GB2614203A - Power-efficient transient electromagnetic evaluation system and method - Google Patents
Power-efficient transient electromagnetic evaluation system and method Download PDFInfo
- Publication number
- GB2614203A GB2614203A GB2305022.2A GB202305022A GB2614203A GB 2614203 A GB2614203 A GB 2614203A GB 202305022 A GB202305022 A GB 202305022A GB 2614203 A GB2614203 A GB 2614203A
- Authority
- GB
- United Kingdom
- Prior art keywords
- conductor coil
- power supply
- state
- coupled
- permanent magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/26—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device
Abstract
A system (400) for performing downhole logging operations includes a conductor coil (406) configured to alternate between producing a magnetic field and measuring a magnetic field induced in a formation, a power supply (402) couplable to the conductor coil (406) for providing an electrical control current to conductor coil (406), and a signal acquisition system (418) couplable to the conductor coil (406). The system (400) further includes a permanent magnet (408) coupled to the conductor coil (406), and a multi-state switch (416) operable in a first state and a second state. In the first state, the conductor coil (416) is coupled to an output of the power supply (402) and decoupled from an input of the signal acquisition system (418). In the second state, the conductor coil (406) is coupled to the input of acquisition electronics (418) and decoupled from the output of the power supply (402).
Claims (20)
1. A system (400) for performing downhole logging operations, the system (400) comprising: a conductor coil (406) configured to alternate between producing a magnetic field and measuring a magnetic field induced in a formation; a power supply (402) couplable to the conductor coil (406) for providing an electrical control current to conductor coil (406); a signal acquisition system (418) couplable to the conductor coil (406); a permanent magnet (408) coupled to the conductor coil (406); a multi-state switch (416) operable in a first state and a second state, where in the first state, the conductor coil (406) is coupled to an output of the power supply (402) and decoupled from an input of the signal acquisition system (418); and wherein in the second state, the conductor coil (406) is coupled to the input of acquisition electronics (418) and decoupled from the output of the power supply (402); and at least one additional electromagnetic sensor (414) detecting an electromagnetic signal caused by eddy currents in the surrounding environment induced by the transient magnetic field.
2. The system (400) of claim 1, further comprising a timer (412) coupled to the multi-state switch (416), the timer (412) activating the multi-state switch (416) to change the states based on a programmed activation rate or a control signal.
3. The system (400) of claim 1, wherein the a control current supplied to the conductor coil (406) from the power supply (402) during the first state of multi-state switch (416) has an amplitude large enough to generate a magnetic field exceeding the permanent magnetâ s existing magnetization.
4. The system (400) of claim 1, wherein a duration of the first state of the multistate switch (416) and the corresponding control current flowing through the conductive coil (406) is shorter than a duration of the second state during which the control current is absent.
5. The system (400) of claim 1, wherein the control current supplied to the conductor coil (406) from the power supply during the first state of the multi-state switch (416) causes the permanent magnet (408) to reverse polarity and induces the transient magnetic field in the surrounding environment.
6. The system (400) of claim 1, wherein the flow of the control current supplied to the conductor coil (406) from the power supply (402) has an opposite direction of flow during each sequential time the multi-state switch (416) is in the first state, thereby sequentially reversing polarity of the permanent magnet (408).
7. The system (400) of claim 1, wherein switching the multi-state switch (416) to the second state upon completion of the first state enables the conductor coil (406) to operate as a magnetic field sensor that records induced voltage by the means of the signal acquisition system (418).
8. The system (400) of claim 1, wherein the at least one additional electromagnetic sensor (414) comprises at least one of a magnetometer, a second conductive coil, an electrode system, a Hall effect sensor, or a giant magnetic resistivity sensor.
9. The system (400) of claim 1, further comprising one or more sensors located around the circumference of a pipe under inspection, wherein the pipe is magnetized by the permanent magnet (408) and the one or more sensors detect magnetic flux leakage from the pipe-
10. The system (400) of claim 1, wherein the permanent magnet (408) has a magnetization strength below the magnetic saturation of a structure in the surrounding environment.
11. The system (400) of claim 1, wherein the permanent magnet (408) has a magnetization strength exceeding the magnetic saturation of a first structure in a surrounding environment and below the magnetic saturation of a second structure in the surrounding environment.
12. A system (400) for performing downhole logging operations, the system comprising: a conductor coil (406); a permanent magnet (408) coupled to the conductor coil (406); a power supply (402) selectively couplable to the conductor coil (406) for providing a current to conductor coil (406); a signal acquisition system ( 18) selectively couplable to the conductor coil (406) for receiving a measurement signal from the conductor coil (406); and a switching device (416) configured to alternating couple the conductor coil (406) to either the power supply (402) or the signal acquisition system (418), wherein when the conductor coil (406) is coupled to the power supply (402), the power supply (402) provides a current through the conductor coil (406) causing the conductor coil (406) to generate a magnetic field; and wherein when the conductor coil (406) is coupled to the signal acquisition system (418), the conductor coil (406) detects a magnetic field induced in a formation.
