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Geophysics, Geomechanics, Drilling Mechanics and Seepage Mechanics of Unconventional Oil and Gas Reservoirs

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H: Geo-Energy".

Deadline for manuscript submissions: closed (12 September 2023) | Viewed by 6343

Special Issue Editors

Dr. Qiangui Zhang

E-Mail Website
Guest Editor
School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
Interests: petroleum-related engineering mechanics (rock mechanics on wellbore stability, petroleum geomechanics, and hydraulics); rock mechanics and geotechnical engineering stability; theoretical and technical methods for the exploitation of unconventional oil and gas
Prof. Dr. Xiangyu Fan

E-Mail Website
Guest Editor
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
Interests: underbalanced drilling and reservoir evaluation while drilling; oil and gas well rock mechanics; complex drilling geological environment description and disaster prevention and control technology; application of measurement and logging technology in petroleum engineering
Dr. Yufei Chen

E-Mail Website
Guest Editor
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
Interests: unconventional reservoirs; fluid transport and flow modeling in shale; gas shale characterization; flow analysis and geomechanics

Special Issue Information

Dear Colleagues,

Unconventional oil and gas resources mainly contain heavy oil, tight sandstone gas, coalbed methane, shale gas, and gas hydrate, which have played more and more important roles in current energy consumption patterns due to their significant resource deposits. Unfortunately, there are still many scientific problems for developing unconventional oil and gas resources due to the complex geological features of reservoirs that are related to the areas involved in the evaluation of reservoir physical properties, the prediction of geomechanical parameters, well measurement and control, fluid transport characteristics, reservoir permeability improvement, etc. Thus, up until now, only a few unconventional oil and gas resources have been developed for industrial production. In fact, due to the application and development of information theory, cybernetics, and system theory, even the technologies involved in oil and gas exploitation, including geological exploration, drilling, logging, completion, stimulation operation, and acid fracturing processes have advanced from empirical to scientific methods. With the accelerated exploration and development of unconventional oil and gas resources, we still have to face the challenges of high-risk, low-efficiency, and high-cost due to the complex geological conditions, multi-physics, and multi-phase effects. Currently, thanks to the development and rapid technological progress, the above-mentioned challenges are expected to be further developed to ensure the safety, high-efficiency, and low-cost development of unconventional oil and gas resources.

This Special Issue will provide an opportunity for researchers to share their original research and review articles based on recent advancements in the geophysics, geomechanics, drilling mechanics, and seepage mechanics of unconventional oil and gas reservoirs. In particular, research using theoretical, computational, experimental, and/or methodological approaches in the analysis of the above-mentioned problems is welcome. Novel and practical case studies that consider extensive field applications with unconventional oil and gas exploration and development are also encouraged. Potential topics include but are not limited to the following topics:

  • The evaluation of unconventional oil and gas reservoirs, especially reservoir rock characterization, including multiscale pore structure and mineral fabric characteristics, and reservoir permeability evolution;
  • Unconventional oil and gas well drilling, especially drilling mechanics, wellbore stability, wellbore pressure control, drilling complicated prediction and control, drilling monitoring and control, and advanced drilling technologies;
  • Unconventional oil and gas well completion, especially mechanical problems related to novel completion technologies and wellbore integrity;
  • Unconventional oil and gas well logging, especially logging evaluation methods for the physical properties and geomechanical properties of reservoirs;
  • Unconventional oil and gas reservoir fracturing, especially fracture propagation characteristics and novel fracturing method-related rock mechanics.

Dr. Qiangui Zhang
Prof. Dr. Xiangyu Fan
Dr. Yufei Chen
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 100 words) can be sent to the Editorial Office for announcement on this website.

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-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies 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 2600 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

  • reservoir rock characterization
  • permeability evolution
  • in situ stress and pore pressure
  • natural fractures characterization and interaction with hydraulic fracturing
  • structural geomechanics, tectonics
  • seismic geomechanics
  • oil and gas well engineering mechanics
  • wellbore stability
  • oil and gas well drilling, completion, logging, and stimulation
  • wellbore integrity
  • flow modeling
  • hydraulic fracturing method
  • production and depletion geomechanics
  • fractures propagation characteristics
  • fluid transport characteristics
  • hydrate phase equilibria
  • temporal and spatial evolution law of reservoir physical properties
  • productivity test

Published Papers (4 papers)

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Research

20 pages, 3335 KiB  
Article
The Law of Liquid–Solid Carrying in the Wellbore of Natural Gas Hydrate Gas Well under the Condition of Foam Drainage Gas Recovery
by Haitao Li, Na Wei, Haiyu Hu, Zhaolong Ge, Lin Jiang, Fengjun Liu, Xiaoran Wang, Chao Zhang, Hanming Xu, Jun Pei and Bjørn Kvamme
Energies 2023, 16(5), 2414; https://doi.org/10.3390/en16052414 - 02 Mar 2023
Viewed by 1243
Abstract
During the trial production of marine gas hydrate in the former Soviet Union, Canada, North Slope of Alaska, South Sea Trough of Japan and Shenhu Sea of South China Sea, the problem of sand and water production cannot be avoided. The problems of [...] Read more.
During the trial production of marine gas hydrate in the former Soviet Union, Canada, North Slope of Alaska, South Sea Trough of Japan and Shenhu Sea of South China Sea, the problem of sand and water production cannot be avoided. The problems of sand production and water production in the process of natural gas hydrate depressurization exploitation have seriously restricted the exploitation efficiency and production of natural gas hydrate. The problems of sand production and water production are some of the main factors that prevent natural gas hydrate being commercially exploited. Therefore, it is urgent to carry out useful, relevant and cutting-edge research on the efficient drainage of sand and water from the wellbore in the process of natural gas hydrate mining. This paper innovatively proposes liquid-carrying and solid-carrying technology under foam circulation purging to address the existing problems of sand removal and drainage technology in hydrate mining. At present, no scholar has used this technology to solve the problem of sand removal and drainage in hydrate mining. Therefore, the research on efficient drainage is imperative. In this paper, We mainly studied the liquid-carrying and solid-carrying of vertical wellbore under the condition of foam cycle purging. We have revealed the relevant the liquid-carrying law and solid-carrying law through the above research. Full article
(This article belongs to the Special Issue Geophysics, Geomechanics, Drilling Mechanics and Seepage Mechanics of Unconventional Oil and Gas Reservoirs)
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15 pages, 2808 KiB  
Article
Field Monitoring and Identification Method for Overflow of Fractured-Vuggy Carbonate Reservoir
by Qiangui Zhang, Zelin Yan, Xiangyu Fan, Zhilin Li, Pengfei Zhao, Juntian Shuai, Lichun Jia and Lu Liu
Energies 2023, 16(5), 2399; https://doi.org/10.3390/en16052399 - 02 Mar 2023
Cited by 2 | Viewed by 1141
Abstract
Since carbonate reservoirs develop pores and fractures and have a complex formation pressure system, overflow and even blowout seriously threaten the exploration and development of these kinds of reservoirs. According to the overflow characteristics of fractured-vuggy carbonate reservoirs, a field monitoring and identification [...] Read more.
Since carbonate reservoirs develop pores and fractures and have a complex formation pressure system, overflow and even blowout seriously threaten the exploration and development of these kinds of reservoirs. According to the overflow characteristics of fractured-vuggy carbonate reservoirs, a field monitoring and identification method for overflow has been developed. This method is based on the top-down logic framework for early overflow identification, combined with optimized monitoring parameters. The DBSCAN clustering algorithm is used to identify abnormal logging parameters, and thus, a probability weight coefficient of overflow (K) indicated by the abnormal engineering parameters of a gas well can be calculated. K is divided into four early warning response levels of overflow, and the overflow control operation can be made according to the different levels of early warning response. Based on this method, an integrated software system for field monitoring and identification of early overflow is designed. This software system integrates the functions of data collection and management, overflow risk parameter calculation, overflow early warning, and overflow simulation analysis. Finally, according to a case analysis of overflow prediction for a fractured-vuggy carbonate reservoir in Well XX, this method’s prediction stability and accuracy are demonstrated, indicating that it can be used for the overflow early warning in engineering practice. Full article
(This article belongs to the Special Issue Geophysics, Geomechanics, Drilling Mechanics and Seepage Mechanics of Unconventional Oil and Gas Reservoirs)
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25 pages, 15487 KiB  
Article
Unsupervised Machine Learning Techniques for Improving Reservoir Interpretation Using Walkaway VSP and Sonic Log Data
by Mateusz Zareba, Tomasz Danek and Michal Stefaniuk
Energies 2023, 16(1), 493; https://doi.org/10.3390/en16010493 - 02 Jan 2023
Cited by 1 | Viewed by 1704
Abstract
In this paper, we present a detailed analysis of the possibility of using unsupervised machine learning techniques for reservoir interpretation based on the parameters obtained from geophysical measurements that are related to the elastic properties of rocks. Four different clustering algorithms were compared, [...] Read more.
In this paper, we present a detailed analysis of the possibility of using unsupervised machine learning techniques for reservoir interpretation based on the parameters obtained from geophysical measurements that are related to the elastic properties of rocks. Four different clustering algorithms were compared, including balanced iterative reducing and clustering using hierarchies, the Gaussian mixture model, k-means, and spectral clustering. Measurements with different vertical resolutions were used. The first set of input parameters was obtained from the walkaway VSP survey. The second one was acquired in the well using a full-wave sonic tool. Apart from the study of algorithms used for clustering, two data pre-processing paths were analyzed in the context of matching the vertical resolution of both methods. The validation of the final results was carried out using a lithological identification of the medium based on an analysis of the drill core. The measurements were performed in Silurian rocks (claystone, mudstone, marly claystone) lying under an overburdened Zechstein formation (salt and anhydrite). This formation is known for high attenuating seismic signal properties. The presented study shows results from the first and only multilevel walkaway VSP acquisition in Poland. Full article
(This article belongs to the Special Issue Geophysics, Geomechanics, Drilling Mechanics and Seepage Mechanics of Unconventional Oil and Gas Reservoirs)
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14 pages, 4787 KiB  
Article
Efficacy of Green Oxide Nanofluids as Potential Dispersants for Asphaltene in Iraqi Crudes, Experimental, Tunning and Statistical Analysis
by Dana Khidhir and Hiwa Sidiq
Energies 2022, 15(18), 6833; https://doi.org/10.3390/en15186833 - 19 Sep 2022
Cited by 2 | Viewed by 1585
Abstract
Asphaltene are large molecular crude constituents and their existence is related to numerous problems. However, nanofluids have proven to be a very stable and effective way of dealing with asphaltene agglomerations. This research addresses the effectiveness of nanofluids as compared to traditional and [...] Read more.
Asphaltene are large molecular crude constituents and their existence is related to numerous problems. However, nanofluids have proven to be a very stable and effective way of dealing with asphaltene agglomerations. This research addresses the effectiveness of nanofluids as compared to traditional and available (FLOW-X) commercial inhibitors. The synthesis and characterization of two green NPs and the preparation of nanofluids were performed successfully in this study. It was found that by tuning the concentration of nanofluid, the efficiency increases by 17%. Crude samples have shown different responses to nano inhibitors. It was found that nanofluids increase asphaltene dissolution by nearly 22% as compared to commercial inhibitors. Full article
(This article belongs to the Special Issue Geophysics, Geomechanics, Drilling Mechanics and Seepage Mechanics of Unconventional Oil and Gas Reservoirs)
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