Systems and methods for monitoring temperature using a magnetostrictive probe
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02K-011/00
E21B-047/06
G01K-007/36
G01K-013/00
H02K-011/26
G01K-011/22
G01F-023/296
G01F-023/24
출원번호
US-0267255
(2014-05-01)
등록번호
US-9702243
(2017-07-11)
발명자
/ 주소
Wang, Ke
Xu, Zhiyue
출원인 / 주소
Baker Hughes Incorporated
대리인 / 주소
Law Offices of Mark L. Berrier
인용정보
피인용 횟수 :
0인용 특허 :
23
초록▼
Systems and methods for monitoring temperature distribution in downhole equipment using magnetostrictive probes. In one embodiment, an ESP motor has a stator with a rotor and shaft rotatably positioned within the stator. Magnetostrictive sensors are positioned within the motor. Each magnetostrictive
Systems and methods for monitoring temperature distribution in downhole equipment using magnetostrictive probes. In one embodiment, an ESP motor has a stator with a rotor and shaft rotatably positioned within the stator. Magnetostrictive sensors are positioned within the motor. Each magnetostrictive sensor has a transducer, a probe, and electronic circuitry coupled to the transducer. The circuitry generates an initial electrical signal that is conveyed to the transducer. The signal passes through one or more coils in the transducer, generating magnetic fields that induce an acoustic signal in the probe. The acoustic signal propagates through the probe and waves are reflected from reflection points in the probe. The transducer senses the reflected acoustic waves and provides corresponding electrical signals to the circuitry, which determines timing intervals associated with the reflected waves and uses this information to determine temperatures at one or more locations in the probe (hence in the monitored equipment).
대표청구항▼
1. An ESP motor comprising: a stator having a bore therethrough;a rotor mounted on a shaft, wherein the rotor and shaft are positioned within the bore of the stator, wherein the rotor and shaft rotate within the bore of the stator; andone or more magnetostrictive sensors positioned within the motor;
1. An ESP motor comprising: a stator having a bore therethrough;a rotor mounted on a shaft, wherein the rotor and shaft are positioned within the bore of the stator, wherein the rotor and shaft rotate within the bore of the stator; andone or more magnetostrictive sensors positioned within the motor;wherein each of the magnetostrictive sensors includes a magnetostrictive transducer, a magnetostrictive probe, and electronic components;wherein the electronic components are configured to generate an initial electrical signal that is conveyed to the transducer;wherein the transducer is configured to generate an initial acoustic signal in the probe responsive to the initial electrical signal;wherein the transducer is configured to sense one or more reflected acoustic signals that are reflected from one or more reflection points in the probe, and to generate, for each of the reflected acoustic signals, an induced electrical signal corresponding to the reflected acoustic signal;wherein the circuitry is configured to determine timing intervals between one or more pairs of the initial and induced electrical signals and to determine temperatures at one or more locations in the probe and corresponding locations in the motor based on the timing intervals,wherein at least a first one of the magnetostrictive sensors is positioned so that the corresponding probe extends into a hollow interior of the shaft, wherein the probe remains stationary while the shaft rotates within the bore of the stator. 2. The ESP motor of claim 1, wherein at least one of the magnetostrictive sensors is positioned so that the corresponding probe is within one of a plurality of slots in the stator adjacent to one or more windings of magnet wire that are positioned in the slot. 3. The ESP motor of claim 1, wherein at least one of the magnetostrictive sensors is positioned so that the corresponding probe extends between a housing of the stator and a plurality of stator laminations. 4. The ESP motor of claim 1, wherein at least one of the magnetostrictive sensors is positioned so that the corresponding probe is embedded into a plurality of stator laminations. 5. The ESP motor of claim 1, wherein: at least a second one of the magnetostrictive sensors is positioned so that the corresponding probe is within one of a plurality of slots in the stator adjacent to one or more windings of magnet wire that are positioned in the slot;at least a third one of the magnetostrictive sensors is positioned so that the corresponding probe extends between a housing of the stator and a plurality of stator laminations; andat least a fourth one of the magnetostrictive sensors is positioned so that the corresponding probe is embedded into a plurality of stator laminations. 