Calculation Method of the Phase Recovery of Gas Cap Reservoir with Bottom Water
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsReview Comments
In this manuscript, the authors have proposed a calculation method for the split-phase recovery degree of gas top reservoir with bottom water. Overall, the writing in this manuscript is good, and the topic should be interesting for potential readers. And, I would recommend a major revision before its publication.
Detailed comments are listed as follows:
1) For the relationship between pressure and fluid properties shown in Eqs. (23)-(25), please provide corresponding figures to better illustrate this relationship.
2) In Figure 3, the term "actual measured formation pressure" is not suitable since "the actual ground pressure" is calculated using the method provided in this work, not directly measured.
3) Actually, for the average pressure calculation, significant work has been done that introduced the term "investigation radius." Therefore, only the range within the investigation will be conducted, and the investigation radius will change with time. Have the authors considered this concept to better complete the method proposed in this work?
4) Please provide references for the formulas that were not derived by the authors themselves.
5) Please provide a flowchart of the algorithm in this article to facilitate reader understanding.
6) Please provide nomenclature for the parameters used in this work to enhance manuscript readability.
7) The English usage needs significant improvement due to obvious typos, grammatical errors, and ambiguous statements throughout the manuscript. I recommend proofreading with the assistance of a native speaker.
Comments on the Quality of English LanguageThe English usage needs significant improvement due to obvious typos, grammatical errors, and ambiguous statements throughout the manuscript. I recommend proofreading with the assistance of a native speaker.
Author Response
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Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsPlease find the attached annotated pdf file for detailed comments. some of the key areas of comments and major suggestions are as follows:
Abstract section
1. start the abstract section with the significance of gas top reservoirs with bottom water and highlight the challenges associated with them
2. first state the aim of the study and then enlist the multiple objectives of the work
3. Lines 15-21 revise the sentence for clarity.
4. mention the precise percentage of reliability of your findings
Introduction section
5. include a generalized statement regarding the presence of a petroleum reservoir in the sedimentary basin with various depositional and diagenetic heterogeneities that determine the reservoir characterization and formation pressure
Facies Heterogeneity and Lobe Facies Multiscale Analysis of Deep-Marine Sand-Shale Complexity in the West Crocker Formation of Sabah Basin, NW Borneo. Applied Sciences 11. doi:10.3390/app11125513
6. Lines 53-89: split the literature review paragraph into multiple paragraphs each discussing the material balance equation, production dynamic data, and prediction of formation pressure.
7. include a table for comparison of various literature for the calculation of formation pressure
Results and Discussion section
8. split the section into two for results and discussion parts of the manuscript
9. The discussion section should have multiple subsections for formation pressure, accuracy of the proposed model, and comparison curves
general comment
10. similarity index excluding bibliography is high. reduce the similarity index of the manuscript
Comments for author File: Comments.pdf
the abstract and introduction sections contain complex structures and vague statements as mentioned in the annotated review file. rephrase them accordingly. for details please see the attached annotated file.
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for Authors1 The method integrates water intrusion prediction with the material balance equation effectively. Future work could benefit from external validation using field data from different geological settings to enhance the robustness and applicability of the model.
2 It's recommended to conduct a sensitivity analysis on key parameters (e.g., water intrusion rate, formation pressure) to understand their impact on recovery degree calculations and model reliability.
3 While the study compares its results with numerical simulation software, a more extensive comparison with other existing models could provide deeper insights into the advantages and potential limitations of the proposed method.
4 An analysis of the economic implications of using the proposed method in field operations, considering the reduction in economic losses from well shutdowns, would be beneficial for industry stakeholders.
5 Exploring advanced computational techniques, such as machine learning, could refine the prediction of water intrusion amounts and potentially improve the accuracy of recovery degree calculations.
6 The study focuses on gas-top reservoirs with bottom water. Extending this methodology to more complex reservoir configurations, such as those with heterogeneous rock properties or multiple fluid phases, could significantly widen the method's utility.
Author Response
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Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
Comments and Suggestions for AuthorsMost of the comments have been addressed. I do appreciate the effort on revision of the manuscript and addressing reviewers' concerns. And, I recommend the manuscript for publication in its present form.
Comments on the Quality of English LanguageMinor editing of English language required. Some typos, grammatical errors can be found in the current manuscript.
Author Response
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Author Response File: Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsPlease do the following modifications:
1. add the keywords: "hydrocarbon reservoirs".
2. Redraw Figure 1 with multiple colors for oil gas and water.
3. Revise the Figure 3, 4, and 5 captions for an explanation and description of the illustration.
4. Figure 6 caption should be explained separately for each a b and c part showing the cross plot.
5. Brief the conclusion section as it is too lengthy.
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for AuthorsGood to go now.
Author Response
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Author Response File: Author Response.pdf
