US 12,331,245 B2
Use of a borate-acid buffer in oil and gas operations
Nabijan Nizamidin, Houston, TX (US); Gayani W. Pinnawala, Katy, TX (US); Guo-Qing Tang, Mountain View, CA (US); Varadarajan Dwarakanath, Houston, TX (US); Gregory A. Winslow, Houston, TX (US); Jordan Taylor Isbell, Houston, TX (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 Oct. 17, 2023, as Appl. No. 18/488,079.
Application 17/853,283 is a division of application No. 16/528,183, filed on Jul. 31, 2019, granted, now 11,377,586, issued on Jul. 5, 2022.
Application 18/488,079 is a continuation of application No. 17/853,283, filed on Jun. 29, 2022, granted, now 11,787,998.
Claims priority of provisional application 62/712,944, filed on Jul. 31, 2018.
Prior Publication US 2024/0052234 A1, Feb. 15, 2024
Int. Cl. C09K 8/584 (2006.01); C09K 8/588 (2006.01); C09K 8/60 (2006.01); C09K 8/66 (2006.01); C09K 8/68 (2006.01); C09K 8/80 (2006.01); E21B 43/20 (2006.01); E21B 43/26 (2006.01); E21B 47/11 (2012.01)
CPC C09K 8/584 (2013.01) [C09K 8/588 (2013.01); C09K 8/602 (2013.01); C09K 8/665 (2013.01); C09K 8/68 (2013.01); C09K 8/80 (2013.01); E21B 43/20 (2013.01); E21B 43/26 (2013.01); E21B 47/11 (2020.05)] 21 Claims
OG exemplary drawing
 
1. An aqueous composition comprising (i) a borate-acid buffer, (ii) a surfactant package, (iii) water, and (iv) a water-soluble polymer,
wherein the borate-acid buffer exhibits a capacity to buffer at a pH of from 6.0 to 8.5; and
wherein the aqueous composition has a viscosity of from 0.3 mPas to 1000 mPas at 20° C.