US 11,952,534 B2
Method for the combined application of scale remover and inhibitor
Mario Germino Ferreira Da Silva, Rio de Janeiro (BR); Sergio Taveira De Camargo Junior, Rio de Janeiro (BR); Tiago Cavalcante Freitas, Rio de Janeiro (BR); Giselle Maria Lopes Leite Da Silva, Aracaju (BR); Francisca Ferreira Do Rosario, Rio de Janeiro (BR); Francileide Gomes Da Costa, Rio de Janeiro (BR); Katia Regina Silva Alves Da Rosa, Rio de Janeiro (BR); and Rosane Alves Fontes, Petrópolis (BR)
Assigned to Petróbras Brasileiro S. A.—Petrobras, Rio de Janeiro (BR)
Appl. No. 17/790,175
Filed by Petróleo Brasileiro S.A.—Petrobras, Rio de Janeiro (BR)
PCT Filed Dec. 18, 2020, PCT No. PCT/BR2020/050566
§ 371(c)(1), (2) Date Jun. 30, 2022,
PCT Pub. No. WO2021/134120, PCT Pub. Date Jul. 8, 2021.
Claims priority of application No. 10 2019 028273 8 (BR), filed on Dec. 30, 2019.
Prior Publication US 2023/0043123 A1, Feb. 9, 2023
Int. Cl. C09K 8/52 (2006.01); E21B 37/06 (2006.01)
CPC C09K 8/52 (2013.01) [E21B 37/06 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method comprising:
preparing a scale remover solution;
preparing a scale inhibitor squeeze solution;
mixing the scale remover solution and the scale inhibitor squeeze solution, to thereby form a mixture; and
injecting the mixture into a reservoir at a temperature of 60° C., using water produced from a well, with a calcium content ranging from 2,080 to 20,000 mg/L, to provide simultaneously removal of scale followed by inhibition of scale from and on reservoir rock.