The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2026
Filed:
May. 07, 2025
Chevron Oronite Company Llc, San Ramon, CA (US);
Chevron U.s.a. Inc., San Ramon, CA (US);
Farzan Parsinejad, Houston, TX (US);
Antonio Critsinelis, Kingwood, TX (US);
William R. Ruhe, Jr., Benicia, CA (US);
Man Kit Ng, El Sobrante, CA (US);
Chevron U.S.A. Inc., San Ramon, CA (US);
Chevron Oronite Company LLC, San Ramon, CA (US);
Abstract
Disclosed are methods and apparatus for preventing corrosion within the annulus of a flexible pipe used in a riser in an offshore hydrocarbon production facility. Buffer fluid comprising a passivating agent is introduced into the annulus to form protective layers on metal surfaces within the annulus to resist corrosive materials from contacting the metal surfaces. The passivating agents may be one or more of a polyalphaolefin, a polybutene, or a polysiloxane. A corrosion inhibitor may be combined with the passivating agent in the buffer fluid. Pretreating of the metal surfaces within the annulus prior to introduction of the buffer fluid can be performed with a pretreating corrosion inhibitor.