SU1446273A1 - Tool for drilling wells with slurry conveyed via double drill pipe string - Google Patents

Abstract

The invention relates to the mining industry. The goal is to increase the mechanical speed of drilling by improving the bottom hole cleaning. Snar d includes a housing 2 with a slurry cavity 11 and an adapter 1 under the drill pipe. A limiting grate 12 is installed in the cavity 11. The cutting radial blades 5 are attached to the body 2 in the lower part. They have windows 7 for communicating the external space with the cavity 11. The body has a guide plate 8. The internal walls of the windows 7 are inclined to the axis of the body 2 s cone formation. The top of the latter is directed toward

Description

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bo The plates 8 are installed tangentially, specifically on the inner wall 9 of the window 8 and cover the cavity 11, which improves the cleaning of the bottom. The slurry moves to the zone of action of the cleaning agent due to the rotation of the drill string. Grate 12 prevents large pieces of cuttings from entering the

cone. Blades 5 are cooled during the pacing of the drilling tool. When setting the projectile to the bottom, the cavity 11 is filled with sludge moved by the plate 8, and leakage of the washing liquid into the annulus stops. 4 il.

one

The invention relates to the mining industry and can be used for drilling wells using double-boring pipes and transporting sludge with a stream of cleaning agent.

The purpose of the invention is to increase the mechanical speed of drilling by improving the bottom hole cleaning.

FIG. 1 shows a projectile, longitudinal section; in fig. 2 is a view A of FIG. one; FIG. 3 shows a projectile with three blades; in fig. 4 view B in FIG. 3

The rig contains an adapter 1 for the drill pipes connected to the housing 2, inside which the nozzle 3 and the nozzle 4 are mounted. To the lower part of the housing there are cutting radial blades 5 that have a window 7 open to the central axis 6. The guide plates 8 are set tangentially on the inner inclined wall 9 of the window is 7, have sharp edges 10 and cover the slime-intake cavity 11 of the housing 2.

Windows 7 communicate the outer space with the slurry cavity 11, and the inner walls 9 are inclined to the axis of the housing 2 to form a cone. The upper parts of the blades 5 located under the windows 7 form a restrictive grid 12,

The inner directions of the outer plate 8 (Figs. 1 and 2) can be executed by cutting one single blade consisting of two blades 5, with a T-shaped groove along the central axis 6. The edges of the cut are bent in opposite directions in the tangential direction, forming ravl yuodae

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plates with the possibility of engaging the sludge intake cavity.

In addition, each blade can be manufactured separately and then fastened to the body and to each other by welding (Fig. 3). The inclined walls 9, to which the plates 8 are attached, are located on a common conical surface and are directed by the apex 13 towards the bottom side ( Fig. 1 and C).

Snar d works as follows.

When drilling, the cleaning agent from the drill pipes through the nozzle 4 is injected into the central channel of the nozzle 3. Destruction of the rock at the bottom is carried out by paddles 5. Destroyed rock and psham are picked up by the guiding plates 8 and sent to the slurry cavity 1 of the projectile. The best cleaning of the bottom is achieved by the fact that the guide plates 8 are installed tangentially, the radial components of the forces from the applied torque moment act on the sludge and, when the projectile is rotated, it is fed into the sludge receiving cone.

The sludge is moved to the zone of action of the cleaning agent (upper edge of the nozzle 4) by mechanical means due to the axial load and rotation of the drill string. The limiting grate 12 prevents large pieces of cuttings from getting into the slurry receiving cone of the projectile. The cutting blade is cooled during the pacing of the drilling tool.

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When worn off the snare piece. the cleaning agent enters the well and is regulated by the gap between the nozzle 4 and the nozzle 3. When setting the projectile on the bottom, the sludge intake cavity 11 is filled with sludge moved by the plates 8 and the leakage of industrial fluid into the annulus stops.

Claims (1)

The invention The tool for drilling wells with the transport of sludge through a double string of drill pipes, including a housing with a sludge intake cavity and an adapter for drill pipes, a restrictive grating, installed ten YU FIG. g / 46273 But in the slurry cavity, radial blades attached to the housing in the lower part of the rezushche with windows to communicate the external space with the slurry cavity, characterized in that, in order to increase the mechanical speed of drilling by improving cleaning 1Q of the bottom, it is provided with directional plates, and the inner walls of the windows are inclined to the axis of the body with the formation of a cone, the top of which is directed toward the bottom, and 15 guide plates are installed tangentially on the inner wall of the window with the possibility of scooping the slurry-intake cavity. P Type B YU U FSC