Abstract: A swab assembly for use within a pump barrel includes a longitudinal swab bypass mandrel which has a top end connectable to a reciprocating member and at least one longitudinal bypass channel on its circumference and axially spaced stop shoulders at each end of the bypass channel with a smooth sealing portion between the bottom end of the bypass channel and the lower stop shoulder. At least one swab cup is slidable vertically on the bypass mandrel between an uppermost fluid bypass position and a lowermost fluid lifting position. The swab cup has a generally cylindrical outer body formed of flexible resilient material surrounding a tubular metal sleeve and has a central longitudinal bore coaxial with the bore of the sleeve. The cup body has an upper portion extending beyond the top end of the sleeve and a lower portion extending below the bottom end of the sleeve.

Abstract: A well clean out tool installed in a drill string is operable to pump sand and debris from the well bore. A pump portion includes an elongate pump barrel having apertures extending through its side wall at the upper end which is attached at its bottom end to one or more the debris-receiving and trapping subs and enclosed at its upper end by a top cap having a hexagonal opening. A hexagonal pump mandrel extends through the top cap and is connected to the bottom of the drill string by a top sub having apertures through its side wall whereby the pump barrel may be rotated with the drill string. A swab assembly contained within the pump barrel and connected to the bottom end of the pump mandrel is reciprocated thereby. The swab assembly includes a cruciform swab bypass mandrel having longitudinal fluid bypass channels with stop shoulders at each end thereof. One or more swab cups having internal metal sleeves ride on the exterior of the bypass mandrel.