SU713979A1 - Apparatus for drilling with core-taking - Google Patents

Description

one

The invention relates to the field of mining, namely to drilling devices 1C coring.

BACKGROUND OF THE INVENTION Known core sampling devices are known for drilling with bottomhole back circulation of washing liquid, containing a core pick, a rock-breaking tip and a throttling element that creates local additional hydraulic resistance in the annulus above the face 1.

The disadvantage of these devices is the inconsistency of reverse circulation due to the varying hydraulic resistance in the annulus above the face, due to deviations of the surface of the borehole wall. This disadvantage is eliminated in devices where an insulating packer is used instead of a throttling element.

Such a device is known to contain a coring device with a system of channels for creating a bottomhole reverse circulation of flushing fluid, a rock destructive tip. And a packer for isolating the reverse circulation zone from the annulus of a well having a maximum diameter equal to the diameter of the well formed by the rock bending tip 2.

However, when drilling with this device deep wells, where the need arises to drill the wellbore by interrupting the projectile, the packer expands under the effect of pressure drop and undergoes greater abrasion at drilling speeds than during drilling.

The aim of the invention is to improve the operational reliability of the device during the drilling of deep wells by preventing the packer from being worn during the development of the well bore by scuffing the projectile.

This goal is achieved by the fact that the known device for drilling with coring is equipped with an expander of the well bore, which is installed above the packer and has a diameter greater than the maximum diameter of the packer.

FIG. 1 shows a device in a cutter, general view; FIG. 2 shows section A-A in FIG. one.

An apparatus for drilling a core sampling well bottom reverse washing vyuiochaet rock cutting tip 1 kernootborochny projectile, conditions of the body 2, kepnOIIpie ffloy yernorvatell pipes 3 and 4, tk rutoschy member comprising calibrator 5 and the packer b and expander 7. Calibrator 5 and the packer b is installed with the possibility of replacing on the integral adapter 8, in which a system of openings 9 and 10 is made, which form the discharge note of the syringe fluid in the return zone in the bottomhole zone. The calibrator 5 is fixed on the adapter 8 by a nut 11, and the hook b is mounted with the possibility of rotation relative to the adapter 8 and the calibrator 5. The length of the core-receiving tube 3 is filled with holes that are not perforated: 12 in order to prevent it from burning mud, and in the upper part of the tube, below the last row of holes 12, the stop 13 is exchanged to prevent the closure of the passageway 9 when ftepHa moves upwards.

The device works as follows.

. When descending into a wellbore having a diameter / equal to the diameter of the reamer 7, the drill head 1, the calibrator 5 and the packer b, having a smaller diameter, do not touch the walls of the well, and, in known devices, do not wear out during the descent. Having reached the bottom, the drill head I, the calibrator 5 and the packer b enter the barrel of the previous voyage of the device and equal to the distance between the Nind face of the drill HEAD 1 and the working element of the accelerator 7. At the time the device rotates under load With a drilling fluid, the drill head 1 deepens the wellbore and forms a core. The calibrator 5 spreads the formed bzfilny head 1 barrel directly underneath the 6, so that the last ra (returns in a calibrated barrel, providing good coaxing and lightly all flowing from

channels 10 fluid to the bottom of the well. The fluid, cooling the drill head and the sludge entrainment, enters the core receiver tube 3 and lifts the core formed until it stops 13. The fluid with the sludge flows around the core through the perforations 12 and further in the gap between the tube 3 and the shell 2, then through the channels 9 goes up above the packer. The presence of holes 12 prevents zashamovanie and jamming of the core.

The use of a gland-attached device increases the resistance of the drill head and tker, increases the core output and the penetration rate, increasing the efficiency of drilling with coring.

Claims (2)

1. Volkov A.S., Volokitenkov A.A. Buresh e squalash with reverse flow of the liquid. M., Nedra, 1970, p.128. 2. Grebenyuk A.A. Core technology and technology. M., Nedra, 1973, p.94, fig. 45 (prototype).