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Energies
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Unconventional Oil and Gas Resources: Exploitation and Development
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Unconventional Oil and Gas Resources: Exploitation and Development

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H1: Petroleum Engineering".

Deadline for manuscript submissions: closed (5 April 2023) | Viewed by 3766

Special Issue Editors

Dr. Chengpeng Zhang

E-Mail Website
Guest Editor
State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China
Interests: unconventional reservoirs stimulation; rock micro-mechanics; supercritical CO2 fracturing; micro-proppant
Prof. Dr. Junping Zhou

E-Mail Website
Guest Editor
School of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China
Interests: carbon storage; fluid rock interaction; shale gas
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Wanchun Zhao

E-Mail Website
Guest Editor
Institute of Unconventional Oil & Gas, Northeast Petroleum University, Daqing 163318, China
Interests: unconventional oil and gas fracturing; oil and gas reservoir stimulation; rock mechanics; particle flow migration characterization

Special Issue Information

Dear Colleagues,

Unconventional oil and gas resources mainly include coalbed methane, shale gas, tight sandstone gas, shale oil, ultra-heavy oil, oil sands, gas hydrate and so on, and they are playing an increasingly important role in the world’s energy structure at present. However, due to the complicated geological conditions and ultra-low permeability of unconventional oil and gas reservoirs, some traditional development techniques are not suitable and mature in these reservoirs, leading to low oil or gas production, serious environmental pollution and other urgent problems. Therefore, it is necessary to strengthen the basic theoretical research of unconventional oil and gas to find high-quality resources to optimize and develop technologies to accelerate the extraction of unconventional oil and gas resources. This Special Issue calls for papers areas addressing the new sciences developed to enhance the recovery process of unconventional oil and gas. We therefore especially welcome submissions on the following topics:

  • Coal seam gas extraction;
  • Shale gas extraction;
  • Tight gas extraction;
  • Heavy oil extraction;
  • Enhanced oil recovery (EOR);
  • Enhanced gas recovery (EGR);
  • Production enhancing techniques including hydraulic fracturing;
  • Numerical methods;
  • Reservoir geomechanics;
  • Wellbore and drilling mechanics;
  • Flow in porous and fractured media;
  • Coupled hydro-thermal-mechanical processes;
  • CO2 storage in depleted oil and gas reservoirs.

Dr. Chengpeng Zhang
Prof. Dr. Junping Zhou
Prof. Dr. Wanchun Zhao
Guest Editors

Manuscript Submission Information

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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

  • unconventional oil and gas
  • oil and gas formation stimulation
  • shale oil/gas
  • enhanced oil and gas recovery
  • reservoir fluid mechanics

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Published Papers (2 papers)

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Research

16 pages, 6417 KiB  
Article
Self-Sourced Unconventional Tight Marlstone Reservoir Potential from Evaporative Lagoon of Triassic Leikoupo Formation in the Central Sichuan Basin
by Jianyong Zhang, Yongguang Xin, Hao Zhang, Han Tian, Wei Chen and Xinjian Zhu
Energies 2023, 16(13), 5086; https://doi.org/10.3390/en16135086 - 30 Jun 2023
Viewed by 1071
Abstract
A breakthrough was made in tight marlstone reservoirs from an evaporative lagoon in the second sub-member of the third member of the Leikoupo Formation (Lei3-2) in the Central Sichuan Basin. The source rock characteristics, reservoir characteristics of the marlstone and geochemical parameters of [...] Read more.
A breakthrough was made in tight marlstone reservoirs from an evaporative lagoon in the second sub-member of the third member of the Leikoupo Formation (Lei3-2) in the Central Sichuan Basin. The source rock characteristics, reservoir characteristics of the marlstone and geochemical parameters of the oil and natural gas were investigated to evaluate the unconventional hydrocarbon exploration potential of the tight marlstone from the evaporative lagoon. The results revealed that the source rocks were deposited in evaporative lagoon environments, and the average total organic carbon (TOC) content value for the samples was 0.75 wt%. The thermal maturity of the organic matter was relatively high, with a calculated vitrinite reflectance (Rc) of 1.7%. The characteristics of marlstones suggest that the potential source rocks had fair to good hydrocarbon generative potential. The condensate samples had low densities, low viscosities and high thermal maturity, with a Rc value of 1.7%. For the natural gas, the dry coefficient was around 0.90, and the carbon isotopic compositions of methane and ethane was −41.3‰ and −28.4‰, respectively. According to the carbon isotopic compositions, thermal maturity and geological background, the oil and natural gas from Lei3-2 are comparable with the marlstone of Lei3-2. Thus, the oil and natural gas is self-sourced and originates from the marlstone in the Lei3-2. Micropores and microfractures are often detected in the marlstone from Lei3-2, and a gypsum layer is conducive to the hydrocarbon preservation. These results suggest that the evaporative lagoon facies in Lei3-2 have large, self-sourced, unconventional, tight marlstone reservoir potential. This study also enhances the prospects for further oil and gas exploration of evaporative lagoon facies in other basins. Full article
(This article belongs to the Special Issue Unconventional Oil and Gas Resources: Exploitation and Development)
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16 pages, 3459 KiB  
Article
Evolution Law of Wellbore Instability Risk under Fluctuating Pressure
by Kai Zhao, Wenjie Song, Jingen Deng, Qiang Tan and Xiaoyun Wang
Energies 2023, 16(7), 2948; https://doi.org/10.3390/en16072948 - 23 Mar 2023
Cited by 4 | Viewed by 1797
Abstract
The bottom hole fluctuating pressure has a large influence on the wellbore instability. To address this problem, firstly, according to the principle of seepage mechanics, we established a calculation model of the change in pore pressure around the wellbore radius under fluctuating pressure; [...] Read more.
The bottom hole fluctuating pressure has a large influence on the wellbore instability. To address this problem, firstly, according to the principle of seepage mechanics, we established a calculation model of the change in pore pressure around the wellbore radius under fluctuating pressure; then, through laboratory rock mechanics test and rock damage mechanics theory analysis, the change law of formation strength under the action of static hydration and dynamic damage are determined; finally, based on the theory of rock mechanics in porous media, a quantitative evaluation method for the risk of wellbore instability under fluctuating pressure is established and the changing pattern of wellbore instability risk is analyzed. The results show that the pore pressure around the well shows a trend of fluctuation increase under fluctuating pressure, and there is a certain lag in the fluctuation of pore pressure inside the formation; the longer the muddy shale is immersed in drilling fluid, the greater the reduction in strength; the reduction is greater in the early stage of immersion, and the reduction in strength in water-based drilling fluid is greater than that in oil-based drilling fluid. At the beginning of the pressure cycle, the formation damage variable and compressive strength gradually increase and decrease with the increase of the pressure cycle number; after several cycles, the magnitude of change gradually decreases with the increase of the cycle number. When the bottom hole pressure fluctuates at a certain period, the greater the fluctuation, the shorter the period of wellbore stability; when the bottom hole pressure fluctuates at a certain range, the smaller the fluctuation period, the faster the borehole enters the high-risk period, while the shortest period of wellbore stability occurs when the fluctuation period is smallest; and when the wave cycle is in the middle, the wellbore stability period is the longest. Full article
(This article belongs to the Special Issue Unconventional Oil and Gas Resources: Exploitation and Development)
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