SU1469097A1 - Core-drilling tool - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to mining and is intended for core drilling. The goal is to increase the core yield. The snare includes an outer pipe 1 with a rock-cutting tool 2. Inside the pipe 1 are a core-receiving pipe (QPT) 3 with a lever core 4 on an external movable sleeve 5 and a KPT 3 transfer mechanism. The latter has a hollow body 8 and a tubular piston 9 fastened between a lock with a locking ball 10 in the cylindrical groove 11 of the housing 8 and with the control valve assembly 12 limiting the movement of the ball 10. In the housing 8 in the area adjacent to the lower end of the piston 9, passage channels 14 are made. less than the distance from the lower end of the QPT 3 to the upper edge of the bursting of the core 4 and less than the stroke of the body 8 to the piston 9 covering the channels 14 that perform the function of the core wedge alarm. When the fragmented core is wedged in the CPT 3, the tube 1 and the CPT 3 move reciprocally to the length of the groove 11. The channels 14 then overlap with the tubular piston 9. The fluid pressure in the drilling rig also increases, which is fixed by a manometer and signals the core has been wedged in the drill de. 2 Il. СО 4 О5 со о со Фые.7

Description

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

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

FIG. 1 shows a columnar in the drilling position when no sub-curing occurs; in fig. 2 - core slug in the event of core sticking.

The column projectile contains an outer tube 1 with a rock-cutting tool 2. Inside the tube 1 there is a core-receiver tube 3 with a lever core core 4 on the outer movable sleeve 5.

A core-receiver tube 3 is connected to the sub 6 via a bearing bearing 7 and a displacement mechanism having a hollow body 8 and a tubular piston 9 secured with a lock formed by the locking ball 10 in the cylindrical bore 11 of the body 8 and limiting the movement of the ball 10 by the control valve assembly 12, fixed in the piston by the stopper 13. In the housing 8 in the area adjacent to

the lower end of the piston 9, made through channels 14.

The cylindrical groove 11 has a length of 1, allowing free movement of the housing 8 less than the distance 1 from the bottom edge of the core receiving tube 3 to the upper edge of the core-rotator levers 4 and less moving the housing 8 to blocked by the piston 9 with channel 14, which at this moment serve as a signaling device core wedging. In the piston 9, holes 15 are made, connecting the discharge channel 16 with the cavity 17.

Kolonkovsh sn d works as follows.

After the projectile is lowered to the bottom of the well and the filing of the washing device on the face through the central hole of the bearing assembly 7 and the core receiving tube 3, the ball valve 18 is passed, which passes through the overstriction in the control valve assembly 12 and is installed in the bearing assembly 7 Due to the fact that the channel for the passage of fluid through the core tube 3 is blocked, the flow of flushing fluid is directed through the channels 14 into the annular space and rotated into the rock breaking tip to the bottom of the well.

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Then, the rotation of the projectile is turned on, the axial load on the face is created, and the core is drilled. The latter enters the core pick-up tube 3, and in the process of drilling (Fig. 1), the levers of the core-body 4 are isolated from the core by a core pick-up tube.

When the fragmented core is wedged in the core-receiving tube 3 (Fig. 2), the outer 1 and 3-core-3 tubes move relative to the length of the cylindrical bore 11. At the same time, the channels 14 begin to overlap with the tubular piston 9. As a result, the fluid pressure in the drilling block, what is fixed by the manometer and signals the detection of the core in the instrument.

For the normal operation of the projectile, it is necessary that in the process of drilling without wedging the core, the channels 14 are completely open and do not create additional resistance to the flow of fluid. However, the stroke overlap of channels 14 should not exceed the length of the cylindrical groove for the full operation of the 30 signaling unit.

In addition, it is necessary that when the core is wedged and the outer 1 and core-receiver pipes move between each other, the core-rotator does not open. For this, the length of the cylindrical groove 1 must be less than the distance li from the lower end of the core receiver tube to the upper edge of the lever of the core rotator 4,

The breakdown of the core after the piercing or end of the voyage is carried out as follows.

Without detaching the projectile from the bottom of the well, a second ball valve is thrown into the cavity of the drill pipe, which

force of force or flow

is installed in the seat of the control valve assembly 12. Then the pump is turned on, pressure is created inside the drill pipe string, which, through

 The ball valve and the valve assembly 12 act on the stopper 13. When the force that exceeds the strength of the material of the stopper 13 is reached, it is cut off.

5 After that, the valve assembly 12 with a ball valve moves to the lower part of the tubular piston 9. At the same time, through the openings 15 it rises

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the pressure in the cavity 17, the hollow body 8 with the core-receiving tube 3 is moved upwards, pushing the balls 10, which leads to the disconnection of the body 8 and the tubular piston 9. As the body 8 continues to lift from the core-receiving tube 3, the levers of the core valve 4 are released rests on the core. Then, the projectile is lifted above the bottom of the borehole, the levers of the core 4 are inserted into the core, and, tearing it away from the bottom, they are held inside the core tube 3.

After that, the projectile is lifted from the well and the core is extracted.

Claims (1)

Invention Formula A core projectile containing an outer pipe with a rock-breaking tool, an inner core tube with a lever core ring on the outer movable sleeve inside and a core tube moving mechanism having a hollow body and a tubular piston fastened together with a lock ball in a cylindrical pipe. enclosures and with limiting displacement Q ball controlling valve assembly,. characterized in that, in order to increase the core output, it is equipped with a core wedging detector in the form of flow channels in 5 with a hollow body in a region adjacent to the lower end of the tubular piston, with the cylindrical groove of the lock having a length less than the distance from the lower end of the core receiver 0 pipes to the upper edge of the core knob lever and less than the body stroke until the passage channels are blocked by the tubular piston.