SU1174555A1 - Core tool - Google Patents

Abstract

A COLUMN RING, containing a core pipe and a screw pump with a sleeve connected to the drill pipe and a screw located inside the sleeve, characterized in that, in order to increase the drilling efficiency, the screw pump is equipped with a choke installed at the outlet of the high pressure cavity and the column pipe is connected to the pump screw with the possibility of transferring the moment of force, (L

Description

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FIELD OF THE INVENTION The invention relates to mining, namely to means for drilling a well with coring.

The purpose of the invention is to increase the drilling efficiency.

The drawing shows the core drill d, a general view in section.

The column projectile contains a column pipe 1 and an adapter 2 connecting it with the nozzle 3. A thrust bearing 3 is placed between the annular abutments of the nozzle 3 and the pipe 4. The packing seals 6 are installed above and below the bearing 5. force screw 8 of the pump with the nozzle 3, and through it with the column pipe I. The screw 8 of the pump is located in the holder 9 of the pump at the outlet of the cavity 10 high pressures; A choke 1t is installed above the pump, having interchangeable washers with different hole diameters. The coring rod is lowered onto the drill pipe 12, which is connected to the clip 9.

The process of drilling a well is as follows.

After the projectile is lowered, the axial load on the bottom of the well is created by the hydraulic system of the drilling rig and the rotator is turned on. At the same time, the drill pipes 12, the pump holder 9 and the pipe 4 rotate relative to the pump pump 8, since it is braked through the flexible shaft 7, the pipe fitting 3, the adapter 2 and the core pipe I about the bottom hole. The flushing fluid is circulated from the bottom through the column pipe 1, adapter 2, pipe 3,. pipe 4 through the cavity of the pump between the screw 8 and the yoke 9, through the throttle 11 and the holes in the drill pipe 12 to the bottom.

However, the throttle 11 creates a pressure drop across the pump, providing the necessary moment of force dp of rock destruction at the bottom of the core pipe.

The amount of power expended to circulate the fluid is determined by

a decrease in the number of revolutions of the core pipe 1 with respect to the drill pipe 12 and is of a pump characteristic. So the pump NVZM-01 can create a flow rate of 30 l / min through

hole 6 mm at 50 rpm Consequently, if the drill string rotates at a frequency of 500 rpm, then the column pipe rotates at a speed of 450 rpm, while

downhole torque. Under these conditions, 10% of the power used to destroy the rock was spent to create the circulation of the washing liquid.

Claims (1)

A COLUMN APPARATUS comprising a core pipe and a screw pump with a cage connected to the drill pipe string and a screw located inside the casing, characterized in that, in order to increase drilling efficiency, the screw pump is equipped with a throttle installed at the outlet of the high-pressure cavity, and the core pipe is connected to the pump screw with the possibility of transmitting a moment of force. SU, 1174555 1 il