Abstract: A multi-sectional percussive drill bit assembly for drilling holes in earth formation primarily used in conjunction with a pneumatic percussive device. The drill bit assembly is comprised of an easily removable bit that is rotationally driven by a lug and pocket structure and axially limited in travel by means of retaining members.

Abstract: A multi-sectional percussive drill bit assembly for drilling holes in earth formation primarily used in conjunction with a pneumatic percussive device. The drill bit assembly is comprised of an easily removable bit that is rotationally driven by a lug and pocket structure and axially limited in travel by means of retaining members.

Abstract: This invention provides a method of creating air pressure by generating a source of air pressure greater than atmosphere air pressure from a first rotary screw compressor. The first rotary screw compressor has a first displacement and is driven by a first power source. The generated source of air pressure from the first rotary screw compressor is directed to a second rotary screw compressor having a second displacement which is less than the first displacement and which is driven by a second power source which is independent of the first power source. The generated air pressure from the second rotary screw compressor driven by the second power source is greater than 200 psi.

Abstract: A keyseat wiper or reamer for enlarging keyseats which are often formed in drilling bores during well drilling operations. The wiper comprises a generally cylindrical body including a cylindrical middle guard portion which has a greater cross-sectional diameter than the greatest diameter of the cutting elements of the tool, the middle portion being free of any cutting elements. Cutting elements extend in a tapered manner from the middle portion to opposed locations toward the ends of the wiper. Because the middle guard portion does not carry cutting elements and is the largest diameter portion of the keyseat wiper, the keyseat wiper will cut only when the hole through which it is passing is of diameter smaller than that of the middle guard portion or when the well bore has a curve or dogleg.