US 11,739,255 B2
Methods and compositions of piperazine-based viscoelastic surfactants as diversion agents
Rajendra Arunkumar Kalgaonkar, Dhahran (SA); Mohammed Abudullah Bataweel, Dhahran (SA); Eyad Alali, Dammam (SA); Nisar Ullah, Dhahran (SA); and Muhammad Mansha, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA); and KING FAHD UNIVERSITY OF PETROLEUM & MINERALS, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA); and KING FAHD UNIVERSITY OF PETROLEUM & MINERALS, Dhahran (SA)
Filed on Nov. 12, 2021, as Appl. No. 17/454,695.
Prior Publication US 2023/0151263 A1, May 18, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 43/16 (2006.01); C09K 8/584 (2006.01); E21B 43/27 (2006.01)
CPC C09K 8/584 (2013.01) [E21B 43/16 (2013.01); E21B 43/27 (2020.05); C09K 2208/30 (2013.01)] 9 Claims
 
1. A wellbore fluid, comprising:
a first surfactant having a structure represented by Formula (I):

OG Complex Work Unit Chemistry
wherein Y1, Y2, Y3, Y4 are each, independently, a sulfonate, a carboxylate, an ester or a hydroxyl group, m is an integer ranging from 2 to 3, and n, o, and k are each, independently, integers ranging from 2 to 10;
a second surfactant having a structure represented by Formula (III):

OG Complex Work Unit Chemistry
wherein R2 is a C15-C27 hydrocarbon group or a C15-C29 substituted hydrocarbon group, R3 is a C1-C10 hydrocarbon group, and p and q are each, independently, an integer ranging from 1 to 4;
an activator; and
an aqueous base fluid.