	US 12,188,854 B2
	Use of nanofluid to remove oil and salts from rock samples in petroleum systems
Humberto Eustaquio Lopes, Rio de Janeiro (BR); Gerson Felizardo De Sousa Junior, Rio de Janeiro (BR); Carmen Lucia Da Silva Teixeira, Rio de Janeiro (BR); and Marcia Cristina Khalil De Oliveira, Rio de Janeiro (BR)
Assigned to Petróleo Brasileiro S.A.—Petrobras, Rio de Janeiro (BR)
Appl. No. 17/796,540
Filed by Petróleo Brasileiro S.A.—Petrobras, Rio de Janeiro (BR)
PCT Filed Jan. 22, 2021, PCT No. PCT/BR2021/050034 § 371(c)(1), (2) Date Jul. 29, 2022, PCT Pub. No. WO2021/151183, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 10 2020 002064 1 (BR), filed on Jan. 30, 2020.
Prior Publication US 2023/0366793 A1, Nov. 16, 2023
Int. Cl. G01N 1/34 (2006.01); G01N 1/44 (2006.01); G01N 33/24 (2006.01)

CPC G01N 1/34 (2013.01) [G01N 1/44 (2013.01); G01N 33/24 (2013.01)]

4 Claims

1. A method of removal of hydrocarbons and salts from rock samples, the method comprising:

adding a rock sample to a compartment;

immersing the compartment in a nanofluid at a temperature between 4° and 80° C.;

subjecting the compartment, after being immersed, to an ultrasound system with transducers positioned external of the compartment, three times, for 15 minutes each, for two days to remove hydrocarbons;

removing the nanofluid and salt by immersing the rock sample in water and submitting the rock sample to the ultrasound system for 15 minutes, repeating twice; and

drying the sample in an oven after twice repeating the previous step.