	US 11,667,826 B2
	High density brine with low crystallization temperature
Hui Joyce Zhang, Sugar Land, TX (US); Xia Wei, Houston, TX (US); and Steven Young, Cypress, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Oct. 14, 2021, as Appl. No. 17/450,900.
Application 17/450,900 is a division of application No. 15/276,153, filed on Sep. 26, 2016, granted, now 11,149,180.
Claims priority of provisional application 62/235,176, filed on Sep. 30, 2015.
Prior Publication US 2022/0213374 A1, Jul. 7, 2022
Int. Cl. C09K 8/05 (2006.01); C09K 8/516 (2006.01); E21B 33/13 (2006.01); C09K 8/504 (2006.01); C09K 8/03 (2006.01); C09K 8/42 (2006.01); C09K 8/57 (2006.01); E21B 21/00 (2006.01)

CPC C09K 8/05 (2013.01) [C09K 8/032 (2013.01); C09K 8/426 (2013.01); C09K 8/5045 (2013.01); C09K 8/516 (2013.01); C09K 8/572 (2013.01); E21B 21/003 (2013.01); E21B 33/13 (2013.01); C09K 2208/10 (2013.01)]

12 Claims

1. A wellbore fluid, comprising:

a first aqueous base fluid; and

a plurality of silica nanoparticles suspended in the first aqueous base fluid, wherein the nanoparticles are present in the fluid in an amount to have an effect of decreasing a crystallization temperature by at least 4 to 55° F. as compared to a second aqueous base fluid without the silica nanoparticles; wherein the amount of nanoparticles ranges from 1 wt % to 35 wt % of total weight of the wellbore fluid; wherein the aqueous base fluid is a completion brine with a density in the range of 11 ppg to 18 ppg.