TY - JOUR AU - Moishyshyn, V. M. AU - Biletskii, Y. S. AU - Vryukalo, V. V. AU - Seniushkovych, M. V. PY - 2018/12/14 Y2 - 2024/03/29 TI - TO A QUESTION OF DETERMINATION OF HYDRAULIC RADIUS OF A BACKFILL FLOW FOR THE EXCENTRATIVE PLACEMENT OF PIPES IN DRILLING BORE: Array JF - PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number JA - Number VL - IS - 2(46) SE - Oil and Gas Industry DO - 10.31471/2304-7399-2018-2(46)-197-209 UR - https://pvntsh.nung.edu.ua/index.php/number/article/view/384 SP - 197-209 AB - <p>The processes of displacement of drilling clay backfill flow from the&nbsp;intertubular space formed by internal surface of external and external surfaces of inner tubes are considered. In case of eccentric placement of pipes it&nbsp;is proposed in the form of a cross-section of the flow of a backfill to take the area limited from the outside by the Pascal's snail, and from the inside - the outer surface of the inner pipe at the first time.</p><p>The formulas for determining areas of the cross section of the flow and the stagnant zone, the perimeter and the hydraulic radius of the section of<br>the flow for the eccentric placement of the pipes in the bore are proposed.&nbsp;The dimensionless parameter α is introduced as the ratio of the centripetal distance to difference between internal radius of outer pipe and&nbsp;outer radius of inner tube. It was found that with increasing of α cross-sectional area and their hydraulic radii are increasing, and the area of&nbsp;stagnant zones decreases according to parabolic laws.<br>It is established that with the growth of α velocity of the backfill flow decreases according to parabolic laws and their values are in good agreement with the experimental data.</p> ER -