US 11,814,584 B2
Branched block copolymer for enhanced oil recovery in carbonate formations
Sivaprakash Shanmugam, Houston, TX (US); and Carl Thaemlitz, Houston, TX (US)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Feb. 4, 2022, as Appl. No. 17/592,592.
Claims priority of provisional application 63/145,568, filed on Feb. 4, 2021.
Claims priority of provisional application 63/145,565, filed on Feb. 4, 2021.
Claims priority of provisional application 63/145,571, filed on Feb. 4, 2021.
Claims priority of provisional application 63/145,570, filed on Feb. 4, 2021.
Prior Publication US 2022/0251442 A1, Aug. 11, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/88 (2006.01); C09K 8/588 (2006.01)
CPC C09K 8/887 (2013.01) [C09K 8/588 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of polymer flooding within a carbonate formation the method comprising:
injecting a treatment fluid composition into a wellbore, the treatment fluid composition comprising a base fluid and a viscosifier comprising a branched block copolymer, wherein the branched block copolymer is a crosslinked, polymerized reaction product of crosslinker C and monomer A and monomer B and monomer D; and
increasing hydrocarbon production from the wellbore, wherein
the crosslinker C is N,N-methylene bis(acrylamide), and
the monomer A, the monomer B, and the monomer D are chosen from the group consisting of acrylic acid, 2 acrylamido 2 methylpropane sulfonic acid, 2 acrylamido ethyl phosphonic acid, maleic acid, N,N dimethylacrylamide, (3 acrylamidopropyl)trimethylammonium chloride, 2 hydroxyethyl acrylate, styrene 4 sulfonic acid sodium salt, adenosine monophosphate, poly(ethylene glycol) methyl ether acrylate, and lauryl acrylate.