Pump through equalizing check valve for use in intermittent gas lift well
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United States of America Patent
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-
Jul 17, 1984
Grant Date -
N/A
app pub date -
Apr 27, 1981
filing date -
Apr 27, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve apparatus for use in an intermittent gas lift subterranean well, having a reservoir with insufficient pressure for continuous delivery of produced fluids to the top surface of the well is disclosed. A valve apparatus carriable on a fluid transmission conduit has a flow passage for permitting produced fluids to flow through the transmission conduit from the reservoir. The valve is responsive to pressure to open the valve in the presence of a greater pressure exerted by the reservoir below the valve, and to close the valve in response to an even greater pressure generated by intermittent gas injection. A second flow passage selectively communicating with a radially extending port permits the flow of injected fluids from the tubing into the reservoir. A second valve, for selectively opening and closing the second flow passage, is spring biased in the closed position so that it remains closed when subjected to reservoir pressure, intermittent gas pressure, or their sum. The second valve is, however, opened in response to a greater pressure force due to an applied pressure including the pressure of injected fluids. The second valve comprises oppositely facing abutting shoulders, with one shoulder being biased into abutting relationship with the other shoulder for closing the port.
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