Ufa State Petroleum Technological University, Ufa, Russia

R. A. Ismakov, Doctor of Engineering Sciences, Professor
Y. A. Yu. Abusal, Assistant
A. I. Safraider, Candidate of Engineering Sciences, Associate Professor, shakirova_ali@mail.ru
A. G. Raab, Candidate of Engineering Sciences, Associate Professor

The experience of constructing multilateral wells at TAML complexity levels has shown its relevance by increasing flow rates and reducing drilling costs. With this type of well completion, special attention must be paid to the cased part of the wellbore and to the running of the corresponding equipment, in particular the components of the drill string. Study of deformations of drill string components is a relevant problem since it allows determining the causes of destruction of metals due to the alternating stresses arising in the well–drill string system. Mechanical properties of materials get changed in the downhole conditions due to corrosion and physical impacts. Drilling fluids also have a physical and chemical effect on the mechanical properties of the surface layer of metals and alloys the bottom hole assembly (BHA) are made of. The analysis of the stress patterns and deformation in components of BHA reduces to the integrated FEM-based modeling of the behavior of metals. It is found that the maximal tensile stresses reach 450 MPa in 40 XH steel and 50 MPa in D16T alloy. By the indicator of change in the applied load in tension of the test samples, the most resilient sample was made of steel 20; the relative elongation of the sample totaled 30 %. This is connected with the high strength characteristics of this grade steel.
This work was supported by the Ministry of Science and Higher Education of the Russian Federation under Agreement No. 075-15-2022-297 within the framework of creation and development of the World-Class Research Center for Liquid Hydrocarbons.

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