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Completion Drill String Tools
The blowout preventer is used to prevent the mud, oil, gas, and water from spraying out in the well. The blowout preventers include ram blowout preventers, rotary blowout preventers and universal blowout preventers. They are installed at the wellhead under the drill floor and used separately It is used to close the annulus between the drill string and the casing or all the wellheads. In addition, there is a blowout preventer in the drill string to seal the internal space of the drill string.
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