F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
F04B 47/12 (2006.01)
Patent
CA 2116614
An oil pumping jack of improved efficiency and safety, with an electric- hydraulic manifold that provides soft shift spool in normal operation. Hydraulic compensation in the form of sacrifice of fluid output is provided if the work load increases, so that the system slows down visibly, signalling the operator and avoiding downhole damage. Further efficiency is achieved through avoidance of horizontal forces on the well-head linkage by fashioning the horseheads to have the face farthest from the center of rotation of the fulcrum beam be a convex portion of a circle circumference whose radius is the distance to the center of rotation. Safety features include a safe and total shutdown by interruption of the electrical control circuit, a positive hydraulic lock holding the pump jack in its stopped position without pressure on the hydraulic seals or fittings, and a longer circumference on the balance horsehead to facilitate tapping the well-head bottom without manual adjustments.
Dingwall Terry
Thompson Lambert Llp
LandOfFree
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