Abstract: A modular exploration and production system combined with an oil well testing and service vessel is provided, the vessel comprising equipment for separating hydrocarbons and/or associated fluids and solids by means of a processing plant. The vessel is equipped with suitable equipment packages for all required functionality, so fluid received from wells, piping and installations at sea or inland waters is processed for the separation, control and ecological handling of the mixture (crude oil, gas, solids, chemicals and oily or production water) in a plurality of phases such as exploration, drilling, finishing, repair, stimulation, production, and production measurement.