SU1469096A1 - Drilling tool - Google Patents

Abstract

The invention relates to mining and is intended for air drilling with coring. The goal is to increase the efficiency of drilling and core recovery. The rig contains a string of drill pipes 1 with pressure 2 and double 3 branch ducts, a pneumatic hammer 4. The snar d has a column pipe 6 with rock cutting tool 7 and a connecting sub 5 connecting the pneumatic hammer 4 with pipe 6. in the form of a casing 8 fixed from the outside on the pneumatic striker 4 and a pneumatic injector in the sub 5. The channel 3 communicates via a mixer with the cavity 13 of the pipe 6. The casing 8 has an internal

Description

one

- The invention relates to mining, to means for air percussion drilling with core sampling and a reverse scheme for removing degradation products from the bottom hole and well.

The purpose of the invention is to increase the efficiency and yield of core.

FIG. 1 shows a diagram of a drilling rig, a slit; in fig. 2 — node I in FIG. one.

The drill string contains a column of double drill pipe 1 with pressure 2 and side 3 channels. The pipe string is connected to an air hammer 4, which, in turn, is connected with a connecting sub-tube 5 with a core pipe 6, which has a rock-breaking tool 7 on its end. On the outside of the air hammer there is a casing 8, which has protrusions 10 and 11. In the sub 5, a pneumatic injector is defined as calibrated holes 12. The casing 8 together with the injector form an air-lift mixer with a cavity 13 through which the column tube 6 communicates with the diversion channel 3 .

The drilling rig operates as follows.

The air injected through channel 2 through the holes 12 enters the mixture

0

five

five

0

The vessel, where the air-water mixture is formed, according to the law of the communicating vessels, and under the action of the dynamic pressure rises through the channel 3. At the same time, in the core pipe there is a reverse circulation of water due to the resulting pressure drop.

The operation of the hammer is independent of the effectiveness of the removal of sludge, and the flow of air does not destroy the core.

Claims (1)

Invention Formula A drill string containing a string of drill pipes with a discharge channel, an air hammer, a core pipe with a rock cutting tool and a connecting sub connecting the air hammer with a core pipe, characterized in that, in order to increase the efficiency of drilling and core output, it is equipped with an air-lift mixer  mounted on the outer side on the pneumatic impactor of the casing and the pneumatic injector in the connecting sub, the drill pipe string is doubled with a diversion channel communicating through the mixer with the cavity of the core pipe, and the casing has the internal shape of an annular diffuser. J W Фа2.2