Failure Analysis of Drill Pipe during Working Process in a Deep Well: A Case Study
Round 1
Reviewer 1 Report
The paper is nicely written. However, the analysis and results can be bit more organized.
One point of discussion missing is the damage during making up and breaking out these pipe joints. Different rigs use different tools to torque and un-torque the pipe joints. They use different materials to hold pipe joints. Having a discussion on this part would make this paper much better.
Author Response
Thank you for your valuable comments. Please check the Respons Letter for our detailed reply and revision.
Author Response File: 
Author Response.docx
Reviewer 2 Report
minor revisions to improve readability of the paper. scientific soundness in the exhbited content
Author Response
Thank you for your valuable comments. Please check and see the The attachment-Respons Letter for our detailed reply and revision
Author Response File: Author Response.docx
Reviewer 3 Report
Reviewing report for the Manuscript ID: processes-1834723
The authors reported used experimental test and finite element simulation to investigate the failure of a 101.6mm drill pipe. The authors in this study performed the macro analysis, metallographic structure and energy spectrum, chemical composition, and mechanical property test of the failed drill pipe sample. Then, they utilized a three-dimensional finite element model of drill pipe failure based on the experimental results. In the last section, they analyzed the failure mechanism of drill pipe. The results showed that solids settling sticking was the direct cause of fracture failure of drill pipe joint.
Generally, the findings of this study are interesting, and the data are clearly discussed, however, there are revisions should be made for this manuscript to accepted for publication in “Processes”. The suggested revisions are noted below:
1. The authors needs to show the novelty of this work.
2. In Figure 5, the title of Y-axis of the lower curve should be clearer.
3. In Figure 8a, the resolution is poor, it is recommended to be higher.
Comments for author File: Comments.docx
Author Response
Thank you for your valuable comments, please see attached - our one to one response
Author Response File: Author Response.docx
Reviewer 4 Report
In this manuscript, the failure of a 101.6mm drill pipe is studied by using a combination of experiments and finite element simulations. The author analyzed the failure mechanism of drill pipe and proposed some corresponding mitigation measures. It has certain practical significance in engineering. But there are still some problems.
Firstly, the abstract and introduction sections do not reflect the importance and innovation of this research. Besides, the review in the introduction section is poor. Some important literature is still missing. I strongly recommend the author study this drill pipe failure analysis review paper: https://doi.org/10.1016/j.engfailanal.2015.10.012. What’s more, when establishing the finite element model, what’s the value of the friction coefficient? Whether confirmatory experiment can be performed to demonstrate the correctness of the model? Finally, I thought if the authors can study the proper drilling time and provide exact guidance for the engineering will make the content of this research better.
Author Response
Thank you for your valuable comments, please see attached - our one to one response
Author Response File: Author Response.docx
Round 2
Reviewer 1 Report
Dear Authors,
Thanks for taking care of the comments and suggestions. I approve the paper for publishing.
Reviewer 4 Report
My doubts have been answered by the authors, and I am satisfied with these answers. I think the quality of this manuscript has reached the standard published in the process journal. Recommended for publication.
