1. Peter the Great Saint Petersburg Polytechnic Univ., St. Petersburg, RU 195251 (Corresponding author), e-mail: kazakov@thixomet.ru
2. Weatherford International, St. Petersburg, RU
3. Weatherford International, Houston, TX US
4. NPO TsNIITMASh (Machine Building Technology), Sharikopodshipnikovskaya, Moscow, RU