Release of the stuck drill string by the method of frictional self-oscillations

Abstract

The mechanism of generation of forces, holding the drill pipes in case sludge sedimentation, caving in and collapse, as well as buckling and flow of plastic rocks, formation of oil seals was described. The modern ideas about friction forces were reviewed. A mathematical model of frictional self-oscillations for release a stuck drill string was developed. The necessity of application a vibration smoothing method of generating self-oscillations during emergency was substantiated. Using the computer program, parametric calculations of velocity change of the stuck drill pipe release were made. The author conducted numerical studies of the drilling line speed impact and oscillator frequency on the efficiency the sticking elimination process.