Advanced Fracturing Technology for Oil and Gas Reservoir Stimulation (2nd Edition)

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

Deadline for manuscript submissions: 10 May 2026 | Viewed by 486

Special Issue Editors


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Guest Editor
Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
Interests: hydraulic fracturing; machine learning; geomechanics; multiphysics modeling
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Guest Editor
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Interests: hydraulic fracturing; machine learning; fracture diagnosis
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Guest Editor
School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
Interests: hydraulic fracturing; scCO2 fracturing; deep learning based prediction of fracture propagation
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Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
Interests: fractured well testing; coupled multiphysics modeling of fractured unconventional reservoirs; fluid flow in porous media; post-fracturing performance evaluation
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Guest Editor
Research Institute of Petroleum Exploration & Development, PetroChina Corporation, Beijing 100083, China
Interests: advanced hydraulic fracturing technology; rock mechanics; fracturing optimization; fracturing materials
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Special Issue Information

Dear Colleagues,

With the continuous exploration and development of oil and gas, the quality of global oil and gas resources has gradually deteriorated. For example, the exploration targets of onshore oil fields have turned to deep and ultra-deep formations, while the exploration targets of offshore oil fields have turned to low-permeability ones. These resources generate unique challenges, such as low primary productivity and a sharp decline in production rates. Determining how to enhance and maintain the long-term productivity of these reservoirs is an urgent issue that needs to be addressed. Advanced reservoir stimulation technology is the key to solving these problems.

To overcome these challenges, researchers have continued to update the related theory of fracturing and introduce a series of advanced fracturing technologies. The aim of this Special Issue is to present the most recent theoretical research, indoor experimental work, and on-site experiments in the following fields:

  • Advanced sweet-spot evaluation methods for hydraulic fracturing;
  • Advanced optimization methods for fracturing treatment parameters;
  • Advanced simulation methods for fracture propagation and proppant transport, including physical and numerical simulation;
  • Advanced fracture conductivity evaluation and prediction methods;
  • Advanced fracturing diagnosis methods;
  • Evaluation and application of advanced fracturing materials and equipment;
  • Advanced fracturing technology application case studies.

Dr. Yuxuan Liu
Prof. Dr. Mao Sheng
Prof. Dr. Jianwei Tian
Dr. Jie Zeng
Dr. Chunming He
Guest Editors

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Keywords

  • hydraulic fracturing
  • sweet spot evaluation
  • optimization methods
  • hydraulic fracture propagation
  • proppant transport
  • fracture conductivity
  • fracturing diagnosis
  • fracturing materials
  • fracturing equipment
  • advanced technology

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Published Papers (1 paper)

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Research

24 pages, 5586 KB  
Article
Mechanisms of Proppant Pack Instability and Flowback During the Entire Production Process of Deep Coalbed Methane
by Xianlu Cai, Zhiming Wang, Wenting Zeng, Tianhao Huang, Binwang Li, Pengyin Yan and Anna Dai
Processes 2025, 13(11), 3605; https://doi.org/10.3390/pr13113605 - 7 Nov 2025
Viewed by 370
Abstract
Deep coalbed methane (DCBM) reservoirs often experience severe proppant flowback during large-scale hydraulic fracturing, which undermines fracture conductivity and limits long-term recovery. The critical flowback velocity (CFVP) is the key parameter controlling proppant pack instability and flowback. In this study, the instability and [...] Read more.
Deep coalbed methane (DCBM) reservoirs often experience severe proppant flowback during large-scale hydraulic fracturing, which undermines fracture conductivity and limits long-term recovery. The critical flowback velocity (CFVP) is the key parameter controlling proppant pack instability and flowback. In this study, the instability and flowback behavior of proppant packs throughout the entire production process, from early water flowback to late gas-dominated stages, were systematically investigated. Proppant flowback under closure stress was simulated using a CFD–DEM approach to clarify the flowback process and mechanical mechanisms. Laboratory experiments on coal fracture surfaces under gas-liquid two-phase and gas-liquid-solid three-phase conditions were then conducted to quantify CFVP and its variation across different production stages. Finally, a semi-empirical CFVP predictive model was developed through dimensional analysis. Results show that proppant flowback proceeds through three distinct stages—no flowback, gradual flowback, and rapid flowback. Increasing fracture width reduces proppant pack stability and lowers CFVP but allows higher flow capacity, and within the typical gas and water production ranges of deep coalbed methane reservoirs, flowback is significantly reduced when the width exceeds about 8 mm. Closure stress enhances CFVP below 15 MPa but has little effect above this threshold, while higher stresses progressively stabilize the proppant pack and minimize flowback. Larger average proppant size raises CFVP and preserves conductivity, whereas higher gas–liquid ratios elevate CFVP and reduce flowback, with ratios above 40 sustaining consistently low flowback levels. These findings clarify the mechanisms and threshold conditions of proppant flowback, establish quantitative CFVP benchmarks, and deliver theoretical as well as experimental guidance for optimizing DCBM production. Full article
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