US 11,939,865 B2
Method for the identification of operational problems in wells that produce by gas-lift
Alcino Resende De Almeida, Rio de Janeiro (BR); Andre Leal Gaio, Macaé (BR); Danielle Aguiar De Araujo, Vitória (BR); Maria Aparecida De Melo, Rio de Janeiro (BR); Hercilio De Angeli Honorato, Rio de Janeiro (BR); and Cicero Pereira De Carvalho Neto, Macaé (BR)
Assigned to Petróleo Brasileiro S.A.—Petrobras, Rio de Janeiro (BR)
Appl. No. 17/792,139
Filed by Petróleo Brasileiro S.A.—Petrobras, Rio de Janeiro (BR)
PCT Filed Dec. 14, 2020, PCT No. PCT/BR2020/050543
§ 371(c)(1), (2) Date Jul. 11, 2022,
PCT Pub. No. WO2021/119784, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10 2019 027099 3 (BR), filed on Dec. 18, 2019.
Prior Publication US 2023/0134816 A1, May 4, 2023
Int. Cl. E21B 43/12 (2006.01); E21B 49/08 (2006.01); G01M 3/22 (2006.01); E21B 47/117 (2012.01)
CPC E21B 49/081 (2013.01) [E21B 43/122 (2013.01); G01M 3/22 (2013.01); E21B 47/117 (2020.05)] 6 Claims
OG exemplary drawing
 
1. A method for the identification of operational problems in wells that produce by gas-lift, comprising:
allowing a hydrodynamic evaluation of a well/lines set by injection of at least one alcohol in a gas-lift line;
collecting samples at a well sampling point; and
detecting alcohol passage and return by direct analysis of information about process variables provided by well instrumentation,
wherein the injected at least one alcohol is ethanol.