Reaming tool suitable for running on casing or liner
AssigneeBaker Hughes Incorporated
InventorsLester I. Clark, John C. Thomas, Jeffrey B. Lund, Eric E. McClain
Life of this patent
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Abstract
A reaming tool includes a tubular body having a nose portion with a concave center. A plurality of blades defining junk slots therebetween extend axially behind the nose and taper outwardly from the exterior of the tubular body. Rotationally leading edges of the blades carry a plurality of cutting elements from the axially leading ends. Selected surfaces and edges of the blades bear tungsten carbide, which may comprise crushed tungsten carbide. The shell of the nose is configured to ensure drillout from the centerline thereof toward the side wall of the tubular body. A method of drilling out a reaming tool is also disclosed.
Claims29
A reaming tool, comprising:
- a substantially tubular body having a concave nose portion extending to a side wall through a substantially arcuate shoulder transition region;
- a plurality of circumferentially spaced, spirally configured blades on an exterior of the body extending from proximate the shoulder transition region and defining junk slots therebetween, an axially leading end of each blade commencing with substantially no standoff and tapering radially outwardly to a portion having a substantially constant standoff and having a radially inwardly extending, beveled, axially trailing end;
- and
- cutting structure configured and positioned on the side wall of the substantially tubular body for contact with a bore hole side wall, the cutting structure comprising a plurality of cutting elements disposed along a rotationally leading edge of each blade of the plurality proximate an axially leading end thereof.
A reaming tool, comprising:
- a substantially tubular body having a concave nose portion having no blades extending thereover and being devoid of cutting structure thereon, the concave nose portion extending to a side wall through a substantially arcuate shoulder transition region;
- a plurality of circumferentially spaced, spirally configured blades on an exterior of the body extending from proximate the shoulder transition region and defining junk slots therebetween, an axially leading end of each blade commencing with substantially no standoff and tapering radially outwardly to a portion having a substantially constant standoff and having a radially inwardly extending, beveled, axially trailing end;
- and
- cutting structure disposed along a rotationally leading edge of each blade of the plurality proximate an axially leading end thereof.
Dependencies are inferred from the claim text.