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Dissolution des roches carbonatées par injection d'acide

Abstract : Many acidizing treatments in carbonate reservoirs do not produce expected increase of productivity, especially in the case of open-hole horizontal wells. This is due to the poor modelling of near well-bore mechanisms. The unstable dissolution of the porous medium leads to the formation of highly conductive channels called wormholes, which are difficult to model quantitatively. A Darcy-scale dissolution model is proposed involving a Darcy-Brinkman equation for the flow part coupled with a local non-equilibrium dissolution model. A 3D numerical simulator has been developed to solve for the resulting PDEs using an operator splitting technique and high resolution TVD schemes. Results are shown for 2D and 3D configurations for both homogeneous and heterogeneous systems. The qualitative and quantitative features of the numerical results are discussed with respect to the published literature and compared to the experimental results. Experiments consist in injecting under-saturated salt water into a quasi 2D porous medium made of a thin layer af salt grains. Dissolution instability, channel development and wormhole propagation are recorded by making use of a video camera. Based on the 2D results, a first attempt is made at deriving a core-scale dissolution model based on cross-sectional averages. Several possibilities are explored including one-equation models, i.e., the core-scale medium incorporates the wormholes and the remaining porous matrix, and two-equation for which the wormholes are treated separately. Theoretical implications are discussed based on numerical experiments
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Contributor : Fabrice Golfier Connect in order to contact the contributor
Submitted on : Thursday, October 20, 2011 - 11:56:30 AM
Last modification on : Tuesday, November 9, 2021 - 4:52:05 PM
Long-term archiving on: : Thursday, November 15, 2012 - 10:06:02 AM

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  • HAL Id : tel-00634112, version 1

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Fabrice Golfier. Dissolution des roches carbonatées par injection d'acide. Energie électrique. Institut National Polytechnique de Toulouse - INPT, 2001. Français. ⟨NNT : 2001INPT037H⟩. ⟨tel-00634112⟩

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