Abstract: A well cleanout tool which requires no hydrostatic head, and which can be either wireline or tubing conveyed and actuated. The tool comprises an elongated main body having a pump means flow connected to a debris-retaining chamber contained therein. The pump means is actuated by reciprocating the wireline or the tubing, as the case may be, thereby causing fluid to move through the tool, whereupon debris settles out in the debris-containing chamber, while substantial debris-free fluid flows through the pump, through an outlet formed in the upper end of the tool, and back into the borehole. The pump preferably is of the reciprocating type, having a splined driveshaft, which enables the tool to be rotated while it is being reciprocated, when it is tubing conveyed. Accordingly, it is unnecessary to undergo the expense of charging the borehole with a large hydrostatic head of fluid.