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Injection well downhole flow regulator
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Distributor
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Tubing anchor
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A kind of pilot production tool of blowout prevention
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A kind of well blanking plug
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Oil pipe continuous sand flushing system
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A kind of height-adjustable oil pumping rod centering device
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A kind of elastic oil pumping rod centering device in oil field
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Side-mounted oil pumping rod centering device
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A kind of bridge plug with combination packing element
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A kind of repeatable gradually deblocking packer utilized
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A kind of repeatable high pressure resistant packer utilized
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A kind of repeatable expansion type casing external packer utilized
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A kind of screw pump direct-driving device put on brake apparatus
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A kind of screw pump direct-driving device of utilization hydraulic braking polished rod
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A kind of screw pump direct-driving device of utilization hydraulic braking motor shaft
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Directly drive extracting device of oil in a kind of screw pump ground with reverse-rotation preventing function
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Directly drive extracting device of oil in screw pump ground
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