Full-scale Surface Experiment of Cemented-in Casing Connections Designed for 
Thermal Stress Mitigation

Kaldal , Gunnar Skúlason; Thorbjornsson, Ingólfur; Guðmundsson, Lárus; Reinsch, Thomas; Lipus, Martin Peter; Wollenweber, Jens; Orlic, Bogdan; Gíslason, Þór; Stefánsson, Ari; Pálsson, Bjarni; Sverrisson, Ólafur

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Full-scale Surface Experiment of Cemented-in Casing Connections Designed for Thermal Stress Mitigation

Authors

Kaldal , Gunnar Skúlason
External Organizations;

Thorbjornsson, Ingólfur
External Organizations;

Guðmundsson, Lárus
External Organizations;

/persons/resource/reinsch

Reinsch, Thomas
4.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/mlipus

Lipus, Martin Peter
4.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Wollenweber, Jens
External Organizations;

Orlic, Bogdan
External Organizations;

Gíslason, Þór
External Organizations;

Stefánsson, Ari
External Organizations;

Pálsson, Bjarni
External Organizations;

Sverrisson, Ólafur
External Organizations;

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http://europeangeothermalcongress.eu/wp-content/uploads/2019/07/37.pdf
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Citation

Kaldal, G. S., Thorbjornsson, I., Guðmundsson, L., Reinsch, T., Lipus, M. P., Wollenweber, J., Orlic, B., Gíslason, Þ., Stefánsson, A., Pálsson, B., Sverrisson, Ó. (2019): Full-scale Surface Experiment of Cemented-in Casing Connections Designed for Thermal Stress Mitigation - Proceedings, European Geothermal Congress (The Hague, The Netherlands 2019).

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_4539904

Abstract

Common failure mechanisms in high-temperature geothermal wells are casing collapse and tensile joint rupture. For medium- to high-enthalpy geothermal wells, thermal cycling has the potential to severely deteriorate the integrity of the cemented annulus. Additionally, for higher enthalpy wells, yielding of casings becomes a structural concern. A recently innovated patented solution, flexible couplings, aim to reduce thermal strains by allowing displacement from thermally expanding casing segments at ~12 m intervals (API Range 3 casings). In the GeConnect project, a full-scale surface experiment composed of a 9⅝′′ casing equipped with a flexible coupling cemented into a 13⅜′′ casing is constructed and installed on a wellpad of an existing high-temperature geothermal well in Iceland. The aim is to investigate effects of thermal cycling on well integrity and to test the function of cemented-in flexible couplings. Along with testing the flexible coupling, cement sheath integrity and the cement-casing boundary behavior will be evaluated atmoderate to high temperatures. Structural models are used to analyze casing-cement interactions and to evaluate prospects and potential improvements of well integrity by using flexible couplings on experimental up to field scale.