TY - JOUR ID - 108468 TI - Development of Mathematical Model for Controlling Drilling Parameters with Screw Downhole Motor JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Dvoynikov, M. AU - Kunshin, A. AU - Blinov, P. AU - Morozov, V. AD - Department of Wells Drilling, Saint-Petersburg Mining University, Saint-Petersburg, Russian Federation Y1 - 2020 PY - 2020 VL - 33 IS - 7 SP - 1423 EP - 1430 KW - drilling control KW - drilling dynamics KW - Directional Drilling KW - horizontal well KW - bit shock KW - bit vibration DO - 10.5829/ije.2020.33.07a.30 N2 - Present article results of study on possibility of increasing the efficiency of drilling directional straight sections of wells using screw downhole motors (SDM) with a combined method of drilling with rotation of drilling string (DS). Goal is to ensure steady-state operation of SDM with simultaneous rotation of DS by reducing the amplitude of oscillations with adjusting the parameters of drilling mode on the basis of mathematical modeling for SDM – DS system. Results of experimental study on determination of extreme distribution of lateral and axial oscillations of SDM frame depending on geometrical parameters of gerotor mechanism and modes ensuring stable operation are presented. Approaches to develop a mathematical model and methodology are conceptually outlined that allow determining the range of self-oscillations for SDM – DS system and boundaries of rotational and translational wave perturbations for a heterogeneous rod with an installed SDM at drilling directional straight sections of well. This mathematical model of SDM – DS system's dynamics makes it possible to predict optimal parameters of directional drilling mode that ensure stable operation of borehole assembly. UR - https://www.ije.ir/article_108468.html L1 - https://www.ije.ir/article_108468_c7e778a542bc2c3bee32eb24745b19f3.pdf ER -