Underreamer with simultaneously expandable cutter blades and method
This patent describes a downhole cutting tool. It includes upper and lower body portions having a longitudinal passageway extending therethrough, the body portions having cutter blade slots extending transversely therethrough, spaced apart and at a right angle to each other, the slots intersecting the longitudinal passageway, an upper pair of cutter blade members pivotally mounted in the upper slots, a lower pair of cutter blade members pivotally mounted in the lower slots, an upper piston member slidably received in the longitudinal passageway above the upper slots and engaging the upper cutter blade members for moving the same between a retracted position within the upper slots and an extended position outward therefrom. This patent also describes a method of cutting material located within a borehole having a tubing disposed therein. It includes lowering an under-reamer tool into the tubing, which underreamer tool includes; an upper piston member responsive to pressurized fluid operatively connected to an upper pair of cutter blade members movable below the tubing to an extended position in response to a pressurized fluid, and a lower piston member responsive to pressurized fluid operatively connected to a lower pair of cutter blade members movable below the tubing to an extended position in response to a pressurized fluid.
- Assignee:
- Slimdril International, Inc., Houston, TX (United States)
- Patent Number(s):
- US 5090480; A
- Application Number:
- PPN: US 7-633687
- OSTI ID:
- 5289636
- Country of Publication:
- United States
- Language:
- English
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