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Title: RAPID CASING CORROSION IN HIGH TEMPERATURE LIQUID DOMINATED GEOTHERMAL FIELDS

Downhole logging and workover operations on 12-20 year old wells in several high temperature, liquid-dominated geothermal fields in New Zealand has shown that severe corrosion has commonly occurred in the production casing string where this is unprotected by larger diameter casings. To date corrosion products from only one well have been examined in detail. These indicate that corrosion attack commences at the outer casing wall and continues at a rate as great as 0.8mm/year. Rapid corrosion has been attributed to neutral or slightly acid high bicarbonate waters formed by the absorption of steam and gas into shallow aquifers not directly connected to the deeper, high chloride reservoir.
Authors:
;
Publication Date:
OSTI Identifier:
892401
Report Number(s):
SGP-TR-84; CONF-850107-32
TRN: US200623%%63
Resource Type:
Conference
Resource Relation:
Conference: 10. annual workshop on geothermal reservoir engineering, Stanford, CA (US), 01/22/1985
Research Org:
Ministry of Works and Development, Wairakei, New Zealand
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 15 GEOTHERMAL ENERGY; ABSORPTION; ACID CARBONATES; AQUIFERS; CHLORIDES; CORROSION; CORROSION PRODUCTS; GEOTHERMAL FIELDS; NEW ZEALAND; PRODUCTION; RESERVOIR ENGINEERING; STEAM; Geothermal Legacy