BIT GUIDE AND PROTECTOR INCORPORATING AN ARRANGEMENT FOR INITIALLY INSERTING OR REPLACING OF BIT JETS

摘要

A guide and protector arrangement for a drill bit that has openings therein for receiving removable jets which includes jacket means for covering the bit cutting surfaces with access openings in the jacket means for insertion and removal of the bit jets. Fluid passage means are provided in the jacet means for communicating with the well bore at one end and the access openings at the other end, and a closure means is provided for the access opening after the jets have been positioned in the bit.