Apparatus and method for fluid flow measurement with sensor shielding
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-047/10
G01F-001/58
G01F-001/56
출원번호
UP-0574330
(2004-09-30)
등록번호
US-7574907
(2009-08-31)
국제출원번호
PCT/US04/032129
(2004-09-30)
§371/§102 date
20060331
(20060331)
국제공개번호
WO05/033633
(2005-04-14)
발명자
/ 주소
Maute, Robert E.
출원인 / 주소
REM Scientific Enterprises, Inc.
대리인 / 주소
Slater & Matsil, L.L.P.
인용정보
피인용 횟수 :
12인용 특허 :
25
초록▼
Methods and apparatuses for detecting radial flows of conductive fluid are provided. In an embodiment of the present invention, shields are used to prevent or reduce circulating electrical currents from causing a voltage difference that would adversely affect the measured voltage difference between
Methods and apparatuses for detecting radial flows of conductive fluid are provided. In an embodiment of the present invention, shields are used to prevent or reduce circulating electrical currents from causing a voltage difference that would adversely affect the measured voltage difference between two adjacent electrodes. The shields may be a conduit through which conductive fluid may flow. Groups of sensors, e.g., two or more, may be placed within the shield. The shields may have any cross-section shape. Generally, once the circulating electrical current flow between the electrode pairs is substantially reduced or eliminated, only the voltage difference from the localized induced electric field remains. This way, a true induced voltage may be measured, and thus an accurate value for the fluid velocity may be determined.
대표청구항▼
What is claimed is: 1. A logging tool for a borehole, the borehole having an interior wall, the logging tool comprising: a tool body adapted to be inserted into the borehole; a sensing device coupled to the tool body, the sensing device adapted to detect radial flow of conductive fluid entering or
What is claimed is: 1. A logging tool for a borehole, the borehole having an interior wall, the logging tool comprising: a tool body adapted to be inserted into the borehole; a sensing device coupled to the tool body, the sensing device adapted to detect radial flow of conductive fluid entering or leaving the borehole interior wall, the sensing device being adapted to detect the conductive fluid flow adjacent the borehole interior wall; pairs of voltage sensing electrodes disposed along the sensing device; and shields interposed between each of the pairs of voltage sensing electrodes, wherein the shields isolate each of the pairs of voltage sensing electrodes from ambient electrical current flow between the pairs of voltage sensing electrodes. 2. The logging tool of claim 1, wherein the shields are interconnected. 3. The logging tool of claim 1, wherein the shields comprise a conduit through which fluid may flow. 4. The logging tool of claim 1, wherein the voltage sensing electrodes comprise a point electrode. 5. The logging tool of claim 1, wherein the voltage sensing electrodes comprise a longitudinal electrode. 6. A logging tool for a borehole, the borehole having an interior wall, the logging tool comprising: a tool body adapted to be inserted into the borehole; a sensing device coupled to the tool body, the sensing device adapted to detect radial flow of conductive fluid entering or leaving the borehole interior wall, the sensing device being adapted to detect the conductive fluid flow adjacent the borehole interior wall; shields disposed along the sensing device; and voltage sensing electrodes disposed on the interior surfaces of the shields, wherein the voltage sensing electrodes substantially cover opposing sides of the shields. 7. An inspection tool for a casing, the casing having an interior wall, the inspection tool comprising: a tool body adapted to be inserted into the casing; an electromagnetic sensing device coupled to the tool body, the electromagnetic sensing device having a plurality of electrodes positioned substantially equidistance from the interior wall and having a plurality of shields, each shield comprising a conduit through which fluid may flow and having a plurality of the electrodes therein; and a magnetic field generator coupled to the tool body, the magnetic field generator adapted to generate a magnetic field substantially perpendicular to an imaginary line between two adjacent electrodes; wherein the electromagnetic sensing device is adapted to measure an induced voltage caused by an inflow or outflow of conductive fluid through the interior wall of the casing. 8. The inspection tool according to claim 7, wherein the magnetic field is an alternating magnetic field. 9. The inspection tool according to claim 7, wherein the electromagnetic sensing device further comprises: a plurality of resistors, at least one resistor being coupled between two adjacent electrodes; and a voltage measuring mechanism electrically coupled between two of the resistors. 10. The inspection tool according to claim 7, wherein the magnetic field generator comprises a first coil and a second coil. 11. The inspection tool according to claim 7, wherein the electromagnetic sensing device is coupled to the tool body at a loop high point and a loop low point, the loop high point and loop low point being about 180 degrees apart along the electromagnetic sensing device. 12. The inspection tool according to claim 7, wherein the electromagnetic sensing device is relatively insensitive to a flow of conductive fluid along a longitudinal axis of the casing. 