US3811529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic logging apparatus for travel time and cement bond logging
Assignee: Schlumberger Technology Corp
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Filing: 1972-11-08
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Granted: 1974-05-21
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Expires: 1992-11-08
Abstract
Abstract An illustrative embodiment of the present invention includes an acoustic well logging sonde having four articulated arm members disposed at quadrant intervals about a central tubular body member and having an acoustic transmitting transducer disposed on the lower portion of the body member. Two of the diametrically disposed arms carry a pair of acoustic receiving transducers displaced longitudinally from each other while the other two diametrically opposed arms each carry a single acoustic receiving transducer. A switching arrangement is provided for selecting groups of four of the six articulated transducers for making either cement bond log measurements or acoustic travel time measurements.
Inventors
- 👤 G Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:21
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/40; G01V1/44; G01V1/46; E; E21; E21B; E21B47/00; E21B47/005; G01V1/52; G01V1/523
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
Wall engaging acoustic pad apparatus for use in acoustic well logging of both open and cased boreholes, comprising: a generally trough-shaped support member, the open side thereof being adapted to face outwardly toward tHe wall of a borehole; an acoustic receiving transducer element positioned within said support member and having an inwardly facing side and an outwardly facing side; a massive backing member having relatively poor acoustical transmission properties disposed in touching contact with said inwardly facing side of said transducer element; acoustically absorbent means interposed between said support member and said backing member for acoustically insulating said transducer element from said support member; protective covering means positioned over the open side of the trough-shaped member and said outwardly facing side of said transducer element; and outer acoustically low noise wall engaging means disposed over said protective covering means.
Claim 2
Dependent Claim
139 words
Wall engaging acoustic pad apparatus for use in acoustic well logging of both open and cased boreholes, comprising: a generally trough-shaped support member, the open side thereof being adapted to face outwardly toward tHe wall of a borehole; an acoustic receiving transducer element positioned within said support member and having an inwardly facing side and an outwardly facing side; a massive backing member having relatively poor acoustical transmission properties disposed in touching contact with said inwardly facing side of said transducer element; acoustically absorbent means interposed between said support member and said backing member for acoustically insulating said transducer element from said support member; protective covering means positioned over the open side of the trough-shaped member and said outwardly facing side of said transducer element; and outer acoustically low noise wall engaging means disposed over said protective covering means.
Claim 3
Dependent Claim
46 words
The apparatus of claim 1 wherein said wall engaging means comprises a layer of plastic material having a plurality of longitudinally extending skid surfaces on the external surface thereof, said skid surfaces affording a relatively noiseless contact surface for engagement with the wall of a borehole.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 wherein said acoustic receiving transducer element comprises a disc shaped piezoelectric element.
Claim 5
Dependent Claim
23 words
The apparatus of claim 1 wherein said protective covering means comprises an open work, zig-zag metallic member which transmits acoustic energy relatively slowly.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |