A three-cone drill bit for horizontal wells and hard formation wells

Abstract

A tricone rock bit for horizontal wells and hard formation wells includes three head sections and three cones arranged at the lower ends of the head sections, where the supper parts of the three head sections are connected together to form one integrated drill bit body; jet nozzle bosses are arranged between the head sections on the drill bit body; jet nozzles are mounted in nozzle holes of the jet nozzle bosses; gauge cutting elements are arranged on the top rear of the OD of the head sections, forming a gauge surface on the top of the head sections; the front face of the head sections is a ruled surface, inclining backwards at an angle α, and inclining outwards at an angle β. The tricone rock bit has low lateral vibrations, high stability, good effects of bottom hole cleaning and cutting element cooling, long service life and high penetration rate.

Description

Technical field [0001] The invention relates to a tri-cone drill bit, in particular to a tri-cone drill bit used for horizontal wells and hard formation wells, and belongs to the technical field of geological drilling and petroleum drilling. technical background [0002] The existing tri-cone drill bit usually includes a bit body with three palms on the bit body. The cones are installed on the inclined palm axis at the lower end of the palms. The cones have steel teeth or cemented carbide inserts. The fluid enters the bit runner from the drill string and then sprays out from three nozzles. The nozzle is installed in the nozzle seat, and the nozzle seat is arranged on the back side of the tooth palm. After the drilling fluid hits the bottom of the well, it returns from both sides of the nozzle seat. There are three points on the outer row of 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 wel...

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

Images