US 12,435,262 B2
Injection fluids comprising an anionic surfactant for treating unconventional formations
Dustin L Walker, Dallas, TX (US); Gayani W. Pinnawala, Houston, TX (US); Nabijan Nizamidin, Emeryville, CA (US); Varadarajan Dwarakanath, Houston, TX (US); Guo-Qing Tang, Mountain View, CA (US); Dustin J. Lowry, Pinole, CA (US); Tetsuo Art Inouye, Sebastopol, CA (US); and Taimur Malik, Houston, TX (US)
Assigned to CHEVRON U.S.A. INC., San Ramon, CA (US)
Filed by CHEVRON U.S.A. INC., San Ramon, CA (US)
Filed on Sep. 11, 2023, as Appl. No. 18/464,691.
Application 18/464,691 is a continuation of application No. 16/635,733, granted, now 11,753,582, previously published as PCT/US2018/044707, filed on Jul. 31, 2018.
Claims priority of provisional application 62/538,883, filed on Jul. 31, 2017.
Prior Publication US 2024/0271032 A1, Aug. 15, 2024
Int. Cl. C09K 8/60 (2006.01); C09K 8/68 (2006.01); C09K 8/74 (2006.01); C09K 8/80 (2006.01); C09K 8/86 (2006.01); E21B 43/267 (2006.01); E21B 43/27 (2006.01); E21B 47/11 (2012.01)
CPC C09K 8/604 (2013.01) [C09K 8/602 (2013.01); C09K 8/68 (2013.01); C09K 8/74 (2013.01); C09K 8/80 (2013.01); C09K 8/86 (2013.01); E21B 43/267 (2013.01); E21B 43/27 (2020.05); E21B 47/11 (2020.05); C09K 2208/10 (2013.01); C09K 2208/12 (2013.01); C09K 2208/26 (2013.01); C09K 2208/28 (2013.01); C09K 2208/32 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method for treating an unconventional subterranean formation with a fluid, comprising:
(a) combining a single-phase liquid surfactant package comprising a primary surfactant with an aqueous-based injection fluid to form a low particle size injection fluid; and
(b) introducing the low particle size injection fluid into the unconventional subterranean formation;
wherein the primary surfactant comprises C10-C16 disulfonate; and
wherein the low particle size injection fluid is aqueous stable and has a maximum particle size of less than 0.1 micrometers in diameter in particle size distribution measurements performed at a temperature and salinity of the unconventional subterranean formation.