EXPERIMENTAL STUDY ON THE MECHANICS PERFORMANCE OF ECCENTRIC BOTTOM HOLE ASSEMBLY

The study of the mechanics performance for eccentric bottom hole assembly in vertical wells was conducted in lab with self-made drilling string test stand and installation. The effect of WOB, revolution, bending angle of bent sub and centralizer on the movement status of eccentric bottom hole assembly, side force of bit and torsional angle of drilling string was also analyzed. The results had a directive significance for theoretical study and actual drilling operation of eccentric bottom hole assembly.