Abstract: A method for automatically controlling a flow in a flow line system including a flow line, a flow line inlet and outlet, and a control valve located in the flow line at the outlet. The method includes controlling the opening of the valve with a control unit. An outlet flow rate is measured or estimated from the flow line. The valve is opened. It is determined if a sudden drop occurs in any of the measurements or estimates. It is decided if a liquid blockage in the flow line is present or approaching. If a liquid blockage is indicated as present or approaching, the opening of the valve is increased by an amount determined by the measurements or estimates. Any further manipulation of the valve is inhibited before a non-zero time period has expired. The steps are repeated. Also a system and a computer program product.

Abstract: A method for automatic feedback control and/or monitoring of an oil and/or gas production system, or part(s) thereof, which includes one or more processing unit(s) and/or one or more flow line(s) and/or one or more controls. The method includes measuring or estimating value(s) of at least one level or pressure or flow rate or load indicator associated with at least one of the processing unit(s) and/or flow line(s) and at least one of calculating setting(s) for the controls based on at least one controlled variable in form of the measured or estimated level or pressure or flow rate or load indicator, including compensating for nonlinearities of the control means or estimating at least one of the oil-, gas-, water-, or liquid flow rate(s) into and/or out of at least one of the processing units and/or flow line(s).

Abstract: Method in an oil and/or a gas production system including a plurality of oil and/or gas wells each producing a multiphase fluid stream, adapted for predicting change in produced fluids resulting from change in manipulated variables. Fitted model parameters which express the relationship between the change in manipulated variables and the produced fluids are determined from a set of historical production measurements. The method includes the steps of choosing a model structure which predicts change in produced fluids as a function of the change in manipulated variables, where the predicted change in produced fluids depends on the value of fitted model parameters, determining fitted model parameters so that predictions of produced fluids match said historical production measurements as closely as possible, and determining a quality tag that describes the uncertainty of the predictions of change in produced fluids.

Abstract: Method in an oil and/or a gas production system including a plurality of oil and/or gas wells each producing a multiphase fluid stream, adapted for predicting change in produced fluids resulting from change in manipulated variables. Fitted model parameters which express the relationship between the change in manipulated variables and the produced fluids are determined from a set of historical production measurements. The method includes the steps of choosing a model structure which predicts change in produced fluids as a function of the change in manipulated variables, where the predicted change in produced fluids depends on the value of fitted model parameters, determining fitted model parameters so that predictions of produced fluids match said historical production measurements as closely as possible, and determining a quality tag that describes the uncertainty of the predictions of change in produced fluids.

Abstract: A method in an oil and/or a gas production system including a plurality of oil and/or gas wells and parameter testers adapted for oil and/or gas production parameter testing. The method is adapted to compare a plurality of options related to the oil and/or gas throughput in the oil and/or gas production system. A plurality of parameter samples are drawn from a parameter distribution. A performance measure is generated for each parameter sample by using the parameter sample and a characterizer for each of the options. An aggregated performance measure is generated for each of the options by using the performance measures.

Abstract: A method for production optimization in an oil and/or a gas production system. The system including at least two flow sources leading to at least one common downstream flow line, and at least one manipulated variable of the production system. The method includes use of a computational model of the production system including an interdependence between flow rates of the flow sources and a flow rate of the downstream flow line, and values of the manipulated variable; a feasible set defined by at least one constraint of the manipulated variable, and an objective function, to be optimized within said feasible set, defined by using the computational model. The method includes splitting by calculation the feasible set into at least two subsets, calculating, for each of the subsets, a best bound of the objective function by using the computational model, and manipulating the manipulated variable by using the best bound to optimize the oil and/or gas production.

Abstract: A method for automatically controlling a flow in a flow line system including a flow line, a flow line inlet and outlet, and a control valve located in the flow line at the outlet. The method includes controlling the opening of the valve with a control unit. An outlet flow rate is measured or estimated from the flow line. The valve is opened. It is determined if a sudden drop occurs in any of the measurements or estimates. It is decided if a liquid blockage in the flow line is present or approaching. If a liquid blockage is indicated as present or approaching, the opening of the valve is increased by an amount determined by the measurements or estimates. Any further manipulation of the valve is inhibited before a non-zero time period has expired. The steps are repeated. Also a system and a computer program product.

Abstract: A method for automatic feedback control and/or monitoring of an oil and/or gas production system, or part(s) thereof, which includes one or more processing unit(s) and/or one or more flow line(s) and/or one or more controls. The method includes measuring or estimating value(s) of at least one level or pressure or flow rate or load indicator associated with at least one of the processing unit(s) and/or flow line(s) and at least one of calculating setting(s) for the controls based on at least one controlled variable in form of the measured or estimated level or pressure or flow rate or load indicator, including compensating for nonlinearities of the control means or estimating at least one of the oil-, gas-, water-, or liquid flow rate(s) into and/or out of at least one of the processing units and/or flow line(s).