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Near well-bore sealing in the Bečej CO2 reservoir: Field tests of a silicate based sealant

Abstract : A silica gel was applied in a porous gas reservoir, with the purpose of testing mitigation and remediation of CO2 leakage from geological storage reservoirs. The gel has a high strength and a very low water-like viscosity, that extends its applicability to small pore diameters and low permeability media. The gel was prepared and applied on-site with oilfield equipment. Mixing was upscaled from laboratory- to field-scale, including one unsuccessful attempt. Environmental concerns and additional health and safety requirements were modest as the formulation was composed only of the non-toxic commercial silica-based product Betol K28 T, acetic acid and fresh water. A well was selected and prepared in the Bečej natural CO2 field in Serbia, the well and reservoir were prepared and the gel was placed into a 600 m deep CO2- and CH4-bearing sandstone layer. The reservoir was selectively sealed to the gas cap through a fast, CO2-selective gelation, while the hydraulic pathways of the liquid-filled part of the reservoir remained open. In the regions where no CO2 was present the gelation reaction was slower and the kinetic was temperature-accelerated. A numerical model was used to simulate the impact of the pre-injection operational procedures and to quantify the impact on the temperature-dependent gelation time. The workflow aligns the needs of a research project with the interests and practical priorities of an operating company.
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https://hal-ifp.archives-ouvertes.fr/hal-02408068
Contributor : Nadine Couëdel <>
Submitted on : Thursday, December 12, 2019 - 5:46:49 PM
Last modification on : Thursday, December 3, 2020 - 9:24:12 AM

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Bernd Wiese, Marc Fleury, Ivan Basic, Jafar Abdollahi, Aleksandar Patrnogic, et al.. Near well-bore sealing in the Bečej CO2 reservoir: Field tests of a silicate based sealant. International Journal of Greenhouse Gas Control, Elsevier, 2019, 83, pp.156-165. ⟨10.1016/j.ijggc.2019.01.027⟩. ⟨hal-02408068⟩

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