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

Abstract

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:
Research Org.:
Ministry of Works and Development, Wairakei, New Zealand
Sponsoring Org.:
USDOE
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
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

Citation Formats

Bixley, P.F., and Wilson, D.M. RAPID CASING CORROSION IN HIGH TEMPERATURE LIQUID DOMINATED GEOTHERMAL FIELDS. United States: N. p., 1985. Web.
Bixley, P.F., & Wilson, D.M. RAPID CASING CORROSION IN HIGH TEMPERATURE LIQUID DOMINATED GEOTHERMAL FIELDS. United States.
Bixley, P.F., and Wilson, D.M. Tue . "RAPID CASING CORROSION IN HIGH TEMPERATURE LIQUID DOMINATED GEOTHERMAL FIELDS". United States. doi:. https://www.osti.gov/servlets/purl/892401.
@article{osti_892401,
title = {RAPID CASING CORROSION IN HIGH TEMPERATURE LIQUID DOMINATED GEOTHERMAL FIELDS},
author = {Bixley, P.F. and Wilson, D.M.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 22 00:00:00 EST 1985},
month = {Tue Jan 22 00:00:00 EST 1985}
}

Conference:
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  • Exploitation of the Wairakei and Broadlands (Ohaaki) geothermal fields has led to moderate to severe, but localized, environmental effects: decline and death of natural thermal features, ground movements (both horizontal and vertical), groundwater depletion, surface temperature and heat flow changes. These effects have been caused primarily by decreases in reservoir pressures of up to 25 bar associated with mass withdrawal and net mass loss. Small, but now clearly identifiable, precursors for some of these effects were observed during pre-production testing but their significance was not recognized at that time. If confidence in the geothermal industry by public, regulatory, and financialmore » sectors is to be maintained, then effective countermeasures for these and other environmental effects need to be investigated.« less
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  • An experimental apparatus has been constructed to simulate rapid thermal-cycling conditions in coal-gasification environments, as experienced by metal components of a ceramic gas-filtration system. A comparative study of the corrosion resistances of several commercial iron-nickel-chromium-base alloys in a equilibrated argon-14.1%H{sub 2}-11.1%H{sub 2}O-O.1%H{sub 2}S-O.08%HCl gas at 600 C has been undertaken. Tests were carried out under isothermal, conventional thermal-cycling and very rapid thermal-cycling conditions (1 min cooling, giving temperature decreases of 160 to 280 C, repeated every 6 min). Degradation of the alloys involved the development of oxide scales in the early stages, followed by breakdown and growth of sulfide-rich scales.more » Thermal cycling involving conventional cool-to-room-temperature cycles generally resulted in increases in the rates of degradation of the alloys, probably by facilitating failure of the transient scales and enhancing the rates of transport across the steady-state scales. However, rapid thermal cycling often resulted in reduced metal loss and thinner scales than isothermal exposure, possibly due to debonding in the scale or at the scale/alloy interface, thereby reducing the rate of cation transport across the scale.« less
  • Corrosion of well and surface equipment due to the presence of hot, corrosive brines is one of the major problems facing geothermal operators. For wellbore casing, this problem is complicated by the fact that in-place inspection is difficult at best. In an attempt to improve this situation, a prototype acoustic borehole televiewer designed to operate in geothermal wells was used to study the corrosion damage to casing in three commercial wells. The results of this experiment were promising. The televiewer returns helped to define areas of major corrosion damage and to indicate the extent of the damage. This paper brieflymore » discusses the corrosion problem, describes the acoustic borehole televiewer, and then summarizes the results of the field test of the televiewer's capability for investigating corrosion.« less