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Advanced Technologies in Oil Shale Conversion
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Advanced Technologies in Oil Shale Conversion

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

Deadline for manuscript submissions: closed (30 September 2024) | Viewed by 2014

Special Issue Editor

Dr. Qiang Li

E-Mail Website
Guest Editor
College of Construction Engineering, Jilin University, Changchun 130026, China
Interests: technologies related to in situ conversion and mining of oil shale

Special Issue Information

Dear Colleagues,

The objective of using advanced technology for oil shale conversion is to bridge the gap between sustainable and commercial engineering and science. This can be achieved by publishing written articles that are intelligible to scientists, engineers, and geologists focusing on related areas.

This Special Issue titled ‘Advanced Technologies in Oil Shale Conversion’ aims to present most advanced oil shale conversion technologies in its broadest possible sense.

The topic of interest for publication include, but are not limited to the following:

  • Advanced and commercial in situ oil shale technologies and applications;
  • Efficient heat transfer in oil shale recovery;
  • Creative oil shale reservoir stimulation techniques in theories, modelling, and applications;
  • Key apparatus and devices for oil shale exploitation and experiment under real recovery conditions;
  • Thermal–hydrological–mechanical–chemical coupling in oil shale exploitation;
  • Advanced modelling approaches;
  • Novel and comprehensive products characterization.

Dr. Qiang Li
Guest Editor

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

  • oil shale
  • modelling
  • applications
  • device design
  • products analysis
  • EOR

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

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Research

23 pages, 16749 KiB  
Article
A Thermo-Hydro-Mechanical Damage Coupling Model for Stability Analysis During the In Situ Conversion Process
by Guoping Li, Juan Jin, Weixi Chen, Minghui Zhao, Jiandong Liu, Bo Fang and Tingfu Ye
Energies 2025, 18(6), 1424; https://doi.org/10.3390/en18061424 - 13 Mar 2025
Viewed by 594
Abstract
This study addresses stability challenges in oil shale reservoirs during the in situ conversion process by developing a thermo-hydro-mechanical damage (THMD) coupling model. The THMD model integrates thermo-poroelasticity theory with a localized gradient damage approach, accounting for thermal expansion and pore pressure effects [...] Read more.
This study addresses stability challenges in oil shale reservoirs during the in situ conversion process by developing a thermo-hydro-mechanical damage (THMD) coupling model. The THMD model integrates thermo-poroelasticity theory with a localized gradient damage approach, accounting for thermal expansion and pore pressure effects on stress evolution and avoiding mesh dependency issues present in conventional local damage models. To capture tensile–compressive asymmetry in geotechnical materials, an equivalent strain based on strain energy density is introduced, which regularizes the tensile component of the elastic strain energy density. Additionally, the model simulates the multi-layer wellbore structure and the dynamic heating and extraction processes, recreating the in situ environment. Validation through a comparison of numerical solutions with both experimental and analytical results confirms the accuracy and reliability of the proposed model. Wellbore stability analysis reveals that damage tends to propagate in the horizontal direction due to the disparity between horizontal and vertical in situ stresses, and the damaged area at a heating temperature of 600 °C is nearly three times that at a heating temperature of 400 °C. In addition, a cement sheath thickness of approximately 50 mm is recommended to optimize heat transfer efficiency and wellbore integrity to improve economic returns. Our study shows that high extraction pressure (−4 MPa) nearly doubles the reservoir’s damage area and increases subsidence from −3.6 cm to −6.5 cm within six months. These results demonstrate the model’s ability to guide improved extraction efficiency and mitigate environmental risks, offering valuable insights for optimizing in situ conversion strategies. Full article
(This article belongs to the Special Issue Advanced Technologies in Oil Shale Conversion)
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19 pages, 8104 KiB  
Article
Comparison of Pore Structure Characteristics of Shale-Oil and Tight-Oil Reservoirs in the Fengcheng Formation in Mahu Sag
by Guoyong Liu, Yong Tang, Kouqi Liu, Zuoqiang Liu, Tao Zhu, Yang Zou, Xinlong Liu, Sen Yang and An Xie
Energies 2024, 17(16), 4027; https://doi.org/10.3390/en17164027 - 14 Aug 2024
Cited by 3 | Viewed by 1089
Abstract
Despite the abundance of shale-oil and tight-oil reserves in the Fengcheng Formation within the Mahu Sag, exploration and development efforts for both types of reservoir are still in their early stages. A comprehensive examination and comparison of the pore structures of these reservoirs [...] Read more.
Despite the abundance of shale-oil and tight-oil reserves in the Fengcheng Formation within the Mahu Sag, exploration and development efforts for both types of reservoir are still in their early stages. A comprehensive examination and comparison of the pore structures of these reservoirs can establish rational classification and evaluation criteria. However, there is a dearth of comparative analyses focusing on the pore structures of shale-oil and tight-oil reservoirs within the Fengcheng Formation. This study addresses this gap by systematically analyzing and comparing the pore structures of these reservoirs using various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), low-temperature nitrogen adsorption, and mercury intrusion capillary pressure experiments (MICP). The results show that the shale oil within the Fengcheng Formation exhibits a higher content of carbonic acid compared to the tight-oil samples. Furthermore, it demonstrates smaller displacement pressure and median pressure, a larger sorting coefficient, and superior permeability in contrast to tight oil. Notably, the shale oil within the Fengcheng Formation is characterized by abundant striated layer structures and micro-fractures, which significantly contribute to the microstructural disparities between shale-oil and tight-oil reservoirs. These differences in microstructures between shale oil and tight oil within the Fengcheng Formation in the Mahu Sag region delineate distinct criteria for evaluating sweet spots in shale-oil and tight-oil reservoirs. Full article
(This article belongs to the Special Issue Advanced Technologies in Oil Shale Conversion)
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