| Title | IEA Deep Geothermal Resources Subtask C: Materials, Progress with a Database for Materials Performance in Deep and Acidic Geothermal Wells |
|---|---|
| Authors | Norio Sanada, Yoshiaki Kurata, Hiroshi Nanjo, Hyun-soo Kim, Jun Ikeuchi and Keith A Lichti |
| Year | 2000 |
| Conference | World Geothermal Congress |
| Keywords | IEA, deep geothermal Resources, acid fluids, corrosion control, materials selection, guidelines |
| Abstract | The IEA Deep Geothermal Initiative, Subtask C on materials has been progressed by surveys of deep geothermal well experience and research results. This work revealed that the chemistry of deep geothermal fluids is expected to be more acidic than is encountered in conventional shallow reserves. Emphasis of collaborative research under Subtask C has been on volcanic environments which reflect the anticipated deep fluid chemistry and on a limited number of shallow wells which encounter and produce acidic fluids. The IEA sponsored meetings have facilitated additional sharing of results from previous acid fluid research and development activities. Corrosion results and an understanding of corrosion mechanisms for volcanic and acidic well fluids provide a materials performance database for the anticipated deep well fluids. This growing materials database is being integrated with the results of thermodynamic modeling of the corrosion chemistry in acidic wells to develop predictive materials performance models. This paper reviews the current status of the database of corrosion results and predictive corrosion models. The database of evaluated and interpreted results has provided guidelines for materials selection and corrosion control options for aggressive deep and acidic well fluids. |