Article

Received 17.03.2024

Revised 18.05.2024

Accepted 29.06.2024

Retrieved from Vol. 28, No. 1 2024

Pages 104 -114

Levkivska, L. (2024). Elastic closed bending of drill columns in cylindrical cavities of oil and gas wells. The National Transport University Bulletin, 28(1), 104-114. https://doi.org/10.33744/2308-6645-2024-1-58-104-114

Elastic closed bending of drill columns in cylindrical cavities of oil and gas wells

Liydmyla Levkivska

This article is devoted to the study of the process of supercritical deformation of the drill string, when as a result of protrusion it comes into contact with the wall of the oil and gas well and continues to change its shape under the action of increasing longitudinal force, distributed contact force and torque. The purpose of the work is to construct nonlinear differential equations describing the contact interaction of the drill string pipe with the well wall, to propose a method for their numerical solution, and to present the results of computer modeling. 114 Research methods are theoretical and experimental. The problem about non-linear bending of drill strings in cylindrical cavities of vertical hyper deep oil and gas bore-holes is considered. The key aspects of the process of closed deformation of the drill string and the ways of optimization and improvement of work in this area are established. The key aspects of the process of closed deformation of the drill string and the ways of optimization and improvement of work in this area are established. On the basis of the theory of flexible curvilinear rods with the use of a specially selected reference frame the non-linear ordinary differential equations are constructed, which describe contact interaction of the drill string with the bore-hole wall. The techniques for numerical solution of the constitutive equations are proposed. The results of computer simulation are discussed. It is shown that the bending of the column takes place in the form of a three-dimensional spiral with a variable pitch. At the same time, the values of internal shearing forces and moments are relatively small. The obtained results are an important tool for increasing the efficiency and economic profitability of the processes of drilling and operation of oil and gas wells. They can be used in various aspects of drilling and well operations, including risk prediction, optimization of the drilling process, development of new technologies, education and training of oil and gas well drilling personnel to ensure their competence in matters of safety and efficiency

drill string; well; internal and external forces; direct and inverse problems; closed deformation
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https://doi.org/10.33744/2308-6645-2024-1-58-104-114