TEST STUDY ON DRILLING STEM STABILITY OF ROTARY DRILLING IN THE SLANT HOLE

This paper describes how the rotary drilling stem lost its stability in detail, and presents the main factors influencing drill stem stability in rotary condition. As compared with the stability test in static condition, obvious different results are obtained, and this shows that the drill stem stability is greatly influenced in the rotary condition. The conclusions obtained from the study can be used as references for theoretical analysis and guides for field drilling.