Abnormal torque absorber for drilling
Accelerator for fishing jar with hydrostatic assist
Adjustable fishing jar
Adjustable kelly bushing for downhole drilling system
Anchor and method of setting anchor
Anchoring bolt and method
Annular air hammer apparatus for drilling wells
Annular air-hammer apparatus for drilling holes
Apparatus for connecting motors in tandem
Apparatus for establishing an anchor
Apparatus for handling pipe at well site
Apparatus for handling pipe at well site
Apparatus for positioning a split retaining ring in a down-hole
Apparatus for racking drill pipes on floater type platforms
Apparatus for supporting a drilling platform on the ocean floor
Auto set bi-directional jar
Automatic sequential dual action sealing system
Backhead and check valve for down-hole drills
Backhead and check valve for down-hole drills
Backhead and drill assembly with backhead