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US 10,378,288 B2Granted
Downhole drill bit incorporating cutting elements of different geometries
AssigneeSchlumberger Technology Corporation
InventorsDavid R. Hall, John D. Bailey, Ronald B. Crockett
Life of this patent
Estimating the term…
Abstract
A downhole cutting tool may include a tool body, a plurality of blades extending from the tool body, and a plurality of cutting elements coupled to the blades. The plurality of cutting elements may include one or more cutting elements having a working end of a first geometry (e.g., a pointed geometry) and one or more cutting elements having a working end of a second geometry (e.g., a planar geometry).
Claims22
A downhole cutting tool, comprising:
- a tool body;
- a plurality of blades extending from the tool body;
- and
- a plurality of cutting elements coupled to the plurality of blades and which collectively define a cutting profile when the plurality of blades are superimposed on each other, the plurality of cutting elements including:
- a first cutting element having a working end of a first geometry, the first cutting element being oriented at a non-zero side rake;
- and
- a second cutting element having a working end of a second geometry that is different than the first geometry, the first cutting element rotationally trailing the second cutting element and the first and second cutting elements overlapping in the cutting profile, and a central axis of the second cutting element being radially or angularly offset from a central axis of the first cutting element when the plurality of blades are superimposed on each other.
4 more elements
A fixed cutter drill bit, comprising:
- a tool body;
- a plurality of blades extending from the tool body;
- and
- a plurality of cutting elements coupled to the plurality of blades, the plurality of cutting elements including:
- a plurality of pointed cutting elements including a working end with a substantially pointed geometry that is opposite a first base;
- and
- a plurality of shear cutters on a second blade of the plurality of blades, the plurality of shear cutting elements including a working end with a planar cutting surface opposite a second base, and an innermost shear cutting element of the plurality of shear cutting elements being nearer a center of a working face of the tool body than an innermost pointed cutting element of the plurality of pointed cutting elements.
4 more elements
A downhole cutting tool, comprising:
- a tool body;
- a plurality of blades extending from the tool body, each of the plurality of blades extending radially inwardly from a gauge of the tool body toward a central axis of the tool body;
- and
- a plurality of cutting elements coupled to the plurality of blades and which collectively define a cutting profile when the plurality of blades are superimposed on each other, the plurality of cutting elements including:
- at least one first cutting element in a nose or flank of the cutting profile and having a working end of a first geometry having a pointed end and a side wall that is flat in a cross-sectional view, the at least one first cutting element being oriented at a non-zero back rake angle and at a non-zero side rake angle;
- and
- at least one second cutting element having a working end of a second geometry that is different than the first geometry, and which leads the at least one first cutting element and which overlaps the at least one first cutting element in the cutting profile.
4 more elements
Dependencies are inferred from the claim text.