RU1819663C
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Device for producing finely divided drilling mud systems
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Device for controlling well operating mode
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Wellhead flow-restricting device
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SU1742462A1
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Device for prevention of drilling tool sticking
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Outer self-releasing spear
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Densimeter
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Device for placing cement plugs in wells
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Lateral core-taker
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Fishing downhole device
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Powder disperser
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Method of determining leaky condition of drill pipes
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Anchor
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Cutoff valve
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Lateral core taker
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Soil sampler
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Drilling rig for rotary drilling with back-flushing
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Method of investigating formation in multiple-bore wells with no overflow
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Arrangement for closing-off gushing well
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SU1804610A3
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Method of determining filtration characteristics of rocks
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Arrangement for deflecting a rock-breaking tool
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