Petroleo Brasileiro S.a. - Petrobras

Carlos Alberto Bandeira Ribeiro

Roberto Rodrigues

Daniel Monteiro Pimentel

Renato De Freitas Soares

Everton Da Rocha Nascimento

The present invention provides a nonresident system for depressurizing subsea apparatus and lines comprising a depressurizing tool () adapted for being coupled to an ROV interface () of a subsea apparatus, wherein the depressurizing tool () is coupled to an ROV (), wherein: the ROV interface () comprises a first pipeline () for connection to a first hydrocarbon transport line (), a second pipeline () for connection to second hydrocarbon transport line (), and a connection mandrel (); and the depressurizing tool () comprises a suction line () adapted for being connected to the first pipeline () for connection to the first hydrocarbon transport line; a discharge line () adapted for being connected to the second pipeline () for connection to the second hydrocarbon transport line; a pump (); and a connector () adapted for being connected to the connection mandrel () of the ROV interface (). A method is also provided for depressurizing subsea apparatus and lines, comprising the steps of: removing a blind cap () from an ROV interface () with aid of an ROV (); coupling a depressurizing tool () to the ROV interface () of a subsea apparatus (); suction and removal of fluid from a first hydrocarbon transport line, wherein the first hydrocarbon transport line comprises hydrate formation; and pressurizing and reinjecting the fluid into a second hydrocarbon transport line.

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Rio de Janeiro, Brazil

Carlos Alberto Bandeira Ribeiro