US4424487A
Expired / Lapsed
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Dispersion coefficient determination
Assignee: Phillips Petroleum Co
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Filing: 1981-06-02
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Granted: 1984-01-03
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Expires: 2001-06-02
Abstract
Abstract Dispersion coefficients of fluids in porous media are determined by NMR spin echo techniques while the fluid is flowing through the porous medium.
Inventors
- 👤 Donald E. Lauffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:36
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01R; G01R33/00; G01R33/20; G01R33/44
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A method for determining the dispersion coefficient of fluid in porous media comprising (a) positioning a sample representative of said porous media in an NMR spectrometer, (b) causing said fluid to flow through said so positioned sample, said fluid being capable of exhibiting a detectable response in an NMR spectrometer measurement, (c) carrying out an NMR spin echo measurement while said fluid is glowing and while said flowing fluid is subjected to a magnetic field gradient and obtaining a spin echo signal, (d) determining the dispersion coefficient from the spin echo signal obtained.
Claim 2
Independent Claim
93 words
A method for determining the dispersion coefficient of fluid in porous media comprising (a) positioning a sample representative of said porous media in an NMR spectrometer, (b) causing said fluid to flow through said so positioned sample, said fluid being capable of exhibiting a detectable response in an NMR spectrometer measurement, (c) carrying out an NMR spin echo measurement while said fluid is glowing and while said flowing fluid is subjected to a magnetic field gradient and obtaining a spin echo signal, (d) determining the dispersion coefficient from the spin echo signal obtained.
Claim 3
Dependent Claim
68 words
A method in accordance with claim 1 wherein said fluid is flowing through said sample in a main direction which is essentially 90° to the main constant magnetic field of the NMR spectrometer and wherein said sample during said spin echo measurement is subjected to a radio frequency electromagnetic pulse generated in a coil surrounding said sample and having a coil axis essentially parallel to said main direction.
Claim 4
Dependent Claim
50 words
A method in accordance with claim 2 wherein during said spin echo measurement said sample is subjected to a further magnetic field generating a gradient in magnetic field strength having a direction essentially parallel to the main magnetic field and wherein the transverse dispersion coefficient of the sample is determined.
Claim 5
Dependent Claim
57 words
A method in accordance with claim 2 wherein during said spin echo measurement said sample is subjected to a further magnetic field generating a gradient in the magnetic field strength having a direction essentially orthogonal to the main magnetic field and parallel to the coil axis and wherein the longitudinal dispersion coefficient of the sample is determined.
Claim 6
Dependent Claim
46 words
A method in accordance with claim 3 wherein a plurality of three 90° pulse spin echo measurements is carried out, wherein the spin echo signal is obtained as a function of the magnetic field gradient and wherein said transverse dispersion coefficient is determined from said function.
Claim 7
Dependent Claim
46 words
A method in accordance with claim 4 wherein a plurality of three 90° pulse spin echo measurements is carried out, wherein the spin echo signal is obtained as a function of said magnetic field gradient and wherein said longitudinal dispersion coefficient is determined from said function.
Claim 8
Independent Claim
105 words
A method for determining the dispersion coefficient of fluid in porous media comprising (a) positioning a sample representative of said porous media in an NMR spectrometer, (b) causing said fluid to flow through said so positioned sample, said fluid being capable of exhibiting a detectable response in an NMR spectrometer measurement, (c) carrying out an NMR spin echo measurement while said fluid is flowing and while said flowing fluid is subjected to a magnetic field gradient and obtaining a spin echo signal, (d) obtaining the spin echo signal as a function of said magnetic field gradient, and (e) determining the dispersion coefficient from said function.
Claim 9
Independent Claim
105 words
A method for determining the dispersion coefficient of fluid in porous media comprising (a) positioning a sample representative of said porous media in an NMR spectrometer, (b) causing said fluid to flow through said so positioned sample, said fluid being capable of exhibiting a detectable response in an NMR spectrometer measurement, (c) carrying out an NMR spin echo measurement while said fluid is flowing and while said flowing fluid is subjected to a magnetic field gradient and obtaining a spin echo signal, (d) obtaining the spin echo signal as a function of said magnetic field gradient, and (e) determining the dispersion coefficient from said function.
Claim 10
Independent Claim
111 words
A method for determining the dispersion coefficient of fluid in porous media comprising (a) positioning a sample representative of said porous media in an NMR spectrometer, (b) causing said fluid to flow through said so positioned sample, said fluid being capable of exhibiting a detectable response in an NMR spectrometer measurement, (c) carrying out an NMR spin echo measurement while said fluid is flowing and while said flowing fluid is subjected to a magnetic field having a constant magnetic field gradient applied and obtaining a spin echo signal, (d) obtaining the spin echo signal as a function of said magnetic field gradient, and (e) determining the dispersion coefficient from said function.
Claim 11
Independent Claim
111 words
A method for determining the dispersion coefficient of fluid in porous media comprising (a) positioning a sample representative of said porous media in an NMR spectrometer, (b) causing said fluid to flow through said so positioned sample, said fluid being capable of exhibiting a detectable response in an NMR spectrometer measurement, (c) carrying out an NMR spin echo measurement while said fluid is flowing and while said flowing fluid is subjected to a magnetic field having a constant magnetic field gradient applied and obtaining a spin echo signal, (d) obtaining the spin echo signal as a function of said magnetic field gradient, and (e) determining the dispersion coefficient from said function.
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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |