Abstract: Systems, methods, and computer-readable media for modeling slug flow. The method includes receiving a fluid flow model comprising a representation of one or more conduits and a multiphase fluid flow therein, and determining a slug birth rate in the multiphase fluid flow. The slug birth rate is determined based at least partially on a difference between a slug front velocity and a slug tail velocity. The method also includes initiating a slug in the fluid flow model based at least partially on the slug birth rate, and displaying data representative of the slug flow in the model.

Abstract: A method of estimating chordal holdup values of gas, oil, and water (?G, ?O, ?W) for tomographic imaging of a three-phase flow through a volume, including: providing an X-ray source for irradiating through said volume and X-ray sensors for discriminating between a first and a second radiation bands, conducting first calibration measurements (IGS, IOS, IWS) of said first radiation band, conducting second calibration measurements (IGH, IOH, IWH) of said second radiation band, arranging a mixture of two or more fluids, irradiating said volume and conducting X-ray measurements (IS, IH) in said radiation bands, establishing a relationship between a function of holdup values f(?G, ?W) of at least gas and water and said X-ray measurements (IS, IH), searching holdup values (?G, ?W) that minimize said function of holdup values f(?G, ?W) under the constraints of the sum of said holdup values is more than or equal to zero and less than or equal to one, i.e. that 0??G+?W?1.

Abstract: Systems, methods, and computer-readable media for modeling slug flow. The method includes receiving a fluid flow model comprising a representation of one or more conduits and a multiphase fluid flow therein, and determining a slug birth rate in the multiphase fluid flow. The slug birth rate is determined based at least partially on a difference between a slug front velocity and a slug tail velocity. The method also includes initiating a slug in the fluid flow model based at least partially on the slug birth rate, and displaying data representative of the slug flow in the model.

Abstract: A method of estimating chordal holdup values of gas, oil, and water (?G, ?O, ?W) for tomographic imaging of a three-phase flow through a volume, including: providing an X-ray source for irradiating through said volume and X-ray sensors for discriminating between a first and a second radiation bands, conducting first calibration measurements (IGS, IOS, IWS) of said first radiation band, conducting second calibration measurements (IGH, IOH, IWH) of said second radiation band, arranging a mixture of two or more fluids, irradiating said volume and conducting X-ray measurements (IS, IH) in said radiation bands, establishing a relationship between a function of holdup values f(?G, ?W) of at least gas and water and said X-ray measurements (IS, IH), searching holdup values (?G, ?W) that minimise said function of holdup values f(?G, ?W) under the constraints of the sum of said holdup values is more than or equal to zero and less than or equal to one, i.e. that 0??G+?W?1.

Abstract: An x-ray diffractometry technique finds thickness of multiple layers of non-metallic crystalline material. A rocking curve is windowed to eliminate a main peak. The windowed curve is smoothed. The smoothed curve is subtracted from the windowed curve to yield a difference curve. The difference curve is transformed to make its average value zero and to constrain its endpoints to zero. A Fast Fourier transform is applied to the transformed difference curve. A thickness transform is applied to the result to yield a layer thickness.