US 11,939,842 B2
Fluid systems for expanding shape memory polymers and removing water-based filter cakes
Dorianne A. Castillo, Humble, TX (US); Sebastian Mesa, Bogota (CO); and Diego Arias, Bogota (CO)
Assigned to BAKER HUGHES OILFIELD OPERATIONS LLC, Houston, TX (US)
Filed by Baker Hughes Oilfield Operations LLC, Houston, TX (US)
Filed on Oct. 10, 2022, as Appl. No. 17/962,700.
Claims priority of provisional application 63/253,681, filed on Oct. 8, 2021.
Prior Publication US 2023/0113003 A1, Apr. 13, 2023
Int. Cl. E21B 37/00 (2006.01); C09K 8/44 (2006.01); C09K 8/54 (2006.01); E21B 33/12 (2006.01)
CPC E21B 37/00 (2013.01) [C09K 8/44 (2013.01); C09K 8/54 (2013.01); E21B 33/1208 (2013.01); C09K 2208/32 (2013.01)] 18 Claims
OG exemplary drawing
 
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.