Downhole reamer asymmetric cutting structures
AssigneeSmith International, Inc.
InventorsNavish Makkar, Tommy G. Ray, Manoj Mahajan, Dwayne P. Terracina, Sameer Bhoite
Life of this patent
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Abstract
A cutting structure for use with a reamer in enlarging a borehole in a subterranean formation includes a plurality of cutter blocks, radially extendable from a reamer body away from a central axis of the reamer body, each of the plurality of cutter blocks comprising at least one cutter blade thereon, wherein an angular spacing about the central axis of the reamer body between the at least one cutter blade on each of the plurality of cutter blocks is unequal.
Claims26
A cutting structure for use with an expandable reamer in enlarging a borehole in a subterranean formation, the cutting structure comprising:
- a plurality of cutter blocks radially extendable from a reamer body away from a central axis of the expandable reamer, each of the plurality of cutter blocks comprising at least one cutter blade thereon;
- a first cutter blade on each of the plurality of cutter blocks each defining a leading cutter blade with respect to a direction of rotation;
- and
- a plurality of cutting elements disposed on the at least one cutter blade, wherein the plurality of cutting elements include cylindrically bodied cutting elements having a working surface geometry of at least one selected from a dome-shaped working surface and a conical working surface, and wherein the plurality of cutter blocks and plurality of cutting elements define a cutting structure that is asymmetric.
A cutting structure for use with an expandable reamer in enlarging a borehole in a subterranean formation, the cutting structure comprising:
- an odd number of cutter blocks, each cutter block radially extendable from a reamer body away from a central axis of a reamer body and including multiple cutter blades thereon;
- wherein spacing between the multiple cutter blades is varied;
- and
- a plurality of cutting elements disposed on each of the multiple cutter blades, wherein the plurality of cutting elements have a non-planar diamond working surface.
A cutting structure for use with an expandable reamer in enlarging a borehole in a subterranean formation, the cutting structure comprising:
- a plurality of cutter blocks radially extendable from a reamer body away from a central axis of the reamer body, each of the plurality of cutter blocks including multiple cutter blades disposed thereon;
- and
- an angular spacing about the central axis of the reamer body between at least one cutter blade on each of the plurality of cutter blocks is unequal;
- and
- a plurality of cutting elements disposed on each of the multiple cutter blades, wherein the plurality of cutting elements include a cemented tungsten carbide element.
Dependencies are inferred from the claim text.