US4601024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Borehole televiewer system using multiple transducer subsystems
Assignee: BP Corp North America Inc
•
Filing: 1981-03-10
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Granted: 1986-07-15
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Expires: 2001-03-10
Abstract
Abstract In an acoustic logging system for providing information regarding selected parameters of the wall of a borehole in the earth, and of the rock formation which is adjacent the borehole, in which a single transmit/receive transducer system (T/RTS) mounted on a rotating assembly probes the wall of the borehole in a circular scanning pattern as a function of depth, the improvement which includes at least a second T/RTS mounted on the rotating assembly in known geometrical relation to the first T/RTS, and means to utilize in combination the electrical scan signals from the at least two scanning T/RTS.
Inventors
- 👤 Robert A. Broding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:14
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/40; G01V1/44; G01V1/46; E; E21; E21B; E21B47/00; E21B47/002; E21B47/0025; E21B47/08; E21B47/085
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
A Method of logging a borehole in the earth comprising: (a) generating a first acoustic signal having the frequency F1 at a depth in the borehole; (b) generating a second acoustic signal having the frequency F2 which is less than F1 in the borehole at approximately the depth; (c) generating a first electrical scan signal representative of a response to the first acoustic signal; (d) generating a second electrical scan signal representative of a response to the second acoustic signal; (e) discarding all of the first electrical scan signal except a first portion, (f) discarding a first portion of the second electrical scan signal and retaining a second portion, (g) adding the first portion of the electrical scan signal and the second portion of the second electrical scan signal and obtaining a composite signal.
Claim 2
Independent Claim
134 words
A Method of logging a borehole in the earth comprising: (a) generating a first acoustic signal having the frequency F1 at a depth in the borehole; (b) generating a second acoustic signal having the frequency F2 which is less than F1 in the borehole at approximately the depth; (c) generating a first electrical scan signal representative of a response to the first acoustic signal; (d) generating a second electrical scan signal representative of a response to the second acoustic signal; (e) discarding all of the first electrical scan signal except a first portion, (f) discarding a first portion of the second electrical scan signal and retaining a second portion, (g) adding the first portion of the electrical scan signal and the second portion of the second electrical scan signal and obtaining a composite signal.
Claim 3
Dependent Claim
34 words
The Method of claim 1 wherein: the first signal is selectably generated along a selected path encircling the wall of the borehole and the second signal is selectably generated along approximately the same path.
Claim 4
Dependent Claim
16 words
The Method of claim 3 wherein: the paths encircling the wall of the borehole are spiral.
Claim 5
Dependent Claim
16 words
The Method of claim 2 wherein: the paths cover a selected vertical interval of the borehole.
Claim 6
Dependent Claim
22 words
The Method of claim 1 wherein; the first acoustic signal and the second acoustic signal are directed along approximately the same path.
Claim 7
Independent Claim
164 words
A Method of logging a borehole comprising: (a) generating a first beam of acoustic energy in the borehole having a frequency F1 and directed along a path in a borehole; (b) receiving reflected responses from the first beam of acoustic energy and obtaining a first reflected signal and producing a first electrical scan signal; (c) generating at least a second beam of acoustic energy in the borehole having a frequency F2, which is different from F1, and directed along essentially the path; and (d) receiving reflected responses from the at least a second beam of acoustic energy and obtaining at least a second reflected signal and producing at least a second electrical scan signal; and (e) combining the first electrical scan signal and the second electrical scan signal and producing a combined signal having a greater depth of penetration than that resulting form second frequency F2 alone and having an improved record in the near field from that produced by first frequency F1 alone.
Claim 8
Independent Claim
164 words
A Method of logging a borehole comprising: (a) generating a first beam of acoustic energy in the borehole having a frequency F1 and directed along a path in a borehole; (b) receiving reflected responses from the first beam of acoustic energy and obtaining a first reflected signal and producing a first electrical scan signal; (c) generating at least a second beam of acoustic energy in the borehole having a frequency F2, which is different from F1, and directed along essentially the path; and (d) receiving reflected responses from the at least a second beam of acoustic energy and obtaining at least a second reflected signal and producing at least a second electrical scan signal; and (e) combining the first electrical scan signal and the second electrical scan signal and producing a combined signal having a greater depth of penetration than that resulting form second frequency F2 alone and having an improved record in the near field from that produced by first frequency F1 alone.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |