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Mining of Underground Energy Storage
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Mining of Underground Energy Storage

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Civil Engineering".

Deadline for manuscript submissions: closed (20 October 2022) | Viewed by 4363

Special Issue Editors

Dr. Feng Chen

E-Mail Website
Guest Editor
Wuhan Institute of Rock and Soil Mechanics Chinese Academy of Sciences, Wuhan 430071, China
Interests: mechanical behaviors of rock salt; salt cavern shrinkage analysis; natural gas and oil storage in the salt cavern; integrity analysis of salt cavern; cavern leaching technology
Prof. Dr. Yintong Guo

E-Mail Website
Guest Editor
Wuhan Institute of Rock and Soil Mechanics Chinese Academy of Sciences, Wuhan 430071, China
Interests: rock mechanics; gas leakage evaluation; integrity analysis of cavern or reservoir; reservoir reconstruction technologies

Special Issue Information

Dear Colleagues,

Underground energy storage (natural gas, oil, hydrogen, etc.) is one of the most important topics for the sustainable development of the national economy, and its storage capability is integral to the strategic security of urban energy.

Natural gas or oil can be mainly stored in depleted natural gas reservoirs, rock salt caverns and saline formations. In recent years, some safety incidents have occurred during the operation period of underground energy storage, and some new technologies and methods have been applied to energy storage engineering.

This Special Issue intends to present new ideas and technologies, experimental results, a theory analysis and practical application cases in the field of underground energy storage. The topics of interest include, but are not limited to, rock mechanics, gas leakage, evaluation of storage, integrity analysis of caverns or reservoirs, new technologies of drilling and leaching, reservoir reconstruction technology, etc.

Dr. Feng Chen
Prof. Dr. Yintong Guo
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. Applied Sciences 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

  • underground energy storage
  • depleted oil–gas reservoir
  • gas leakage evaluation of storage
  • rock mechanics
  • cavern safety analysis
  • integrity analysis of cavern or reservoir
  • operation optimization
  • technologies of drilling and leaching cavern
  • reservoir reconstruction technologies

Published Papers (2 papers)

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Research

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27 pages, 11338 KiB  
Article
Mechanistic Study on the Influence of Stratigraphy on the Initiation and Expansion Pattern of Hydraulic Fractures in Shale Reservoirs
by Shuangming Li, Zhiwen Hu and Xin Chang
Appl. Sci. 2022, 12(16), 8082; https://doi.org/10.3390/app12168082 - 12 Aug 2022
Viewed by 1128
Abstract
The unique depositional characteristics of shale reservoirs lead to the extreme development of shale laminae, natural fractures, and other weak surfaces, which have an important influence on the hydraulic fracture extension behavior and the final fracture geometry. Therefore, because the deep shale laminar [...] Read more.
The unique depositional characteristics of shale reservoirs lead to the extreme development of shale laminae, natural fractures, and other weak surfaces, which have an important influence on the hydraulic fracture extension behavior and the final fracture geometry. Therefore, because the deep shale laminar development and hydraulic fracture interaction theory and influence mechanism are not clear, this paper focuses on the analysis of the influence law of the ground stress difference, laminar surface cementation characteristics, laminar surface dip angle, and other factors on the hydraulic fracture extension pattern in shale reservoirs based on the cohesive unit method. Numerical calculation results show that (1) the hydraulic cracks are first expanded along the direction perpendicular to the minimum horizontal principal stress after starting to crack from the injection point and then turn to expand along the side of the laminar surface when encountering the laminar surface. (2) Three laminar dips of 5°, 30°, and 60° were compared and found. A certain ground stress difference is conducive to communicating more laminated joints and forming a more complex fracture network, while too large of a ground stress difference reduces the complexity of artificial fractures. (3) The smaller the inclination of the laminate surface is, the greater the positive stress it is subjected to, the more difficult it is for the laminate joints to undergo shear slip, and the more difficult it is to open. (4) Under the same ground stress combination state and laminar surface inclination, laminated cementation strengths of 2 and 0.5 MPa were compared, and it was found that the lower the cementation strength of the laminate is, the more likely the hydraulic fracture will be activated to shear slip damage. At the same time, the reliability of the simulation study on the effect of laminar surfaces on hydraulic fracture extension based on the cohesive unit method is verified by combining with the corresponding indoor hydraulic physical model test, which provides a reference for the accurate description of the interaction mechanism between laminar surfaces and hydraulic fractures. Full article
(This article belongs to the Special Issue Mining of Underground Energy Storage)
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Review

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26 pages, 3343 KiB  
Review
Research Status of and Trends in 3D Geological Property Modeling Methods: A Review
by Yuyang Liu, Xiaowei Zhang, Wei Guo, Lixia Kang, Jinliang Gao, Rongze Yu, Yuping Sun and Mao Pan
Appl. Sci. 2022, 12(11), 5648; https://doi.org/10.3390/app12115648 - 2 Jun 2022
Cited by 5 | Viewed by 2890
Abstract
Three-dimensional (3D) geological property modeling is used to quantitatively characterize various geological attributes in 3D space based on geostatistics with the help of computer visualization technology, and the results are often stored in grid data. The 3D geological property modeling includes two main [...] Read more.
Three-dimensional (3D) geological property modeling is used to quantitatively characterize various geological attributes in 3D space based on geostatistics with the help of computer visualization technology, and the results are often stored in grid data. The 3D geological property modeling includes two main components, grid model generation and property interpolation. In this review article, the existing grid generation methods are systematically investigated, and both traditional and multiple-point geostatistical algorithms involved in interpolation methods are comprehensively analyzed. It is shown that considering the numerical simulation of oil reservoirs, the orthogonal hexahedral grid remains the most suitable grid model for simulations in petroleum exploration and development. For the interpolation methods aspect, most geological phenomena are nonstationary, to simulate various types of reservoirs; the main development trends are increasing geological constraints and reducing the limitation of stationarity. Both methods have certain constraints, and the multiscale problem of multiple-point geostatistics poses a main challenge to the field. In addition, the deep-learning based method is a new trend in geological property modeling. Full article
(This article belongs to the Special Issue Mining of Underground Energy Storage)
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