E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/29
E21B 17/10 (2006.01) E21B 7/04 (2006.01) E21B 17/07 (2006.01)
Patent
CA 1256095
ABSTRACT OF THE DISCLOSURE A combination shock tool and integral blade stabilizer or reamer includes a housing defining a longitudinal axis and having a mandrel slidably disposed therein for movement along the longitudinal axis of the housing in response to shock loadings in the axial direction. The mandrel has a diameter less than that of the housing and a portion of the mandrel extends outwardly of one end of the housing. Coupling means is provided on an end portion of the outwardly extending mandrel portion for effecting a connection to a drill bit, and further coupling means on the housing is included for effecting a connection thereof to the lower end of a drill string. The housing and the end portion of the mandrel each also have an integral blade stabilizer or reamer thereon adapted to engage and be supported by the bore of a well being drilled whereby the outwardly extending mandrel portion is relatively close to the support point created by engagement of the integral blade stabilizer or reamer on the mandrel end portion with the well bore during use thus helping to avoid high bending moments and deflection in the mandrel during use.
535096
Gowling Lafleur Henderson Llp
Heffco Resources Inc.
LandOfFree
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