Vibrations and stability of a geometrically nonlinear weighty drill string for drilling oil and gas wells
Akhmetov S.М. Diarov M. Akhmetov N.М. Bizhanov D.T. Zaidemova Z.K.
2021National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2021#2Issue 4466 - 14 pp.
Heavy weight drill pipe (HWDP) in wells are hollow, weighty rods with stepwise changing physical properties (for example, stiffness), and each link of the string can deform according to geometrically nonlinear laws. They are the most critical part in the drilling process, transmitting power from the drilling rig to the rock failing tool, and are in hydrodynamic and contact interaction with the borehole walls, and are always curved. This occurs due to the curvature of the well itself, and under the action of its own weight, contact forces, as well as centrifugal forces in the case of rotation of the pipe. In this case, the curvature of the HWDP axis can be significantly influenced by the geometric nonlinearity of the deformation of its pipes. A review of this issue revealed a number of poorly studied problems, which include accounting for both phy-sically and geometrically nonlinear problems, accompanied by various types of complications (loss of stability HDWP, pipe breaks, etc.), as well as other processes in the elements of a dynamic drilling system (DDS). In this paper, based on the use of modern methods for studying dynamic processes in mechanical systems, a method is proposed for studying longitudinal oscillations of a geometrically nonlinear HWDP of its stability under torsion, taking into account the physical nonlinearity in the process of its deformation. The dependences characte-rizing this process are found.
Dynamic systems , Geometric nonlinea-rity , Heavy weight drill pipes , Longitudinal oscillations , Oil and gas wells , Stability
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Atyrau University of oil and gas named after S. Utebayev, Academician of the National Engineering Academy of the Republic of Kazakhstan, Academician of the Russian Academy of Natural Sciences, Atyrau, Kazakhstan
Atyrau University of Oil and Gas named after S. Utebayeva, Atyrau, Kazakhstan
JSC Financial Academy, Nur-Sultan, Kazakhstan
Atyrau University of oil and gas named after S. Utebayev
Atyrau University of Oil and Gas named after S. Utebayeva
JSC Financial Academy
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