US4082144A
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: 1978-04-04
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Expires: 1996-11-01
Abstract
Abstract The system consists of means for running a logging instrument and a long semi-rigid extension on a logging cable through open-ended drill pipe. A head on the upper end of the extension conforms sufficiently close to the inside diameter of the drill pipe that pump pressure down the drill pipe develops thrust across the head to push the extension and logging instrument down the well bore. A catcher sub at the lower end of the drill pipe prevents the extension from being pumped out the bottom of the drill pipe. As the extension and logging instrument are pulled back into the drill pipe by the logging cable, well bore measurements are made and recorded over the interval below the bottom of the drill pipe. The extension consists of a number of sections that are joined together on top of the instrument as the instrument is lowered into the drill pipe on the logging cable, the extension sections each having a slot along their entire length in order that the extension will fit around the logging cable. In one embodiment, the extensions are formed of a threaded steel insert connected to a dissimilar metal, for example, aluminum, by a special welding technique in order to enable the entire extension system to be lighter weight and thus supportable by the logging cable. A cable tension adapter sub at the uppermost top extension causes fluid ports to be rerouted to enable free fluid movement downward through the cable tension adapter sub and restricted movement in the upward direction. This minimizes swab load when logging out of a well.
Inventors
- 👤 Gerald L. Marquis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:27
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/14; E21B17/00; E21B17/003; E21B23/08; E21B34/00; E21B34/06; E21B34/066
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
A method for logging the formations surrounding an earth borehole, comprising: attaching a well logging instrument to a well logging cable; attaching a plurality of tubular extensions to each other end to end, the lower one of said extensions being connected to said instrument, each of said extensions having a slot along its entire length to allow said cable to be placed within said extensions as said extensions are being connected together; and causing said instrument and said plurality of extensions to traverse said borehole and to log at least a portion of the formations surrounding said borehole.
Claim 2
Independent Claim
98 words
A method for logging the formations surrounding an earth borehole, comprising: attaching a well logging instrument to a well logging cable; attaching a plurality of tubular extensions to each other end to end, the lower one of said extensions being connected to said instrument, each of said extensions having a slot along its entire length to allow said cable to be placed within said extensions as said extensions are being connected together; and causing said instrument and said plurality of extensions to traverse said borehole and to log at least a portion of the formations surrounding said borehole.
Claim 3
Independent Claim
140 words
A method for logging the formations surrounding an earth borehole, comprising: running a string of drill pipe within an earth borehole; attaching a well logging instrument to a well logging cable; attaching a plurality of tubular extensions to each other end to end, the lower one of said extensions being connected to said instrument, each of said extensions having a slot along its entire length to allow said cable to be placed within said extensions as said extensions are being connected together; lowering said instrument and said plurality of extensions through said drill pipe until said instrument and at least some of said extensions have passed out through the bottom of said drill pipe; and causing said instrument and said plurality of extensions to traverse said borehole and to log at least a portion of the formations surrounding said borehole.
Claim 4
Independent Claim
140 words
A method for logging the formations surrounding an earth borehole, comprising: running a string of drill pipe within an earth borehole; attaching a well logging instrument to a well logging cable; attaching a plurality of tubular extensions to each other end to end, the lower one of said extensions being connected to said instrument, each of said extensions having a slot along its entire length to allow said cable to be placed within said extensions as said extensions are being connected together; lowering said instrument and said plurality of extensions through said drill pipe until said instrument and at least some of said extensions have passed out through the bottom of said drill pipe; and causing said instrument and said plurality of extensions to traverse said borehole and to log at least a portion of the formations surrounding said borehole.
Claim 5
Independent Claim
162 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; attaching a well logging instrument to a well logging cable; attaching a plurality of tubular extensions to each other end to end, the lower one of said extensions being connected to said instrument, each of said extensions having a slot along its entire length to allow said cable to be placed within said extensions as said extensions are being connected together, the upper end of the uppermost extension having a head sub with an enlarged section sized larger than the exit opening of said catcher sub; lowering said instrument and said plurality of extensions through said drill pipe until said head sub engages said catcher sub; and raising said extensions and said instrument to log a portion of the formations surrounding the earth borehole beneath the catcher sub.
Claim 6
Independent Claim
162 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; attaching a well logging instrument to a well logging cable; attaching a plurality of tubular extensions to each other end to end, the lower one of said extensions being connected to said instrument, each of said extensions having a slot along its entire length to allow said cable to be placed within said extensions as said extensions are being connected together, the upper end of the uppermost extension having a head sub with an enlarged section sized larger than the exit opening of said catcher sub; lowering said instrument and said plurality of extensions through said drill pipe until said head sub engages said catcher sub; and raising said extensions and said instrument to log a portion of the formations surrounding the earth borehole beneath the catcher sub.
Claim 7
Dependent Claim
16 words
The method according to claim 3 wherein said instrument and said extensions are lowered by gravity.
Claim 8
Dependent Claim
21 words
The method according to claim 3 wherein said instrument and said extensions are lowered by pumping fluid down the drill pipe.
Claim 9
Dependent Claim
108 words
A tubular extension member for use in traversing an earth borehole, comprising: a cylindrical tube having first and second ends, one of its said ends having an L-shaped member and a first external threaded member intermediate said L-shaped member and said tube, the other of said ends having a U-shaped member and a second external threaded member intermediate said U-shaped member and said tube; and a groove extending between the outermost limits of said L-shaped and U-shaped members, through each of said external threaded members, and along the length of said cylindrical tube, whereby said tube can be placed in an encircling manner around a well logging cable.
Claim 10
Dependent Claim
108 words
A tubular extension member for use in traversing an earth borehole, comprising: a cylindrical tube having first and second ends, one of its said ends having an L-shaped member and a first external threaded member intermediate said L-shaped member and said tube, the other of said ends having a U-shaped member and a second external threaded member intermediate said U-shaped member and said tube; and a groove extending between the outermost limits of said L-shaped and U-shaped members, through each of said external threaded members, and along the length of said cylindrical tube, whereby said tube can be placed in an encircling manner around a well logging cable.
Claim 11
Dependent Claim
85 words
A system for joining together a pair of tubular extension members in accordance with claim 6, being characterized by the L-shaped member of one of said tubular members being mated with the U-shaped member of the other of said tubular members and being further characterized by the addition of a split collar having a groove along its length and internal threads therein to threadedly engage the external threads intermediate the L-shaped member on one of the tubes while encircling said mated L-shaped and U-shaped members.
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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |