US4588951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arm apparatus for pad-type logging devices
Assignee: Schlumberger Technology Corp
•
Filing: 1983-07-06
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Granted: 1986-05-13
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Expires: 2003-07-06
Abstract
Abstract An apparatus is described for urging the measuring pad of a well logging sonde into engagement with the wall of a borehole. A relatively long primary arm on which the pad is mounted includes an actuator, and is pivotally connected to the body of the well logging sonde by a member extending therefrom. A backup arm is pivotally mounted on the extension member and biased outward from the logging sonde by suitable resilient means. The backup arm also is positively connected to a displacement member associated with the actuator. The primary and backup arms are cooperatively withdrawn into the body of the logging sonde by operation of the actuator. Moreover, the logging sonde is made eccentric in the borehole by suitable resilient means connected between the extension member and the sonde body.
Inventors
- 👤 Herve Ohmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:55
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B23/00; E21B23/04; E21B47/00; E21B47/02; E21B47/026
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A well logging sonde comprising: an elongate body adapted for displacement along a borehole; a measuring pad adapted for engagement with the wall of the borehole; an arm device carrying said pad and pivotally connected to said body to allow lateral extension of said pad; a backup arm pivotally mounted on said arm device resilient means operatively connected between said arm device and said backup arm for biasing said backup arm outwardly of said body into engagement with the borehole wall in diametrical opposition to said pad; and actuator means mounted on said arm device, said actuator having a displaceable member operatively connected to said backup arm to pivot said backup arm against action of said resilient means.
Claim 2
Dependent Claim
118 words
A well logging sonde comprising: an elongate body adapted for displacement along a borehole; a measuring pad adapted for engagement with the wall of the borehole; an arm device carrying said pad and pivotally connected to said body to allow lateral extension of said pad; a backup arm pivotally mounted on said arm device resilient means operatively connected between said arm device and said backup arm for biasing said backup arm outwardly of said body into engagement with the borehole wall in diametrical opposition to said pad; and actuator means mounted on said arm device, said actuator having a displaceable member operatively connected to said backup arm to pivot said backup arm against action of said resilient means.
Claim 3
Dependent Claim
13 words
An apparatus as in claim 1, wherein said actuator comprises a simple-action jack.
Claim 4
Dependent Claim
18 words
An apparatus as in claim 1 further comprising means for resiliently connecting said arm device and said body.
Claim 5
Dependent Claim
29 words
An apparatus as in claim 3 wherein said resilient connecting means is connected to said arm device adjacent the pivotal connection of said backup arm to said arm device.
Claim 6
Dependent Claim
26 words
An apparatus as in claim 4 wherein said resilient means acting on said backup arm is a spring secured to a portion of said arm device.
Claim 7
Dependent Claim
21 words
An apparatus as in claim 1 further comprising standoff members longitudinally disposed on said body on both sides of said pad.
References Cited (Backward Citations)
US2754475A
Cited
US2669688A
Cited
US2712629A
Cited
US2842735A
Cited
US2965838A
Cited
US3132298A
Cited
US3060373A
Cited
US3167707A
Cited
US3166708A
Cited
US3254221A
Cited
US3356146A
Cited
US3462678A
Cited
US3521154A
Cited
US3564914A
Cited
US3566682A
Cited
US3601692A
Cited
US3772589A
Cited
US3795141A
Cited
US3973188A
Cited
US3760260A
Cited
US3961600A
Cited
US4205266A
Cited
US4110682A
Cited
US4117394A
Cited
US4251773A
Cited
US4243099A
Cited
US4412180A
Cited
US4432143A
Cited
US4480186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |