An innovative method for the quantification of small amounts of crude oil in water using a multi-wavelength separation analyzer

Rendel, Pedro M.; Mohammadkhani, Samira; Jensen, Annette Eva; Feilberg, Karen L.

doi:10.1016/j.petrol.2021.108388

Cited by 2 publications

(1 citation statement)

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“…Effluents were collected in cuvettes readable by a multi-wavelength separation analyzer (LUMiReader ® , LUM TM GmbH, Germany) instrument in order to accurately measure the volumes of oil produced. This measurement technique allows for the detection of oil in the effluent with volumes in the 3-2500 µL range [50]. After saturating the core plugs with formation water, crude oil was injected into the core to establish initial water saturation (S wi ).…”

Section: Core Preparation and Water Floodingmentioning

confidence: 99%

Crude Oil–Brine–Rock Interactions in Tight Chalk Reservoirs: An Experimental Study

et al. 2021

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We present a systematic study of crude oil–brine–rock interactions in tight chalk cores at reservoir conditions. Flooding experiments are performed on outcrops (Stevns Klint) as well as on reservoir core plugs from Dan field, the Ekofisk and Tor formations. These studies are carried out in core plugs with reduced pore volumes, i.e., short core samples and aged with a dynamic ageing method. The method was evaluated by three different oil compositions. A series of synthetic multicomponent brines and designed fluid injection scenarios are investigated; injection flow rates are optimized to ensure that a capillary-dominant regime is maintained. Changes in brine compositions and fluid distribution in the core plugs are characterized using ion chromatography and X-ray computed tomography, respectively. First, we show that polar components in the oil phase play a major role in wettability alteration during ageing; this controls the oil production behavior. We also show that, compared to seawater, both formation water and ten-times-diluted seawater are better candidates for enhanced oil recovery in the Dan field. Finally, we show that the modified flow zone indicator, a measure of rock quality, is likely the main variable responsible for the higher oil recoveries observed in Tor core samples.

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Section: Core Preparation and Water Floodingmentioning

confidence: 99%