US 11,808,089 B2
Coatings to prevent cutter loss in steel body PDC downhole tools
Jianhui Xu, Dhahran (SA); and Guodong (David) Zhan, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Aug. 21, 2020, as Appl. No. 16/999,429.
Prior Publication US 2022/0056766 A1, Feb. 24, 2022
Int. Cl. E21B 10/42 (2006.01); E21B 10/46 (2006.01); E21B 10/567 (2006.01); E21B 10/55 (2006.01); E21B 10/573 (2006.01); B23K 1/00 (2006.01); B23K 1/20 (2006.01); C23C 30/00 (2006.01); B23K 101/00 (2006.01)
CPC E21B 10/5735 (2013.01) [B23K 1/0008 (2013.01); B23K 1/20 (2013.01); C23C 30/005 (2013.01); B23K 2101/002 (2018.08); E21B 10/55 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of preventing or reducing cutter loss in a steel body polycrystalline diamond compact (PDC) drilling tool, the method comprising:
applying a hardfacing layer on a surface of a PDC cutter pocket to form a covered PDC cutter pocket, the hardfacing layer comprising a metal binder and coated tungsten carbide particles; and
bonding a PDC cutter into the covered PDC cutter pocket with a brazing material,
wherein the coated tungsten carbide particles comprise tungsten carbide particles and a coating comprising tungsten metal, titanium metal, a tungsten alloy, a titanium alloy, or mixtures thereof,
wherein the coating has a thickness of 10 to 50 nm.