US 11,753,574 B2
Packer fluid with nanosilica dispersion and sodium bicarbonate for thermal insulation
Vikrant Wagle, Dhahran (SA); Rajendra Kalgaonkar, Dhahran (SA); and Abdullah S. Al-Yami, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Jul. 30, 2021, as Appl. No. 17/390,075.
Prior Publication US 2023/0035211 A1, Feb. 2, 2023
Int. Cl. C09K 8/504 (2006.01); C09K 8/508 (2006.01); E21B 33/138 (2006.01); C09K 8/516 (2006.01)
CPC C09K 8/5045 (2013.01) [C09K 8/508 (2013.01); C09K 8/516 (2013.01); E21B 33/138 (2013.01); C09K 2208/10 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A downhole system, comprising:
a packer sealing an annular space between a downhole inner tubing and an outer tubing; and
an insulating packer fluid if (i) positioned within the annular space and adjacent the packer, and (ii) insulating the inner tubing, wherein the insulating packer fluid comprises:
an acidic nanosilica dispersion, comprising:
silica nanoparticles; and
a stabilizer;
wherein the pH of the acidic nanosilica dispersion ranges from 2 to 5; and
a sodium bicarbonate activator.