E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/3
E21B 47/00 (2006.01) E21B 17/00 (2006.01) E21B 23/08 (2006.01) E21B 23/14 (2006.01) E21B 34/06 (2006.01)
Patent
CA 1071529
METHOD AND APPARATUS FOR RUNNING AND RETRIEVING LOGGING INSTRUMENTS IN HIGHLY DEVIATED WELL BORES Abstract of the Disclosure. 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 -1a- 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. In addition, this makes it possible to apply fluid pressure down the annulus which will tend to force the cable tension adapter sub up the drill pipe, thus helping to retrieve the logging instrument when stuck. In the other position of the valving system, there is free fluid movement through the cable tension adapter sub in the upward direction when there is a minimal tension on the cable clamp assembly to allow gravity descent of the instrument and extension system when possible and allows thrust development across the cable tension adapter sub by pumping fluid down the drill pipe. -1b-
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