| 摘要 |
A cleanout tool for removing debris from a deep borehole, the borehole being characterized by having a relatively low hydrostatic head or level of liquid in the borehole. A series of unique check valves acting in cooperation with a pumping section are used to collect the debris into the debris reservoirs while passing the liquid upwardly through the cleanout tool. The check valves are unique in the fact that they are less prone to plugging and two sets are supplied in pairs so as to provide an extra margin of valving efficiency. The cleanout tool is operable in under low hydrostatic head conditions due to its improved pumping efficiency.
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