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Synthèse et étude de copolymères hydrosolubles, associatifs et échangeables pour la récupération assistée du pétrole

Abstract : One of the solutions for enhanced oil recovery is the use of aqueous formulations of polymers in order to improve the rheological properties of the extracting fluid and allow a better sweeping in the oil well. Because the polymers currently used do not allow for an efficient oil recovery, a new system was designed and studied with the aim to develop additives that could better withstand the very high shear rates induced by the injection. This system is based on the use of complementary polymers that can reversibly associate and exchange through imine chemistry. First, a thermodynamic study of the amine-aldehyde association allowed quantifying the influence of different parameters on the latter. Then, the rheological study of polymers alone in solution and of formulations of complementary polymers has shown the efficiency of the association trough a large increase in viscosity of the solutions, as well as by the formation of gels at low polymer concentration. The study of the influence of structural parameters has shown that the rheological properties of the formulation can be adjusted by playing on the polymer composition and functionality. The influence of parameters of interest for the application, such as pH, temperature and ionic strength, has also been studied. Finally, industrial tests have been performed with the polymers developed during this thesis, providing a comprehensive study of the system, from the synthesis of the monomers to application oriented tests.
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Julien Crozzolo. Synthèse et étude de copolymères hydrosolubles, associatifs et échangeables pour la récupération assistée du pétrole. Polymères. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLS002⟩. ⟨tel-03547910⟩

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