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CN111677438A
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High-pressure jet power tool for drilling in ground mine, petroleum, petrochemical and coal bed gas
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CN108798555A
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A kind of oil seal spins bimodulus helicoid hydraulic motor
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CN108643872A
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A kind of heavy oil wells pumping wax-proofing apparatus
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CN108708682A
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Ground remote control downhole hydraulic cutting tool and control method
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Pass through the extension hanger and its control method of the rotation control of ground drilling rod
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Time-controlled extension hanger and its control method
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CN108468531A
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Pass through the underground back-pressure valve and control method of drilling rod speed Control
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CN108397149A
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Pass through the extension hanger back-off device and method of banded cable trigger communication control
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Remote control hydraulic pressure cementing well stage collar and control method
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CN108412450A
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The extension hanger and its control method controlled by ground RFID communication ball
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CN108386152A
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The extension hanger and its control method controlled by ground bit pressure
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CN108533215A
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The underground back-pressure valve and control method controlled by ground tubing string acoustic communication
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CN108425656A
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The cementing well stage collar and control method controlled by geostatic pressure wave
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CN108468525A
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The extension hanger and its control method controlled by electromagnetic wave
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CN108468526A
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The extension hanger back-off device and method controlled by ground sonar communication
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CN108518201A
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A kind of anti-overflow self-starting underground back-pressure valve
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CN108518194A
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The extension hanger back-off device and method controlled by current carrier
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CN108457620A
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Pass through the electro-hydraulic driving back-pressure valve and its control method of remote control
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CN108518197A
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The cementing well stage collar and control method controlled by downhole optic fiber
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CN108442899A
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Pass through ground control fluid pressure tailpiece hanger and its control method
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