Multi-purpose drilling tool

Details Multi-purpose drilling tool Multi-purpose drilling tool

E - Fixed Constructions

21

B

E21B 10/64 (2006.01) E21B 10/32 (2006.01) E21B 23/00 (2006.01) E21B 29/00 (2006.01)

Patent

CA 2185718

The present invention relates to a multipurpose drilling tool that may be cycledbetween drilling and underreaming operations while situated in a well bore. Morespecifically, the present invention provides a multi-purpose tool in the form of a housing member comprising a central bore, four extensible underreaming blades and means for attaching a standard drill bit. The ability of the multipurpose drilling tool to cycle between drilling and underreaming modes is provided by means of a piston which is motivated downwardly and rotationally by fluid pressure and is directed by a piston travel guide from a first relaxed position to either a drilling position or an underreaming position. The present invention enables cycling of the tool within the well bore without requiring the removal of the tool and drilling string from a well bore, thus increasing the efficiency of drilling operations.

La présente invention a trait à un outil de forage à usages multiples qui peut alterner entre les travaux de forage et d'élargissement dans un trou de forage. De manière plus précise, la présente invention fournit un outil à usages multiples sous la forme d'un boîtier comprenant un alésage central, quatre lames d'élargissement extensibles et un moyen de fixation d'un outil de forage standard. La capacité de l'outil de forage à usages multiples d'alterner entre les modes de forage et d'élargissement est obtenue à l'aide d'un piston poussé vers le bas et mis en rotation sous l'effet de la pression du fluide, et qu'un guide de déplacement dirige à partir d'une position de repos soit vers la position de forage, soit vers la position d'élargissement. La présente invention permet d'utiliser en alternance l'outil dans le trou de forage sans qu'il ne soit nécessaire d'enlever l'outil et le train de tubes d'un trou de forage, ce qui accroît l'efficacité des travaux de forage.

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