A specially designed system for use in highly deviated and bad holes which will mechanically position a stack of conventional-type logging devices opposite the zones or formations of interest. The Toolpusher uses drill pipe to push the logging devices to the desired depths in the well.
Once the tools have been assembled, they are lowered into the well on drill pipe until the top of the zone of interest is reached. At this point, a side entry sub is made up into the drill string through which the wireline is inserted and lowered to the latch assembly at the top of the tool stack. Its positive connection is ensured by applying tension to the wireline. The side entry sub is sealed. the hook and rotary table locked, (to minimize pipe rotation) and the drill string lowered until the tools are positioned at the bottom of the zone of interest. The wireline can be pumped down if necessary. Once in logging position, the compensated density tool is positioned with the rotary table such that an extendable pad on the tool contacts the high or low side of the hole.
The zone of interest is logged as the pipe is pulled out of the hole in single or multiple joints. Log data is multiplexed through a single conductor to the surface. When the zone of interest has been logged, tension is removed from the wireline releasing it from the latch. The wireline is recovered leaving the drilling crew a conventional trip out of the hole.
The logging devices available for use with the Toolpusher are: dual induction laterolog, compensated density, gamma ray, compensated neutron, and directional survey package. The Toolpusher is a Gearhart Industries trademark.