RU1783108C - Drill bit - Google Patents

Abstract

Usage: tool for drilling oil and gas wells. SUMMARY OF THE INVENTION: A chisel comprises a body with flushing channels and blades. The latter are made with steps of curvilinear shape in the form of segments mating in the axial section. The front faces of the segments are reinforced with cylindrical rock-breaking elements. The distance from the mating point of the segments to the axis of the bit is less than the largest radii of the segments. 2 ill.

Description

The invention relates to drilling equipment, namely to paddle rock cutting tools for drilling wells for various purposes.

The aim of the invention is to increase the drilling speed by reducing the energy intensity of the bit.

In FIG. 1 shows a General view of the drill bit, section; FIG. 2 is a view along arrow A in FIG. 1.

The bit comprises a housing 1 having a flushing channel 2, and blades 3, on which steps 4 are made in the form of mating segments. The mating point 5 of adjacent segments is located relative to the axis 6 of the bit at a distance less than the largest radii of the mating segments. A calibrating surface 7 is located above the last stage 4 of each blade. 3 bits. The front faces of the blade 5 blades are reinforced with cylindrical rock-cutting elements 8.

The operation of the drill bit is as follows. When drilling, axial load and torque are transmitted to the bit. Under their influence the front

cutting edges of steps of 4 bits destroy the rock. Moreover, due to the execution of the stages 4 of the bit in the form of mating segments reinforced with cylindrical rock cutting elements 8. along the entire height of the blades 3 in the largest cross section of each of the stages 4, the point contact of their calibrating sections with the walls of the wells is provided. As a result, the destruction of the rock occurs at a small torque, which reduces the energy intensity of the bit and creates the possibility of drilling with an increased axial load on the bit, thereby increasing the drilling speed. In addition, the location of the mating point 5 of the adjacent segments of the steps 4 relative to the axis 6 of the bit at a distance shorter than the largest radii of the mating segments provides duplicate overlap along the radius of the bit of the calibrating sections of the steps with the armament of the corresponding upstream steps.

The proposed drilling bit has the following advantages in comparison with the prototype: an increase in the drilling speed is provided due to a decrease in the torque

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Claims (1)

bit intensity and enabling operation at increased axial load; the rational choice of the type of downhole motor is expanded by reducing the requirements for the magnitude of the generated torque; it makes it possible to efficiently use a blade bit in various geological conditions, including the drilling of deviated wells. SUMMARY OF THE INVENTION A drill bit comprising a body with flushing channels and blades with curvilinear foams, the front faces of which are reinforced with cylindrical rock-cutting elements, characterized in that, in order to increase the drilling speed by reducing the energy intensity of the bit, the steps of the blades in the axial section of the bit are made in the form of mating segments, the interface of the segments being located relative to the axis bits at a distance shorter than the largest radii of the mating segments. view Ft. 2.