초록 ▼

A method and a device for measuring the qualities of a fluid including at least two liquids, the two liquids having at least one characteristic intrinsic factor relative to microwaves for a given frequency, such as the loss factor. The characteristic of the fluid is measured by a microwave flux for

A method and a device for measuring the qualities of a fluid including at least two liquids, the two liquids having at least one characteristic intrinsic factor relative to microwaves for a given frequency, such as the loss factor. The characteristic of the fluid is measured by a microwave flux for at least two different microwave frequencies, and, with the values of the factors of the intrinsic characteristics of each of the fluids at the two frequencies being known, the respective quantities of the two liquids are determined. The invention applies in particular to measuring the concentrations and flowrates of various phases in a multiphase fluid such as a petroleum effluent having an aqueous phase.

대표청구항 ▼

A method of determining a quality of a fluid moving in a first direction within a tube means of known cross-section, the fluid including a first liquid and a second liquid, each liquid having a frequency-dependent intrinsic characteristic response to microwave energy, said method comprising the step

A method of determining a quality of a fluid moving in a first direction within a tube means of known cross-section, the fluid including a first liquid and a second liquid, each liquid having a frequency-dependent intrinsic characteristic response to microwave energy, said method comprising the steps of: (a) passing microwave energy of a first frequency through the fluid-containing tube means in a second direction not perpendicular to the first direction, the first frequency being a frequency for which the value of the intrinsic characteristic of the first liquid is large in comparison to the value of the intrinsic characteristic of the second liquid and for which the value of the intrinsic characteristic of the tube means is known; (b) determining the value of the intrinsic characteristic of the microwave energy of the first frequency after passage thereof through the fluid-containing tube means; (c) determining the change in frequency of the microwave energy of the first frequency after passage thereof through the fluid-containing tube means; (d) passing microwave energy of a second frequency through the fluid-containing tube means in the second direction, the second frequency being a frequency for which the difference between the value of the intrinsic characteristic of the first liquid and the value of the intrinsic characteristic of the second liquid is small and for which the value of the intrinsic characteristic of the tube means is known; (e) determining the value of the intrinsic characteristic of the microwave energy of the second frequency after passage thereof through the fluid-containing tube means; (f) determining the change in frequency of the microwave energy of the second frequency after passage thereof through the fluid-containing tube means; (g) determining the cross-section of the first liquid within the tube means from the known value of the intrinsic characteristic of the tube means to the microwave energy of the first frequency and the result of step (b); (h) determining the cross-section of the combined first and second liquids within the tube means from the known value of the intrinsic characteristic of the tube means to the microwave energy of the second frequency and the result of step (e); (i) determining the velocity of the first liquid within the tube means from the result of step (c); (j) determining the relationship between the velocity of the first liquid and the velocity of the second liquid within the tube means from the result of step (f); (k) determining the cross-section of the second liquid within the tube means from the results of steps (g) and (h); (l) determining the velocity of the second liquid within the tube means from the results of steps (i) and (j); (m) determining the volume flow rate of the first liquid within the tube means from the results of steps (g) and (i); and (n) determining the volume flow rate of the second liquid within the tube means from the results of steps (k) and (l).