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Processes
Special Issues
Shale Gas and Coalbed Methane Exploration and Practice
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Shale Gas and Coalbed Methane Exploration and Practice

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Energy Systems".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 1909

Special Issue Editors

Dr. Xianyu Yang

E-Mail Website
Guest Editor
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Interests: discrete element fluid dynamics; plugging mechanics; drilling fluid
Prof. Dr. Jing Zheng

E-Mail Website
Guest Editor
State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology-Beijing, Beijing 100083, China
Interests: microseismic monitoring; seismic imaging; geophysical instrument development
Dr. Debin Kong

E-Mail Website
Guest Editor
School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
Interests: fluid flow in porous media; CO2 geological storage and utilization; ehanced oil and gas recovery
Dr. Jingyu Xie

E-Mail Website
Guest Editor Assistant
School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Interests: hydraulic fracturing; rock mechanics; CO2 geological storage

Special Issue Information

Dear Colleagues,

Energy and fuel are important supports for the modern economy, representing an important foundation for the survival and development of human society and playing an indispensable role in promoting economic and social development. However, energy consumption has increased substantially, and traditional energy resources have been declining. At present, the contradiction between the increasing shortage of traditional petrochemical energy and the strong demand for energy from economic development is acute. Therefore, unconventional energy such as shale gas, shale oil, and coalbed methane are important parts of realizing a modern multi-energy system with huge reserves. To further explore new theories and methods for the efficient exploration and development of shale gas, shale oil, and coalbed methane, this Special Issue will showcase the latest research to assist in the exploration and development of unconventional oil and gas resources.

This Special Issue, entitled “Shale Gas and Coalbed Methane Exploration and Practice”, aims to cover novel advances in the above research topic.

Suitable topics include but are not limited to:

  • Shale gas exploration and development;
  • Coalbed methane exploration and development;
  • Shale oil exploration and development;
  • Microseismic monitoring;
  • Drilling fluid, completion fluid, fracturing fluid;
  • Hydraulic fracturing;
  • Theory and methods about wellbore stability;
  • Unconventional oil and gas development driven by artificial intelligence.

Dr. Xianyu Yang
Prof. Dr. Jing Zheng
Dr. Debin Kong
Guest Editors

Dr. Jingyu Xie
Guest Editor Assistant

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. Processes is an international peer-reviewed open access monthly 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

  • shale gas
  • coalbed methane
  • shale oil
  • drilling fluid and fracturing fluid
  • microseismic monitoring
  • experiments and numerical simulations
  • artificial intelligence and machine learning

Published Papers (3 papers)

