Apparatus and method for acquiring information while drilling

E - Fixed Constructions – 21 – B

Patent

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E21B 47/01 (2006.01) E21B 17/10 (2006.01)

Patent

CA 2488302

An apparatus and method useful for acquiring information from a subsurface formation penetrated by a wellbore contemplate the use of a tubular body adapted for connection within a drill string disposed in the wellbore. The tubular body is equipped with one or more protuberances (e.g., ribs) defining an expanded axial portion. A probe is carried by the tubular body at or near a first location within the expanded axial portion of the body where the cross-sectional area of the expanded axial portion is a minimum. The probe is movable between retracted and extended positions. In another aspect, the inventive apparatus may further include a cover releasably-secured about the probe for protecting the probe while drilling. In a further aspect, the inventive apparatus may include a shearable backup support carried by the tubular body azimuthally opposite the probe permitting release of the apparatus from the wellbore in the event of a failure. In yet another aspect, the probe is at least partially carried within a debris-clearing channel formed in a protruding portion of the tubular body to promote fee movement of the probe within the wellbore.

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