When well, the purpose of installing Downhole Blowout Preventer in the event of overflow which from the underground near the source.
安装井下防喷器的目的是在发生井涌或溢流的时候，从井下源头附近就能够阻止井喷。
It USES the vibrations produced by a drill bit while drilling as a downhole seismic energy source.
随钻地震技术是利用钻井期间旋转钻头的振动作为井下震源。
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