| 摘要 |
A pump apparatus for recovering hydrocarbons from downhole wells, having a seating surface adapted to sealingly engage an interior surface of a circumferential seal member situated within production tubing when said pump is in a downhole operative position. An isolation plug is provided, releasably coupled to a lower end of said pump, having sealing means thereon to sealingly engage said interior surface of said circumferential seal member when the isolation plug is linearly positioned within said circumferential seal member and decoupled from the pump assembly, thereby preventing gases and fluids from fluid communication to surface when the pump is raised and removed from the well. A method for sealing a well upon removal of a pump is further disclosed.
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