Variable bore ram-type blowout preventer, as an improved blowout preventer, is capable of sealing around drill pipes with a range of sizes and has advantages such as low cost and convenience.

可变径闸板防喷器作为新型的闸板防喷器，能够密封一定范围内多种规格的钻具，具有成本低、使用方便等特点。

youdao

It is an inside BOP (blowout preventer)in the drill string.

投入式止回阀是钻柱内防喷器。

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Variable bore ram-type blowout preventer, the improved type, is capable of sealing drill tools whose sizes are within a certain range, and has advantages of low cost and convenience.

可变径闸板防喷器作为新型的闸板防喷器，能够密封一定范围内多种规格的钻具，具有成本低，使用方便的优点。

youdao

As a prelude to permanently shutting down the well, crews are trying to withdraw drill pipe hanging below the bottom of the blowout preventer and remove it from the well, so they can then remove the capping stack that's kept oil from leaking since July 15 and replace the old blowout preventer with a new one.

CNN: STORY HIGHLIGHTS

Once the blowout preventer is replaced to mitigate the risk of pressure in the well, it will take about four days to drill through the relief well and intercept the main well, based on statements from Allen.

CNN: STORY HIGHLIGHTS