	US 12,441,932 B2
	Calcite impregnated with scale inhibitor composition, process of obtaining the same and process for combating circulation loss
Mario Germino Ferreira Da Silva, Rio de Janeiro (BR)
Assigned to PETRÓLEO BRASILEIRO S.A.—PETROBRAS, Rio de Janeiro (BR)
Filed by PETRÓLEO BRASILEIRO S.A.—PETROBRAS, Rio de Janeiro (BR)
Filed on Oct. 4, 2023, as Appl. No. 18/481,040.
Claims priority of application No. 10 2022 020375 0 (BR), filed on Oct. 7, 2022.
Prior Publication US 2024/0117241 A1, Apr. 11, 2024
Int. Cl. C09K 8/588 (2006.01)

CPC C09K 8/588 (2013.01)

14 Claims

1. A composition comprising:

a viscous mattress comprising:

an antifoam agent;

xanthan gum

hydroxypropyl starch having a concentration of 7 to 9 lb/bbl;

magnesium peroxide having a concentration of 0.5 to 1.5 lb/bbl; and

calcite impregnated with a scale inhibitor and suspended within the viscous mattress, wherein the calcite is present in a concentration between 15 lb/bbl to 25 lb/bbl.