US 11,884,877 B2
Method for removing fouling using carbonic acid
Fernando Antonio Moreira Da Silva, Rio de Janeiro (BR); Mario Germino Ferreira Da Silva, Rio de Janeiro (BR); Patricia Braga Gusmao, Rio de Janeiro (BR); and Valtair Marcos Cristante, 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. 25, 2022, as Appl. No. 17/973,352.
Claims priority of application No. 10 2021 021444 9 (BR), filed on Oct. 25, 2021.
Prior Publication US 2023/0127921 A1, Apr. 27, 2023
Int. Cl. E21B 37/06 (2006.01); C09K 8/528 (2006.01); C09K 8/44 (2006.01); C09K 8/42 (2006.01)
CPC C09K 8/528 (2013.01) [C09K 8/426 (2013.01); C09K 8/44 (2013.01); E21B 37/06 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method to remove calcium carbonate fouling, the method comprising:
aligning carbon dioxide with an atomizer to prepare a carbonic acid solution;
aligning water with the atomizer to prepare the carbonic acid solution;
adding a calcium carbonate fouling inhibitor to the carbonic acid solution produced by mixing the carbon dioxide with the water to produce a carbon dioxide solution; and
pumping the carbon dioxide solution through lines aligned with a service or gas-lift line to be injected into a well string within a reservoir, wherein the injection of a volume of the carbon dioxide solution into the well string is followed by water and diesel plug for displacement and injection into the reservoir.