Influence of drill-string lateral collision on wellbore stability of a horizontal well

A finite element model of wellbore stability was proposed for a horizontal well, and drill-string friction lateral collision in the process rotary motion were taken into account. An unconfined compression test used validation, normalized yielded zone area (NYZA) employed to analyze stability, influence on simulated. The results indicated that stress-strain curve numerical simulation consists with test, maximum relative error is <2.2%. evolution NYZA can be divided three typical stages: stage I (static balance), II (dynamic growth), III balance). Both normal shear stresses reach peak value II, while they always fluctuate relatively small range III, so mainly affected by first drill-string. acceleration effects have significant impact stability. initial position size drilling tool certain revolving speed almost has no impact. present paper guiding significance collapse prevention parameter optimization.