Abstract: Calibration of a multiphase flow meter to be used in a production process can be achieved by using a closed multiphase flow loop. In the device and method of the invention, the flow rates of each phase, oil and water, are individually measured after their separation using a separation vessel, and used as a reference for the calibration of a multiphase flow meter. Flow loop control is achieved by combining an oil-water interface position control and an oil level control in the separation vessel.

Abstract: Automated measurement and oil well production control may be achieved by using a vertical separator, the discharge flow of which is continuously adjusted by setting the opening of a control valve, determined by the liquid level inside the separator. The automation of the control method allows real-time measurements of several process variables as well as reduced measurement times and also works as a safety layer for a production process. The control method is independent of well production and is therefore suited to controlling marginal wells.