US 12,359,112 B2
Nanosilica-based compositions and related methods for providing water shut off to subterranean formations
Rajendra Arunkumar Kalgaonkar, Dhahran (SA); and Qasim Abdullah Sahu, Muntazah (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Jun. 19, 2023, as Appl. No. 18/337,358.
Prior Publication US 2024/0417617 A1, Dec. 19, 2024
Int. Cl. E21B 33/138 (2006.01); C09K 8/516 (2006.01)
CPC C09K 8/516 (2013.01) [E21B 33/138 (2013.01); C09K 2208/10 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method comprising:
introducing a water shut off composition into a water producing zone in a wellbore, the water shut off composition comprising alkaline nanosilica particles and hydrolysable ester-based 3D engineered non-convex particles having a cross-shaped cross-section in each of the xy-plane, the yz-plane, and the xz-plane, and wherein the hydrolysable ester-based 3D engineered non-convex particles have a surface consisting of 6 protrusions;
degrading the hydrolysable ester-based 3D engineered non-convex particles to release an acid within the water producing zone in the wellbore; and reacting the acid and the alkaline nanosilica particles, thereby forming a solid within the water producing zone in the wellbore.