Decoding the water flooding processes from produced water composition - A case study from the Halfdan chalk oil field, Danish north sea

N. H. Schovsbo, H. Holmslykke, C. Kjøller, L. Kristensen, K. H. Esbensen, A. Y. Halim, S. N. Gottfredsen, K. L. Feiberg, S. M. Nielsen

Publikation: Bidrag til bog/rapport/konferenceproceedingsKonferenceartikel i proceedingspeer review

2 Citationer (Scopus)

Abstrakt

Analysis of produced water is one of few direct sources of information to the subsurface processes active in an oil field. However, revealed geochemical patterns are typical complex and require a multidisciplinary approach to successfully unlock and decode. The Halfdan field initially contained two main types of formation brine but now, after 15 years of extensive water flooding, the field contains mostly a seawater modified type. The initial water was a low salinity sulphate-depleted type and a medium high saline sulphate-rich type that varied in a geographically systematic manner. The water treatment resulted in a net deposition of sulfate and Mg and a net export of Ca and Cl ions from the field. This pattern is similar to core flooding results, suggesting that a substantial alteration of the wettability of the chalk occurred. Spatial and temporal variation in water composition are mapped based on 3880 analysis from 75 wells and are related to water flooding history and sweep efficiencies obtained from 4D seismic. Produced water analysis is thus an important asset for designing water sweep in mature fields. Furthermore knowledge about the initial water types may optimize water treatment and prediction of geographically distribution scale and corrosion risks.

OriginalsprogEngelsk
Titel79th EAGE Conference and Exhibition 2017
ForlagEuropean Association of Geoscientists and Engineers, EAGE
ISBN (Elektronisk)9789462822177
DOI
StatusUdgivet - 2017
Begivenhed79th EAGE Conference and Exhibition 2017: Energy, Technology, Sustainability - Time to Open a New Chapter - Paris, Frankrig
Varighed: 12 jun. 201715 jun. 2017

Publikationsserier

Navn79th EAGE Conference and Exhibition 2017

Konference

Konference79th EAGE Conference and Exhibition 2017: Energy, Technology, Sustainability - Time to Open a New Chapter
Land/OmrådeFrankrig
ByParis
Periode12/06/1715/06/17

Emneord

  • Geothermal energy

Programområde

  • Programområde 3: Energiressourcer

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