	US 12,071,838 B2
	Viscoelastic surfactants for acid diversion in downhole operations
Rajendra Arunkumar Kalgaonkar, Dhahran (SA); Mohammed Abudullah Bataweel, Dhahran (SA); Nour Othman Baqader, Khobar (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 Oct. 7, 2022, as Appl. No. 17/938,809.
Prior Publication US 2024/0133279 A1, Apr. 25, 2024
Int. Cl. E21B 43/26 (2006.01); C09K 8/60 (2006.01); E21B 33/138 (2006.01)

CPC E21B 43/26 (2013.01) [C09K 8/602 (2013.01); C09K 2208/30 (2013.01)]

9 Claims

1. A method of controlling a permeability zone in a reservoir, comprising:

introducing a diverter agent comprising a morpholinium based zwitterionic surfactant including a sulfonate terminal moiety, an ammonium-based zwitterionic surfactant, and an activator in a wellbore such that the diverter agent contacts a high permeability zone in the reservoir,

wherein upon heating in the wellbore the activator gels the diverter agent to form a gelled diverter agent in the high permeability zone, forming a zone of decreased permeability.