EP 3630915 A1 20200408 - METHOD FOR EXTRACTING PETROLEUM FROM UNDERGROUND DEPOSITS HAVING HIGH TEMPERATURE AND SALINITY
Title (en)
METHOD FOR EXTRACTING PETROLEUM FROM UNDERGROUND DEPOSITS HAVING HIGH TEMPERATURE AND SALINITY
Title (de)
VERFAHREN ZUR ERDÖLFÖRDERUNG UNTERIRDISCHER VORKOMMEN MIT HOHER TEMPERATUR UND SALINITÄT
Title (fr)
PROCÉDÉ À HAUTE TEMPÉRATURE ET À HAUTE SALINITÉ POUR L'EXPLOITATION PÉTROLIÈRE DE GISEMENTS SOUTERRAINS
Publication
Application
Priority
- EP 17173486 A 20170530
- EP 2018062786 W 20180516
Abstract (en)
[origin: WO2018219654A1] The invention relates to a method for extracting petroleum from underground oil reservoirs, wherein an aqueous, salt-containing surfactant formulation comprising a surfactant mixture for lowering the interfacial tension between oil and water to < 0.1 mN/m is pressed into an oil reservoir through at least one injection well and crude oil is removed from the reservoir through at least one production well, wherein the oil reservoir has a temperature of ≥ 90°C and a formation water having a salinity of ≥ 30000 ppm of dissolved salts and wherein the surfactant mixture contains at least one ionic surfactant (A) of general formula (I): (R1)k-N+(R2)(3-k)R3 (X-)l and at least one anionic surfactant (B) of general formula (II): R4-O-(CH2C(R5)HO)m-(CH2C(CH3)HO)n-(CH2CH2O)o-(CH2)p-Y-M+, wherein, during injection, there is a molar ratio of ionic surfactant (A) to anionic surfactant (B) of 90 : 10 to 10 : 90 in the surfactant mixture and wherein R1 to R5, k, l, m, n, o, p, X, Y and M have the meaning indicated in the claims and in the description. The invention further relates to a concentrate containing surfactant (A), surfactant (B), or the surfactant mixture.
IPC 8 full level
C09K 8/584 (2006.01); C11D 1/06 (2006.01); C11D 1/62 (2006.01); C11D 1/65 (2006.01); C11D 1/74 (2006.01); C11D 1/90 (2006.01)
CPC (source: EP US)
C09K 8/584 (2013.01 - EP); C09K 8/602 (2013.01 - US); C09K 8/86 (2013.01 - US); E21B 43/16 (2013.01 - US)
Citation (search report)
See references of WO 2018219654A1
Designated contracting state (EPC)
AL 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 RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2018219654 A1 20181206; CA 3064487 A1 20181206; CN 111566183 A 20200821; EP 3630915 A1 20200408; MX 2019014431 A 20200817; RU 2019137467 A 20210701; US 2020239762 A1 20200730
DOCDB simple family (application)
EP 2018062786 W 20180516; CA 3064487 A 20180516; CN 201880047700 A 20180516; EP 18723545 A 20180516; MX 2019014431 A 20180516; RU 2019137467 A 20180516; US 201816617575 A 20180516