US 12,441,925 B2
Self-destructive barite filter cake in water-based and oil-based drilling fluids
Ayman R. Al-Nakhli, Dhahran (SA); Mohamed Ahmed Nasr El Din Mahmoud, Dhahran (SA); and Zeeshan Tariq, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA); and KING FAHD UNIVERSITY OF PETROLEUM & MINERALS, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA); and KING FAHD UNIVERSITY OF PETROLEUM & MINERALS, Dhahran (SA)
Filed on Apr. 18, 2024, as Appl. No. 18/639,736.
Application 18/639,736 is a continuation of application No. 17/721,061, filed on Apr. 14, 2022, abandoned.
Prior Publication US 2024/0279527 A1, Aug. 22, 2024
Int. Cl. C09K 8/32 (2006.01); C09K 8/03 (2006.01); C09K 8/84 (2006.01); C09K 8/92 (2006.01); C09K 23/18 (2022.01)
CPC C09K 8/032 (2013.01) [C09K 8/84 (2013.01); C09K 8/92 (2013.01); C09K 23/18 (2022.01)] 12 Claims
 
1. A drilling fluid composition comprising:
a weighting agent;
nitrite-containing copolymer microparticles comprising a nitrate-containing compound and a copolymer, where the copolymer encapsulates the nitrite-containing compound forming the nitrate-containing copolymer microparticles; and
ammonium-containing copolymer microparticles comprising an ammonium-containing compound and the copolymer, where the copolymer encapsulates the ammonium-containing compound forming the ammonium-containing copolymer microparticles;
where the copolymer is a combination of esters and acids,
wherein the copolymer is comprised of a uniformly sized microporous tubular membrane having a plurality of micropores, and
where a density of the drilling fluid composition is substantially similar to a density of a comparable composition devoid of the nitrite-containing copolymer microparticles and the ammonium-containing copolymer microparticles, where the comparable composition is a drilling fluid.