| 摘要 |
<p>A method of estimating chordal holdup values of gas, oil and water (formula i) for tomographic imaging of a three-phase flow through a volume, comprising - providing an X-ray source arranged for irradiating through said volume and two or more X-ray sensors arranged for discriminating at least partly between a first and a second radiation bands, - conducting first calibration measurements (formula ii) of said first radiation band of the X-ray sensors for only gas, only oil, and only water present in said volume, respectively, - conducting second calibration measurements (formula iii) of said second radiation band of the X-ray sensors for only gas, only oil, and only water present in said volume, respectively, - arranging a mixture of two or more fluids of gas, oil and water in said volume, - irradiating said volume and conducting X-ray measurements (formula iv) in said first and second radiation bands, establishing a relationship between a function of holdup values (formula v) of at least gas and water and said X-ray measurements (formula iv ) on said mixture in said first and second radiation bands, - searching holdup values (formula vi) that minimise said function of holdup values (formula v) under the constraints of the sum of said holdup values of gas and water is more than or equal to zero and less than or equal to one, i.e. that (formula vii)</p> |
