Method and apparatus for running and retrieving logging instruments in highly deviated well bores

Patent · Tue Apr 04 04:00:00 EST 1978

OSTI ID:6801915

Marquis, G L

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.

• Assignee: Dresser Industries, Inc.
• Patent Number(s): US 4082144
• OSTI ID: 6801915
• Country of Publication: United States
• Language: English

Related Subjects

440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BOREHOLES
CABLES
CAVITIES
DIRECTIONAL DRILLING
DRILLING
EQUIPMENT
INCLINATION
POSITIONING
WELL LOGGING