Abstract: A sonic logging tool which includes a relatively short sonic wave isolation section and further includes a structural member surrounding a pressure wave generating apparatus for creating a damping shorted turns effect is disclosed. The isolation section includes interlocking ends having serpentine edges which are spaced from each other, but which are interlocked for preventing longitudinal separation of the two ends. The isolation section also includes a damping material disposed between the spatially separated serpentine edges. The structural portion permits an electrical current to pass therethrough around the pressure wave generator apparatus.

Abstract: A test cup for pressure testing tubing comprising an elastomeric sleeve having a belled end, and further including an axially extending tubular portion positioned concentrically within the belled end and defining therewith a fluid-receiving cavity. The tubular portion is mounted to an internal metallic tube which projects axially into the sleeve beyond the reach of the fluid-receiving cavity in concentric relation to the bore through the sleeve. At its end opposite the belled end, the sleeve has embedded therein a plurality of circumferentially spaced reinforcing ring segments of generally L-shaped cross-section.

Abstract: A rod packing for stripping oil from a string of sucker rods as they are removed from the oil well, and including a pair of interfitting semicylindrical packing halves joinable to each other at a diametrical plane by pairs of mating protuberances and sockets. An axial bore is formed by mating semicylindrical grooves in the packing halves which are in registry when the packing halves are joined. Opposite ends of the axial bore communicate with frusto-conical recesses centered in the opposed planar ends of the joined semicylindrical packing halves, and each of the packing halves includes a pair of spaced, substantially parallel, chordally extending grooves in one of the planar ends thereof positioned to intersect the respective frusto-conical recess in that planar end, and to receive accumulated liquid therefrom.