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1. (WO2018005740) WICKERS WITH TRAPPED FLUID RECESSES FOR WELLHEAD ASSEMBLY

Pub. No.:    WO/2018/005740    International Application No.:    PCT/US2017/039902
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Fri Jun 30 01:59:59 CEST 2017
IPC: E21B 33/04
F16L 15/00
Applicants: VETCO GRAY INC.
Inventors: FORD, David, L.
BORNIA, Guaraci
LOPES, Hugo
SILVA, Ricardo
Title: WICKERS WITH TRAPPED FLUID RECESSES FOR WELLHEAD ASSEMBLY
Abstract:
A wellhead assembly includes a wellhead housing having a bore with a wellhead housing sidewall and a longitudinal axis. A hanger lands in the bore, the hanger having a hanger sidewall. Parallel circumferentially extending hanger sidewall ridges are located on the hanger sidewall. Each of the hanger sidewall ridges have upper and lower flanks that converge to a crest. Hanger sidewall bands are located between adjacent ones of the hanger sidewall ridges. A metal seal ring has an outer seal surface in metal -to-metal sealing engagement with the wellhead housing sidewall and an inner seal surface in metal -to-metal sealing engagement with the hanger sidewall bands. Crests of the hanger sidewall ridges embed into the inner seal surface to restrict relative movement between the hanger and the seal ring. A recess extends through each of the hanger sidewall ridges from the upper flank to the lower flank to allow any fluid trapped between the hanger sidewall ridges to flow out.