SU899844A1 - Core-drilling tool - Google Patents

Description

(54) COLUMN SHEET

FIELD OF THE INVENTION The invention relates to mining, to tools for drilling with coring.

Known cores containing a column of pipes, a core pipe with a rock-breaking tip and core receiver bearing assembly 1.

A projectile is known in which, in order to increase productivity and core output, a removable core receiver is used that is retrieved through a column of pipes. Such a projectile contains a string of drill pipe, a core pipe with a rock-breaking tip and a removable core receiver with a retainer and a bearing assembly 2.

The disadvantage of this projectile is that it is not possible to increase the output of the core under conditions when this requires upward circulation of fluid flow through the core receiver.

The purpose of the invention is to increase the core yield by creating an upward flow in the cavity of the core receiver.

This goal is achieved by the fact that, in a known columnar, the removable core receiver is equipped with a sludge receiving pipe with cuffs at its upper and lower ends and with holes. located

between the cuffs, and the column pipe on the outer surface is made with longitudinal injection channels, longitudinal grooves and with holes, while the grooves through the holes in the core and slurry receiving pipes are connected with the cavity of the latter.

In addition, a slurry pipe is installed between the retainer and the bearing unit.

FIG. 1 shows a coroner, longitudinal section; in fig. 2 - fragment

10 is an axonometric view of a device with injection channels, holes and grooves (arrows indicate the direction of flow of the washing liquid).

The rig consists of a drill string. 15 pipes 1, a core pipe 2 with pressure channels 3 and 4 holes for the washing liquid, a rock-breaking tip 5 in the form of a crown with spiral blades and a removable core receiver 6 with a core holder 7 and a bearing unit 8 and a retainer 9, between which there is a sludge receiving pipe 10 with cuffs 11 at its lower and upper ends, between which holes 12 are made. A hollow rod 13 with openings 14 serves to connect all the core receiver units. The core 3 in the core tube 2 is provided with holes 15 for the exit of the washing liquid from the projectile into the slots 16 and the outer space.

The proposed device works as follows.

When drilling, the removable core receiver B is lowered into the cavity of the drill pipe 1 and the pressure of the flushing fluid is brought to the bottom. The moment of setting the core receiver B on the bottomhole is fixed on the surface with pressure gauges when the pressure of the washing liquid increases as a result of 11 holes 4 closing the cuffs and their subsequent opening. After the core receiver 6 is placed on the bottomhole, the washing fluid enters the bottomhole through the cavity of the drill pipe 1, holes 4 and channels 3, cooling the crown 5, destroying the bottom hole and carrying it through the annulus to the surface. Part of the washing liquid, washing the crown 5, enters the cavity of the core receiver 6 and through the central channel of the hollow rod 13 through the holes 14 enters the cavity of the sludge receiving pipe 10, from where it is freed from the sludge through the holes 12 in the sludge receiving pipe 10 and the holes 15 and grooves 16 core pipe 2 enters the annulus. At the same time, the core experiences forces from the side of the washing liquid directed towards its movement, i.e., into the cavity of the core receiver 6, and the sludge particles are carried by the stream of washing liquid into the sludge receiving pipe 10, eliminating the possibility of self-jamming of the core core 6. favorable conditions are created for core formation.

In addition, when lifting the removable core receiver 6 carried out after the core has been drilled for the length of the working core of the core receiver 6, a vacuum is created in the cavity e because the holes 12 of the sludge pipe overlap the walls of the drill string 1 and the cuffs 11, which contributes to the reliable holding of the core in the core receiver 6.

5After removing the core from the core receiver 6 and cleaning the sludge pipe 10 from sludge, the cycle is repeated.

Claims (2)

1. A column drill containing a drill pipe string, a drill pipe with a rock-breaking tip and a removable core receiver with a retainer and a bearing unit, characterized in that, in order to increase the core output by creating an upstream flow in the core receiver, the removable core receiver is provided with a slurry receiver. with cuffs at its upper and lower ends and with openings located between the cuffs, and the column pipe on the outer surface is made with longitudinal injection channels, longitudinal grooves and with openings, while the grooves through the openings in the drum and sludge receiving pipes are connected to the cavity of the latter. . 2. A tool according to claim 1, characterized in that the sludge receiving pipe is installed between the retainer and the bearing unit. Sources of information taken into account in the examination 1.Bibikov K.I. and others. New drilling tools for exploration drilling, used abroad. Review, a series of “Technique and technologists of geological exploration, production organization, M., VIEMS, 1967, No. 7, p. 13. 2. Fiber I. And. And others. Technical means and methods of increasing the output of the core. Review, a series of "Technique and technologists of exploration, production organization. M., VIEMS, 1973, fig. 24 (prototype).