By increasing penetration rates and bit life, especially in hard formation, the use of down-hole air hammers in the oil field has significantly reduced drilling costs in the Northeast U.S. and West Texas (Ref. 1). Unfortunately, drilling by this percussion method has been limited mostly to straight hole applications. This paper presents a new concept of a percussion drilling tool which performs both the function of a down-hole hammer as well as that of a down-hole motor. Such a drilling tool, being introduced here as Steerable Percussion Air Drilling System (SPADS), eliminates the necessity to rotate the drill string and, consequently, enables the use of down-hole air hammers to drill directional wells.
Steerable percussion air drilling system
1998
Seiten
Aufsatz (Konferenz)
Datenträger
Englisch
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