| 摘要 |
A downhole pump having a gas release probe which probe can be easily applied to a conventional travelling barrel downhole pump by merely lengthening such barrel by providing a variable length spacing sleeve above the travelling valve. The trip rod of the probe lifts off the valve element of the valve from its valve seat to release any gas or foamy oil otherwise trapped between the lower standing valve and the upper travelling valve of the pump. The invention is useful for obtaining oil under subterranean formation conditions that do not normally permit such recovery efficiently due to gas locks and can be either provided in a downhole pump or added to a preexisting pump. The term variable length spacing sleeve is used to describe a spacing sleeve whose length is established to suit a particular operating environment, and which length is determinable by one skilled in the art after considering the various operating parameters of the oil well in question.
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