US3712414A
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: 1970-04-07
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Granted: 1973-01-23
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Expires: 1990-04-07
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
2026-10-25 23:48
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: 11
Claim 1
Independent Claim
211 words
Apparatus for acoustically logging earth formations in an open borehoLe or cement conditions in a cased borehole, comprising: a body member sized for passage through a well bore and having at least one acoustic transmitter thereon; at least three circumferentially spaced-apart movable arms carried by the body member; each of at least two of the arms carrying first and second longitudinally spaced-apart acoustic pads and each remaining arm carrying a third acoustic pad, each pad including an acoustic receiving transducer; means for extending and retracting the arms relative to the body member, said means being operative to extend the arms such that the acoustic pads carried thereon are brought into engagement with the surrounding borehole or casing surface, thereby tending to center the body member and the acoustic transmitter relative to said surface, and such that the transducers of the first and third acoustic pads are located in substantially a first horizontal plane and the transducers of the second acoustic pads are located in substantially a second horizontal plane spaced from the first horizontal plane; and means for selecting the transducers of the first and second pads for use in acoustic travel time logging and for selecting the transducers of the first and third pads for use in cement bond logging.
Claim 2
Dependent Claim
211 words
Apparatus for acoustically logging earth formations in an open borehoLe or cement conditions in a cased borehole, comprising: a body member sized for passage through a well bore and having at least one acoustic transmitter thereon; at least three circumferentially spaced-apart movable arms carried by the body member; each of at least two of the arms carrying first and second longitudinally spaced-apart acoustic pads and each remaining arm carrying a third acoustic pad, each pad including an acoustic receiving transducer; means for extending and retracting the arms relative to the body member, said means being operative to extend the arms such that the acoustic pads carried thereon are brought into engagement with the surrounding borehole or casing surface, thereby tending to center the body member and the acoustic transmitter relative to said surface, and such that the transducers of the first and third acoustic pads are located in substantially a first horizontal plane and the transducers of the second acoustic pads are located in substantially a second horizontal plane spaced from the first horizontal plane; and means for selecting the transducers of the first and second pads for use in acoustic travel time logging and for selecting the transducers of the first and third pads for use in cement bond logging.
Claim 3
Dependent Claim
23 words
The apparatus of claim 1 wherein four such movable arms are carried at quadrant spaced intervals about the exterior of said body member.
Claim 4
Dependent Claim
30 words
The apparatus of claim 2 wherein two of the four arms carry first and second acoustic pads, said two arms being located on diametrically opposed sides of the body member.
Claim 5
Dependent Claim
24 words
The apparatus of claim 1, further comprising means for repetitively firing the transmitter to transmit acoustic impulses into the materials surrounding the well bore.
Claim 6
Dependent Claim
54 words
The apparatus of claim 4 further including means, operative when the transducers of the first and second pads have been selected for use in acoustic travel time logging, for measuring the travel time of an acoustic impulse from the transmitter to a selected one of the receiving transducers of the first and second pads.
Claim 7
Dependent Claim
49 words
The apparatus of claim 5 further including means for combining a plurality of acoustic travel time measurements between the transmitter and the transducers of the first and second pads so as to produce an average acoustic travel time indication representative of characteristics of the earth formations surrounding the borehole.
Claim 8
Dependent Claim
76 words
The apparatus of claim 4 further including means, operative when the transducers of the first and third pads have been selected for use in cement bond logging, for measuring the amplitude of the early arrival acoustic impulses at each of the receiving transducers of the first and third pads to provide an indication of the bond between the casing and the cement in a cased borehole at the circumferential location of each of the receiving transducers.
Claim 9
Dependent Claim
35 words
The apparatus of claim 7 further including means for simultaneously recording a separate log of said early arrival amplitude measurements at each receiving transducer as a function of the borehole depth of the body member.
Claim 10
Dependent Claim
13 words
The apparatus of claim 1 wherein the acoustic transmitter is a steered-beam transmitter.
Claim 11
Dependent Claim
31 words
The apparatus of claim 9 wherein the main lobe of the beam of acoustic energy produced by the steered-beam transmitter is directed at an angle of approximately 20* to the horizontal.
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |