US 12,091,608 B2
Composition for enhancing injectivity of a subterranean formation
Stéphane Jouenne, Bizanos (FR); Guillaume Heurteux, Morlaàs (FR); and Nicolas Passade-Boupat, Idron (FR)
Assigned to TotalEnergies OneTech, Courbevoie (FR)
Appl. No. 17/615,283
Filed by TotalEnergies SE, Courbevoie (FR)
PCT Filed Jun. 7, 2019, PCT No. PCT/IB2019/000763
§ 371(c)(1), (2) Date Nov. 30, 2021,
PCT Pub. No. WO2020/245622, PCT Pub. Date Dec. 10, 2020.
Prior Publication US 2022/0220359 A1, Jul. 14, 2022
Int. Cl. C09K 8/524 (2006.01); C09K 8/588 (2006.01); E21B 43/20 (2006.01)
CPC C09K 8/524 (2013.01) [C09K 8/588 (2013.01); E21B 43/20 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of treating an injection well, comprising:
adding at least one compound of formula (I):
[P+(R1—Y—R2)4]zXz−  (I)
wherein:
Y is chosen from an oxygen atom or an NH group;
R1 is a linear or branched alkyl radical having from 1 to 15 carbon atoms;
R2 is chosen from a hydrogen atom or a linear or branched alkyl radical having from 1 to 14 carbon atoms;
Xz− is a monovalent anion or a divalent anion, or a trivalent anion, or a tetravalent anion group;
z is a number from 1 to 4;
to an aqueous medium to form an injection stream;
injecting the injection stream into a subterranean formation which comprises at least one polymer, via the injection well, the subterranean formation comprising the at least one polymer prior to the injection of the injection stream,
enhancing the injectivity of the injection well by degrading the at least one polymer;
wherein the injection stream is devoid of polymer, and
the method further comprises maintaining or restoring the injectivity of the injection well at a level of at least 50% relative to a maximal injectivity of the injection well.