Drilling and hole enlargement device

Details Drilling and hole enlargement device Drilling and hole enlargement device

E - Fixed Constructions

21

B

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

Patent

CA 2723505

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 member to reset the arm assemblies when the drilling fluid pressure falls below a reset value.

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