**1. Introduction**

The increased depth of drilling over 4500 m has affected the complexity of drilling operation as well as drilling rigs and their practices. Due to this, modern drilling technologies are designed to increase the capacity of drilling equipment. Because the possibility of increasing the drive power is quite limited and economically impractical, the application of alternative materials such as aluminum alloys becomes the most cost-effective and relevant target [1]. For instance, drilling deep, ultra-deep, and especially horizontal wells is extremely important to ensure the high operational reliability of drill string, to reduce its stress-strain state, and to ensure trouble-free operation at extreme loads and high temperatures. Drill string assembly and its weight significantly affect the technical and economic parameters of the well drilling process, the behavior of resisting forces, and specify the level of load in the parts of a drilling rig.

Aluminum alloys possess several valuable physical and mechanical properties that favorably distinguish them from steel, which is a traditional material in the drill pipe. The following should be referred to as the basic properties of aluminum alloys:


Aluminum alloys are still of relatively limited use in drilling, since the temperature is of crucial importance here, since in deep wells, depending on the geological section, the temperature at 3500–7000 m can reach 42,315 K, and in some cases 52,315–82,315 K [2, 3] for example D16 and 1953 alloys. D16 alloy has high strength characteristics at room and elevated (up to 43,315 K) temperatures, medium ductility, but very low corrosion resistance in drilling fluids.


These properties of aluminum alloys specify the basic efficiency in light alloy aluminum drill pipe (LAIDP) application in drill strings while constructing oil and gas wells. Therefore, the work process in this paper is to first determine the limit up to which the aluminum drill pipe can drill without failures by means of the Decision Space Well Engineering software and second, point out the expected loads during drilling [5].
