Paliichuk I. Enhancement of Tightness of Threaded Joints of Casing Pipes of Oil and Gas Wells

The dissertation deals with the enhancement of impermeability of threaded joints of casing pipes by means of construction improvement of seal assembly and programming of their working capacity parameters taking into account operational loadings. The computer-generated model of the elastic-deformed state of pipe and coupling joint with seal assembly is designed on the basis of the moment theory of short cylinders with variable thickness of their walls, Lame's formulas and the formula of contact pressure found by the author. The studies of contact pressures dependence from radial tension, thicknesses of walls, internal and external pressures, thrust load have allowed to determine new influencing patterns of constructional and operational factors on leakproofness of threaded joints of casing pipes with seal assembly.