Cutting elements comprising partially leached polycrystalline material, tools comprising such cutting elements, and methods of forming wellbores using such cutting elements
US9863189B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2014 |
| Grant date | Jan 9, 2018 |
| Priority date | — |
| Expiry date | Mar 24, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C26/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An earth-boring tool includes a cutting element having a first volume of polycrystalline material including catalyst material and a second volume free of catalyst material. A boundary between the first volume and the second volume is nonlinear in a cross-sectional plane that includes a centerline of the cutting element and an anticipated point of contact of the cutting element with the surface of the formation to be cut. Each line tangent the boundary in the cross-sectional plane forms an angle with the centerline of the cutting element greater than the contact back rake angle of the cutting element. In some cutting elements, some portions of the boundary may have another selected shape. Some cutting elements have a boundary wherein tangent lines form angles of greater than 20° with the centerline of the cutting element. Methods of forming wellbores are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.