Three-cone bit for horizontal well and hard formation well

Abstract

The invention relates to a tricone bit for a horizontal well and a hard formation well. The tricone bit comprises three palms and cones arranged on the lower ends of the palms. The upper parts of the three palms are integrated to form a bit body, nozzle holders are arranged between the palms of the bit body, and nozzles are arranged in the jet orifices of the nozzle holders. The invention is characterized in that radius holding teeth are arranged on the back upper parts of the backs of the palms to form radius holding planes on the upper parts of the palms, and the front side faces of the palms deflect backwardly integrally. The radius holding points arranged on the back upper parts of the backs of the palms strengthen the drilling stability of the bit and reduce transverse vibration. And therefore, the bit is not easily deviated when drilling a horizontal well, thereby improving the effective service life of the tricone bit. The front side faces of the palms backs deflect backwardly integrally, thereby promoting the up returning of the rock debris with the slurry, and facilitating the improvement of the drilling efficiency. The jet direction of each nozzle is led to the front side of a next cone, thereby reinforcing the cleaning of the bottom of the well and the cooling effect of the cone teeth, and bringing about relatively longer service life and higher mechanical drilling speed for the tricone bit.

Description

technical field [0001] The invention relates to a three-cone drill bit, in particular to a three-cone drill bit used for horizontal wells and hard formation wells, and belongs to the technical fields of geological drilling and oil drilling. technical background [0002] Existing tri-cone drill bits usually include a drill bit body with three palms on the drill body. The cone is installed on the inclined palm shaft at the lower end of the tooth palm. Fluid enters the flow path of the drill bit from the drill string, and is then sprayed out from three nozzles. The nozzle is installed in the nozzle seat, and the nozzle seat is arranged on the rear side of the palm. Drilling fluid hits the bottom of the well and returns from both sides of the nozzle seat. There are three points on the outer teeth of the bit cones that contact the well wall, and the contact points are on the front side of each cone. When drilling horizontal wells and hard formation wells, the roller cone bit h...

AI Technical Summary

Problems solved by technology

When drilling horizontal wells and hard formation wells, the roller cone bit has the following problems: rapid lateral movement and strong impact, causing the rotation center of the bit to deviate from its geometric center, accelerating the wear and fracture of the teeth, and even leading to early failure of the bearing; due to gravity If the removal of cuttings at the bottom of the well is not smooth, it will easily lead to the wear of the gear shell and the breakage or loss of teeth; the position of the water jet is not reasonable, so that the teeth cannot be cooled in time and the wear will be accelerated.

The diameter of the patented drilling wellbore is formed by cutting the back of the palm, which will reduce the rock breaking efficiency of the drill bit

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