US 12,391,865 B2
Method for controlling the migration of formation fines
Alain Zaitoun, Rueil Malmaison (FR); Nazanin Salehi, Rueil Malmaison (FR); Jérôme Bouillot, Rueil Malmaison (FR); Arnaud Templier, Rueil Malmaison (FR); and Nicolas Gaillard, Rueil Malmaison (FR)
Assigned to POWELTEC, Rueil Malmaison (FR)
Appl. No. 18/021,744
Filed by POWELTEC, Rueil Malmaison (FR)
PCT Filed Aug. 11, 2021, PCT No. PCT/EP2021/072335
§ 371(c)(1), (2) Date Feb. 16, 2023,
PCT Pub. No. WO2022/043055, PCT Pub. Date Mar. 3, 2022.
Claims priority of provisional application 63/083,329, filed on Sep. 25, 2020.
Claims priority of application No. 2008830 (FR), filed on Aug. 31, 2020.
Prior Publication US 2023/0323190 A1, Oct. 12, 2023
Int. Cl. C09K 8/575 (2006.01); C08F 220/56 (2006.01); E21B 33/138 (2006.01)
CPC C09K 8/5753 (2013.01) [C08F 220/56 (2013.01); E21B 33/138 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for averting and/or delaying and/or limiting and/or preventing the migration of fines in a geological formation, said method comprising bringing the formation into contact with one or more copolymers comprising:
at most 40 mol % of monomeric units derived from one or more cationic monomers of formula (Ia) and/or (Ib)
CH2═C(R4)—C(═O)—Y—(CH2)m—W(R1)(R2)(R3), X−  (Ia)
[CH2═CH—CH2]n—N+(R1)(R2)(R3)(2−n), X−  (Ib)
in which
R4 represents a hydrogen atom or a methyl radical,
R1, R2 and R3, which may be identical or different, represent an ethyl radical or a methyl radical,
m represents an integer between 1 and 4,
n represents 1 or 2,
Y represents O, and
X− represents an anion chosen from bromide or chloride ions,
at least 60 mol % of monomeric units derived from one or more neutral monomers of formula (II)
CH2═C(R5)—C(═O)—N(R6)(R7)  (II)
in which
R5 represents a hydrogen atom or a methyl radical,
R6 and R7 represent, independently of one another, a hydrogen atom or an alkyl radical comprising from 1 to 4 carbon atoms, which is optionally substituted with a hydroxyl group,
wherein the sum of the repeating units derived from the cationic monomer of formula (Ia) and/or (Ib) and the repeating units derived from the neutral monomer of formula (II) represents at least 95 mol % of the total sum of the repeating units of the copolymer, and the copolymer does not comprise organosilane units,
wherein the copolymer has an average molar mass ranging from 3×106 g·mol−1 to 12×106 g·mol−1, and
wherein the method does not comprise injecting acidic compounds into the geological formation.