Title
Near well-bore sealing in the Becej CO 2 reservoir: Field tests of a silicate based sealant
Author
Wiese, B.U.
Fleury, M.
Basic, I.
Abdollahi, J.
Patrnogic, A.
Hofstee, C.
Carlsen, I.M.
Wollenweber, J.
Schmidt-Hattenberger, C.
Drysdale, R.
Karas, D.
Publication year
2019
Abstract
A silica gel was applied in a porous gas reservoir, with the purpose of testing mitigation and remediation of CO 2 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 Becej natural CO 2 field in Serbia, the well and reservoir were prepared and the gel was placed into a 600 m deep CO 2 - and CH 4 -bearing sandstone layer. The reservoir was selectively sealed to the gas cap through a fast, CO 2 -selective gelation, while the hydraulic pathways of the liquid-filled part of the reservoir remained open. In the regions where no CO 2 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. A© 2019 Elsevier Ltd
Subject
Geological Survey Netherlands
Geosciences
2015 Energy
Sealant
Silica
CO2 leakage
Water-Cut
Reactive solution
Reservoir management
Remediation
To reference this document use:
http://resolver.tudelft.nl/uuid:e90ae65f-5c3f-49fc-96c3-e68211435de2
DOI
https://doi.org/10.1016/j.ijggc.2019.01.027/
TNO identifier
862566
ISSN
1750-5836
Source
International Journal of Greenhouse Gas Control, 83, 156-165
Document type
article