ABOUT DIFFERENT APPROACHES TO USING MILLING TOOLS

The article establishes that the creation of small channels from a cased well with a given radius of curvature along a pre-planned trajectory remains an urgent direction for restoring abandoned wells and increasing oil recovery from old fields. Information about a downhole milling tool for milling a "window" in an operational column and subsequent drilling of channels using special small-sized screw downhole motors is reviewed. The scientific and technical information has been analyzed and it has been established that the relevant directions are the development of new and improvement of well-known tool structures for milling "windows" in casing columns of various strength groups. The prospect of monitoring the parameters of deep-sea equipment throughout its use through statistical analysis of time series, including changes in the technological parameters of milling, is investigated. The general information on the use of fluctuations in the technological parameters of the axial load on the milling tool and the pressure of the flushing liquid during the milling process, presented as a random process, is considered. The well-known criteria for indirect assessment of the technical condition of deep-sea equipment are analyzed, and it is determined that the condition of independence must be fulfilled when using them. It has been established that an important direction is the development of a new criterion for diagnosing a working condition for the subsequent creation of an automated system for monitoring and evaluating the technical condition of equipment, including the possibility of predicting wedging and jamming of a special small-sized screw downhole engine.