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Arabian Journal for Science and Engineering

, Volume 44, Issue 12, pp 10231–10244 | Cite as

Dynamic Research and Experimental Analysis of a New Downhole Drilling Tool

  • Jialin TianEmail author
  • Lai WeiEmail author
  • Tangjia Zhang
Research Article - Mechanical Engineering
  • 93 Downloads

Abstract

With the increasing of drilling depth, the working conditions of the drilling engineering are becoming more complicated. When drilling in the complex well structure, there are many new problems or challenges such as low rate of penetration (ROP), serious stick–slip phenomenon, or high risk of downhole tools failure. The most critical factor in solving these new challenges is improving rock breaking efficiency. Considering this, this paper proposed a new oscillator based on the positive displacement motor. Combining with new complex drilling conditions, the new structure was designed. The mathematical models were presented, including the working mechanism of the new design with its structure parameters. Furthermore, the theoretical models of dynamics under new conditions were analyzed, including the new bottom hole assembly. Based on this, we can get the vibration displacement, velocity, and the system vibration spectrum at different drill string positions. Compared with the results of a numerical example, the lab test was carried out. The two important parameters of vibration frequency and impact forces were compared with the theoretical results, which verified the correctness of the theoretical model and the accuracy of the solution method. Moreover, field experiments were also tested to verify the results, and the field experimental data showed that the new design could increase ROP obviously. The method and conclusions of the research can provide a new reference for the new downhole technology of enhancing the ROP or improving the rock breaking efficiency in complex well structure.

Keywords

Vibration Drilling Dynamics Downhole tool Rate of penetration (ROP) Rock breaking Test analysis 

Abbreviations

PDC

Polycrystalline diamond compact

ROP

Rate of penetration

WOB

Weight on bit

BHA

Bottom hole assembly

HWDP

Heavy weight drill pipe

Notes

Acknowledgements

All authors gratefully acknowledge the support of the Open Fund of Key Laboratory of Oil & Gas Equipment (OGE201701-02), Ministry of Education (Southwest Petroleum University), The State Scholarship Fund of the China Scholarship Council (CSC) (No. 201608515039), National Natural Science Foundation of China (NSFC) (No. 51674216), National Science and Technology Major Project (No. 2016ZX05038).

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Copyright information

© King Fahd University of Petroleum & Minerals 2019

Authors and Affiliations

  1. 1.Key Laboratory of Oil and Gas Equipment Ministry of Education, School of Mechanical EngineeringSouthwest Petroleum UniversityChengduChina

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