METHOD FOR ADAPTIVE CONTROL OF WELL-DRILLING PROCESS

摘要

FIELD: oil and gas industry.SUBSTANCE: model is adapted to downhole conditions by means of its coefficients changing, calculation of optimal parameters and drilling of a well in optimal modes which is determined by minimum vibration frequency of drill pipe. The method envisages multiple coefficients updating for power law model by results of well measurements, calculation of optimal parameters of control against the criterion of maximum mechanical speed, performance of drilling at calculated parameters with optimum control against minimum vibration of the drill pipe. Besides drilling model the method uses flushing model for the purpose of even drilling and cleaning of wellbore from drill cuttings and also strata model characterising ability of formations for drilling.EFFECT: increasing accuracy for control of drilling mode and increasing mechanical speed of hole making due to optimisation of control over minimum vibration of the drill pipe.3 dwg