Conditions for a Low-Salinity Enhanced Oil Recovery (EOR) Effect in Carbonate Oil Reservoirs

Autor:	K. J. Webb, Tor Austad, Skule Strand, S. F. Shariatpanahi, C. J. J. Black
Rok vydání:	2011
Předmět:	Anhydrite Oil in place General Chemical Engineering Steam injection Energy Engineering and Power Technology Mineralogy chemistry.chemical_compound Fuel Technology chemistry Distilled water Carbonate Environmental science Seawater Enhanced oil recovery Clay minerals
Zdroj:	Energy & Fuels. 26:569-575
ISSN:	1520-5029 0887-0624
DOI:	10.1021/ef201435g
Popis:	Low-salinity enhanced oil recovery (EOR) effects have for a long time been associated with sandstone reservoirs containing clay minerals. Recently, a laboratory study showing low-salinity EOR effects from composite carbonate core material was reported. In the present paper, the results of oil recovery by low-salinity water flooding from core material sampled from the aqueous zone of a limestone reservoir are reported. Tertiary low-salinity effects, 2–5% of original oil in place (OOIP), were observed by first flooding the cores with high-saline formation water (208 940 ppm) and then with 100× diluted formation water or 10× diluted Gulf seawater at 110 °C. It was verified by flooding the core material with distilled water that the core samples contained small amounts of anhydrite, CaSO4(s). The oil recovery was tested under forced displacement using different injection brines and oils with different acid numbers, 0.08, 0.34, and 0.70 mg of KOH/g. The low-salinity effect depended upon mixed wet conditions, a...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5a08aec1e011b8f3085f6fcfccacc938 https://doi.org/10.1021/ef201435g Zobrazit plný text záznamu