Electrohydraulic Fracturing of Rocks by Christian La Borderie, Thierry Reess, Wen Chen, Olivier

By Christian La Borderie, Thierry Reess, Wen Chen, Olivier Maurel, Franck Rey-Berbeder, Antoine de Ferron, Gilles Pijaudier-Cabot

This publication provides a brand new fracturing strategy that are meant to be regarded as a possible substitute, or a significant other procedure, to hydraulic fracturing of tight fuel reservoirs and occasional permeability rock plenty. in place of hydraulic fracturing which generates a number of numbers of enormous cracks, electro-hydraulic fracturing induces diffuse micro-cracking and fragmentation of rocks. Laboratory checks show that raises of permeability by means of orders of significance will be reached, with out significant cracking in verified specimens. This publication discusses the rules of this new procedure, stories experiments that have been built is order to end up the idea that and at last describes the numerical version from which the possibilities of this system in consultant reservoir stipulations might be assessed.

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Extra resources for Electrohydraulic Fracturing of Rocks

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The results obtained with the above constitutive relations will, however, be consistent with respect to two criteria: the rate effect on material strength observed from experiments and the fracture energy measured in statics (for sufficiently small strain rates). The agreement with both considerations could not be reached without a combination of rate-dependent effect on the constitutive response and the crack band model (or any other non-local/gradient formulation which introduces an internal length).

02 mm. 02 mm can be observed only. 5 kg/dm3. 8. 10. 02 mm. 9 shows the 14 Electrohydraulic Fracturing of Rocks effect of the level of electrical energy injected in the case of high confinement. Quantitatively, the crack surface area generated may be used to analyze the effectiveness of the process. 9 had fracture surfaces of 63 cm2, 439 cm2 and 351 cm2, respectively. This evolution correlates quite well with the specimens’ evolution of permeability. Nevertheless, without a complete statistical analysis, which was not performed in the present study in view of the limited number of tests for each energy and confinement configuration, no robust quantitative correlation can be determined.

Following classical approaches used in viscoplasticity, the rate-dependent damage model starts from the same equations as the rate-independent one, except for the damage multiplier. 18] εI in which the rate of damage and the damage multiplier replace their incremental values. 19] The material parameters M and n are used to control the rate-dependant effect on damage growth. 10. 10 shows the monotonic stress−strain curves for concrete in tension at different loading rates. 4. The higher the rate, the higher the strength.

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