Wells – Processes – Producing the well
Patent
1995-08-23
1997-06-03
Tsay, Frank
Wells
Processes
Producing the well
1661052, 417402, E21B 4300
Patent
active
056345216
ABSTRACT:
In a new valve assembly, the coacting abutting surfaces are imperfect due to normal fabrication techniques, and leakage occurs across these surfaces, which allows the control valve assembly to operate for a limited time while the engine parts are new, but continual engagement of the confronting top end of the control valve and stop member eventually become worn and firmly seats the control valve against its stop, and thus leakage across the control valve and stop member is precluded due to this progressive wear, whereupon the engine control valve will remain seated against its respective stop member and operation of the pump assembly is terminated until the malfunction is corrected. Premature stoppage, or stalling, of the top end of the main valve of a hydraulically actuated engine for downhole pumps is overcome in the present apparatus, and this feature is useful in many prior art pump assemblies. The present disclosure further enables a control rod of a hydraulically actuated engine for downhole pumps to be made much larger in diameter, making it possible to increase the operating speed of the coacting parts as well as the rate of produced fluid/per stroke, all of which represents unexpected improvements in operation of both the engine end as well as the pump end of the pump assembly.
REFERENCES:
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patent: 3703926 (1972-11-01), Roeder
patent: 3849030 (1974-11-01), McAuthur et al.
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patent: 5104296 (1992-04-01), Roeder
patent: 5494102 (1996-02-01), Schulte
Roeder George K.
Tsay Frank
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