Fremf°ring av et verkt°y langs en ikke-vertikal br°nn

摘要

A conveyance apparatus (16) comprises a pair of arcuate-shaped cams (20) pivotally mounted to a support member (22), means (26) for biasing the arcuate surface of each cam into contact with the borehole wall, and actuators (24) operatively connected to each cam. A logging tool is attached to the conveyance apparatus. When either actuator (24) is activated in a first direction, the cam connected to the activated actuator is linearly displaced forward and the arcuate surface of the cam (20) slides along the borehole wall. When either actuator (24) is activated in a second direction, the activated actuator pulls the connected cam (20) backwards and the biasing means (26) thereby urges the arcuate surface of the cam to lock against the borehole wall. Once the cam is locked, further movement of the actuator (24) propels both the conveyance apparatus and the logging tool forward along the highly deviated or horizontal borehole.