Gas injection test in the Callovo-Oxfordian claystone: data analysis and numerical modelling
| Autor: | Sylvie Granet, Pierre Gerard, Benjamin Helmlinger, Rémi de La Vaissière, Jean Talandier, Médéric Piedevache, Jean-Pol Radu, Frédéric Collin, Robert Charlier |
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| Rok vydání: | 2014 |
| Předmět: |
Flow (psychology)
0211 other engineering and technologies Borehole Rotational symmetry Experimental data Geology Ocean Engineering 02 engineering and technology Interval (mathematics) 010502 geochemistry & geophysics 01 natural sciences Pore water pressure Volume (thermodynamics) Injection test Geotechnical engineering 021101 geological & geomatics engineering 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Geological Society, London, Special Publications. 400:427-441 |
| ISSN: | 2041-4927 0305-8719 |
| DOI: | 10.1144/sp400.10 |
| Popis: | This paper describes a field-scale experiment on gas transport mechanisms performed at Andra's Underground Research Laboratory (URL) in a clay rock. The experimental layout consists of two parallel boreholes that are equipped with multiple packer completions isolating three intervals each, which have been continuously monitoring the pore pressure evolution of the clay rock. Nitrogen gas was injected in the middle test interval of one of the boreholes at increasing rates. The entire gas test comprised six periods of controlled gas injections, each followed by a shut-in pressure recovery phase. The experimental data are presented along with their interpretation by means of numerical modelling of two-phase flow of gas and water using different numerical codes and different geometrical approaches that include axisymmetric, half-space and full 3D models. An iterative modelling process was used to show step-by-step how an accurate description of each component of the experiment system produced a satisfactory reproduction of the experimental data and an improved understanding of the relevant phenomena. For instance, the initial volume of remaining water in the test interval, and the presence of a damaged zone around the boreholes, was important for the models to obtain good agreement with the field data. |
| Databáze: | OpenAIRE |
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