E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/15
E21B 43/112 (2006.01)
Patent
CA 1075146
WELL CASING PERFORATOR Abstract of the Disclosure A well casing perforator adapted to be used with pneumat- ically powered rotary drilling equipment. It includes an upright elongated body which is inserted within the casing. The body is attached to the lower end of a drill rod which imparts vertical or angular movement to the elongated body while within the casing. The body is guided axially within the casing by rollers which engage the interior casing wall. A rotatable wheel has teeth cap- able of penetrating the casing wall is the wheel rolls in engage- ment with the casing. The wheel is mounted at the outer end of a carrier pivoted to the elongated body about a horizontal axis. The carrier in turn is controlled by a piston assembly subject to pneumatic pressure within the drill rod. The piston assembly is pivotally connected to the carrier to move it from a first posi- tion at which the wheel is retracted from engagement with the casing to a second position at which the wheel engages the interior wall of the casing. Upon subsequent downward movement of the body, the wheel and carrier are moved to a third position at which the wheel teeth penetrate the casing as the wheel rolls with its teeth in engagement through the casing. Upward movement of the elong- ated body following release of pneumatic pressure in the drill rod permits return of the carrier and wheel to their original retracted position. - 1-
306283
Baum Art
Jerome Robert J.
LandOfFree
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