Simultaneous fluid flow and fluid density measurements using rotameter and nuclear technology

A method of measuring fluid flow rate in a well borehole wherein the method comprises the steps of:

• (a) directing the fluid flow through a tube vertically positioned in the well borehole and supported by a sonde thereat and wherein the tube has a lower end which receives all the fluid flow of the well borehole thereinto for the tube and an upper end outlet for returning the fluid to the well borehole;
• (b) positioning a float within the tube wherein the float is buoyantly lifted by the flow in the tube and placing in said float a signal emitting source;
• (c) positioning a float position detector comprising two separate detectors positioned at opposite ends of said tube each of which is capable of detecting signals from said signal emitting source to determine the position of the float within the tube;
• and
• (d) determining the volume flow rate of fluid flowing through the tube as a function of float position.

A method of measuring fluid flow in a well borehole which comprises the steps of:

• (a) directing the fluid flow in a well upwardly through a tube having upper and lower ends wherein the tube is vertically positioned in the well borehole;
• (b) positioning a float in the tube wherein the float allows flow thereby within the tube;
• (c) positioning spaced lower and upper detectors near the ends of the tube;
• (d) with said detectors, dynamically detecting the position of the float relative to the detectors;
• and
• (e) determining the volume flow rate of fluid flowing through the tube as a function of float position in the tube.