Frictional wear prediction method for high-temperature, high-pressure and high-yield tubing string casing

The invention discloses a frictional wear prediction method for a high-temperature, high-pressure and high-yield tubing string casing. The method comprises the steps of determining the total relative slippage displacement Lh of an oil casing of the tubing string casing according to a kinetic model of the tubing string casing; determining the contact force N of an oil pipe and the inner wall of the casing according to a high-temperature, high-pressure and high-yield gas well tubing string critical buckling load calculation model; carrying out an oil casing frictional wear unit test according to the field actual working condition material and the completion fluid to determine the sliding friction coefficient mu and the wear efficiency eta/Hb of the oil casing; and determining the wear volume and the wear area of the oil casing according to the total relative slippage displacement Lh of the oil casing, the contact force N of the oil pipe and the inner wall of the casing, the sliding friction coefficient mu and t