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Resolution of problems of corrosion and scaling in geothermal systems

Objective

The research program includes low- and high-enthalpy geothermal exploitation. Its objectives are:

- Understanding of the physical and chemical processes of corrosion and scaling in geothermal installations;
- Modelling of these phenomena;
- Definition of new methods for investigating and combating corrosion and scaling.

The project is divided between the participants in the two branches of high- and low-enthalpy.

For the low-enthalpy field the programme will include:

1) Analyzing the mechanism, under different conditions of exploitation, of corrosion and scaling with the formation of iron sulfide. This study requires: a) the development and use of a new and specific bottom-hole sampler; b) laboratory tests; c) new numerical models.

2) Analyzing the influence of sulphate-reducing bacteria producing H2S and also the procedures to combat them.

3) Studying and testing special anti-corrosive methods : a) organic inhibitors (including solid state); b) mineral inhibitors; c) sulfide oxidation.

For the high-enthalpy field the program will include:

1) Improving the understanding of two-phase flow geothermal systems;

2) Determining the significance of various factors that favour scaling;

3) Studying coagulation of colloidal sulphide and silica particles and the possibility of separating them;

4) Studying new methods for separating non-condensible gases from steam;

5) Studying the mechanisms of calcium-carbonate and iron-sulfide scaling and their relationships;

6) Examining the relationship between scaling and corrosion;

7) Studying the mechanisms and controls of chloride corrosion by : a) analysis of droplet condensation from wet steam in long pipes; b) laboratory studies of steam and gas cleansing.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Bureau de Recherches Géologiques et Minières (BRGM)
Address
39-43 Quai André Citroën
75739 Paris
France

Participants (9)

ASSOCIATION POUR LA RECHERCHE ET LE DEVELOPPEMENT DES METHODES ET PROCESSUS INDUSTRIELS
France
Address
Boulevard Saint-michel 60
75272 Paris
COMMISSARIAT A L'ENERGIE ATOMIQUE
France
Address
Rue De La Federation 31-33
75015 Paris
Centre Belge d'Etude de la Corrosion
Belgium
Address
Avenue P.héger
1050 Bruxelles
FOUNDATION OF RESEARCH AND TECHNOLOGY - HELLAS
Greece
Address
6Th Km, Charilaou - Thermi Road
57001 Thessaloniki
Foundation for Research and Technology-Hellas
Greece
Address
Stadiou 18, Platani
26500 Patras
INSTITUT DE RECHERCHES HYDROLOGIQUES
France
Address
Rue Gabriel Péri 11 Bis
54500 Vandoeuvre-les-nancy
INSTITUTO SUPERIOR TECNICO
Portugal
Address
1,Avenida Rovisco Pais 1
1049-001 Lisboa
National Energy Authority of Iceland
Iceland
Address
9,Grensasvegur
0108 Rejkjavik
Università degli Studi di Pisa
Italy
Address
Via Diotisalvi 2
56126 Pisa