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Transport of polymer solutions in controlled low permeability porous media of various mineralogies

Abstract : Chemical Enhanced Oil Recovery (EOR) is considered as an attractive option for low permeability reservoirs, in particular where lack of gas supply does not allow gas injection processes. However, its application can be challenging for permeabilities below 100mD, as poor injectivity and high chemical retention are frequently observed in these cases. This work aimed at investigating the impact of both chemical and mineralogical parameters on the transport of polymer solutions in well-controlled low permeability porous media. For that, polymer injection tests were carried out using HPAM solutions of different ionic strengths and hardnesses and four granular sand-clay packs using quartz and three types of clays: kaolinite, illite and smectite. Results confirm the major role played by the injection water composition (salinity and hardness) on polymer conformation and on polymer-minerals interactions. Strong interactions between polymer and clay are evidenced with significant differences according to the clay type: good propagation and high polymer retention in an uncharged and non-swelling clay (kaolinite) and poor propagation with lower retention than expected in charged or swelling clays (illite, smectite). These outcomes stand as new elements for understanding the transport of polymer solutions in low permeability sandstone reservoirs.
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https://hal.univ-lorraine.fr/tel-02518314
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Imane Guetni. Transport of polymer solutions in controlled low permeability porous media of various mineralogies. Continental interfaces, environment. Université de Lorraine, 2019. English. ⟨NNT : 2019LORR0184⟩. ⟨tel-02518314⟩

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