OBRABOTKAMETALLOV technology Vol. 26 No. 3 2024 while Drilling (CwD) is a drilling method that has been proven to eliminate many problems encountered during drilling. In this method, drilling and casing of the borehole are carried out simultaneously, which increases drilling efficiency by reducing the UPT [1–5, 30–36]. Russian oil companies reported the use of retractable bits in casing drilling in 1920. Later, in the 1930s, USA operators used operational tubing for drilling in an open shaft or finishing without a face, while a flatbladed chisel was used for drilling [37–42]. The materials that best meet the requirements of the oil and gas industry are HSLA steels. The purpose of the work is to assess the influence of thermomechanical processing technologies on the microstructure and mechanical properties of high-strength steels based on the analysis of various studies conducted by various methods of metallography and mechanical properties tests, taking into account the influence of recrystallization, microstructural components and microphases. The objective of this analysis is to establish the relationship between microstructure and thermomechanical processing technologies in the production of casing pipes. The objectives of the work are to study the effect of Nb in industrial steels and identify the most effective methods for determining it at a low percentage, as well as to study various thermomechanical controlled rolling (TMCR) models and its effectiveness. Fig. 1. Well casing design
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