Abstract: A method can include receiving real time data where the real time data include at least pressure sensor data from multiple pressure sensors of a hydrocarbon fluid production network for multiple locations in the hydrocarbon fluid production network; generating an expected operational region in a multidimensional domain using at least a portion of the real time data; operating a leak detection system using the expected operational region; tracking at least a portion of the real time data in the multidimensional domain; and issuing a leak detection signal responsive to the tracking indicating an excursion from the expected operational region, where the leak detection signal indicates the presence of a leak in the hydrocarbon fluid production network.

Abstract: A method can include detecting instability of multiphase fluid flow in a multiphase fluid production system using sensor measurements from the multiphase fluid production system; and, responsive to the detection of instability, increasing gas injection into the multiphase fluid production system until a variation metric of the sensor measurements decreases to a level indicative of stable multiphase fluid flow in the multiphase fluid production system.

Abstract: A method is provided for controlling a managed pressure drilling system. The method comprises providing a fast system interpretation model for the operation of the managed pressure drilling system, obtaining real-time measurements from one or more sensors regarding the operation of the managed pressure drilling system, using the measurements to calibrate the fast system interpretation model for the managed pressure drilling system in real-time and using a predictive controller to run the calibrated fast system interpretation model to a time horizon in the future.

Abstract: A method includes receiving measurement information from a hydrocarbon fluid production network where the measurement information includes pressure data and fluid flow data; receiving simulated information from a model-based framework for the hydrocarbon fluid production network that includes boundary conditions based at least in part on at least a portion of the measurement information; comparing the measurement information and the simulated information to detect a fluid leak in the hydrocarbon fluid production network; determining a location of the fluid leak in the hydrocarbon fluid production network; and outputting the location of the fluid leak in the hydrocarbon fluid production network.

Abstract: A method can include receiving a model of a fluid production network where the model includes a plurality of sub-models; synchronizing simulation of the plurality of sub-models with respect to time; and outputting values for fluid flow variables of the model.

Abstract: Method for controlling bottomhole pressure in a borehole during managed pressure drilling. In the drilling procedure fluid is circulated down a drillstring and to surface through an annulus between the drillstring and an inner-wall of the borehole. A compressor/pump is used to inject gas into the returning drilling fluid at a gas injection point. The method comprises receiving a target bottomhole pressure; determining actual bottomhole pressure during the procedure; and adjusting a variable as directed by a feedback controller, which operates to reduce the difference between the target pressure and the measured pressure. The manipulated variable may be one or any combination of: (1) pressure of drilling fluid at the entry of the fluid into the drillstring, (2) the flow rate of drilling fluid out of the drillstring into the annulus, (3) pressure of the gas exiting from the compressor, and (4) the injection rate of the gas.

Abstract: A method can include receiving a model of a fluid production network where the model includes a plurality of sub-models; synchronizing simulation of the plurality of sub-models with respect to time; and outputting values for fluid flow variables of the model.

Abstract: A method is provided for controlling a managed pressure drilling system. The method comprises providing a fast system interpretation model for the operation of the managed pressure drilling system, obtaining real-time measurements from one or more sensors regarding the operation of the managed pressure drilling system, using the measurements to calibrate the fast system interpretation model for the managed pressure drilling system in real-time and using a predictive controller to run the calibrated fast system interpretation model to a time horizon in the future.

Abstract: A method for stabilizing a multiphase flow in a flow line, where instability of the multiphase flow is caused by at least one slug. At least one pressure variable is continuously measured at a flow line inlet upstream of the point where the main part of the slug is generated. The pressure variable is supplied to a dynamic feedback controller, wherein the pressure variable upstream of the slug is an input to the dynamic feedback controller. An output of the dynamic feedback controller is continuously calculated. A control valve at said flow line is controlled by the output from the dynamic feedback controller, wherein the multiphase flow is stabilized throughout the flow line.

Abstract: A method and stabilizing gas lift controller for controlling the production flow rate of an oil well, which well comprises at least one gas injection choke (3) and/or at least one production choke (2), the choke or chokes being controlled as a function of process measurements, characterized in that pressure, temperature and flow rates are stabilized through active feedback control and continuous manipulation of said choke or chokes as a dynamic function of available process measurements.