US 11,840,891 B2
Cutting elements with modified diamond surface
John Daniel Belnap, Lindon, UT (US); and Yahua Bao, Orem, UT (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Appl. No. 17/270,127
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Aug. 21, 2019, PCT No. PCT/US2019/047447
§ 371(c)(1), (2) Date Feb. 22, 2021,
PCT Pub. No. WO2020/041432, PCT Pub. Date Feb. 27, 2020.
Claims priority of provisional application 62/722,209, filed on Aug. 24, 2018.
Prior Publication US 2021/0172257 A1, Jun. 10, 2021
Int. Cl. E21B 10/567 (2006.01); C04B 35/528 (2006.01); C04B 35/645 (2006.01); C04B 41/00 (2006.01); C04B 41/50 (2006.01); C04B 41/87 (2006.01)
CPC E21B 10/5673 (2013.01) [C04B 35/528 (2013.01); C04B 35/645 (2013.01); C04B 41/009 (2013.01); C04B 41/5057 (2013.01); C04B 41/87 (2013.01); E21B 10/567 (2013.01); C04B 2235/427 (2013.01); C04B 2235/442 (2013.01)] 20 Claims
OG exemplary drawing
 
10. A method for making a cutting element comprising the steps of:
subjecting a volume of diamond grains to an HPHT sintering condition in the presence of a carbonate material and in the absence of a substrate to form a carbonate polycrystalline diamond body comprising a matrix phase of intercrystalline bonded diamond and a plurality of interstitial regions dispersed within the matrix phase comprising the carbonate material;
combining the carbonate polycrystalline diamond body with matrix casting precursor materials and subjecting the combination to an elevated temperature to form a matrix casting that is mechanically coupled to the carbonate polycrystalline body, wherein a surface portion of the carbonate polycrystalline diamond body is exposed from the matrix casting; and
treating the exposed surface portion of the carbonate polycrystalline diamond body to increase the compressive residual stress of the surface portion;
wherein the exposed surface portion comprises a compressive residual stress that is greater than the residual stress of at least a region of a remaining portion of the carbonate polycrystalline diamond body, and wherein the at least a region of the remaining portion of the carbonate polycrystalline diamond body that is not exposed has a compressive residual stress of less than about 100 MPa.