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1. (WO2016053354) PRESSURE COMPENSATION MECHANISM FOR A SEAL ASSEMBLY OF A ROTARY DRILLING DEVICE

Pub. No.:    WO/2016/053354    International Application No.:    PCT/US2014/059088
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Sat Oct 04 01:59:59 CEST 2014
IPC: E21B 17/00
F16J 15/16
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: HAGAR, Everett P.
Title: PRESSURE COMPENSATION MECHANISM FOR A SEAL ASSEMBLY OF A ROTARY DRILLING DEVICE
Abstract:
A downhole rotary seal assembly is provided that includes a primary rotary seal, a barrier seal, and a seal carrier. The seal carrier includes an inner surface, an outer surface, and a first groove dimensioned to receive the primary rotary seal at the inner surface. The seal carrier also includes a second groove dimensioned to receive the barrier seal at the inner surface. An aperture is defined on the inner surface between the first groove and the second groove. A relief port is positioned between the first groove and the second groove, the relief port being positioned to fluidly couple the aperture and the outer surface. A valve provided in the relief port. The valve includes a check valve having a predefined crack pressure.