6. The ESP motor of claim 1, wherein at least one of the magnetostrictive sensors is configured to determine a temperature profile along a length of the corresponding probe, wherein the profile includes temperatures at a plurality of locations in the probe. 7. The ESP motor of claim 6, wherein the at least one of the magnetostrictive sensors is configured to determine one or more individual temperatures at specific locations of the probe in addition to determining the temperature profile along a length of the probe. 8. The ESP motor of claim 1, wherein the probe of at least one of the magnetostrictive sensors is configured to sense temperatures over a complex surface at non-colinear set of locations. 9. The ESP motor of claim 1, wherein the probe of at least one of the magnetostrictive sensors comprises a ferromagnetic material. 10. The ESP motor of claim 1, wherein the one or more reflection points in the probe of at least one of the magnetostrictive sensors comprise one or more structures selected from the group comprising triangular notches, rectangular notches, circumferentially extending notches and welding joints. 11. The ESP motor of claim 1, wherein the magnetostrictive transducer of each of the magnetostrictive sensors includes at least one magnet and a coil, wherein the circuitry is coupled to the coil, wherein the initial electrical signal induces a magnetic field in the coil and thereby creates the initial acoustic signal in the probe, and wherein the reflected acoustic waves create magnetic fields that generate the induced electrical signals. 12. The ESP motor of claim 11, wherein in at least one of the transducers, a proximal end of the probe is positioned within an interior of the coil near an axis of the coil, and wherein the at least one magnet includes a first magnet which is exterior to the coil and adjacent to a first side of the coil. 13. The ESP motor of claim 11, wherein in at least one of the transducers, a proximal end of the probe is positioned within an interior of the coil near an axis of the coil, and wherein the at least one magnet includes a first magnet which is exterior to the coil and adjacent to a first side of the coil and a second magnet which is exterior to the coil and adjacent to a second side of the coil opposite the first side. 14. The ESP motor of claim 11, wherein in at least one of the transducers, a proximal end of the probe is positioned within an interior of the coil near an axis of the coil, and wherein the at least one magnet includes a first magnet which is interior to the coil and substantially coaxial with the coil. 15. The ESP motor of claim 11, wherein in at least one of the transducers, a proximal end of the probe is positioned within an interior of the coil near an axis of the coil, and wherein the coil and the proximal end of the probe are embedded in the magnet. 16. The ESP motor of claim 1, wherein for each of the magnetostrictive sensors, the circuitry is configured to store or communicate data to surface equipment, and wherein the circuitry is configured to determine the temperature between each pair of reflection points by identifying a relative time shift of each reflected signal from the reflection points or a distal end of the probe and converting the relative time shift to a corresponding temperature reading based on a relationship of time shift and temperature for the probe. 17. A method for measuring temperatures in a motor, the method comprising: positioning one or more magnetostrictive sensors within a motor,wherein the motor has a stator and a rotor, wherein the rotor is mounted on a shaft and positioned within the bore of the stator, wherein the rotor and shaft rotate within the bore of the stator, wherein at least a first one of the magnetostrictive sensors is positioned so that a corresponding probe extends into a hollow interior of the shaft, wherein the probe remains stationary while the shaft rotates within the bore of the stator; positioning the motor in a well; in each of the magnetostrictive sensors, generating an initial electrical signal in an electronic circuit;conveying the initial electrical signal to an magnetostrictive transducer;generating, using the magnetostrictive transducer, an initial acoustic signal in the probe corresponding to the initial electrical signal;reflecting, from each of one or more reflection points in the probe, a corresponding reflected acoustic signal;sensing, in the transducer, each of the reflected acoustic signals;generating, in the magnetostrictive transducer, an induced electrical signal corresponding to each of the reflected acoustic signals;conveying the induced electrical signals to the circuit;determining timing intervals between one or more pairs of the initial and induced electrical signals; anddetermining temperatures at one or more locations in the probe and corresponding locations in the motor based on the timing intervals.
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