FIELD: oil producing industry; wash conditioning during downhole hydraulic motor drilling. SUBSTANCE: filter pipe 2 and guide pipe 3 are mounted in filter body 1. Shear pin 9 fixes telescopic coupling of filter pipe 2 and guide pipe 3. The free end of filter pipe 2 is provided with a stop member 10 to conduct drilling string vibrations to filter pipe 2 and to clean filter perforations of cuttings. Filter pipe 2 and guide pipe 3 have different number of inlet perforations. EFFECT: enlarged operating capabilities. 3 cl, 2 dwg
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|
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| 0 |
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SU1776776A1 | |
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|
RU2061829C1 |
