Effet de l’injection d’eau de production sur la perméabilité des réservoirs pétroliers non cimentés

Abstract : Hydraulic damage and plugging of the granular structure of oil reservoirs are commonly observed during the re-injection of produced water. These phenomena can lead to a significant decrease of the reservoir permeability around the injectors and affect the injectivity of these wells. The objective of this thesis is to study the transport and deposition process of solid particles in a sand reservoir and its influence on the permeability of the medium. We also study the influence of certain parameters such as particle concentration, injection flow rate, the size of injected particles, the pore size of the medium and the surface roughness of the grains. The aim of this work is to propose a predictive model of transport-deposition-damage in order to estimate the durability of the system. For this purpose, an experimental program was conducted on the transport and deposition process of the siliceous particles of size of a few microns in dense sand specimens. These tests were carried out on three different devices; two one-dimensional injection devices (injection column and injection cell) and a radial injection device in “chambre d'étalonnage” in order to simulate the injection wells conditions. In these tests, the flow conditions are controlled and the concentration of particles in the suspension is imposed. During injection, the monitoring of the evolution of pore pressure is carried out using pressure sensors located in different places in the medium. The particle concentration in the outgoing fluid is measured using a turbidimeter installed at the outlet. The experimental study carried out under different conditions allowed to highlight a highly heterogeneous particle deposition in the porous medium. This heterogeneity results in the formation of an internal and/or external cake in the vicinity of the injection point. The analysis of this cake shows a double porosity medium with two pore families corresponding to the internal porosity of the agglomerates formed by the deposited particles and porosity of the sand gradually reduced by the particles deposition. A parametric study permitted to show a distinction between the effect of low and high particles concentrations, as well as the importance of the effect of injection flow rate, the pore size, the particle size of the suspension and the roughness of the surface of the grains. This experimental work is associated with modelling of transport and deposition of particle in a porous medium. We used first the convection model in which a constitutive law describing the particle deposition takes into account the effects of the deposited particles concentration and the release of particles. The parameters of the particle deposition constitutive law as well as an empirical porosity-permeability law have been calibrated by simulation of the results of injection tests performed in the injection cell under different conditions. A semi-analytical model based on the Eylander (1988) model was developed in which we take into account a spatial distribution of the deposited particles and a double porosity of the medium (cake and granular medium). This distribution is inspired from the results if convection model studied before. The simulation of the results of injection experiments permitted to show the performances of this model for prediction of the pore pressure evolution during the fluid injection. This model allows prediction of the permeability evolution in a simpler and directly applicable manner in the reservoir engineering
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Sadok Feia. Effet de l’injection d’eau de production sur la perméabilité des réservoirs pétroliers non cimentés. Mécanique des matériaux [physics.class-ph]. Université Paris-Est, 2015. Français. ⟨NNT : 2015PEST1052⟩. ⟨tel-01214585⟩



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