Downhole cutting tool
First Claim
Patent Images
1. A downhole cutting tool, comprising:
- a body member including a slot defined laterally therethrough and further including a longitudinal cavity having upper and lower ends defined therein in communication with said slot;
first and second cutting members each having angled and lower edges and being pivotally mounted in opposed orientation in said slot;
first piston means disposed in said cavity adjacent and proximate to the angled edges of said first and second cutting members;
second piston means disposed in said cavity adjacent and proximate to the lower edges of said first and second cutting members; and
fluid control means responsive to an increase in fluid pressure in said cavity to force said first and second piston means into said first and second cutting members thereby to spread the first and second cutting members outward through the slot on respective opposite sides of the body member into cutting attitude.
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Abstract
A downhole cutting tool for use down along a tubing string consisting of an elongate body member having central cavity and transverse slotway and receiving drilling fluid axially therethrough. An expandable double blade is pivotally housed in the slotway while fluid actuated pistons above and below are effective to expand the blades outboard on each side and to brace the blades in operative position as the body member is rotated and the blades abrade or cut the adjacent material.
170 Citations
14 Claims
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1. A downhole cutting tool, comprising:
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a body member including a slot defined laterally therethrough and further including a longitudinal cavity having upper and lower ends defined therein in communication with said slot; first and second cutting members each having angled and lower edges and being pivotally mounted in opposed orientation in said slot; first piston means disposed in said cavity adjacent and proximate to the angled edges of said first and second cutting members; second piston means disposed in said cavity adjacent and proximate to the lower edges of said first and second cutting members; and fluid control means responsive to an increase in fluid pressure in said cavity to force said first and second piston means into said first and second cutting members thereby to spread the first and second cutting members outward through the slot on respective opposite sides of the body member into cutting attitude. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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2. A tool as defined in claim which is further characterized to include:
spring means normally urging said second piston means away from said lower edges of the first and second cutting members.
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11. A downhole cutting tool, comprising:
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an elongate body member having upper and lower ends and including a slot defined laterally therethrough; a cutting assembly pivotally retained within said body member slot; first piston means disposed above said cutting assembly and actuatable to force said cutting assembly radially outward into operative position; and second piston means disposed below said cutting assembly and actuatable simultaneously with said first piston means actuation to reinforce said cutting assembly radially outward into operative position. - View Dependent Claims (12, 13, 14)
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Specification