Abstract: The present invention relates to a well clean out tool comprising an elongated body having first and second ends and being adapted to be received within a well borehole. The elongated body is comprised of a plurality of subs including a first sub at a lower portion of the body having a one way valve for permitting only upward flow of fluid. A second sub is arranged above the first sub for receiving and retaining fluid and debris passing through the first sub while a third sub is arranged above the second sub. The third sub includes a second valve for permitting flow only upwardly through the third sub. A fourth or pumping sub is arranged above the third sub with the fourth sub including an outlet for returning fluid to the borehole. The pump sub includes an elongated hollow piston reciprocatingly driven within a casing of the fourth sub.

Abstract: Apparatus for skimming an overlying non-conductive lighter liquid from an underlying conductive heavier liquid in a two-liquid body which are particularly applicable for recovering oil and/or gasoline from a well. A skimmer designed to float in the two-liquid body contained in the well includes a closed cylindrical float, a hollow cylindrical skirt installed over a portion of one end of the float and permanently attached to the float. The end of the skirt surrounding the float is open to the lighter liquid. Spaced-apart liquid level controls are positioned on the skirt for sensing the liquid/liquid interface level. The other end of the skirt is connected to a pump for removing lighter liquids collected in the skirt. Means operated by the controls turn the pump off and on in response to higher and lower levels, respectively, of the two-liquid interface.

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.

Abstract: Well pumping method and apparatus by means of which the liquid level and, correspondingly, the hydrostatic pressure, in a bore hole or well casing, is controlled by means of a vertically adjustable sump for receiving liquid from the bore hole or casing before it is pumped to the surface, the sump having therein a pump which is actuated by the liquid level in the sump so that liquid cannot rise in the bore hole or casing above the top or inlet of the sump, as the liquid enters the sump at this point and is pumped to the surface from the sump, the operation being such that the liquid level in the bore hole or casing is controlled by vertically positioning the sump so that the height of the column of liquid in the casing or borehole above the point where liquid is coming from the formation can be maintained at a minimum with consequent increase in the differential hydrostatic pressure between that in the well bore and that in the formation in the direction of the well bore, enabling the maximum rate of liquid en