Type Curves for Predicting Directional Tendencies of Simple Bottom-Hole Assemblies

[+] Author and Article Information
S. Miska

Department of Engineering, University of Tulsa, Tulsa, OK 74104

J. Rajtar, F. Luo

Department of Petroleum and Chemical Engineering, New Mexico Institute of Mining and Technology, Socorro, NM 87801

J. Energy Resour. Technol 120(3), 193-200 (Sep 01, 1998) (8 pages) doi:10.1115/1.2795035 History: Received April 30, 1996; Revised April 20, 1998; Online November 06, 2007


The paper provides solutions for predicting directional tendencies of slick and single stabilizer bottom-hole assemblies (BHA) in curved boreholes. Solutions are derived in a curvilinear system of coordinates in a dimensionless form. These solutions are presented in the form of type curves. Type curves allow for quick evaluation of directional tendencies of a given BHA by providing values of side force and tilt angle at the bit. Using these values an anticipated direction of bit displacement is evaluated, using concepts of formation anisotropy index (FAI) and bit anisotropy index (BAI). Procedures are illustrated by examples of evaluation of side force and tilt at the bit for a slick and single stabilizer BHA. The resulting bit displacements are calculated assuming formation anisotropy and drill bit directional tendencies (FAI and BAI). The results derived from type curves are in agreement with computer simulated data. The comparison shows that application of graphical solutions (type curves) yields only slight error that can be ignored for practical purposes.

Copyright © 1998 by The American Society of Mechanical Engineers
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