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Impact of Initial Wettability and Injection Brine Chemistry on Mechanical Behaviour of Kansas Chalk

  • Jaspreet S. SachdevaEmail author
  • Anders Nermoen
  • Reidar I. Korsnes
  • Merete V. Madland
Article
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Abstract

The injection of seawater-like brines alters stiffness, strength and time-dependent deformation rates for water-saturated chalks. This study deals with the mechanical effects and oil production upon brine injection through wettability-altered samples. The results from two test programs are presented: (a) ‘Wettability determination program’ and (b) ‘triaxial test program’. Kansas chalk samples were saturated by a mixture of oil and water and aged over time at 90 °C. The wettability index of the altered samples was estimated using chromatographic separation tests by co-injecting sulphate ions that adsorb on the water-wet mineral surfaces and non-affine tracer. A good repeatability was observed. In the triaxial test program, unaged water-wet and aged mixed-wet samples were hydrostatically loaded to 1.5 times yield stress so stiffness and strength could be determined. The samples were kept at the same stress level over time to monitor the volumetric creep. After a stagnant flow period of 15 days, MgCl2 brine and seawater were flushed through the samples so the oil production and ion concentration of the effluent water could be obtained. The combined observations of the bulk volume, oil volume and estimated solid volume (from effluent analyses) enabled us to calculate pore volume and thereby oil saturation with time. The mixed-wet samples were found to be stiffer and stronger than the water-wet samples, and when the stress was kept at 1.5 times yield the creep curves overlapped. During the flow-through period, the changes in ion composition are insensitive to the presence of oil, and ongoing water weakening for mixed-wet samples is the same as in the water-wet samples. Further, we found that oil was only produced during the first 2–3 pore volumes (PVs) injected. Afterwards, no oil was produced even though the chemical reactions took place and pore volume reduced.

Keywords

Improved oil recovery Water flooding Chalk compaction Wettability Geomechanics Oil production measurements 

Notes

Acknowledgements

The authors acknowledge the Research Council of Norway and the industry partners, ConocoPhillips Skandinavia AS, Aker BP ASA, Eni Norge AS, Equinor ASA, Neptune Energy Norge AS, Lundin Norway AS, Halliburton AS, Schlumberger Norge AS, Wintershall Norge AS, and DEA Norge AS, of The National IOR Centre of Norway for support.

Compliance with Ethical Standards

Availability of Data

The raw data that support the findings of this study are available as supplementary material.

Supplementary material

11242_2019_1269_MOESM1_ESM.xlsx (6.7 mb)
Supplementary material 1 (XLSX 6866 kb)

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© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.The National IOR Centre of NorwayUniversity of StavangerStavangerNorway
  2. 2.Department of Energy ResourcesUniversity of StavangerStavangerNorway
  3. 3.NORCE - Norwegian Research Centre ASOsloNorway

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