RESEARCHING AND PRACTICE OF DEVIATION CONTROL BY INCREASING WOB

Convention deviation control BAH require low weight or stabilizers in collar.so that drilling rate is decreased and troublesome caused in downhole easily. New deviation control Technology-slick drilling collar assembly with greater bit weight have dynamically axial force but pendulum and inertia centrifugal force. New concepts of deviation control have shown that drillstring buckling and whirling occurs with increasing bit of weight, so that a periodical axial force takes place when deviations of wellbore exist. The axial force provided bit to formation with a periodical component force that change breaking rate and direction drillstring of bit, so it is useful to control deviation of well. This technology mentioned above have achieved good effect in the Southwest of Tarim.