US 12,281,256 B2
Formulation for inhibiting water permeation in an extraction well of a hydrocarbon fluid from an underground reservoir
Davide Moscatelli, Arese (IT); Lucilla Del Gaudio, San Donato Milanese (IT); Paola Albonico, San Donato Milanese (IT); Alessandra Belloni, San Donato Milanese (IT); and Alberto Cesana, Verano Brianza (IT)
Assigned to ENI S.P.A., Rome (IT)
Filed by ENI S.P.A., Rome (IT)
Filed on Sep. 27, 2023, as Appl. No. 18/373,322.
Application 18/373,322 is a division of application No. 17/440,985, granted, now 11,859,125, previously published as PCT/IB2020/052536, filed on Mar. 19, 2020.
Claims priority of application No. 102019000004191 (IT), filed on Mar. 22, 2019.
Prior Publication US 2024/0026210 A1, Jan. 25, 2024
Int. Cl. C09K 8/50 (2006.01); C09K 8/502 (2006.01); C09K 8/516 (2006.01); C09K 8/588 (2006.01); E21B 43/20 (2006.01)
CPC C09K 8/502 (2013.01) [C09K 8/516 (2013.01); C09K 8/588 (2013.01); E21B 43/20 (2013.01)] 20 Claims
 
1. A treatment fluid suitable for a hydrocarbon fluid extraction well, the treatment fluid comprising a water-in-oil emulsion comprising:
an oily continuous phase; and
an aqueous discontinuous phase comprising water and a plurality of particles comprising a hydrogel comprising a cationic polymer,
wherein the cationic polymer comprises no anionic unit, and
wherein the cationic polymer comprises, in polymerized form, (1) a first monomer comprising a cationic group and (2) a second monomer comprising an ethylenic unsaturation and a polyoxyethylene chain.