Objective
TO IMPROVE KNOWLEDGE OF DEEP IN-SITU ROCK STRESSES IN FRANCE.
During the last 2 years, the Bureau de Recherches Geologiques et Minieres (BRGM) has developed a hydraulic fracturing unit and carried out in situ stress measurements using this unit which comprises a wireline operated straddle packer system. Technological developments performed by BRGM on the equipment were aimed at improving its reliability and its precision. The stress measurement campaigns were reviewed with particular emphisis on the use of interpretation methods. 2 theoretical works were presented. The first incorporated anistrophy of the rock in the interpretation and in the second a special fracture element capable of reproducing hydromechanical coupling has been developed for incorporation in a finite element code. This should allow the test interpretation to consider the whole pressure response curve, instead of a few characteristic points.
The main difficulty encountered in the programme has been the inability to find boreholes corresponding to the ideal technical specifications for the method. This is due mainly to the slowing down of mining exploration in France and experimentation was forced to take place in boreholes with too small a diameter, in heterogeneous media, with large topographic effects. This explains why the interpretation of the test results was never straightforward. Finally, the theoretical work contributes to the development of interpretation methods. An analytical tool has already been developed and tested against laboratory results for the extension of fast flow rate reopening pressures interpretation to any geometry. Another numerical tool for the modelling of fracture reopening under pressure simulates this phenomenon realistically.
THE CONTRACTOR WILL CARRY OUT AND INTERPRET HYDROFRACTURE STRESS MEASUREMENT IN BOREHOLES DRILLED IN FRANCE BY OTHERS FOR MINING OR SCIENTIFIC PURPOSES. EXPERIMENTS ARE ENVISAGED AT 3 OR 4 SITES EACH YEAR.
THE CONTRACTOR WILL ACQUIRE AND MODIFY ONE OF THE LOGGING WINCHES DEVELOPED AT BOCHUM UNIVERSITY (SEE ALSO CONTRACT NO.G0055D).
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- social sciences political sciences public administration bureaucracy
- natural sciences mathematics pure mathematics geometry
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Coordinator
75739 Paris
France
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