Results of the analysis of solution of the tasks to determine the loss of axial load along the length of different types of columns based on their longitudinal and transverse strain in directional wells are presented. It is shown that the neglect of the magnitudes of transverse loads and shear forces leads to an error of calculation of loss of axial load on the friction along the length of the oil field column at its bottom spirally deformed area. The irrationality of such methods of calculation for directional and horizontal wells is confirmed.
Key words: local borehole curving, transverse-longitudinal deformation, helical spiral, pitch stability, friction coefficient, bending moment, shear load, transverse load, radius-vector, colomn curvature
List of references
1. Aleksandrov M.M. Sily soprotivleniya pri dvizhenii trub v skvazhine (Resistance force during pipes movement in a well). Moscow: Nedra, 1978, 209 p.
2. Yanturin A.Sh., Sultanov B.Z. Neft' i gaz. 1977, no. 5, pp. 15-20.
3. Merkin D.R. Vvedenie v mekhaniku gibkoy niti (Introduction in mechanics of a ideal cable). Moscow: Nauka, 1980, 240 p.
4. Vol'mir A.S. Ustoychivost' deformiruemykh sistem (Stability of deformable systems). Moscow: Fizmatgiz, 1963, 879 p.
5. Mayorov I.K. Neftyanoe khozyaystvo – Oil Industry, 1966, no. 4, pp. 28-32.
6. Lubinski A., Althouse W.S., Logan G.L. Helical Buckling of Tubing Sealed in Packers, Journal of Petroleum Technology, 1962, June, pp. 655-670.
