EP 2396383 A1 20111221 - AQUEOUS DISPLACEMENT FLUID INJECTION FOR ENHANCING OIL RECOVERY FROM A LIMESTONE OR DOLOMITE FORMATION
Title (en)
AQUEOUS DISPLACEMENT FLUID INJECTION FOR ENHANCING OIL RECOVERY FROM A LIMESTONE OR DOLOMITE FORMATION
Title (de)
WÄSSRIGE VERDRÄNGUNGSFLÜSSIGKEIT ZUR INJIZIERUNG IM ZUGE DER VERSTÄRKTEN ÖLFÖRDERUNG AUS KALKSTEIN- ODER DOLOMITFORMATION
Title (fr)
INJECTION DE FLUIDE AQUEUX DE DÉPLACEMENT POUR AMÉLIORER LA RÉCUPÉRATION DE PÉTROLE À PARTIR D'UNE FORMATION CALCAIRE OU DE DOLOMITE
Publication
Application
Priority
- EP 2010051676 W 20100211
- EP 09152834 A 20090213
- EP 09163147 A 20090618
- EP 10703469 A 20100211
Abstract (en)
[origin: WO2010092095A1] A method for enhancing oil recovery (EOR) from a limestone or dolomite formation containing crude oil and connate water comprises: -determining a SO4 2- / Ca2+ ratio (Mol/Mol) in the connate water; and -injecting into the formation pore spaces an aqueous displacement fluid with a SO4 2- / Ca2+ molar ratio (Mol/Mol) above 1 and a higher SO4 2- / Ca2+ molar ratio (Mol/Mol) than the connate water. The method modifies the wettability of the limestone or dolomite formation such that its oil wettability is reduced and its water wettability is increased. Figure 17 shows that only brines LS2 and LS3 will be effective in wettability modification. In Table 5 it is shown that these brines have a SO4 2- / Ca2+ ratio (Mol/Mol) above 1 and a higher SO4 2- / Ca2+ ratio (Mol/Mol) than the connate water.
IPC 8 full level
C09K 8/58 (2006.01)
CPC (source: EP GB)
C09K 8/58 (2013.01 - EP GB)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
WO 2010092095 A1 20100819; CN 102356141 A 20120215; EP 2396383 A1 20111221; GB 201113561 D0 20110921; GB 2479110 A 20110928
DOCDB simple family (application)
EP 2010051676 W 20100211; CN 201080012339 A 20100211; EP 10703469 A 20100211; GB 201113561 A 20100211