caa a22 4500 463165209 CHVBK 20180406164759.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s10778-007-0128-1 doi (NATIONALLICENCE)springer-10.1007/s10778-007-0128-1 Theoretical identification of forces resisting longitudinal movement of drillstrings in curved wells [Elektronische Daten] [V. Gulyaev, P. Lugovoi, S. Khudolii, L. Glovach] The equations of balance of external and internal forces acting on a drillstring in a curved well are set up based on the formulations of direct and inverse problems in the mechanics of flexible curvilinear rods. The lowering, lifting, and rotation of a drillstring are studied. A method is proposed to calculate the internal longitudinal force, the forces of interaction between the drillstring and the well wall, and the forces of friction. An example is considered. It is shown that even small geometrical imperfections of the well path have a significant effect on the balance of external and internal forces Springer Science+Business Media, Inc., 2007 curvilinear drillstring nationallicence force of friction nationallicence direct problem nationallicence inverse problem nationallicence Gulyaev V. National University of Transport, Kyiv, Ukraine aut Lugovoi P. S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kyiv aut Khudolii S. National University of Transport, Kyiv, Ukraine aut Glovach L. National University of Transport, Kyiv, Ukraine aut International Applied Mechanics Springer US 43/11(2007-11-01), 1248-1255 1063-7095 43:11<1248 2007 43 10778 https://doi.org/10.1007/s10778-007-0128-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10778-007-0128-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gulyaev V. National University of Transport, Kyiv, Ukraine aut NATIONALLICENCE 700 1- Lugovoi P. S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kyiv aut NATIONALLICENCE 700 1- Khudolii S. National University of Transport, Kyiv, Ukraine aut NATIONALLICENCE 700 1- Glovach L. National University of Transport, Kyiv, Ukraine aut NATIONALLICENCE 773 0- International Applied Mechanics Springer US 43/11(2007-11-01), 1248-1255 1063-7095 43:11<1248 2007 43 10778 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer