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Commonly used basic drilling assembly—pendulum drilling assembly
release time：2026-06-24
source： Internet
The pendulum drill string is a type of drill string assembly designed to reduce the well deviation angle. It utilizes the lateral component force of the drill collar weight below the tangency point in the deviated well to push the bit toward the lower side of the wellbore wall, thereby gradually reducing the deviation angle. This lateral component force resembles a pendulum, hence it is termed "pendulum force." The drill string assembled based on this principle is called a pendulum drill string.
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