DOUBLE DRILL STRING AS AN OPTIMAL OBJECT FOR MATHEMATICAL MODELING

Abstract

In order to simplify the task of constructing a mathematical model of a drilling machine with a drill string and increase its reliability, the main methods of drilling deep wells and the possible loads on the drill string that it experiences as it deepens are considered. The main task was to establish the most appropriate design of the drill string, where the influence of external factors acting on the string would be the least, which would significantly simplify the mathematical model, and hence increase the reliability of calculations of the behavior of the drill string under changing drilling conditions and the length of the drill string. Such a tool has a double separately driven drill string, in which the entire load on the bottomhole is transmitted through the inner drill string installed in bearing supports relative to the outer pipe. For such a projectile, the construction of a mathematical model of a drilling machine with an engine, transmission and drill string is greatly facilitated, since there are no unknown and indeterminate factors that affect the drilling process and the behavior of the drilling tool in the well. The use of a double string allows not only to reduce energy consumption for drilling, but also to eliminate sudden changes in engine loads, which is very important when using an electric drive.