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The paper considers improvement of screw dies of mobile coiled tubing unit injector through the change in screw die's design parameters with further mounting of metal-ceramic based friction material. Comparison of designs of unit injector screw dies was carried out and reliability evaluation of an improved coiled tubing transporter unit was executed. © 2017 Published by Faculty of Engineering Corresponding author: Nikita Olegovich Kovalev Ufa State Petroleum Technological University, Oktiabrski Branch 54a Devonskaia str., Oktiabrski, Republic of Bashkortostan, Russia 452620 E-mail: editor3@academicpapers.org

Reliability Evaluation for Improved Screw Dies of Coiled Tubing Unit Injector