US4564811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
RF Core analyzing means and method
Assignee: Texaco Inc
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Filing: 1983-08-01
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Granted: 1986-01-14
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Expires: 2003-08-01
Abstract
Abstract A core analyzer includes a test cell containing a core of earthen material. The core has a length suitable for monitoring fluid moving through the core. Apparatus provides at least two fluids to the test cell in such a manner that a first fluid fills the core in the test cell and a second fluid displaces at least a portion of the first fluid. Other apparatus uses nuclear magnetic resonance to monitor the saturation of the core with the first fluid and to monitor the displacing movement of the second fluid.
Inventors
- 👤 Robert N. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:36
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/28; G01R33/30; Y; Y10; Y10T; Y10T436/00; Y10T436/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
97 words
A core analyzer comprising: test cell means for containing a core of earthen material, said core having a length suitable for monitoring of fluid moving through the core; means for providing at least two fluids to the test cell means in such a manner that a first fluid fills the core in the test cell means and a second fluid displaces at least a portion of the first fluid, and means for using nuclear magnetic resonance to monitor the saturation of the core with the first fluid and to monitor the displacing movement of the second fluid.
Claim 2
Dependent Claim
97 words
A core analyzer comprising: test cell means for containing a core of earthen material, said core having a length suitable for monitoring of fluid moving through the core; means for providing at least two fluids to the test cell means in such a manner that a first fluid fills the core in the test cell means and a second fluid displaces at least a portion of the first fluid, and means for using nuclear magnetic resonance to monitor the saturation of the core with the first fluid and to monitor the displacing movement of the second fluid.
Claim 3
Dependent Claim
79 words
A core analyzer as described in claim 1 in which the nuclear magnetic resonance means includes; an electromagnet having poles arranged with the test cell means so that a portion of the test cell means is between the poles of the electromagnet, a coil encircling a portion of the test cell means between the poles, means for energizing the coil with pulses of RF energy, and means for monitoring the decay characteristics of the RF energy after each pulse.
Claim 4
Dependent Claim
36 words
A core analyzer as described in claim 2 further comprising: moving means for changing the spatial relationship between the electromagnet, the coil and the test cell means so that readings may be made for each arrangement.
Claim 5
Dependent Claim
30 words
A core analyzer as described in claim 3 in which the electromagnet and the coil remain stationary while the test cell means is moved to achieve the changing spatial relationship.
Claim 6
Dependent Claim
83 words
A core analyzer as described in claim 4 in which the moving means includes; a drive screw to which the test cell means is fixed in a manner so that as the drive screw rotates the test cell will move in a linear direction, and stepper motor means mechanically connected to the drive screw for turning the drive screw through a predetermined rotation for each step of the stepper motor means so that test cell 9 moves a predetermined distance through the coil.
Claim 7
Dependent Claim
94 words
An analyzer as described in claim 5 in which the pulse means includes; a computer, a source of RF energy, pulse programming means receiving the RF energy and connected and controlled by the computer to provide the RF energy and a pulse signal, gated RF amplifier means connected to the computer and to the pulse programming means for providing the pulses of RF energy in accordance with the RF energy and the pulse signal from the pulse programmer means and providing a signal back to the computer indicating occurrences of the pulses of energy.
Claim 8
Dependent Claim
69 words
An analyzer as described in claim 6 in which the monitoring means includes; RF receiving means connected to one end of the coil and to the pulse programming means for receiving a reference RF signal from the pulse programming means and the current passing through the coil, and means for providing a readout in accordance with the reference RF signal and the current received by the RF receiving means.
Claim 9
Dependent Claim
83 words
A flood core analyzing method comprising the steps of: containing a core of earthen material in a test cell, said core having a length suitable for monitoring of fluid moving through the core; filling the core with a first fluid in the test cell, displacing at least a portion of the first fluid with a second fluid, and using nuclear magnetic resonance to monitor the saturation of the core with the first fluid and to monitor the displacing movement of the second fluid.
Claim 10
Dependent Claim
83 words
A flood core analyzing method comprising the steps of: containing a core of earthen material in a test cell, said core having a length suitable for monitoring of fluid moving through the core; filling the core with a first fluid in the test cell, displacing at least a portion of the first fluid with a second fluid, and using nuclear magnetic resonance to monitor the saturation of the core with the first fluid and to monitor the displacing movement of the second fluid.
Claim 11
Dependent Claim
73 words
A method as described in claim 8 in which the nuclear magnetic resonance use step includes; arranging an electromagnet having poles with the test cell so that a portion of the test cell is between the poles of the electromagnet, encircling a portion of the test cell between the poles with a coil, energizing the coil with pulses of RF energy, and monitoring the decay characteristics of the RF energy after each pulse.
Claim 12
Dependent Claim
35 words
A method as described in claim 9 further comprising the step of: changing the spatial relationship between the electromagnet, the coil and the test cell so that a reading may be made for each arrangement.
Claim 13
Dependent Claim
32 words
A method as described in claim 10 in which during the changing step the electromagnet and the coil remain stationary while the test cell is moved to achieve the changing spatial relationship.
Claim 14
Dependent Claim
80 words
A method as described in claim 11 in which the changing step includes; rotating a drive screw to which the test cell is fixed in a manner so that as the drive screw rotates the test cell will move in a linear direction, and turning the drive screw with a stepper motor, mechanically connected to the drive screw, through a predetermined rotation for each step of the stepper motor so that test cell moves a predetermined distance through the coil.
Claim 15
Dependent Claim
46 words
A method as described in claim 12 in which the monitoring step includes; receiving a reference RF signal from the pulse programming means, receiving the current passing through the coil, and providing a readout in accordance with the received reference RF signal and the received current.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |