| 摘要 |
A swabbing tool for wells that filters particulates from fluids passing through the swabbing tool. The swabbing tool comprises a mandrel, at least one swab cup on the mandrel, the mandrel and swab cup being arranged to allow fluids to pass fro m below to above the swab cup; and a sifter attached to the swabbing tool below the swa b cup for filtering particulates from fluid passing from below to above the swab cup. The sifter is barrel shaped and is provided with a sealing element attached to the sifter to force fluid into the sifter. The sifter has an interior and the sealing element is dimensione d to seal against a casing or tubing wall and force fluid into the sifter. The openings in the sand sifting element may be slots, with a size between 0.125 mm to 0.635 mm.
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