| 摘要 |
A system and apparatus for circulating well fluids in a well having a U-tube flow path therein, wherein the well fluids are utilized to pump loading fluids or dead or gas-free fluids into the well to kill the same, or to circulate well tools in the flow conduit by the pump-down through the flow line method without wasting the circulating fluids, or to displace the circulating fluids from the well, and to load the well with a loading fluid to perform other operations thereon. The well fluids may be used as a source of power for operating the pump of a system, and a hydraulic fluid pump may be utilized, or pressure from another source may be utilized, for operating the pump to circulate the fluids in accordance with the invention.
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