A plunger assembly arranged to minimize uneven wear spots or areas thereon during the plunger assembly's horizontal and vertical travel within a hydrocarbon producing well conduit. The plunger assembly comprises an elongated central mandrel having an elongated central bore extending longitudinally therethrough for transmitting fluids from a well through the plunger assembly, the elongated central mandrel having a generally cylindrically shaped outer surface along portions thereof, and a plurality of arcuately shaped wear pads guidedly supported on the cylindrically shaped outer portions of the central mandrel An array of elongated helically presented protrusions and a corresponding array of elongated helically presented grooves in mating interdigitation are arranged between the outer portions of the mandrel and their radially adjacent wear pads, so as to provide an inducement of rotation to the plunger assembly about its longitudinal axis during the plunger assembly's travel through a well conduit.