method for estimating at least one downhole speed and downhole torque for drilling rig, device for estimating at least one downhole speed and downhole torque, well drilling rig , and computer program product

摘要

a method and a device, an oil well drilling rig, and a computer program product for estimating at least one downhole speed and downhole torque of the drilling rig while drilling a well in a earth formation. an oil well rig comprising a rotational drive system, a drill string, a well bottom assembly comprising a drill bit, an upper end coupled to the rotational drive system, and a speed controller arranged to control the rotational speed of the upper end drive by controlling an upper end drive torque. the method being performed on a computer based on a two-port transfer matrix computational model in the spectral domain of the well drilling rig (50). during drilling, the upper end drive rotational speed and upper end drive torque (54) are obtained, and the downhole speed and downhole torque of the well drilling equipment (55) is calculated. ) by reducing the spectral bandwidth and applying a time delay term to the calculations (53), allowing for a time domain causal solution.