Apparatus and method for cleaning out an underground well
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Sep 26, 1991
filing date -
Dec 11, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method has been provided for cleaning a vertical, deviated or horizontal underground well. In which a maintenance tubing having a cleaning head at its end is lowered into a production pipe for suction of sediments. At a certain level above the region of the well to be cleaned, a hydraulic isolation device is installed in the annulus between the maintenance tubing and the production pipe. Fluid is injected into the annulus to activate the hydroejector which is located above the hydraulic isolation device to cause the suction of the sediments. The sediments downhole therefore can be cleaned out without introducing foreign fluid downhole.
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