For information address: IHRDC, Publishers, 137 Newbury Street, Boston, MA 02116. No part of this book may be used or reproduced in any manner whatsoever without written permission of the publisher except in the case of brief quotations embodied in critical articles and reviews. Softcover reprint ofthe hardcover 1st eiditon 1985 Reidel Publishing Company A Member of the Kluwer Academic Publishers Group DordrechtiBostoniLancaster International Human Resources Development Corporation Theory and Application of Drilling Fluid Hydraulics Written and Compiled by EXLOG Staff Edited by Alun Whittakerĭ. The EXLOG Series of Petroleum Geology and Engineering Handbooks THEORY AND APPLICATION OF DRILLING FLUID HYDRAULICS Thus, drilling hydraulics is a very impor tant subject with which all logging geologists should be familiar. THEORY AND APPLICATION OF DRILLING FLUID HYDRAULICS 1 INTRODUCTION To dri 11 a we 11 safely and succes sfull y depends upon a thorough unders tandi ng of drilling hydraulics principles. Appendix D contains example hydraulics calculations. In Appendix C, all the important equations are given in both S.1. Nomenclature is explained after every equation when necessary, and a comprehensive list of the nomenclature used is given in Appendix A. units some common expressions are also given in oilfield units. Equations are given generally in consistent S.1. The units and nomenclature are consistent throughout the manual. References are presented at the end of each section. Chapters 3 through 10 analyze specific hydraulic considerations of the drilling process, such as viscometric measurements, pressure losses, swab and surge pressures, cuttings transport and hydraulic optimization. Chapter 1 introduces the basic principles of fluid properties, and Chapter 2 presents the general principles of fluid hydraulics. Then we can figure out the critical flow rate.The objectives of this book are (1) to serve as a reasonably comprehensive text on the subject of drilling hydraulics and (2) to provide the field geologist with a quick reference to drilling hydraulics calculations. Power law constant (consistency factor), Ka = 6.63ĭetermine the critical annular velocity by substituting factors into this equation. Power law constant (flow behavior index), na = 0.51 Please follow the step-by-step calculation to learn how to determine the critical flow rate. Ka = power law constant (consistency factor)Īfter we get the critical velocity, we can figure out the critical flow rate by the following equation. Na = power law constant (flow behavior index) Μea = effective viscosity in the annulus, centi-poise The critical annular velocity equation is listed below: The Reynolds number equation for critical velocity is listed below: The effective viscosity equation for critical velocity is listed below: With this relationship, we can determine the critical velocity by rearranging the Reynold Number and Effective Viscosity equation. To get the point at the transition period, the critical Reynold Number for laminar flow must be around 3470 – 1370na. The first step of the critical flow rate determination is to figure out the critical velocity and then substitute it into the annular flow rate. Critical flow rate is the flow rate at the transition point between laminar and turbulent flow.
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