RU1798477C - Outfit for drilling with continuous core recovery - Google Patents

Abstract

Usage: core drilling with continuous core removal from the bottom of the well to the surface. SUMMARY OF THE INVENTION: a projectile comprises a drill pipe string with a rock cutting tool in the lower part, an oil seal and a sealant in the upper part. Above the rock cutting tool, a crusher is placed on the drill string. The crusher has a crushing unit for coarse fractions in the form of at least two rolls. The rolls are mounted on the drill string with the possibility of rolling relative to the latter. At an angle of crushing of large fractions, a fine attrition unit is installed. It is made in the form of a sleeve with slots for passage of flushing fluid. The rolls are offset in diametrically opposite directions. 3 ill.

Description

The invention relates to core drilling of wells with continuous core removal from the bottom of the well to the surface,

The purpose of the invention is to increase the reliability of core equipment.

Figure 1 shows the proposed projectile d; in Fig.2 - section aa in Fig.1 ;. in Fig.Z - section bB in Fig.1.

The core drill string comprises a drill pipe string 1 with an enlarged and smooth-walled central channel 2, similar to a CCK-59 string, for example. On the bottom of the column is a rock cutting tool 3, a diamond drill bit, in particular. In the upper part there is an oil seal 4 with a nozzle 5 for draining the flushing solution, which carries out core pieces 6 and particles of sludge. The wellhead is fixed by a casing 7 with a nozzle 8 for supplying flushing fluid to the well and equipped with a preventer 9. Rotation and axial feeding the columns

produced by mechanism 10. In the lower part of the column above the rock cutting tool 3, a device is mounted for grinding rock particles from the borehole wall. It comprises ring-shaped rollers 11, clad on an eccentric column 1, and an abrasion device 12 in the form of a sleeve with slots for passage of flushing fluid with rock particles to the bottom.

During drilling through the nozzle 8 through the annular space 13 between the column 1 and the borehole wall, a flushing solution is supplied to the bottomhole. A piece of rock 14 captured by him from the borehole wall falls into the space between the borehole wall and the roller And, which, when the column 1 rotates, rolls around the wall and crushes the piece 14 due to eccentricity. and are worn down to smaller sizes; through the crown 3 act

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They are buried in the inner channel 2 of the column 1, together with core pieces 6 and drill cuttings, they are carried to the surface. Here, the slurry of crushed particles is separated from core particles due to a significant difference in size.

Pieces of core are chipped with a special core breaker and carried upstream under conditions of minimal contact, abrasion and loss.

The use of the inventive core drilling projectile is advisable under conditions with low absorption of the drilling fluid, with elimination of absorption due to the high-quality composition of high viscosity drilling fluid.

Claims (1)

The claims Continuous core drill string containing column0 well, drill pipes with a rock cutting tool in the lower part, an oil seal and a sealant in the upper part, and a crusher placed on the drill string above the rock cutting tool, which means that, in order to increase reliability, the crusher has a crushing unit coarse fractions in the form of at least two rolls mounted eccentrically on the drill string with the possibility of rolling in relative to the latter, and a fine abrasion unit rigidly mounted on the drill string under the crushing unit of large fractions and made in the form of a sleeve with slots for the passage of washing fluid, the rolls being biased in diametrically opposite directions.