F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/40
F04B 47/00 (2006.01) F04B 47/08 (2006.01)
Patent
CA 1185119
ABSTRACT OF THE DISCLOSURE A piston-and-cylinder engine powered by compressed gaseous medium such as air, nitrogen, methane, helium, or hydrogen supplied at up to 20 atmospheres from a plenum via cylinder port to a face of a free piston fixed on a tubular piston rod extending through an end wall, the rod being connected to the piston of a reciprocating double-acting piston/cylinder pump raising a well fluid. A gas- distribution valve has an actuator rod formed with a shoulder which is pushed by the engine piston near the end of a stroke to energize a spring, and has a slender extension terminated in a head captive in the piston rod which is pulled by the piston near the end of its alternative stroke. At a predetermined piston/end wall clear- ance a trip mechanism frees a rotatable cylindric valve having channels to turn rapidly to a second position from its first position to register channels with valve ports for applying high pressure through a cylinder port approached by the piston, and connecting a low pressure line to the opposite port. When methane is used, the low pressure line may discharge into the well casing. The high pressure supply is preferably at 500°K or more and may be delivered by an adiabatic compressor. Up to three pairs of engines may be ganged in aiding relation to drive one pump. The engine/pump unit is supended at the ends of the tubing leading to surface. The high-pressure line may be insulated.
394120
Barnard Jack A.
Filipkowski R.j.
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