Patent ID: 11939842
Assignee: BAKER HUGHES OILFIELD OPERATIONS LLC
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 0:
1. A method comprising:
disposing a device into a borehole in proximity to a subterranean formation where a filter cake has been formed adjacent thereto, the device comprising a support structure and a shape-memory article disposed at the support structure, the shape-memory article comprising a shape-memory polymer, wherein the device is disposed when the shape-memory article is in a compacted shape;
exposing the shape-memory article to a fluid system to cause the shape-memory article to expand and conform to a surface of the borehole;
exposing the filter cake to the fluid system; and
removing the filter cake with the fluid system;
wherein the fluid system comprises
(i) about 2 to about 40 wt. % of a chelating agent, wherein the chelating is sodium ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetic acid, diammonium ethylenediaminetetraacetic acid, tetraammonium ethylenediaminetetraacetic acid, trisodium dicarboxymethyl alaninate, pentasodium di ethylene-triaminepentaacetate, trisodium N-(hydroxyethyl)-ethylenediaminetriacetate, or a combination thereof,
(ii) about 1 to about 20 wt. % of an activator, wherein the activator is butanol, isobutanol, butoxytriglycol, or a combination thereof,
(iii) about 0.01 to about 3 wt. % of a non-emulsifier, and
(iv) about 30 to about 90 wt. % of water or a brine, and
the filter cake is removed after the shape-memory article has expanded and conformed to the surface of the borehole.