US 12,152,190 B1
Weighted drilling fluid composition
Ashraf Ahmed, Dhahran (SA); Salaheldin Elkatatny, Dhahran (SA); and Sagheer Onaizi, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Aug. 12, 2024, as Appl. No. 18/800,227.
Application 18/800,227 is a continuation of application No. 18/297,041, filed on Apr. 7, 2023, granted, now 12,110,447.
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/03 (2006.01); E21B 41/02 (2006.01); E21B 21/06 (2006.01)
CPC C09K 8/032 (2013.01) [E21B 41/02 (2013.01); C09K 2208/18 (2013.01); C09K 2208/20 (2013.01); E21B 21/067 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A weighted drilling fluid composition, comprising:
an aqueous base fluid;
a starch in an amount of 0.5 to 5 wt. % based on a total weight of the weighted drilling fluid composition;
barite in an amount of 0.5 to 5 wt. % based on a total weight of the weighted drilling fluid composition;
at least one additive selected from the group consisting of an anti-foaming agent, a viscosity modifier, a shale stabilizer, an alkali compound, and a bridging agent;
0.01 to 0.5 wt. % of particles of steel slag, based on a total weight of the weighted drilling fluid composition; and
iron gluconate particles having an average particle size (D50) in a range of 10 to 60 μm;
wherein the steel slag comprises 30 to 60 wt. % ZnO, 20 to 50 wt. % Na2O, 5 to 25 wt. % Cl, and 0.5 to 6 wt. % Fe2O3, each wt. % based on a total weight of the steel slag as determined by X-ray fluorescence (XRF); and
wherein the particles of the steel slag have an irregular shape, and an average particle size (D50) in a range of 5 to 20 μm.