Acid Well Utilisation Study: Well MG-9D, Philippines
- Key words
- carbon steel, acid, geothermal, well, corrosion, control, pH, scaling, corrosion product
- Location
- Mahanagdong, Philippines; Leyte
- Conference
- World Geothermal Congress
- Year
- 2010
- Session
- 27. Corrosion and Scaling
- Language
- English
- Paper number
- 2742
Full text
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Abstract
Acid wells have been found in many shallow geothermal reserves, but production from acidic geothermal wells is not yet common. The ability to safely and cost effectively produce such wells depends on the well chemistry and the selected corrosion control method.
An acid well, MG-9D was produced for a short period of testing with and without NaOH injection just below the wellhead to demonstrate the mechanism of corrosion control using corrosion coupons and on-line monitoring probes.
Carbon steels exposed to the unaltered acid well process steam corroded at rapid unacceptable rates whereas pH adjusted fluid had immediate reduction in corrosion rate. This paper will demonstrate the mechanisms of corrosion control - a mix of corrosion product formation and scaling.
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