Patent US4745555A successfully refreshed from Google Patents.
Patent US3696091A successfully refreshed from Google Patents.
US4432077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Determination of formation permeability from a long-spaced acoustic log
Assignee: Mobil Oil AS
•
Filing: 1981-01-02
•
Granted: 1984-02-14
•
Expires: 2001-01-02
Abstract
Abstract Disclosed is a method for determining the permeability of a formation which includes the steps of traversing a bore-hole with a tool having a means for transmitting low frequency acoustic energy. The transmitting means is pulsed and the acoustic energy is detected by a first wide band receiver having a frequency response of between at least 0.1k hertz and 30k hertz. The receiver is coupled to the transmitting means only by means of a cable which has a length exceeding about 5 feet and preferably a length of about 15 feet. The amplitude of tube waves detected by the receiver is determined at a plurality of locations in the bore-hole. The change of amplitude in tube waves at various of these locations provides a measure of permeability. The receiver employed preferably comprises a cylinder of piezoelectric material having end plates at the ends of the cylinder and a passageway through one of the end plates which transmits ambient but not dynamic pressure changes.
Inventors
- 👤 Khalid A. Alhilali
- 👤 Joseph Zemanek, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:09
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/40; G01V1/44
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
110 words
A method of determining the permeability of a formation comprising: traversing a bore-hole with a tool having a means for transmitting low-frequency acoustic energy; periodically pulsing said transmitting means; detecting said acoustic energy at a first receiver having a frequency response under bore-hole conditions of between 0.1k Hz and 30k Hz, said receiver being coupled to said transmitting means by a cable having a length exceeding about five feet; determining the amplitude of tube waves detected by said receiver at a plurality of locations in said borehole; and, producing a log of values related to said determined tube wave amplitude and correlated with permeability values for said plurality of locations.
Claim 2
Independent Claim
110 words
A method of determining the permeability of a formation comprising: traversing a bore-hole with a tool having a means for transmitting low-frequency acoustic energy; periodically pulsing said transmitting means; detecting said acoustic energy at a first receiver having a frequency response under bore-hole conditions of between 0.1k Hz and 30k Hz, said receiver being coupled to said transmitting means by a cable having a length exceeding about five feet; determining the amplitude of tube waves detected by said receiver at a plurality of locations in said borehole; and, producing a log of values related to said determined tube wave amplitude and correlated with permeability values for said plurality of locations.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said detecting is accomplished by said first receiver at a distance of about 15 feet from said transmitting means.
Claim 4
Dependent Claim
56 words
The method of claim 1, wherein said log of values is a log of determined tube wave amplitudes, said method further comprising the step of: observing a change in amplitude of said recorded tube waves from one of said plurality to another of said plurality of locations in said bore-hole as a change in formation permeability.
Claim 5
Dependent Claim
29 words
The method of claim 1 wherein said determining is accomplished by measuring the maximum peak to trough amplitude of said tube waves at each of said plurality of locations.
Claim 6
Dependent Claim
64 words
The method of claim 2 further comprising the step of: detecting said acoustic energy at a distance of about 20 feet from said transmitting means with a second receiver having said frequency response, and wherein said determining step includes the determination of the amplitude of tube waves detected by both said first and said second receivers at said plurality of locations in said bore-hole.
Claim 7
Dependent Claim
42 words
The method of claim 5 further including the step of: determining a first ratio of tube wave amplitude detected by said first receiver to tube wave amplitude detected by said second receiver at each of said plurality of locations in said bore-hole.
Claim 8
Dependent Claim
65 words
The method of claim 6 further comprising the step of: detecting said acoustic energy at a distance of about 25 feet from said transmitting means with a third receiver having said frequency response and wherein said determining step includes the determination of the amplitude of tube waves detected by said first, said second and said third receivers at a plurality of locations in said bore-hole.
Claim 9
Dependent Claim
42 words
The method of claim 7 further comprising the step of: determining a second ratio of tube wave amplitude detected by said second receiver to tube wave amplitude detected by said third receiver at each of said plurality of locations in said bore-hole.
Claim 10
Independent Claim
150 words
A method of determining the permeability of a formation comprising: traversing a bore-hole with a tool having a means for transmitting acoustic energy from at least 1k Hz to 20k Hz; pulsing said transmitting means; detecting said acoustic energy at a first receiver of a type having a cylinder of piezoelectric material with end plates sealing both ends of said cylinder and a passageway through one of said end plates which transmits ambient pressure changes, but not dynamic pressure changes, said receiver having a frequency response between 0.1k Hz and 30k Hz, said receiver being coupled to said transmitting means by a cable having a length exceeding 5 feet; determining the amplitude of tube waves detected by said receiver at a plurality of locations in said bore-hole; and, producing a log of values related to said determined tube wave amplitude and correlated with permeability values for said plurality of locations.
Claim 11
Independent Claim
150 words
A method of determining the permeability of a formation comprising: traversing a bore-hole with a tool having a means for transmitting acoustic energy from at least 1k Hz to 20k Hz; pulsing said transmitting means; detecting said acoustic energy at a first receiver of a type having a cylinder of piezoelectric material with end plates sealing both ends of said cylinder and a passageway through one of said end plates which transmits ambient pressure changes, but not dynamic pressure changes, said receiver having a frequency response between 0.1k Hz and 30k Hz, said receiver being coupled to said transmitting means by a cable having a length exceeding 5 feet; determining the amplitude of tube waves detected by said receiver at a plurality of locations in said bore-hole; and, producing a log of values related to said determined tube wave amplitude and correlated with permeability values for said plurality of locations.
Claim 12
Dependent Claim
26 words
The method of claim 9 wherein said detecting is accomplished by said first receiver at a distance of at least fifteen feet from said transmitting means.
Claim 13
Dependent Claim
40 words
The method of claim 9, further including observing a change in said produced log of values from one of said plurality to another of said plurality of locations in said bore-hole as an indication of a change in formation permeability.
References Cited (Backward Citations)
US1176350A
Cited
US2396935A
Cited
US2842220A
Cited
US3181608A
Cited
US3252131A
Cited
US3276533A
Cited
US3292143A
Cited
US3309521A
Cited
GB1176350A
Cited
US3648278A
Cited
US3483505A
Cited
US3622969A
Cited
US3839899A
Cited
US3900826A
Cited
GB1534854A
Cited
US3962674A
Cited
US4178577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |