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Advanced Computational and Experimental Methods for Subsurface Energy Systems: From...
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Advanced Computational and Experimental Methods for Subsurface Energy Systems: From Drilling Optimization to CO2 Storage

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Petroleum and Low-Carbon Energy Process Engineering".

Deadline for manuscript submissions: 31 July 2026 | Viewed by 4671

Editors

Dr. Fei Yin

E-Mail Website
Guest Editor
College of Energy, Chengdu University of Technology, Chengdu 610059, China
Interests: drilling; well integrity; geomechanics
Prof. Dr. Dezhi Zeng

E-Mail Website
Guest Editor
State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
Interests: oil country tubular goods engineering; corrosion and protection in oil and gas fields; wellbore integrity
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Subsurface energy systems are the main source of global energy supply and are of vital importance to economic development and people's lives. As more efforts are made to explore unconventional, deep-earth, deep-sea and geothermal energy resources, the difficulty of subsurface energy development has increased. The advanced computational and experimental methods can help scholars to understand the geological characteristics and scientifically design development plans. They have promoted the safe and efficient development of subsurface energy systems.

This Special Issue on “Advanced Computational and Experimental Methods for Subsurface Energy Systems: From Drilling Optimization to CO2 Storage” aims to cover recent advances in the computational and experimental methods for subsurface energy systems. In this Special Issue, original research articles and reviews are welcome. Topics include, but are not limited to, the following areas:

  1. Drilling optimization;
  2. Intelligent drilling and well completion;
  3. Geomechanics;
  4. Oil and gas reservoir stimulation and development;
  5. Well integrity;
  6. Geothermal energy development;
  7. CCUS;
  8. Underground energy storage.

Dr. Fei Yin
Prof. Dr. Dezhi Zeng
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Processes is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • subsurface energy
  • computational and experimental methods
  • drilling
  • geomechanics
  • reservoir stimulation
  • oil and gas reservoir
  • well integrity
  • geothermal energy
  • CCUS

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Published Papers (3 papers)

