US 12,076,798 B2
Tools and methods for refacing tubular ends forming a threaded connection
Floyd Martin, Navasota, TX (US); Andrei Muradov, Houston, TX (US); Edgar Stokley, Montgomery, TX (US); and Dan Morgan, Navasota, TX (US)
Assigned to National Oilwell Varco, L.P., Houston, TX (US)
Appl. No. 18/021,148
Filed by National Oilwell Varco, L.P., Houston, TX (US)
PCT Filed Aug. 20, 2021, PCT No. PCT/US2021/046889
§ 371(c)(1), (2) Date Feb. 13, 2023,
PCT Pub. No. WO2022/051115, PCT Pub. Date Mar. 10, 2022.
Application 18/021,148 is a continuation in part of application No. 17/012,838, filed on Sep. 4, 2020, granted, now 11,400,525, issued on Aug. 2, 2022.
Prior Publication US 2023/0321735 A1, Oct. 12, 2023
Int. Cl. B23B 51/10 (2006.01); B23B 5/16 (2006.01)
CPC B23B 51/103 (2013.01) [B23B 5/161 (2013.01); B23B 2220/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A tool for refacing a tubular end having an inner shoulder, an outer shoulder, and threads for forming a connection, the refacing tool comprising:
a feed assembly;
cutters coupled to the feed assembly so as to move in unison with the feed assembly, the cutters being positioned so as to reface the inner shoulder or the outer shoulder of the tubular end;
a rotating assembly, the rotating assembly passing through the feed assembly, and the feed assembly being capable of sliding relative to the rotating assembly;
a mandrel assembly coupled to the rotating assembly, the mandrel assembly including threads configured to directly complement and engage the threads of the tubular end;
a locking pin coupled to the rotating assembly so as to slide between a first position, wherein the locking pin does not engage the mandrel assembly, and a second position wherein the locking pin engages the mandrel assembly and prevents rotation of the mandrel assembly relative to the rotating assembly; and
a cam coupled to the rotating assembly so as to slide between an unlock position, wherein the cam allows a spring to urge the locking pin in the first position, and a lock position, wherein the cam retains the locking pin in the second position;
wherein the feed assembly comprises at least a window located such that the cam is accessible through the at least one window, wherein the at least one window includes a transparent shield that covers the at least one window.