Patent ID: 11939865
Assignee: PETRÓLEO BRASILEIRO S.A.—PETROBRAS
Field: Civil engineering (Other fields)
Classification: CPC E  G | IPC E  G

Claim 2:
3. 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 a collection of samples is gathered directly in plastic bags by adding one or more drops of demulsifier, and after a waiting time, piercing each bag at its base with a needle, a first jet being discarded and, next, a sample flask being filled, leaving an amount of supernatant oil to avoid ethanol evaporation.