Klymenko S. Information technology of ultrasound technical diagnostic of drilling pipes in process of their exploitation

Object: two-step technology of ultrasound technical diagnostic and monitoring of drilling pipes in the process of their exploitation. Goal: perfecting and implementing into practice modern information technologies for processing measurements of ultrasound technical diagnostic and forming data for decision making in the process of monitoring the state of drilling pipes. Methods: statistical theory of data recognition, mathematical and statistical methods, theory of computer calculation experiments. Proposed is a new two-channel method of measuring and complex processing of luna-signals for minimizing the influence of modulating interference on the effectiveness of ultrasound technical diagnostic of condition of drilling pipes. Researched is the effectiveness of optimal deciding rules for determining defects using minimum risk criteria and Newman-Pearson method. Proposed is two-step method of diagnostic of drilling pipes and new method of nonstandard processing of measurements and forming of data to support the decision regarding the condition of pipes. Developed is the new information technology of computer monitoring of technical state of drilling pipes based on summary differentiated wavelet transformation of luna-signals, which includes nonstandard multiple threshold method of valuation of defects of each area of the pipe and method of determining micro structural changes of metal based on nonparametric statistics of movement and Klotz and Bush-Wind scale. Results of the research are used in development of systems of automated ultrasound technical diagnostic and monitoring of the drilling pipes and implemented in production.