US 12,421,444 B2
Polymers and nanoparticles for flooding
S. Sherry Zhu, Waban, MA (US); Ayrat Gizzatov, Cambridge, MA (US); and Marta Antoniv, Cambridge, MA (US)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Apr. 15, 2024, as Appl. No. 18/635,495.
Application 18/635,495 is a division of application No. 18/080,443, filed on Dec. 13, 2022, granted, now 11,987,749.
Application 18/080,443 is a division of application No. 16/883,806, filed on May 26, 2020, granted, now 11,566,165, issued on Jan. 31, 2023.
Claims priority of provisional application 62/854,791, filed on May 30, 2019.
Prior Publication US 2024/0417618 A1, Dec. 19, 2024
Int. Cl. C09K 8/588 (2006.01); C08F 212/14 (2006.01); C08F 220/06 (2006.01); C08F 220/22 (2006.01); C08F 220/24 (2006.01); C08F 220/56 (2006.01); E21B 43/20 (2006.01)
CPC C09K 8/588 (2013.01) [C08F 212/20 (2020.02); C08F 220/06 (2013.01); C08F 220/22 (2013.01); C08F 220/24 (2013.01); C08F 220/56 (2013.01); E21B 43/20 (2013.01); C09K 2208/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
pumping a mixture through a wellbore into a geological formation, the mixture comprising a surfactant, salt, water, and polymer nanoparticles comprising core-shell nanoparticles each having a core and a shell, wherein the core comprises a polystyrene center, and wherein the shell comprises a zwitterionic group and a fluoro functional group covalently attached to the core; and
flowing the mixture through the geological formation, wherein the pumping and the flowing comprise enhanced oil recovery (EOR) comprising flooding, wherein the flooding of the geological formation increases oil recovery from a reservoir in the geological formation, and wherein:
the flooding comprises nanofluid flooding; and
the fluoro functional group comprises at least one of the following structures:

OG Complex Work Unit Chemistry