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This page displays all 「FI」 in main group E21B37/00. |
HB:Handbook | ||||
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CC:Concordance | |||||
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Methods or apparatus for cleaning boreholes or wells (E21B 21/00 takes precedence) [2006.01] | HB | CC | 2D129 | |
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.Scrapers specially adapted therefor | HB | CC | 2D129 | |
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..operated by fluid pressure, e.g. free-piston scrapers [2006.01] | HB | CC | 2D129 | |
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.using chemical means for preventing or limiting the deposition of paraffins or like substances [2006.01] | HB | CC | 2D129 | |
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.cleaning in situ of down-hole filters, screens, or gravel packs (E21B 37/06 takes precedence) [3] | HB | CC | 2D129 | |
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.Well swabs [3] | HB | CC | 2D129 | |