RU1799985C - Core bit for continuous coring - Google Patents

Abstract

Usage: drilling exploration wells. SUMMARY OF THE INVENTION: A crown consists of a body with a connecting thread, rock cutting sectors 2, separated by inclined sludge exhaust channels 3 connected to the annulus of the double core pipe through an opening in the outer surface of the housing. In each channel3, nozzles 4 are installed at an angle of 30th to the end plane. The axis of the nozzles 4 is at an angle of 40-45 [deg.] to the curved core surface at the point of contact. The outer surface of the housing is made with a groove 5 in front of the nozzle 4. 3 ill.

Description

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FIELD: mining. SUBSTANCE: invention relates to mining, in particular, to a rock cutting tool for drilling core hydrotransport wells.

The purpose of the invention is to increase the mechanical drilling speed and crown resource by improving the cleaning of the bottom of the well from sludge and cooling the crown.

This goal is achieved by the fact that in the proposed core for drilling with hydrotransport core, containing a housing with a working end with an internal core-forming surface and rock cutting sectors, separated by sludge channels, with vertical flushing channels equipped with nozzles installed so that the axis nozzles are directed to the center of the crown at an angle of 30 ° to the plane of the working end and in the direction opposite to the rotation of the crown at an angle of 40 to 45 ° to the tangent and inner core-forming surface at the point of intersection with the axis of the nozzle kernoobrazuyuschey surface between the inner tips of the faces of the sectors forming shlamootvod conductive channel, wherein the outer surface of the housing to a nozzle in the rotation direction of a longitudinal groove.

Such a structural solution of the crown contributes to the formation of additional ejection of the flushing agent from the annulus into the hydraulic transport channel, as well as providing the necessary lifting force to the drilled particles and core pieces. With this arrangement of nozzles, a helical (vortex) motion of the total flow at the inlet to the hydrotrans is formed. a tail channel, which ensures rotation of the core broken by a core breaker and its faster rise to the surface. The helical movement of the core pieces sharply reduces its self-jamming during lifting, since the core is oriented along the center of the internal hydrotransport pipe. The helical motion of the flow enhances its rotational motion, obtained from the rotation of the projectile.

The installation of nozzles in the center of the sludge discharge channels due to the turbulence of the flow contributes to the efficient cleaning of the bottom from drilled particles. A groove is used in front of the nozzle to enhance the movement of the suction stream of the flushing agent, to clean and cool the outside of the crown.

The location of the nozzle axes at an angle of 30 ° to the bottom allows efficient cleaning of the face with the main and ejected flow, as well as on the way from the nozzle

prior to entering the vertical channel, due to turbulence, ensure the transfer of energy from the main to the sucked-in and thereby create an ejection of the flow along the sludge-removing groove.

A decrease in the angle of inclination of the nozzles to the horizon will worsen the flow ejection, and an increase of more than 30 °, along with a decrease in ejection, will reduce the cleaning effect

care from drilled particles.

The location of the nozzles in the plan at an angle of 45 ° and close to it corresponds to the direction of screw movement by applying a rotational force to the core and its orientation in the center of the transport pipe. At a smaller angle, e.g. 35 °, the jet will bounce off the core plane, and at a larger angle, e.g. 50 °, the core column will not rotate.

In FIG. 1 shows the proposed crown from the side of the working end; in FIG. 2 is a section AA in FIG. 1: in FIG. 3 is a view B in FIG. 1.

The crown consists of a housing 1 with a single thread and a working end with an internal core-forming surface and rock-cutting sectors 2, separated by sludge-removing channels 3, directed in the direction of rotation and

connected to the annular space of the double core pipe 8 through inclined holes 6 and vertical channels 7 in the outer part of the housing 1. In the vertical channels 7, nozzles 4 are installed, and the axis of the nozzles are directed toward the center of the crown at an angle of 30 ° to the plane of the working end and in the direction towards the rotation of the crown at an angle from 40 to 45 ° to the tangent to the inner core-forming surface at the point of intersection of the axis of the nozzle 4 with the core-forming surface between the inner extremities of the faces of the sectors 2 forming the sludge water channel 3. On the outer surface of the housing V in front of the nozzle 4, a longitudinal groove 5 is made.

The crown works as follows. During rotation of the drill string, represented by a double pipe string with the proposed crown screwed onto the outer pipe, the flushing fluid flows from the mud pump through the annulus to the crown and is divided into two streams: one

the flow flows into an adjustable gap between the inner pipe and the crown into the hydrotransport channel to the surface, the second into the inclined hole 6 in the housing 1 and then along the vertical channel 7 in the outer part of the crown into the narrowing part - nozzle 4.

Outflow from nozzle 4 at a high speed at an angle of 30 ° to the face, due to turbulence, the flow ejects an additional stream of flushing agent mixed with drill cuttings on both sides of nozzle 4 located in the sludge outlet channel 3, as well as the flow through the groove 5 from the space between the surface of the borehole and the outer part of the crown, which affects the cooling of the crown and the improvement in cleaning of the face.

The location of the axes of nozzles 4 at an angle of 40-45 ° to the curved surface of the core being drilled 9 contributes to the formation of a vortex stream at the inlet of the mixed stream into the vertical internal grooves 10 of the sludge outlet channel 3 and further into the hydrotransport channel.

The location of the nozzles at an angle of 30 ° to the end surface of the crown and to the bottom gives lift to the mixed flow of flushing agent and sludge, and its vortex structure helps to accelerate the flow and screw-like movement of core pieces in the hydrotransport channel, which contributes to the centering of core pieces of hard rocks and reduce their self-jamming when climbing to the surface.

The use of a crown will allow for more effective cleaning of the bottom, removal of sludge and a decrease in self-jamming of the core to increase the mechanical

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Claims (1)

the speed is up to 25%, the resource of the crown is 1.25-1.5 times, which will ensure an increase in the efficiency from the use of crowns by 1.3-1.5 times, and the conditional effect of introducing the proposed crown within the country will be 100-150 thousand rubles. at a rate of 2000 crowns per year. SUMMARY OF THE INVENTION A core bit for hydrotransporting a core comprising a housing with an end face with an internal coring surface and rock-cutting sectors separated by sludge removal channels with vertical washing channels, characterized in that, with In order to increase the mechanical drilling speed and crown resource by improving the cleaning of the bottom of the well from sludge and cooling the crown, it is equipped with nozzles installed in vertical washing channels, with the axis of the nozzles directed towards the center of the crown at an angle of 30 ° to the plane of the working end and in the direction opposite to rotation .crowns at an angle from 40 to 45 ° to the tangent to the inner core-forming surface at the point of intersection of the axis of the nozzle with the core-forming surface between the inner ends of the faces of the sectors, a sludge outlet channel, and a longitudinal groove is made on the outer surface of the housing in front of the nozzle in the direction of rotation. FIG. Z View B Fi &.