Cathodic protection of offshore well casing

Journal Article · Tue Mar 01 04:00:00 EST 1988 · Mater. Performance; (United States)

OSTI ID:7002109

Hamberg, A; Orton, M D; Smith, S N

Few references are made on the extent of protection of the well casings attached to offshore platforms. F.W. Schremp reported tests in the Arabian Gulf that showed that the galvanic anodes protected the wells to a depth of --3200 ft (976 m) and that 300 A were required to completely protect bare well casings attached to a six-well platform in 40 ft (12 m) of water. Recent tests in deeper water (170 ft (52 m)) showed that the structure galvanic anodes deliver --8 A per well and protect the bare casing to --3000 ft (915 m). An impressed current cathodic protection system with 600 A applied to anodes placed 400 ft (122 m) from the structure protected the structure and six bare well casings to 8000 ft (2440 m). A protection criterion of 0.1 mA/ft/sup 2/ (1.1 mA/m/sup 2/) in the lower cemented zone was proposed. Impressed current anode placed closer than 400 ft (122 m) from the structure did not protect the wells to the required depth.

• Research Organization: Chevron Oil Field Research Co., P.O. Box 446, La Habra, CA (US)
• OSTI ID: 7002109
• Journal Information: Mater. Performance; (United States), Journal Name: Mater. Performance; (United States) Vol. 27:3; ISSN MTPFB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
423000* -- Engineering-- Marine Engineering-- (1980-)
BUILDING MATERIALS
CATHODIC PROTECTION
CEMENTS
CORROSION PROTECTION
MATERIALS
OFFSHORE OPERATIONS
OFFSHORE PLATFORMS
TECHNOLOGY ASSESSMENT
WELL CASINGS