallet 12 for accommodating the rock 13 used in the study, tensioning devices 14 mounted on the ends of the rocker arms 11 with moving along the rocker arm 11 and attached to the pallet 12, the adjusting valve 15 and

the device 16 changes parameters communicated with the cavity of the housing 1,

For preliminary formation in the rock block 13 of the landing place for body 1, an additional combined crown (Fig. 3) is used, consisting of the first crown 17, the adapter 18 and the second pilot crown 19 of a smaller diameter.

The bench works as follows. Previously, in block 13 of the rock, a seat for the sealing elements 10 (large crown 17) and body I (pilot crown 19) is bulged out by a combined crown (FIG. 3).

After that, the sealing elements 10 are put on the housing 1 up to the pressure ring 9, it is installed in the seat of the block 13, the movable arms of the tensioning devices 14 are put on the rocker 11, with the help of the latter the sealing elements 10 are compressed and seal the seat in the block 13, the shank of the housing 1 enters the seat drilled by the pilot crown 19,

After sealing the housing 1 in block I3 of the rock, a study of the drillability of this rock with the crown 4 is carried out. The load and rotation to the crown 4 are transmitted through the drill pipe 2 and the core pipe 3,

The pressure control of the flushing fluid is made by the adjusting cock 15, and the pressure control is controlled by the parameter measuring device 16.

The possibility of changing the place of attachment of the tensioning devices 14 to the rocker 11 and the pallet 12 allows you to randomly change the position of the housing 1 with respect to the rock block 13, without changing the position of the block 13 itself onto the pallet 12,

The pilot crown 19 (figure 2) protruding above the end face of the crown 17 is not less than 30 mm. At the same time, due to sufficient compression of the sealing elements 10, a reliable sealing of the shank of the housing 1 in the seat of the block 13 and the centering of the housing 1, which does not touch the bottom of the seat, is achieved.

The use of large blocks in the process of studying the drillability, which retain to a greater degree (compared to the samples processed to a certain geometrical dimensions) the properties of the rock, increases the reliability of research. Research productivity is enhanced by eliminating the manufacture of standard samples and the possibility

conducting several drilling processes on one block of rock,

Claims (1)

Invention Formula A bench for investigating rock drillability, comprising a cylindrical body, a drill pipe and a core pipe with a crown, a centralizer with sealing elements for a drill pipe, an adjusting valve and a parameter measuring device communicating with a housing cavity, characterized in that, in order to increase the reliability and research performance, it is equipped with support and pressure rings fixed on the body, additional elastic elements placed on the body under the pressure ring, the beam, Formation on a support ring for receiving the test tray rock block and tensioner mounted on the ends of the rocker movable along the rocker arm and intended for securing to the pallet. fiez