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.

公开(公告)号：US20230392064A1

公开(公告)日：2023-12-07

申请号：US18250045

申请日：2021-10-21

Applicant: ENI S.P.A.

Inventor： Giuseppe MADDINELLI ,  Stefano CARMINATI ,  Davide MOSCATELLI ,  Matteo MARALDI

IPC: C09K8/035 ,  C08F220/38

CPC classification number: C09K8/035 ,  C08F220/387

Abstract: A new class of multifunctional tracers has been synthesised for use in the oil industry, specifically during waterflooding operations. They are used either in a traditional way (i.e., mapping the connections of oilfield selections) or to provide information on important physical-chemical parameters (such as oil content, temperature and rock permeability) useful for optimizing the oilfield management and subsequent improvement/increase in oil extraction. The multifunctional tracers have a polymer chain having a plurality of units different from one another and recurring along the chain and having respective specific functionalities. The units have at least a first rock-repulsive unit, which is configured to provide an effect of electrostatic repulsion towards rock, and at least a second detectable unit, which is configured to allow detectability of the tracer; and optionally at least a third unit, which is configured to detect a parameter or features of an oilfield, in particular oil saturation and temperature.