US4356629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making well logging apparatus
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1980-04-21
•
Granted: 1982-11-02
•
Expires: 2000-04-21
Abstract
Abstract A replaceable insulating sleeve is disposed around the lower end of a drill string used in drilling a well. The sleeve is restrained from rotating relative to the drill string, but can be released and quickly slipped off the drill string in the field to permit rapid replacement if damaged, or if alternate equipment is required. The sleeve carries sensing means for measuring a characteristic of formations penetrated by the well.
Inventors
- 👤 John D. Jeter
- 👤 Henry S. More
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:06
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/02; F16F15/04; F16F15/08; E; E21; E21B; E21B17/00; E21B17/003; E21B47/00; E21B47/01; H; H01; H01R; H01R13/00; H01R13/46; H01R13/52; H01R13/523; H01R2107/00; H01R24/00; H01R24/58; H01R43/00; H01R43/20; H01R43/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/49224; Y10T29/49826; Y10T29/49885
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
A method for making an electrode assembly adapted to slide on and off a drill string to be used in a well for measuring electrical resistivity of earth formations traversed by the well, the method including the steps of: (a) forming a sleeve of insulating material by wrapping resin-coated fibers around an elongated and generally cylindrical mandrel, the mandrel having an exterior surface which converges toward one end so the sleeve is formed with an internal converging surface matching the external surface of the mandrel; (b) embedding at least one electrical conductor in the sleeve; (c) forming a recess in the outer surface of the sleeve to expose the embedded electrical conductor in the vicinity of the recess; (d) depositing metal within the recess to at least partially fill it and make electrical contact with at least part of the exposed electrical conductor; (e) curing the resin while the fibers are wrapped around the mandrel; and (f) thereafter slipping the sleeve from the mandrel and thereafter slipping the sleeve onto a drill string having an external surface matching that of the mandrel.
Claim 2
Independent Claim
182 words
A method for making an electrode assembly adapted to slide on and off a drill string to be used in a well for measuring electrical resistivity of earth formations traversed by the well, the method including the steps of: (a) forming a sleeve of insulating material by wrapping resin-coated fibers around an elongated and generally cylindrical mandrel, the mandrel having an exterior surface which converges toward one end so the sleeve is formed with an internal converging surface matching the external surface of the mandrel; (b) embedding at least one electrical conductor in the sleeve; (c) forming a recess in the outer surface of the sleeve to expose the embedded electrical conductor in the vicinity of the recess; (d) depositing metal within the recess to at least partially fill it and make electrical contact with at least part of the exposed electrical conductor; (e) curing the resin while the fibers are wrapped around the mandrel; and (f) thereafter slipping the sleeve from the mandrel and thereafter slipping the sleeve onto a drill string having an external surface matching that of the mandrel.
Claim 3
Dependent Claim
27 words
A method according to claim 1 in which the formation of the recess includes forming an outwardly opening, circumferential groove in the outer surface of the sleeve.
Claim 4
Dependent Claim
32 words
A method according to claim 1 or 2 in which the external surface of the mandrel includes longitudinally extending grooves and splines with surfaces which converge toward one end of the sleeve.
Claim 5
Independent Claim
145 words
A method for making a logging assembly adapted to slide on and off a drill string in a well for measuring a downhole characteristic in the well, the method including the steps of: (a) forming a sleeve of insulating material by wrapping resin-coated fibers around an elongated and generally cylindrical mandrel, the mandrel having an exterior surface which converges toward one end so the sleeve is formed with an internal converging surface matching the external surface of the mandrel; (b) embedding at least one electrical conductor in the sleeve; (c) securing sensing means to the sleeve; (d) connecting the electrical conductor to the sensing means; (e) curing the resin while the fibers are wrapped around the mandrel; and (f) thereafter slipping the sleeve from the mandrel and ther after slipping the sleeve onto a drill string having an external surface matching that of the mandrel.
Claim 6
Independent Claim
145 words
A method for making a logging assembly adapted to slide on and off a drill string in a well for measuring a downhole characteristic in the well, the method including the steps of: (a) forming a sleeve of insulating material by wrapping resin-coated fibers around an elongated and generally cylindrical mandrel, the mandrel having an exterior surface which converges toward one end so the sleeve is formed with an internal converging surface matching the external surface of the mandrel; (b) embedding at least one electrical conductor in the sleeve; (c) securing sensing means to the sleeve; (d) connecting the electrical conductor to the sensing means; (e) curing the resin while the fibers are wrapped around the mandrel; and (f) thereafter slipping the sleeve from the mandrel and ther after slipping the sleeve onto a drill string having an external surface matching that of the mandrel.
References Cited (Backward Citations)
US1744911A
Cited
US2364957A
Cited
US2344598A
Cited
US2568241A
Cited
US2857451A
Cited
US2871444A
Cited
US2925251A
Cited
US2930137A
Cited
US3079549A
Cited
US3149683A
Cited
US3072843A
Cited
US2938708A
Cited
US3134069A
Cited
US3293542A
Cited
US3408561A
Cited
US3377549A
Cited
US3381215A
Cited
US3466597A
Cited
US4152195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |