Skip to Main content Skip to Navigation
Theses

Modélisation de l'écoulement de deux fluides non miscibles dans des milieux fracturés; application à l'injection d'eau à grande profondeur et à la recherche d'eau douce en milieu côtier.

Abstract : A European research program on Hot Dry Rock energy began in 1987 in Soultz-sous-forêts, France. Three wells have been drilled and reach the granite basement at a depth of 5km. A geothermal loop, constituted of a reinjection well and two production wells is created, and heat exploitation can lead to an important power production, thanks to a heat exchanger. Our works are focused on interpretation more than prediction, with a numerical tool integrating a strong hydromechanical coupling. Our purpose is to explain recorded datas by simulating the reservoir development and the fluid circulations induced by injections .The reservoir development is released by hydraulique stimulation, which consists in performing high rate injections, leading to the shear of the fractures. In order to interpret the observed phenomenas, the knowledge of the pressure distribution in the reservoir is necessary. Unfortunately, the density contrast between injected cold fresh water and the formation fluid (a 200°C heavy brine), leads to complex observations that could be treated by considering the two fluids as immiscible fluids. The numerical code FRACAS, programmed at the Centre of Geological Informatics of the Paris School of Mines, taking advantage of a Discrete Fracture Network formulation has already been used to predict the hydromechanical behaviour of the system. It was consequently decided to enhance this code in order to allow the simulation of multiphase flows of fluids of different physical and thermodynamical properties and to use it to underline eventual density driven flows. After a review of the different modelling techniques of fluid flows in fractured media, we will expose formulation and numerical resolution of multiphase flows in discrete fracture networks. Accuracy of the algoriths will be evaluated in two test cases (the Buckeley-Leverett test case and the problem of the coastal aquifer). The set-up of the geometrical model of the fracture network of Soultz-sous-forêts, based on field observations, will be precisely described in order to quantify the influence of the injected fluid density on hydraulic stimulation, and manage to predict the hydraulic behaviour of the global system during circulation tests.
Document type :
Theses
Complete list of metadatas

https://pastel.archives-ouvertes.fr/pastel-00001620
Contributor : Ecole Mines Paristech <>
Submitted on : Wednesday, May 17, 2006 - 8:00:00 AM
Last modification on : Tuesday, September 29, 2015 - 10:32:45 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:02:59 PM

Identifiers

  • HAL Id : pastel-00001620, version 1

Collections

Citation

Clément Baujard. Modélisation de l'écoulement de deux fluides non miscibles dans des milieux fracturés; application à l'injection d'eau à grande profondeur et à la recherche d'eau douce en milieu côtier.. Sciences of the Universe [physics]. École Nationale Supérieure des Mines de Paris, 2005. English. ⟨pastel-00001620⟩

Share

Metrics

Record views

639

Files downloads

350