Patent US4009434A successfully refreshed from Google Patents.
US4009434A
Expired / Lapsed
US
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Dielectric induction logging system for obtaining water and residual oil saturation of earth formations
Assignee: Texaco Inc
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Filing: 1974-12-09
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Granted: 1977-02-22
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Expires: 1994-12-09
Abstract
Abstract Radio frequency electromagnetic fields are used to excite earth formations in the vicinity of a well borehole. The total field amplitude at a single coil receiver and at a dual coil receiver are detected and signals representative thereof are combined according to a predetermined relationship to obtain the relative permittivity and resistivity of the earth formations. By combining the measured permittivity with porosity measurements from another source according to predetermined relationships, the water saturation S w and residual oil saturation ROS may be determined and logged as a function of borehole depth.
Inventors
- 👤 Philip F. McKinlay
- 👤 Richard A. Meador
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:43
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/30; Y; Y02; Y02A; Y02A90/00; Y02A90/30
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
141 words
A method for determining the characteristics of earth formations in the vicinity of a well borehole comprising the steps of: generating, in a well borehole, a radio frequency electromagnetic field in the frequency range from 10 to 60 megahertz; detecting, at a first spaced distance in the borehole, the total field amplitude of the electromagnetic field at said generated frequency this amplitude being influenced by earth formation materials at a first effective depth of investigation; detecting, at a second spaced distance in the borehole, the total field amplitude at said generated frequency this amplitude being influenced by earth formation materials at a second, different, effective depth of investigation; and combining said total field amplitude measurements having different effective depths of investigation according to a predetermined relationship to derive an indication of the earth formation conductivity and permittivity at said generated frequency.
Claim 2
Independent Claim
141 words
A method for determining the characteristics of earth formations in the vicinity of a well borehole comprising the steps of: generating, in a well borehole, a radio frequency electromagnetic field in the frequency range from 10 to 60 megahertz; detecting, at a first spaced distance in the borehole, the total field amplitude of the electromagnetic field at said generated frequency this amplitude being influenced by earth formation materials at a first effective depth of investigation; detecting, at a second spaced distance in the borehole, the total field amplitude at said generated frequency this amplitude being influenced by earth formation materials at a second, different, effective depth of investigation; and combining said total field amplitude measurements having different effective depths of investigation according to a predetermined relationship to derive an indication of the earth formation conductivity and permittivity at said generated frequency.
Claim 3
Dependent Claim
52 words
The method of claim 1 and further including the steps of: determining the porosity of the earth formations in the vicinity of the borehole; and combining said porosity determination and said permittivity indication according to a predetermined relationship to derive an indication of the water saturation S w of the earth formations.
Claim 4
Dependent Claim
36 words
The method of claim 2 wherein all of said steps are performed repetitively at a plurality of depths in the borehole and said conductivity, permittivity, and water saturation are recorded as a function of borehole depth.
Claim 5
Dependent Claim
52 words
The method of claim 1 and further including the steps of: determining the porosity of the earth formations in the vicinity of the borehole; and combining said porosity determination and said permittivity indication according to a predetermined relationship to derive an indication of the residual oil saturation ROS of the earth formations.
Claim 6
Dependent Claim
37 words
A method of claim 4 wherein all of said steps are performed repetitively at a plurality of depths in the borehole and said conductivity, permittivity and residual oil saturation are recorded as a function of borehole depth.
Claim 7
Dependent Claim
81 words
The method of claim 1 and further including the steps of: determining the porosity of the earth formations in the vicinity of the borehole; combining said porosity determination and said permittivity indication according to a first predetermined relationship to derive an indication of the water saturation S w of the earth formations; and combining said porosity determination and said permittivity indication according to a second predetermined relationship to derive an indication of the residual oil saturation ROS of the earth formations.
Claim 8
Dependent Claim
42 words
The method of claim 6 wherein all of said steps are performed repetitively at a plurality of depths in the borehole and said conductivity, permittivity, water saturation S w and residual oil saturation ROS are recorded as a function of borehole depth.
Claim 9
Dependent Claim
37 words
The method of claim 1 wherein the step of detecting the total field amplitude of said electromagentic field at said first spaced distance is performed by detecting said total field amplitude with a dual coil detecting means.
Claim 10
Dependent Claim
36 words
The method of claim 8 wherein the step of detecting the total field amplitude of said electromagnetic field amplitude of said electromagnetic field at said second spaced distance is performed with a single coil detecting means.
Claim 11
Dependent Claim
41 words
The method of claim 9 wherein said predetermined relationship used to derive an indication of the conductivity and permittivity of the earth formations comprises a predetermined calibrated functional relationship between the response of said single and said dual coil receiving means.
Claim 12
Independent Claim
120 words
A method for determining the characteristics of earth formations in the vicinity of a well borehole, comprising the steps of: deriving in a well borehole a first signal indicative of a function of earth formation conductivity and permittivity at a first effective depth of investigation into earth formations at a radio frequency in the range of 10 to 60 megahertz; deriving in a well borehole a second signal indicative of a function of earth formation conductivity and permittivity at a second effective depth of investigation at the same radio frequency used in deriving said first signal; and combining said first and second signals according to a predetermined relationship to derive indications of the conductivity and permittivity of the earth formations.
Claim 13
Independent Claim
120 words
A method for determining the characteristics of earth formations in the vicinity of a well borehole, comprising the steps of: deriving in a well borehole a first signal indicative of a function of earth formation conductivity and permittivity at a first effective depth of investigation into earth formations at a radio frequency in the range of 10 to 60 megahertz; deriving in a well borehole a second signal indicative of a function of earth formation conductivity and permittivity at a second effective depth of investigation at the same radio frequency used in deriving said first signal; and combining said first and second signals according to a predetermined relationship to derive indications of the conductivity and permittivity of the earth formations.
Claim 14
Dependent Claim
54 words
The method of claim 11 and further including the steps of: deriving an indication of the porosity of earth formations in the vicinity of the borehole; and combining said porosity indication and said permittivity indication according to a predetermined relationship to dervie an indication of the water saturation S w of the earth formations.
Claim 15
Dependent Claim
36 words
The method of claim 12 wherein all of said steps are performed repetitively at a plurality of depths in the borehole and said conductivity, permittivity and water saturation are recorded as a function of borehole depth.
Claim 16
Dependent Claim
54 words
The method of claim 11 and further including the steps of: deriving an indication of the porosity of the earth formations in the vicinity of the borehole; combining said porosity indication and sai permittivity indication according to a predetermined relationship to derive an indication of the residual oil saturation ROS of the earth formations.
Claim 17
Dependent Claim
37 words
The method of claim 14 wherein all of said steps ae performed repetitively at a plurality of depths in the borehole and said conductivity, permittivity and residual oil saturation are recorded as a function of borehole depth.
Claim 18
Dependent Claim
82 words
The method of claim 11 and further including the steps of: deriving an indication of the porosity of earth formations in the vicinity of the borehole; combining said porosity indication and said permittivity indication according to a first predetermined relationship to derive an indication of water saturation S w of the earth formations; and combining said porosity indication and said permittivity indication according to a second predetermined relationship to derive an indication of the residual oil saturation ROS of the earth formations.
Claim 19
Dependent Claim
44 words
The method of claim 16 wherein all of said steps are performed repetitively at a plurality of depths in the borehole and said indications of conductivity, permittivity, water saturation S w and residual oil saturation ROS are recorded as a function of borehole depth.
References Cited (Backward Citations)
SU272450A1
Cited
US3086168A
Cited
US3075142A
Cited
US3259836A
Cited
US3166708A
Cited
US3551797A
Cited
US3849721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |