US 11,718,776 B2
Method to use loss circulation material composition comprising acidic nanoparticle based dispersion and sodium bicarbonate in downhole conditions
Vikrant Wagle, Dhahran (SA); Rajendra Arunkumar Kalgaonkar, Dhahran (SA); and Abdullah AlYami, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Dec. 16, 2021, as Appl. No. 17/552,395.
Prior Publication US 2023/0193112 A1, Jun. 22, 2023
Int. Cl. C09K 8/514 (2006.01); C09K 8/504 (2006.01); C01B 33/14 (2006.01)
CPC C09K 8/5045 (2013.01) [C01B 33/14 (2013.01); C09K 8/514 (2013.01); C01P 2004/64 (2013.01); C01P 2006/10 (2013.01); C01P 2006/12 (2013.01); C09K 2208/10 (2013.01)] 17 Claims
 
1. A loss circulation material, consisting essentially of:
(a) an acidic nanosilica dispersion,
wherein the acidic nanosilica dispersion consists of acidic silica nanoparticles, an oxy chloride stabilizer, and water, and
wherein the acidic nanosilica dispersion has a pH in a range of 3 to 6;
(b) an activator that is of one or more from the group consisting of sodium bicarbonate, sodium chloride, or an amine salt,
wherein the activator is present in an amount in a range of 1 wt % to 40 wt % of the loss circulation material;
optionally, (c) a cationic species that is a positive ion or a cationic polymer;
optionally, (d) a viscosifier that is one or more selected from the group consisting of a biopolymer and synthetic polymer; and
optionally, (e) a salt that is a monovalent salt, a divalent salt, or a combination of monovalent salt and divalent salt.