SU1317095A1 - Core-drilling tool - Google Patents

Abstract

The invention relates to mining and improves the reliability of operation of the coring projectile (CC). It contains a destructive crown 2, rigidly connected to the core pipe 1. A boring 3 is made on the inner surface of the crown 2 or pipe 1. A movable rotating sleeve 4 with radial holes (PO) 6 is installed in it. core particles (K) jammed from the gap between K and KS. They are made in the form of through PO 5, coaxial with PO 6, and have an equal diameter. In the presence of sludge between K and the sleeve 4, the latter does not rotate or rotates with a rotation frequency less than that of the CS. At the same time, RO 6 periodically coincides with RO 5. As a result, a part of the flushing fluid flow in the sludge through PO 5.6 and does not allow it to accumulate in an amount sufficient for clearing and self-sealing of K. 2 Il. (L

Description

FIELD OF THE INVENTION The invention relates to mining, in particular, to technical equipment for core drilling.

The aim of the invention is to increase the reliability of the coring projectile.

Figure shows a projectile with a movable sleeve in a rock-breaking crown, a section; Fig. 2 shows a design with a movable sleeve in a core tube.

Columnar projectile contains a column tube 1, rigidly connected to

core pipe

crown 2.

In one embodiment, the lunstructions in the lower part of the projectile on the inner surface of the crown 2 have an internal bore 3 with a movable sleeve 4 and channels for removing rock particles wedged | Kern from the gap between the core and the core projectile made in the form of through radial holes 5 in the bore wall 3, the Sleeve 4 has radial holes 6, while the holes 5 and 6 are coaxial and have equal diameters. Sleeve 4 is fixed in the bore by a spacer sleeve. 7

In another embodiment, the design of the bore 3 is completed on the core pipe

The coring projectile according to FIG. 1 is intended to collect soft plastic rock cores (such as limestone), during drilling of which core discontinuity occurs as a result of self-wedging with sludge, which accumulates and condenses in the inner annular gap between the inner surface of the crown and the core surface during forced drilling conditions.

The columnar works as follows.

The rig is lowered to the bottom of a squat and drilled in the mode of intensive destruction of a rock at a circular bottom. At the same time, a core column begins to form at the bottom of the well, and the sludge accumulates in the annular gap between the inner surface of the crown 2 and the surface of the core. Since the sleeve 4 has the possibility of axial rotation relative to the crown 2, the excess and compacted sludge stops the rotation of the sleeve 4, which, together with the inner surface of the bore 3

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five

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20

five

thirty

40

45

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55

is an anti-friction pair. At the same time, the rock crown 2, which is rigidly connected to the column pipe 1, continues to rotate (sleeve 4, with cuttings, does not rotate, or rotates at a rotation frequency lower than the rotation frequency of the column projectile). As a result, the holes 6 in the movable sleeve 4 are periodically coincided with the holes 5 in the crown 2, while a portion of the flushing fluid stream carries the sludge through the coincident holes 5 and 6, which prevents the sludge from accumulating and sealing to core.

The column slug according to FIG. intended for coring hard, monolithic rocks (such as granite), which, when drilled, produces an insignificant amount of spam per unit of time and the crown ring is not polluted. In this case, a violation of core integrity results from self-jamming with small pieces of rock in an annular gap | the inner surface of the core tube and the surface of the core.

The columnar works as follows.

It is lowered to the bottom and drilled. At the same time, a core column begins to form at the bottom of the well, and pieces of rock are accumulated in the lower part of the core pipe (the formation of small pieces of rock is associated with a breakdown of the core at the end of the voyage, as well as dumping of pieces of rock from the walls of the well). lifting operations, etc.). The stop-, cage-bushing 4 and the release of the backing material by the flow of the washing liquid into the gap between the outer surface of the coring and the walls of the well is similar to the work of the coring, shown in Fig.1. Periodic release of the keyhole. material flow flushing fluid does not allow him to accumulate in an amount sufficient to break the core.

Claims (1)

Invention Formula A column projectile containing a coring tube, a rock-crushing crown rigidly connected to the core pipe, channels for removing core particles wedged from the gap between the core core and the core projectile, characterized in that, in order to increase reliability, it is equipped with a movable sleeve with radial holes mi, and on the inner surface of rock-breaking 170954 the crown or core tube is bordered, the movable sleeve is installed in the latter for rotation, and the channels are made in the form of through radial holes in the wall of the bore coaxially with the holes of the sleeve and with the same diameter. Editor M.Kelemes Compiled by B. Aksler, Tehred L. Oliynyk Proofreader E. Roshko Order 2399/27 Circulation 532 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 srig.2.