Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process

Deyang Liang,Zhichuan Guan,Yuqiang Xu,Yongwang Liu

doi:10.3389/feart.2021.799061

Deyang Liang, Zhichuan Guan + Show 2 more

Open Access

https://doi.org/10.3389/feart.2021.799061

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Abstract

Using various tools to obtain downhole data to reach a precise pore pressure model is an important means to predict overpressure. Most downhole tools are connected to the lower end of drill string and move with it. It is necessary to understand the motion state and dynamic characteristics of drill string, which will affect the use of downhole tools. In this paper, a drilling process considering rock-breaking process in vertical wells is simulated using finite element method. In the simulation, gravity is applied to the whole drill string. The contact force between PDC bit and formation is the weight on bit (WOB). And a rotation speed is applied to the upper end of drill string. Analysis of the results shows that the vibration amplitude of bottom hole WOB (contact force between PDC bit and formation, which is the real WOB in drilling process) is bigger than the amplitude of wellhead WOB (acquired through conversion using Hook load, which is on behalf of the WOB obtained on drilling site). Both wellhead WOB and bottom hole WOB decline with a fluctuation in drilling process. In small initial WOB and low rotation speed conditions, the fluctuation of wellhead WOB focuses on low frequency, the fluctuation of bottom hole WOB focus on high frequency, and the phase of them are not identical. In large initial WOB and high rotation speed conditions, the fluctuation of wellhead WOB and bottom hole WOB both become more irregular. As for wellhead torque and bottom hole torque, the fluctuation of them mainly focuses on low frequency. And in high rotation speed conditions, wellhead torque may become negative. The research results are beneficial to the usage of downhole tools.

Highlights

Overpressure may cause various downhole accidents in oil industry
The rotation speed at the lower end of drill string fluctuates around the rotation speed at the upper end, and the maximum rotation speed at the lower end of drill string is about twice the rotation speed at the upper end
When the rotation speed at the upper end is low, the rotation angle at the lower end is always smaller than the rotation angle at the upper end

Summary

Introduction

The precise pore pressure model can be obtained through the downhole data measured by various tools to predict overpressure. Most downhole tools are connected to the lower end of drill string and move with it. Understanding the movement and dynamic characteristics of drill string is necessary. The essence of drill string vibration is a structural dynamics problem under prescribed boundary conditions and exterior excitations when the whole drill string is regarded as the study object. In terms of the complexity of the model, most of the early models are uncoupled vibration models, like axial (Lubinski, 1988; Elsayed and Phung, 2005; Li et al, 2007), lateral (Beck and da Silva, 2010; Ghasemloonia et al, 2012) and torsional

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