Pipe control method for transporting liquid and gaseous hydrocarbons between offshore production plant and treatment plant involves controlling an outlet choke and control valve of gas injection pipe in start up and then production phase

摘要

The invention relates to a method for controlling a device for transporting hydrocarbons in the form of a mixture of liquid and gas between production means (1) and a treatment plant (10).The method according to the invention for controlling a device comprising a hydrocarbons transport pipe (6) fitted with an adjustable-aperture outlet choke (9) to which a gas-injection pipe (16) fitted with a control valve (15) is connected, is characterized in that it includes a start-up phase which consists in performing the following sequence of steps:a step of initiating the transport of hydrocarbons,a step of ramping up to transport speed, then a production phase, during which phases the outlet choke (9) and the control valve (15) are operated in such a way as to maintain the stability of the pressure in the pipe (6) for transporting the hydrocarbons produced.The invention finds an application in the operation of off-shore oil production installations.