Abstract: A fluid transfer module is provided with multiple flow paths for transferring multiple fluids. The module is particularly useful in downhole pumps for passing oil upwardly through a central passage and for passing gas up or down through concentric passages around the central passage. The module also can be used for water or fuel, particularly for downhole steam generation. The module includes an elongate housing or production tubing with an inner coupling having an attached, elongate inner tube which together form a central passage extending substantially the length of the housing. An outer coupling with an attached, elongate outer tube form an inner concentric passage with the inner coupling and tube and an outer concentric passage with the housing. The concentric flow paths are less restrictive to the flow of fluids therethrough.

Abstract: A pneumatically operated impact drilling tool for earth drilling, includes a reciprocating hammer, an anvil positioned under the hammer and a feeder tube extending through the hammer. The drilling tool is connected to a string of drilling pipe and high pressure compressed air or other pneumatic fluid is introduced to operate the tool. The feeder tube directs the flow of fluid through ports in the hammer to alternate pressure on opposite sides of the hammer to move the same upward and downward relative to the anvil. An elastomeric check valve is positioned inside the upper end of the feeder tube. The air inlet end of the tube is also provided with air jet passages extending upward and outwardly and having check valves operated in the outflow direction. A flow controlling washer may also be provided at the inlet to the check valve in the feeder tube.

Abstract: A pneumatically operated impact drilling tool for earth drilling, includes a reciprocating hammer, an anvil positioned under the hammer and a feeder tube extending through the hammer and at least partially through the anvil. The drilling tool is connected to a string of drilling pipe and high pressure compressed air or other pneumatic fluid is introduced to operate the tool. The feeder directs the flow of fluid through ports in the hammer to alternate pressure on opposite sides of the hammer to move the same upward and downward relative to the anvil. A venturi arrangement in the feeder tube functions to produce a vacuum which is applied to the opposite end of the hammer from the end at which pressure is being applied for moving the same.