公开(公告)号：US10181706B2

公开(公告)日：2019-01-15

申请号：US15473268

申请日：2017-03-29

Applicant: Chevron U.S.A. Inc.

Inventor： Ian Paul Kemp ,  David Glynn Thomas ,  Ursula Louise Benson

IPC: H02G1/08 ,  H02G1/10 ,  E21B29/02 ,  F16L1/16

Abstract: Disclosed are processes for removing carbon steel components of a subsea oilfield facility in a subsea environment by accelerating the corrosion of the carbon steel components in the surrounding seawater, by a passive and/or active impressed current method. In the passive method, the facility is connected to a cathodic metal of greater electrical potential, such as copper. In order to cause the maximum and uniform corrosion, it is preferred that a wire of the chosen cathodic metal be extended along the facility and through pipelines. In the active impressed current method, an external DC electrical supply is used to apply an electrical potential difference between the steel components of the facility and the cathodic metal.

公开(公告)号：US20170264086A1

公开(公告)日：2017-09-14

申请号：US15473268

申请日：2017-03-29

Applicant: Chevron U.S.A. Inc.

Inventor： Ian Paul Kemp ,  David Glynn Thomas ,  Ursula Louise Benson

IPC: H02G1/08 ,  H02G1/10

CPC classification number: H02G1/08 ,  B09B3/00 ,  F16L1/16 ,  H02G1/10

Abstract: Disclosed are processes for removing carbon steel components of a subsea oilfield facility in a subsea environment by accelerating the corrosion of the carbon steel components in the surrounding seawater, by a passive and/or active impressed current method. In the passive method, the facility is connected to a cathodic metal of greater electrical potential, such as copper. In order to cause the maximum and uniform corrosion, it is preferred that a wire of the chosen cathodic metal be extended along the facility and through pipelines. In the active impressed current method, an external DC electrical supply is used to apply an electrical potential difference between the steel components of the facility and the cathodic metal.