Halliburton Energy Services, Inc.

Turbopower Drilling Sal

Pascal Michel Vitale

Andrew McPherson Downie

Bachar Boussi

Andrew Mcpherson Downie

A downhole stabilizer (), such as a drill motor stabilizer, comprises at least one reaming means and/or reinforcing means (). The present invention also relates to an assembly (), such as a downhole drilling assembly (), comprising at least one such stabilizer () and/or a drill bit () comprising a gauge bit () at or near a drilling end () thereof, and a connection means () for connecting the drill bit () to a drill motor assembly (), wherein the drill bit gauge () comprises a substantially cylindrical portion having a length less than or equal to approximately 1.0 times the nominal bit diameter. The present invention also relates to a novel locking mechanism (), such as a lock and key mechanism, to allow locking of a shaft ('), e.g. a motor drive shaft (&#x2032;), through or together with a stabilizer (&#x2032;).

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Eybens, France

Pascal Michel Vitale