Drilling and hole enlargement device

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/34 (2006.01) E21B 10/26 (2006.01)

Patent

CA 2573891

An expandable drilling apparatus is deployed upon a distal end of a drillstring and includes a cutting head and a substantially tubular main body adjacent the cutting head providing a plurality of axial recesses configured to receive arm assemblies configured to translate between a retracted and an extended position. A flow switch actuates the arm assemblies when a drilling fluid pressure exceeds an activation value and the drilling apparatus includes a biasing meinber to reset the arm assemblies when the drilling fluid pressure falls below a reset value.

Un dispositif de forage extensible est déployé sur une extrémité distale d'un train de tiges et comprend une tête de coupe et un corps principal essentiellement tubulaire contigu à la tête de coupe fournissant plusieurs retraits axiaux configurés pour recevoir des ensembles de bras configurés pour translater entre une position rétractée et une position allongée. Un commutateur de débit actionne les ensembles de bras si une pression du fluide de forage dépasse une valeur d'activation et le dispositif de forage comprend un élément en biais pour réenclencher les ensembles de bras si la pression du fluide de forage devient inférieure à une valeur de réenclenchement.

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