Study on Build-up Rate of Push-the-bit Rotary Steerable Bottom Hole Assembly

Heng Wang; Zhi-Chuan Guan; Yu-Cai Shi; De-Yang Liang

doi:10.6180/jase.2017.20.3.15

Study on Build-up Rate of Push-the-bit Rotary Steerable Bottom Hole Assembly

Physics

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

Download Citation: ||https://doi.org/10.6180/jase.2017.20.3.15

ABSTRACT

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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