Improvement of the technology and engineering of oil and gas wells fastening

The article discusses the latest well completion technologies that reduce economic costs and construction time, including casing drilling, expandable casing technology and monodiameter. The advantages and disadvantages of these technologies are considered. Casing drilling is one of the most advanced well construction methods at the moment, which provides prevention of complications in the wellbore due to simultaneous drilling and casing of the wellbore with casing pipes directly in the process of work. Due to the dimensions of the casing, there is constant contact with the well wall, which leads to mechanical clogging. When drilling deep, ultra-deep wells and wells with large wastes, there is a need for a large number of casing strings of different diameters and there is not always enough pipe assortment to provide them. One of the technological solutions for maintaining the diameter of casing strings when designing a well design is the use of expandable casing pipes. Of all the advantages of using expandable tubular products, only one of them has the greatest potential - a well with a single bore diameter (Monodiameter). Monodiameter technology reduces the telescopic effect inherent in traditional designs. The possibility of combining two technologies into one, namely drilling with expandable casing pipes, is substantiated, which will lead to obtaining a well of one bore diameter (monodiameter). It is shown that the use of an expandable casing instead of a drill string is subject to greater risks than drilling with an expandable liner. Based on this, expandable liner drilling is the best option for using expandable casing.