13. The system (400) of claim 12, further comprising a timer (412) coupled to the switching device (416), the timer (412) controlling the switching device (416) based on a programmed activation rate or a control signal.
14. The system (400) of claim 12, wherein the conductive coil (406) is coupled to the power supply (402) for a shorter duration than the conductive coil (406) is coupled to the signal acquisition system (418).
15. The system (400) of claim 12, wherein the flow current supplied to the conductor coil (406) from the power supply (402) has an opposite direction of flow during each sequential time the conductive coil (406) is coupled to the power supply (402), thereby sequentially reversing polarity of the permanent magnet (408).
16. The system (400) of claim 12, further comprising one or more sensors 32 located around the circumference of a pipe under inspection, wherein the pipe is magnetized by the permanent magnet and the one or more sensors detect magnetic flux leakage from the pipe.
17. A method for evaluating a well comprising: placing an evaluation tool (106) in a wellbore surrounded by a well formation, the evaluation tool (106) comprising a permanent magnet (408), a conductor coil (406), a power supply (402), and a signal acquisition system (418); electrically coupling the conductor coil (406) to the power supply (402), thereby energizing the conductor coil (406) and reversing the polarity of the permanent magnet (408) and generating a transient magnetic field in the well formation; electrically decoupling the conductor coil (406) from the power supply (402); electrically coupling the conductor coil (406) to the signal acquisition system (418), the conductor coil (406) sensing an electromagnetic signal caused by eddy currents in the formation induced by the transient magnetic field; electrically decoupling the conductor coil (406) from the signal acquisition system (418); and electrically coupling the conductor coil (406) to the power supply (402).
18. The method of claim 17, further comprising: controlling switching between coupling the conductor coil (406) to the power supply (402) and the signal acquisition system (418) using a timer (412) programmed based on a predetermined switching schedule.
19. The method of claim 17, wherein the signal acquisition system (418) is 33 coupled to the conductor coil (406) for a longer duration than the power supply (402) is coupled to the conductor coil (406).
20. The method of claim 17, further comprising: placing one or more sensors around the circumference of a structure in the well formation, wherein the structure is magnetized by the permanent magnet (408); and detecting magnetic flux leakage from the structure via the one or more sensors.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17/020,419 US11762120B2 (en) | 2018-11-29 | 2020-09-14 | Power-efficient transient electromagnetic evaluation system and method |
| PCT/US2021/043990 WO2022055633A1 (en) | 2020-09-14 | 2021-07-30 | Power-efficient transient electromagnetic evaluation system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB202305022D0 GB202305022D0 (en) | 2023-05-17 |
| GB2614203A true GB2614203A (en) | 2023-06-28 |
Family
ID=80629785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2305022.2A Pending GB2614203A (en) | 2020-09-14 | 2021-07-30 | Power-efficient transient electromagnetic evaluation system and method |
Country Status (3)
| Country | Link |
|---|---|
| GB (1) | GB2614203A (en) |
| NO (1) | NO20230356A1 (en) |
| WO (1) | WO2022055633A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060202699A1 (en) * | 2005-03-10 | 2006-09-14 | Arcady Reiderman | Magnetic sensor for electromagnetic measurement |
| US20080012569A1 (en) * | 2005-05-21 | 2008-01-17 | Hall David R | Downhole Coils |
| US9903197B2 (en) * | 2009-01-02 | 2018-02-27 | Baker Hughes, A Ge Company, Llc | Reliable wired-pipe data transmission system |
-
2021
- 2021-07-30 NO NO20230356A patent/NO20230356A1/en unknown
- 2021-07-30 GB GB2305022.2A patent/GB2614203A/en active Pending
- 2021-07-30 WO PCT/US2021/043990 patent/WO2022055633A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060202699A1 (en) * | 2005-03-10 | 2006-09-14 | Arcady Reiderman | Magnetic sensor for electromagnetic measurement |
| US20080012569A1 (en) * | 2005-05-21 | 2008-01-17 | Hall David R | Downhole Coils |
| US9903197B2 (en) * | 2009-01-02 | 2018-02-27 | Baker Hughes, A Ge Company, Llc | Reliable wired-pipe data transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022055633A1 (en) | 2022-03-17 |
| GB202305022D0 (en) | 2023-05-17 |
| NO20230356A1 (en) | 2023-03-29 |
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