| 摘要 |
An apparatus for connection to an oil well pump to improve its performance. The oil well pump is of the type having a traveling valve located within a barrel at the end of a string of production tubing and reciprocated by a string of sucker rods in the tubing. The apparatus includes a sub connected to the lower end of the production tubing. The barrel with a pump plunger and traveling valve is attached below the sub. The sub has a central passage and several valve passages. A tube is secured to the central passage. A piston reciprocates in the tube and is connected to the sucker rods at the top and to the pump plunger below. Standing valves are secured to the tops of the valve passages to allow only upward flow, isolating the pump plunger from the production column on the downstroke.
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