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SU1654526A1
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Nonreturn valve
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SU1714090A1
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Drill string float valve
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SU1601322A1
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Arrangement for stabilizing bit load
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SU1564325A1
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Valve for drill pile string
|
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SU1559129A2
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Stabilizer of weight of drilling tool
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SU1543054A1
|
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Composition for treating hole-bottom zone of carbonate formation
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SU1326739A1
|
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Positive-displacement rotary machine
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SU1239266A1
|
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Hole-bottom blowout preventer
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SU977711A1
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Checking valve for casing strings
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SU996718A1
|
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Plugging tool for setting bridges in boreholes
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SU968308A1
|
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Apparatus for dampening loads of drill string
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SU1033717A1
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Drilling tool weight stabilizer
|
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SU1002523A1
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Method of securing well walls
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SU921613A1
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Drilling mud dispenser
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SU883340A2
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Plugging composition for setting bridges in wells
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SU960851A1
|
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Pneumoelectric analog converter
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SU827762A1
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Formation testing device
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SU1361300A1
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Apparatus for eliminating seizures
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SU802540A1
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Formation pressure measuring method
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SU723100A1
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Arrangement for placing sealing member in borehole
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