Abstract: A well tool positioner is adapted for positioning the tool in a desired relation within a well pipe. The positioner includes a generally cylindrical resilient body adapted to be closely mounted around a tool with the major outside diameter of the body being substantially no larger than the outside diameter of the tool. At least three support vanes are formed with the body as an integral member with each vane being generally ellipsoidal in cross-section and extending perpendicular from the axis of the body and with the major axis of the generally ellipsoidal shape extending along the axis of the body. The body defines an exterior annular recess in the vicinity of the support vanes such that the recess provides an increase in effective flow area between the body and the outer tips of the vanes which at least partially compensates for the decrease of such flow area as caused by the total thickness of the vanes.

Abstract: A well conduit caliper tool which simultaneously measures the remaining wall thickness of a well conduit in situ and the minimum inside diameter of such conduit. A caliper feeler arm element which extends out the furthermost distance from the caliper tool activates a sensing element that produces the indication of remaining conduit wall thickness. Another caliper feeler arm element which extends out the least distance from the caliper tool activates another sensing element that produces the indication of the minimum inside diameter. At the earth's surface these indications are recorded on a continuous strip chart or log as the variation of such respective diameters through the interval of conduit measured by the caliper tool. Mechanical linkage wear compensation and linear mechanical movement through the linkage between the feeler arm elements and the sensing elements are provided.