| 摘要 |
In the representative embodiment of the invention disclosed herein, an elongated wall-engaging pad carrying one or more formation-investigating devices is operatively mounted along one side of a well logging tool and arranged for tilting about an axis perpendicular to a plane of movement including the longitudinal axes of the tool body and the pad as the pad is urged against an adjacent borehole wall. To insure that the pad member is free to tilt as may be required for following irregular borehole walls, forwardly-urged positioning members are uniquely arranged on the tool above and below the pad for spatially positioning that side of the tool away from the adjacent borehole wall. One or more rearwardly-urged positioning members are also arranged on the opposite side of the tool and adapted to be pressed against the opposite borehole wall with only sufficient force to retain the spaced positioning members engaged with the adjacent borehole wall above and below the pad member. |
