Research Papers: Petroleum Wells-Drilling/Production/Construction

Mathematical Models for 3D Analysis of Rotary Steering BHA Under Small Deflection

[+] Author and Article Information
Li Zifeng

Petroleum Engineering Institute, Yanshan University, Qinhuangdao 066004, Chinazfli@ysu.edu.cn

Li Jingyuan

Petroleum Engineering Institute, Yanshan University, Qinhuangdao 066004, Chinazfli@ysu.edu.cn

J. Energy Resour. Technol 130(1), 013101 (Jan 25, 2008) (7 pages) doi:10.1115/1.2824261 History: Received November 17, 2005; Revised November 04, 2007; Published January 25, 2008

A new type of rotary steering stabilizer used in a common rotary bottom hole assembly (BHA) to control well path was developed. In order for design and use of this kind of BHA, mathematical models were proposed for 3D mechanical analysis of rotary steering BHA with small deflection. The mathematical models include (1) differential equations; (2) boundary conditions of drill bit, stabilizer, diameter change, tangent point, and bore hole wall; (3) methods for calculating lateral forces and deflection angles of the bit; and (4) models for determining navigation ability and navigation parameters. As an example, a given rotary steering BHA was studied.

Copyright © 2008 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Coordinate systems

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Figure 2

Bottom hole assembly

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Figure 3

Eccentricity of stabilizer

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Figure 4

Well path curvature and its direction versus eccentric and its direction



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