公开(公告)号：US20210163692A1

公开(公告)日：2021-06-03

申请号：US17267894

申请日：2019-08-19

Applicant: ENI S.P.A.

Inventor： Stefano CARMINATI ,  Giuseppe MADDINELLI ,  Davide MOSCATELLI ,  Mattia SPONCHIONI

IPC: C08G81/02 ,  C08F293/00 ,  C09K8/508 ,  E21B43/16

Abstract: A fluid for controlling the permeability of a subterranean formation having an aqueous solution of at least one thermo-responsive polymer with block structure A-B-A′, wherein A and A′, the same as or different from one another, each represent a thermo-responsive oligomer group, and B is an oligomer group having n repeat units, the same as or different from one another. At least one of the repeat units has a solubility of the corresponding monomer, in water at 20° C., equal to or greater than 120 g/l, and
n is a whole number within the range 30-1000.
The fluid is also used in a method for controlling the permeability of a subterranean formation.