Fluid flow measuring device and method of manufacturing thereof
AssigneeREM Scientific Enterprises, Inc.
InventorRobert E. Maute
Life of this patent
Estimating the term…
Abstract
In a borehole logging tool, the flow of conductive fluid into or out of a wellbore at the wellbore wall is detected and measured with a sensor loop proximate the borehole inner wall. The sensor loop includes a series of contiguous sensors that act as electromagnetic flowmeters and provide fluid measurements covering the entire circumference of the sensor loop. The sensor loop includes an elastic element that forces the sensor loop outward to maintain pressure along the sensor loop circumference against the interior borehole wall. The sensor loop is designed to lie at a non-perpendicular angle to the wellbore axis, and mechanical arms press the top and bottom of the loop against the borehole inner wall.
Claims33
A fluid flow measuring device, comprising:
- a plurality of resistors disposed in a circular pattern;
- a plurality of electrodes, each electrode coupled between two adjacent resistors;
- a fist coil of wire adapted to generate a magnetic field wound proximate the resistors and electrodes;
- a second coil of wire adapted to generate a magnetic field wound proximate the resistors and electrodes;
- and
- a voltage measuring mechanism electrically coupled between two of the resistors, wherein a flow of conductive fluid is detectable by measuring the voltage.
A fluid flow measuring device, comprising:
- a series-coupled plurality of alternating electrodes and resistors, wherein the electrodes are disposed along a curved loop;
- a magnetic field source, the magnetic field source oriented to generate a magnetic field between adjacent electrodes, the magnetic field substantially orthogonal to an imaginary line intersecting adjacent electrodes;
- and
- a voltage measuring circuit electrically coupled to the plurality of alternating electrodes and resistors, the circuit coupled to measure a voltage difference between adjacent electrodes, the voltage difference representative of a radial flow of conductive fluid substantially orthogonal to both the imaginary line and the magnetic field.
A method of manufacturing a fluid flow measuring device, the method comprising:
- disposing a plurality of electrodes spaced apart on a sensor loop;
- disposing a plurality of resistors on the sensor loop;
- electrically coupling the electrodes and resistors in alternating series;
- disposing a magnetic field source on the sensor loop proximate the electrodes, wherein the magnetic field source is oriented to generate a magnetic field substantially orthogonal to an imaginary line intersecting adjacent electrodes;
- and
- electrically coupling a voltage measuring circuit to the plurality of alternating electrodes and resistors, the circuit coupled to measure a voltage difference between adjacent electrodes, the voltage difference representative of a radial flow of conductive fluid substantially orthogonal to both the imaginary line and the magnetic field.
Dependencies are inferred from the claim text.