SU1048108A1 - Core drilling tool - Google Patents

Abstract

Core barrels containing the sub body, the core tube with the saddle under the disposable valve connected to the core tube, core catcher in the form of a thin-walled cylinder with teeth gripping at the bottom end and separated emoe pressurized fluid mount the core tube in the housing, characterized in that, with In order to increase the drilling efficiency up to the core sampling interval, it is equipped with a hollow bushing with a saddle under the dump valve, while the bushing is fixed with shear pins inside the core tube, and the core drill and is formed with radial channels which are located under the bush and the valve seat tube. i cl 4 00 oo

Description

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

The coring tubes containing the sub, body, core tube and rock-breaking core for core 1 are known.

A disadvantage of the known projectiles is the complexity of the design of the mechanism for moving the core in the core sampling interval.

A more reliable device with a core controlled by a hydraulic channel is known, by means of which it is possible to capture the core only at certain intervals. The known projectile contains a sub, a housing, a core receiver tube with a saddle under the dump valve connected to the core receiver tube, a core breaker in the form of a thin-walled cylinder with grip teeth at the bottom end 2.

However, the destruction of the core in such a projectile in the drilling intervals without core sampling is not effective due to the lack of an appropriate direction of flow of the washing liquid.

The purpose of the invention is to increase the drilling efficiency up to the core sampling interval. The above objective is achieved by having a core tube containing the sub, body, core tube with a saddle under the dump valve connected to the core tube in the form of a thin-walled cylinder with engagement teeth on the bottom end and section The fluid pressure mounting of the core tube in the housing is equipped with a hollow bushing with a saddle under the discharge valve, while the sleeve is fixed with shear pins inside the core receiving tube, and rnopriemna pipe is formed with radial channels that are arranged at the bushing and the valve seat tube.

FIG. 1 shows a diagram of the core device, transport position and when drilling without coring; in fig. 2 - the same, the position of drilling with coring; in fig. 3 - the same, the position of the inclusion core and open radial channels.

The core projectile contains an adapter 1, which is threadedly connected to the housing 2. The core receiver tube 3 is fastened through the shank 4 in the housing 1 by shear hooks 5. On the shank 4, the seat 6 is made under the relief valve 7 and the radial channels 8 located above the seat 6. Above the channels 8 inside the shank 4 of the core-receiver pipe 3, the sleeve 9 is installed with the seat 10, the relief valve 11 is discharged. The sleeve 9 is kept in the initial position by shear pins 12. At the lower end of the core-receiver pipe there is a core hole 13, made in the form of thinness of the cylinder with the teeth 14 of the grip along the lower end in the zone of the location of the coring bit 15.

Columnar d, works as follows.

The core rig in the open position is lowered to the bottom of the well and performs drilling in the mode of intensive destruction of the rock at the bottom. In the process of drilling, periodically raise the projectile over the face by an amount slightly larger than the interval covered. The core formed at the same time under the action of dynamic forces and the flow of liquid goes into pieces, pours out of the core and is destroyed by the core bit when the devices move back to the bottom. In such a sequence of operations, the well is drilled to the core sampling interval. At the beginning of the core sampling interval, a ball valve 7 is dropped into the drill string, which, when reaching the lower seat 6, blocks the flushing through the core pipe and the flushing fluid through the radial channel 8 and the annular section between the body 2 and the pipe 3 goes further through the bit 15 to the bottom of the well . Core drilling is carried out without detachment from the bottom hole.

After the end of drilling with the coring, the ball valve 11 is dropped into the drill string, its diameter is larger than the ball valve diameter 7, when the seat 10 of the sleeve 9 is cut off, the pin 5 is cut off, and the pipe 3 is pushed down by fluid pressure. The pipe 3, moving downward, pushes the corenator 13, whose teeth are bent on the conical undercut of the bit 15 and overlap the mouth edge of the core pickup or jam the core. A further increase in pressure in the drill string leads to the cutting of the pins 12, and the sleeve 9 is lowered to the lower position, opening the flushing channels 8 through which the well is flushed. The lifting of the core device with a core and its extraction are carried out by one of the known methods.

The application of the proposed core device allows for a more complete development of the pulley heads, reducing the time for tripping by reducing their number, increasing core removal, speed and effectiveness of exploratory drilling.

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Claims (1)

A CORE APPARATUS containing a sub, a housing, a core receiver pipe with a seat for a reset valve connected to a core receiver pipe, a core explorer in the form of a thin-walled cylinder with gripping teeth at the lower end, and a core receiver mount in the case, shared by liquid pressure, characterized in that, in order to increase drilling efficiency to the core sampling interval, it is equipped with a hollow sleeve with a seat for a reset valve, while the sleeve is fixed with shear pins inside the core receiving pipe, and the core receiving pipe is ying with radial channels that are arranged at the bushing and the valve seat tube.