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Applied Sciences
Volume 12
Issue 20
10.3390/app122010356
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Communication
Peer-Review Record

A New Mechanical Specific Energy Model for Composite Impact Drilling

Appl. Sci. 2022, 12(20), 10356; https://doi.org/10.3390/app122010356
by Jianyu Qin 1, Siyuan Yin 2,*, Naitong Yang 3, Xuyue Chen 2, Bo Tian 1, Liang Xue 1 and Yi Ma 1
Reviewer 1: Anonymous
Reviewer 2:
Virgil Teodor
Appl. Sci. 2022, 12(20), 10356; https://doi.org/10.3390/app122010356
Submission received: 1 September 2022 / Revised: 7 October 2022 / Accepted: 11 October 2022 / Published: 14 October 2022
(This article belongs to the Special Issue Geomechanics and Reservoirs: Modeling and Simulation)

Round 1

Reviewer 1 Report

1.     Need to specify what is the role of the hammer in this context. What is the total impact energy generated by HPG impactor, when working at maximum operating temperature?

2. How rock breaking efficiency is dependent on ROP and WOB? Other factors, like rock stiffness and area of cross-section, also affect the overall MSE or not? 

3. On what factors mostly drilling speed dependent? WOB is also related to the friction of the surface, What is the reason behind it?

4. Are the dimensions of the impactor scaled or actual? If they are actual, losses in the head are calculated or not? 
5. These monitoring do not appear realistic. There is so far no discussion to explain how these dimensions were selected.  It is imperative that a discussion/justification of how the dimensions were selected is included.
6. What kind of real loading condition is the impactor supposed to model?
7. From Figure 5, it appears that the impactor hits the rock profile and MD is showing from 2300 mt. What happens between 0-2300mt. it should be explained in a sentence or two. This should be stated in the text when the impactor is discussed.

8. The authors need to present some more experimental data in this paper and discuss the comparisons.

9. For which specific rock strength, this efficiency will increase. Any limitations if it had?

10. What is the unit of deformation?  At what instant of time since the impact is the deformation depicted in figure.5?
11. What is the significance of CCS and CCN in the present study? It should be included somewhere.

Author Response

Please see the attachment

Author Response File: Author Response.docx

Reviewer 2 Report

Related drilling technologies are a topical concern of researchers in the field.

The work has practical applicability, and the proposed topic is worth studying.

Regarding the formatting of papers, I recommend that the positioning of the formulas be done so that the sequence number of the equation remains on the right side of the page (see equations 4-14).

I suggest that at the first use of abbreviations (HPG, PDC, etc.), even for common notions, the full name of the respective notions should also be mentioned.

Author Response

Please see the attachment

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