US 12,258,821 B2
Encapsulated lost circulation materials based on shape-memory polymer foam
Rostyslav Dolog, Houston, TX (US); Qusai A. Darugar, Houston, TX (US); Radhika Suresh, Sugar Land, TX (US); and Oleg Mazyar, Katy, TX (US)
Filed by Baker Hughes Oilfield Operations LLC, Houston, TX (US)
Filed on Aug. 14, 2023, as Appl. No. 18/449,378.
Prior Publication US 2025/0059837 A1, Feb. 20, 2025
Int. Cl. E21B 21/00 (2006.01); C09K 8/035 (2006.01); C09K 8/518 (2006.01)
CPC E21B 21/003 (2013.01) [C09K 8/035 (2013.01); C09K 8/518 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An encapsulated lost circulation material comprising a particulate having
a core comprising a compressed shape-memory polymer foam and a disintegrating agent, the disintegrating agent comprising a phase change material; and
a shell encapsulating the core,
wherein the phase change material has (i) a phase transition temperature between 125° F. and 1,000° F. and (ii) a volumetric expansion of at least 3% during a phase transition relative to a volume of the phase change material before the phase transition wherein the volumetric expansion exerts sufficient pressure on the shell to break the shell and release the compressed shape-memory polymer foam.