US4064939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for running and retrieving logging instruments in highly deviated well bores
Assignee: Western Atlas International Inc
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Filing: 1976-11-01
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Granted: 1977-12-27
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Expires: 1996-11-01
Abstract
Abstract The system consists of means for running a logging instrument connected to a long rigid extension on a logging cable through open-ended drill pipe. The extension consists of a number of sections of tubing that are joined together on top of the instrument as the instrument is lowered into the drill pipe prior to the logging cable being connected to the well logging instrument. As soon as the last section of the tubing has been added, the well logging cable, having an electrical probe member attached to its lower end and having weighting means to cause the probe to lower itself through the tubing, is fed down through the tubing and into a circulation and electrical connection sub connected to the well logging instrument itself. After the connection is made, the tubing and well logging instrument are supported by the well logging cable and together they are lowered further through the drill pipe and out through the end of the drill pipe until a cable tension adapter sub reaches a catcher sub at the end of the drill pipe. During logging, the logging cable is hoisted in the upward direction to log the formations surrounding the well bore beneath the lower end of the drill pipe.
Inventors
- 👤 Gerald L. Marquis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:11
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/08; E21B17/00; E21B17/003; E21B23/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A method for logging the formations surrounding an earth borehole, comprising: running a string of drill pipe within an earth borehole; running a string of tubing inside the said string of drill pipe, said string of tubing having a well logging instrument attached to the lower end of said tubing; lowering a weighted probe attached to a well logging cable through said tubing until said probe makes electrical contact with said well logging instrument; clamping said cable to an upper head member attached to the uppermost end of said string of tubing; lowering said tubing and said well logging instrument out the lower end of said drill pipe; and causing said well logging instrument and said tubing to traverse said borehole and to log at least a portion of the formations surrounding the borehole.
Claim 2
Independent Claim
134 words
A method for logging the formations surrounding an earth borehole, comprising: running a string of drill pipe within an earth borehole; running a string of tubing inside the said string of drill pipe, said string of tubing having a well logging instrument attached to the lower end of said tubing; lowering a weighted probe attached to a well logging cable through said tubing until said probe makes electrical contact with said well logging instrument; clamping said cable to an upper head member attached to the uppermost end of said string of tubing; lowering said tubing and said well logging instrument out the lower end of said drill pipe; and causing said well logging instrument and said tubing to traverse said borehole and to log at least a portion of the formations surrounding the borehole.
Claim 3
Independent Claim
171 words
A method for logging the formations surrounding an earth borehole, comprising: running a string of drill pipe within an earth borehole, the lower end of said drill pipe having a catcher sub attached thereto; running a string of tubing inside the said string of drill pipe, said string of tubing having a well logging instrument attached to the lower end of said tubing; lowering a weighted probe attached to a well logging cable through said tubing until said probe makes electrical contact with said well logging instrument; clamping said cable to an upper head member attached to the uppermost end of said string of tubing, the upper head member being sized larger than the exit opening of said catcher sub; lowering said tubing and said well logging instrument out the lower end of said drill pipe until said upper head member engages said catcher sub; and causing said well logging instrument and said tubing to traverse said borehole and to log at least a portion of the formations surrounding the borehole.
Claim 4
Independent Claim
171 words
A method for logging the formations surrounding an earth borehole, comprising: running a string of drill pipe within an earth borehole, the lower end of said drill pipe having a catcher sub attached thereto; running a string of tubing inside the said string of drill pipe, said string of tubing having a well logging instrument attached to the lower end of said tubing; lowering a weighted probe attached to a well logging cable through said tubing until said probe makes electrical contact with said well logging instrument; clamping said cable to an upper head member attached to the uppermost end of said string of tubing, the upper head member being sized larger than the exit opening of said catcher sub; lowering said tubing and said well logging instrument out the lower end of said drill pipe until said upper head member engages said catcher sub; and causing said well logging instrument and said tubing to traverse said borehole and to log at least a portion of the formations surrounding the borehole.
Claim 5
Dependent Claim
16 words
The method according to claim 2 wherein said instrument and said tubing are lowered by gravity.
Claim 6
Dependent Claim
21 words
The method according to claim 3 wherein said instrument and said tubing are lowered by pumping fluid down the drill pipe.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |