Journal of Applied Science and Engineering

Published by Tamkang University Press


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Heng Wang This email address is being protected from spambots. You need JavaScript enabled to view it.1, Zhi-Chuan Guan1, Yu-Cai Shi1 and De-Yang Liang1

1School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P.R. China


Received: March 3, 2017
Accepted: April 27, 2017
Publication Date: September 1, 2017

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Rotary steerable drilling is an effective technique for drilling directional wells. Given the currently inadequate understanding about the variation of build-up rate for rotary steerable bottom hole assembly under different drilling condition, a build-up rate prediction model needs to be established. Aimed at push-the-bit rotary steerable bottom hole assembly, a continuous beam model was applied to study the mechanical properties. Further considering drill bit cutting anisotropy, the build-up rate prediction method was built. Effects of configuration parameters on build-up rate were analyzed. Results showed that build-up rate decreases with the increasing of distance between bit and steering pads. There was an optimal distance between bit and near-bit stabilizer to obtain a maximum build-up rate. With lower flexural rigidity and longer length of flex sub, the build-up rate is much higher. Smaller diameter of near-bit stabilizer diminished build-up rate. However, smaller diameter of upper stabilizer improved build-up rate. And build-up rate became bigger when distance between the two stabilizers extended. The study can provide theoretical basis for optimal configuration design of push-the-bit rotary steerable bottom hole assembly to get higher steering ability.

Keywords: Rotary Steerable Drilling, Mechanical Property, Cutting Anisotropy, Build-up Rate, Configuration


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