13. The inspection tool according to claim 7, wherein the electromagnetic sensing device comprises a sensor loop, the sensor loop being adapted to exert outward pressure to maintain the sensor near the interior wall of the casing while the tool traverses the casing. 14. The inspection tool according to claim 13, wherein the sensor loop includes a spring disposed within the sensor loop to exert outward pressure. 15. The inspection tool according to claim 13, wherein the sensor loop is a continuous ring, wherein an inflow or outflow of conductive fluid is detectable along the circumference of the sensor loop. 16. The inspection tool according to claim 13, wherein the magnetic field generator comprises: a first coil of wire adapted to generate a magnetic field proximate the sensor loop; a second coil of wire adapted to generate a magnetic field proximate the sensor loop; a ferromagnetic material disposed between the two coils; and an alternating current generator coupled to the first coil and the second coil. 17. An inspection tool for detecting a radial flow of conductive fluid through a casing, the inspection tool comprising: a tool body adapted to be inserted into the casing; an electromagnetic sensing device coupled to the tool body, the electromagnetic sensing device having a plurality of electrodes and a plurality of shields, each shield having a plurality of electrodes therein; and a magnetic field generator adapted to generate a magnetic field substantially perpendicular to the imaginary line between two adjacent electrodes; wherein the plurality of electrodes are oriented to detect the radial flow of conductive fluid through the casing. 18. The inspection tool according to claim 17, wherein the magnetic field generator generates an alternating magnetic field. 19. The inspection tool according to claim 17, wherein the electromagnetic sensing device further comprises: a plurality of resistors, at least one resistor being coupled between two adjacent electrodes; and a voltage measuring mechanism electrically coupled between two of the resistors. 20. The inspection tool according to claim 17, wherein the magnetic field generator comprises a first coil and a second coil. 21. The inspection tool according to claim 17, wherein the electromagnetic sensing device is coupled to the tool body at a loop high point and a loop low point, the loop high point and loop low point being about 180 degrees apart along the electromagnetic sensing device. 22. The inspection tool according to claim 17, wherein the electromagnetic sensing device is relatively insensitive to a flow of conductive fluid along a longitudinal axis of the casing. 23. The inspection tool according to claim 17, wherein the electromagnetic sensing device comprises a sensor loop, the sensor loop being adapted to exert outward pressure to maintain the sensor near the casing interior wall while the tool traverses the casing. 24. The inspection tool according to claim 23, wherein the sensor loop includes a spring disposed within the sensor loop to exert outward pressure. 25. The inspection tool according to claim 23, wherein the sensor loop is a continuous ring, wherein an inflow or outflow of conductive fluid is detectable along the circumference of the sensor loop. 26. The inspection tool according to claim 23, wherein the magnetic field generator comprises: a first coil of wire adapted to generate a magnetic field proximate the sensor loop; a second coil of wire adapted to generate a magnetic field proximate the sensor loop; a ferromagnetic material disposed between the two coils; and an alternating current generator coupled to the first coil and the second coil.
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이 특허에 인용된 특허 (25)
Schmoock Roy F. (Yardley PA), Capacitance-type electrode assemblies for electromagnetic flowmeter.
McHale Edward J. (Medfield MA) Hussain Yousif A. (Horley GB2) Sanderson Michael L. (Stockport GB2) Hemp John (Cranfield GB2), Capacitively-coupled magnetic flowmeter.
Ketelsen Broder (Asternweg 15 D-3405 Rosdorf 9 DEX) Ketelsen Andres (Asternweg 15 D-3405 Rosdorf 9 DEX), Device for inductively measuring the state of a stream of electrically conductive liquid.
Hamby Jimmie W. (Knoxville TN) Pearson Hubert S. (Knoxville TN) Waldrop William R. (Powell TN) Warren Donald E. (Powell TN) Young Steven C. (Oak Ridge TN), Electromagnetic borehole flowmeter system.
Hamby Jimmie W. (Knoxville TN) Pearson Hubert S. (Knoxville TN) Waldrop William R. (Powell TN) Warren Donald E. (Powell TN) Young Steven C. (Oak Ridge TN), Electromagnetic borehole flowmeter system.
Codazzi Daniel (St Etienne FRX) Mioque Jean-Yves (St Etienne FRX) Montaron Bernard (St Priest en Jarez FRX), Electromagnetic flowmeter for conductive or dielectric fluids and its applications in particular oilfield.
Mannherz Elmer D. (Southampton PA) Schmoock Roy F. (Yardley PA) Shauger Herbert A. (Doylestown PA), Electromagnetic flowmeter with triangular flux drive.
Paap Hans J. (Houston TX) Richter ; Jr. Albert P. (Houston TX) Peelman Harold E. (Houston TX) Arnold Dan M. (Houston TX) Scott Hubert D. (Houston TX), Method and apparatus for measuring underground fluid flow characteristics.
Maute Robert E. (Richardson TX) Thompson Laird B. (Dallas TX) Bednarczyk Adam (Carrolton TX) Symmons David (Dallas TX), Method of monitoring fluids entering a wellbore.
Lucas, Gary P.; Leeungculsatien, Teerachai, Electromagnetic flow meter and method for monitoring fluid flow of a conducting fluid having either a uniform or a non-uniform flow profile.
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