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Research

16 pages, 2851 KB  
Article
Comparison of Mathematical and Intelligent Prediction Models of Directional Wellbore Collapse
by Yu Fan, Weian Huang, Xihui Hu, Qiutong Wang, Yijia Tang and Hao He
Processes 2026, 14(10), 1648; https://doi.org/10.3390/pr14101648 - 20 May 2026
Viewed by 273
Abstract
Given the great burial depth, ancient depositional age, and multi-phase tectonic evolution of deep formations, drilling operations are highly susceptible to wellbore instability. The design and deployment of directional wells further exacerbate this risk, underscoring the need for quantitative risk assessments for directional [...] Read more.
Given the great burial depth, ancient depositional age, and multi-phase tectonic evolution of deep formations, drilling operations are highly susceptible to wellbore instability. The design and deployment of directional wells further exacerbate this risk, underscoring the need for quantitative risk assessments for directional drilling operations. Based on linear poroelasticity theory, a mechanical model for directional wellbore stability is established to enable wellbore stability evaluation and trajectory optimization design. Furthermore, an intelligent prediction method for collapse pressure is proposed using the XGBoost algorithm. The results indicate that the prediction accuracy of collapse pressure reaches 93%. Under strike-slip in situ stress regimes, wellbore stability is most critical for vertical wells, whereas horizontal and directional wells exhibit lower collapse pressure. The optimal wellbore trajectory is determined to be a horizontal well with an azimuth approximately 36° deviated from the maximum horizontal principal stress direction. The intelligent prediction results show a 98% goodness-of-fit with theoretical calculations, reducing the calculation time from hours to seconds. This study provides a novel approach for wellbore stability analysis and offers a practical tool for the rapid risk assessment of wellbore collapse during directional drilling operations. Full article
(This article belongs to the Special Issue Advanced Computational and Experimental Methods for Subsurface Energy Systems: From Drilling Optimization to CO2 Storage)
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21 pages, 6694 KB  
Article
Study on Time-Dependent Load Characteristics of CO2 Fracturing Tubing Considering Multi-Field Coupling Effects
by Wenlan Wei, Yuqiang Li, Jiarui Cheng, Xinyang Guo, Xueer Fan, Pengju Bai and Kaixing Zhang
Processes 2026, 14(1), 70; https://doi.org/10.3390/pr14010070 - 24 Dec 2025
Viewed by 603
Abstract
The complex changes in fluid phase behavior during the CO2 fracturing process result in significantly different temperature-pressure coupling characteristics compared to hydraulic fracturing. The complex temperature-pressure changes make it difficult to obtain a rapid and effective evaluation between fracturing parameters and string [...] Read more.
The complex changes in fluid phase behavior during the CO2 fracturing process result in significantly different temperature-pressure coupling characteristics compared to hydraulic fracturing. The complex temperature-pressure changes make it difficult to obtain a rapid and effective evaluation between fracturing parameters and string safety. To solve this problem, considering the flow and heat transfer of CO2 and the change of phase state, and then considering the deformation of string load under the constraint of packer, this study established the thermal fluid mechanical coupling analysis model of CO2 fracturing process, realized the dynamic analysis of string load in the whole process of fracturing, systematically revealed the evolution law of string stress in the process of fracturing, and provided theoretical basis and technical support for the optimization of CO2 fracturing process parameters and the safety design of string. The research results show that with the fracturing process, the temperature, pressure, and flow rate distribution of the medium in the wellbore have significant nonlinear characteristics, and the string load increases slowly at first and then increases rapidly. The reduction of CO2 fracturing temperature or the increase of pressure will significantly increase the string load. The findings provide direct theoretical and technical support for optimizing CO2 fracturing parameters and ensuring tubing safety in engineering practice. Full article
(This article belongs to the Special Issue Advanced Computational and Experimental Methods for Subsurface Energy Systems: From Drilling Optimization to CO2 Storage)
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19 pages, 6654 KB  
Article
Corrosion Failure Analysis of a Pressure-Resistant Cylinder for Measurement While Drilling Tools in Directional Drilling
by Yufei Wang, Xin Chen, Wei Chen, Wenxue Pu, Jiaxin Zeng, Jiancheng Luo, Hanwen Zhang and Dezhi Zeng
Processes 2026, 14(1), 45; https://doi.org/10.3390/pr14010045 - 22 Dec 2025
Cited by 2 | Viewed by 1080
Abstract
During the drilling operations of a shale gas well in Central China, a severe failure occurred in the pressure-resistant cylinder of the measurement while drilling (MWD) tool, with numerous microcracks observed on the outer surface of the cylinder. This significantly compromised the safety [...] Read more.
During the drilling operations of a shale gas well in Central China, a severe failure occurred in the pressure-resistant cylinder of the measurement while drilling (MWD) tool, with numerous microcracks observed on the outer surface of the cylinder. This significantly compromised the safety of the MWD tool and the reliability of the logging data. To determine the cause of the failure, macroscopic morphology analysis and physicochemical performance tests were conducted on the failed pressure-resistant cylinder, which is made of Cr20Ni11 (UNS 308) austenitic stainless steel. Additionally, scanning electron microscopy, X-ray energy dispersive spectroscopy, white light interferometry, and X-ray photoelectron spectroscopy were employed to analyze the morphology and chemical composition of the corrosion products and cracks, thereby identifying the cause of the corrosion failure. It is demonstrated that the physicochemical properties of the pressure-resistant cylinder comply with the specifications of relevant standards. Nevertheless, the size of non-metallic inclusions in the material reaches 100 μm, which significantly enhances the material’s susceptibility to stress corrosion cracking (SCC). Meanwhile, solid particles and high-concentration Cl− present in the drilling fluid deteriorate the passive film formed on the substrate surface. EDS analysis reveals that the Cl− content is measured to be 4.09 wt%, which induces pitting on the substrate with a maximum pitting depth of 13.5556 μm. Under the synergistic effect of stress and corrosion, the pressure-resistant cylinder experiences SCC failure initiated by Cl−; specifically, cracks nucleate at the bottom of the pitting pits and propagate along the radial direction. Full article
(This article belongs to the Special Issue Advanced Computational and Experimental Methods for Subsurface Energy Systems: From Drilling Optimization to CO2 Storage)
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