RU1795071C - Roller-cutter drilling bit - Google Patents

Abstract

Usage: drilling wells with ball bits. SUMMARY OF THE INVENTION: A chisel includes a body with trunnions on which cones are mounted, made with radial channels, the outlet openings of which are located in the interdental cavities and the interdental grooves. The axle has a longitudinal channel communicated with the body cavity through the channel in the leg and with the radial cone channels through the radial channels made in the axle. The gland formed during drilling in the suprahepatic cavity is destroyed by jets of fluid that are pulsed through the radial channels executed in the cones . 3 ill.

Description

The invention relates to well drilling, and in particular to cone drill bits:

Known cone drill bit, comprising a housing in the form of interconnected paws with pins, mounted on the pivots of the cone and the cooling system. nor supports in the form of last channels isolated from the cavities in the paws and pins with outlet openings on the outer surfaces of the paws.

The disadvantage of this washing (purging) scheme is that the cleaning agent exiting the canal at the back of the legs is directed only to cooling the supports. He does not take any part in the cleaning of weapons and the plane of the face of drill cuttings.

A cone drill bit is also known, comprising paws with trunnions, at least one of which has a flushing channel that branches when leaving the trunnion to hoses.

The disadvantage of this bit is the increased turbulization and mutual extinguishment of the flushing (purge) flows in the center of the bottom and insufficient cleaning of the most sludge-loaded peripheral zone of the bottom, which will inevitably lead to uneven wear of the weapons. . The closest in technical essence and the achieved result with respect to the claimed is a cone drill bit containing paws with trunnions, on which cones with rock cutting elements are mounted by bearings, moreover, the trunnion is made with axial and radial channels for supplying the cleaning agent, and cone with radial channels combined with radial channels of the journal, the output part of which is located between the rock-destructive elements.

The disadvantage of this flushing scheme is the local effect of the cleaning agent on the face plane and the armament of Chael C

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dippers, which will lead to omental formation on the bit.

The aim of the invention is to increase drilling efficiency by improving the cleaning of the weapons of the cone and the entire bottomhole zone, especially when sinking rocks prone to gland formation. During the operation of the bit, the kinetic energy of the jets of the cleaning agent is rationally used, complete and uniform cleaning of the bottom from the sludge and the armament of the bits from the stuffing box, uniform cooling of the working elements of the bit,

This goal is achieved by the fact that in the cone drill bit containing a body with paws and pins, cones mounted on trunnion pins with crowns and radial channels and a flushing system including axial and radial channels in the lower part communicating with the body cavity and radial channels in the roller cone discharged into the interdental cavities, trunnions and cones are made with additional radial channels, the outlet openings of which are located on the trunnion in its upper part, and on the cone in interventional grooves, moreover, nye radial channels on the journal and cutter are in communication with each other and with the flushing system ..

In FIG. 1 shows a general view of a cone drill bit; in FIG. 2 is a section AA in FIG. 1; in FIG. 3 is a view B in FIG. 1.

Drill bit consists of a housing 1, a valve 2 with trunnions 3, On the trunnions 3 by means of bearings 4 mounted cones 5 with working crowns of weapons

6 and flushing (flushing) radial channels 7. The system for flushing the bit includes an axial channel 8 of a pin 5 and its radial channels 9. Radial channels 9 of a pin 3 communicate with radial channels

7 cones 5. Radial channels 7 cones

ki 5 are alternately brought to the outer surface of the cone into the interdental cavities 10, and additional radial channels 11 into the interventional grooves 12,

The bit works as follows,

After it is lowered into the well, a cleaning agent is fed into the cavity of the bit body. Through the radial channel 7, the cleaning agent enters the trunnion trunnion 3. In this case, cooling and lubrication of the friction surfaces of the support occur. Further along the radial channels 7 and the additional radial channels 11, the treatment agent enters in equal portions into the interdental cavities 10 and the cone grooves 12 of the cone 5. Such a distribution of bottom-hole flows of the treatment agent makes it possible to evenly cool the support and distribute the treatment agent over the entire plane of the face. agents leaving the additional channels 11 are aimed at arming adjacent cones, which allows washing away the sludge from the armament and minimizing its time in the area of operation of the bit. The kinetic energy of the cleansing agent and weapons simultaneously affects the pre-fracture zone, as a result of which the bit armament works on a practically clean bottom. This circumstance is especially important when drilling soft rocks that are prone to gland formation such as Western Siberia, where the prevention of the formation of oil seals in service and internal bit seals is crucial for drilling efficiency.

All of the above factors increase the technical and economic performance of drilling and bit stability.

The proposed technical solution can be used not only in cone, but also in other types of bits, especially when working in rocks prone to gland formation.

Claims (1)

SUMMARY OF THE INVENTION A cone drill bit comprising a body with paws and trunnions mounted on trunnion trunnions with rims and radial channels and a flushing system including axial and radial channels in the lower part communicating with the body cavity and radial channels in the roller cutter led into the interdental cavities characterized in that, for the purpose of to increase the efficiency in work when drilling on rocks prone to gland formation, the trunnions and cones are made with additional radial channels, the outlet openings of which on the trunnion are located in its upper part, and on the cone in interventional grooves, with additional radial channels on the trunnion and cone communicated with each other and with the flushing system. FIG. 2