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Research

27 pages, 9963 KiB  
Article
Evaluation of Deep Coalbed Methane Potential and Prediction of Favorable Areas within the Yulin Area, Ordos Basin, Based on a Multi-Level Fuzzy Comprehensive Evaluation Method
by Keyu Zhou, Fengrui Sun, Chao Yang, Feng Qiu, Zihao Wang, Shaobo Xu and Jiaming Chen
Processes 2024, 12(4), 820; https://doi.org/10.3390/pr12040820 - 18 Apr 2024
Viewed by 280
Abstract
The research on the deep coalbed methane (CBM) in the Ordos Basin is mostly concentrated on the eastern margin of the basin. The geological resources of the Benxi Formation in the Yulin area, located in the central-eastern part, cover 15,000 × 108 [...] Read more.
The research on the deep coalbed methane (CBM) in the Ordos Basin is mostly concentrated on the eastern margin of the basin. The geological resources of the Benxi Formation in the Yulin area, located in the central-eastern part, cover 15,000 × 108 m3, indicating enormous resource potential. However, the characteristics of the reservoir distribution and the favorable areas are not yet clear. This research comprehensively performed data logging, coal rock experiments, and core observations to identify the geological characteristics of the #8 coal seam, using a multi-level fuzzy mathematics method to evaluate the favorable area. The results indicate the following: (1) The thickness of the #8 coal in the Yulin Block ranges from 2.20 m to 11.37 m, with depths of between 2285.72 m and 3282.98 m, and it is mainly underlain by mudstone; the gas content ranges from 9.74 m3/t to 23.38 m3/t, showing a northwest–low and southeast–high trend. The overall area contains low-permeability reservoirs, with a prevalence of primary structural coal. (2) A multi-level evaluation system for deep CBM was established, dividing the Yulin Block into three types of favorable areas. This block features a wide range of Type I favorable areas, concentrated in the central-eastern, northern, and southwestern parts; Type II areas are closely distributed around the edges of Type I areas. The subsequent development process should prioritize the central-eastern part of the study area. The evaluation system established provides a reference for selecting favorable areas for deep CBM and offers theoretical guidance for targeted exploration and development in the Yulin area. Full article
(This article belongs to the Special Issue Shale Gas and Coalbed Methane Exploration and Practice)
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16 pages, 3484 KiB  
Article
A Numerical Simulation of the Coal Dust Migration Law in Directional Air Drilling in a Broken Soft Coal Seam
by Jie Zhang, Zichen Han, Tianzhu Chen, Ningping Yao, Xianyu Yang, Chan Chen and Jihua Cai
Processes 2024, 12(2), 309; https://doi.org/10.3390/pr12020309 - 01 Feb 2024
Viewed by 617
Abstract
Abundant industrial experiences have shown that directional air drilling technology is effective for gas drainage when drilling broken and soft coal seams. In this paper, the Eulerian–Eulerian model was used to simulate the gas–solid two-phase flow behavior of compressed air transporting coal dust [...] Read more.
Abundant industrial experiences have shown that directional air drilling technology is effective for gas drainage when drilling broken and soft coal seams. In this paper, the Eulerian–Eulerian model was used to simulate the gas–solid two-phase flow behavior of compressed air transporting coal dust in broken soft coal seams. The relationship between the degree of coal dust deposition, annular air pressure law, transportation of coal dust, aforementioned factors of rotational speed, particle size, and air volume could be determined. The results indicate that the particle size plays a significant role in the transport capacity of coal dust. Smaller particle sizes and a higher airflow result in a lower deposition degree of coal dust. When the particle size of coal dust is 1.69 mm and the airflow is 300 m3/h, in the case of coal dust generation at a rate of 0.24 m3/h, the deflection angle of the coal dust collection zone is increased by 130% as the rotational speed of the drill rod is increased from 0 to 120 rpm. Similarly, the deflection angle of the coal dust collection zone is increased by 12.8% in a 500 m3/h airflow under the same condition. Additionally, fine particle-sized coal dust is transported in a spiral line. The coal dust with larger particle sizes tends to be in the middle and lower parts of the hole and move along a specific trajectory. Industrial experiences of medium-air-pressure drilling confirm that a rotary drilling speed between 80 and 120 rpm, with a minimum air volume of 400 m3/h and preferably 500 m3/h, can promote a smooth hole drilling effect and enhance the construction safety in the gas drainage process. Full article
(This article belongs to the Special Issue Shale Gas and Coalbed Methane Exploration and Practice)
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15 pages, 5248 KiB  
Article
Experimental Water Activity Suppression and Numerical Simulation of Shale Pore Blocking
by Yansheng Shan, Hongbo Zhao, Weibin Liu, Juan Li, Huanpeng Chi, Zongan Xue, Yunxiao Zhang and Xianglong Meng
Processes 2023, 11(12), 3366; https://doi.org/10.3390/pr11123366 - 04 Dec 2023
Viewed by 605
Abstract
The nanoscale pores in shale oil and gas are often filled with external nanomaterials to enhance wellbore stability and improve energy production. And there has been considerable research on discrete element blocking models and simulations related to nanoparticles. In this paper, the pressure [...] Read more.
The nanoscale pores in shale oil and gas are often filled with external nanomaterials to enhance wellbore stability and improve energy production. And there has been considerable research on discrete element blocking models and simulations related to nanoparticles. In this paper, the pressure transmission experimental platform is used to systematically study the influence law of different water activity salt solutions on shale permeability and borehole stability. In addition, the force model of the particles in the pore space is reconstructed to study the blocking law of the particle parameters and fluid physical properties on the shale pore space based on the discrete element hydrodynamic model. However, the migration and sealing patterns of nanomaterials in shale pores are unknown, as are the effects of changes in particle parameters on nanoscale sealing. The results show that: (1) The salt solution adopts a formate system, and the salt solution is most capable of blocking the pressure transmission in the shale pores when the water activity is 0.092. The drilling fluid does not easily penetrate into the shale pore space, and it is more capable of maintaining the stability of the shale wellbore. (2) For the physical blocking numerical simulation, the nanoparticle concentration is the most critical factor affecting the shale pore blocking efficiency. Particle size has a large impact on the blocking efficiency of shale pores. The particle diameter increases by 30% and the pore-blocking efficiency increases by 13% when the maximum particle size is smaller than the pore exit. (3) Particle density has a small effect on the final sealing effect of pore space. The pore-plugging efficiency is only increased by 4% as the particle density is increased by 60%. (4) Fluid viscosity has a significant effect on shale pore plugging. The increase in viscosity at a nanoparticle concentration of 1 wt% significantly improves the sealing effectiveness, specifically, the sealing efficiency of the 5 mPa-s nanoparticle solution is 16% higher than that of the 1 mPa-s nanoparticle solution. Finally, we present a technical basis for the selection of a water-based drilling fluid system for long horizontal shale gas drilling. Full article
(This article belongs to the Special Issue Shale Gas and Coalbed Methane Exploration and Practice)
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