Article
Engineering, Petroleum
Cao Wei, Yang Liu, Ya Deng, Shiqing Cheng, Hassan Hassanzadeh
Summary: This study aims to investigate the temperature behavior of geothermal reservoirs and explore suitable analysis methods for reservoir characterization and development potential evaluation. Numerical and analytical models were developed to analyze the temperature behavior, taking into account various factors. The results show that temperature data provide important information about reservoir properties and can be used to estimate key parameters. Furthermore, an integrated workflow combining pressure transient analysis and temperature transient analysis was introduced.
Article
Mechanics
Heqian Zhao, Kan Wu, Zhongwei Huang, Zhengming Xu, Huaizhong Shi, Haizhu Wang
Summary: Hydraulic fracturing has become a crucial technology for unconventional oil and gas development. CO2 fracturing shows advantages in shale gas exploitation due to its ability to activate more natural fractures in reservoirs. The study establishes a CO2 fracturing model in naturally fractured reservoirs and demonstrates its effectiveness in creating longer, narrower fractures and connecting more natural fractures to stimulate a larger reservoir volume. Additionally, natural fracture spacing and length significantly impact the distribution and connectivity of natural fractures in CO2 fracturing.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Energy & Fuels
Faisal Awad Aljuboori, Jang Hyun Lee, Khaled A. Elraies, Karl D. Stephen, Muhammed Khan Memon
Summary: This paper presents an improvement to the original MINC model by using a particular case of two subdomains model and making adjustments to the calculation of fluid saturation. The new adjustments have provided a stable solution and improved simulation results compared with the original MINC model. The matrix layers in the model have the advantage of handling various heterogeneities with excellent simulation accuracy and reliable performance and prediction.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Mechanics
Heqian Zhao, Kan Wu, Zhongwei Huang, Zhengming Xu, Huaizhong Shi, Haizhu Wang
Summary: CO2 fracturing shows better effectiveness and efficiency in naturally fractured reservoirs, generating relatively longer but narrower fractures, activating more natural fractures, and creating a larger stimulated reservoir volume.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Energy & Fuels
Ming Li, Jianchun Guo, Fujian Zhou, Lele Cao, Ben Li
Summary: This study evaluated the effect of preformed particle gel (PPG) on the conformance control of naturally fractured tight sandstone reservoirs using a Pressure Transfer Test (PTT) method. The results showed that vertical and oblique penetrations had the highest plugging effect, with a 12% higher rate than fractures without effective channels. Injection pressure and salinity also significantly impacted the plugging efficiency of PPG. This study provides valuable experimental and theoretical references for the field application and further studies of PPG in naturally fractured tight reservoirs.
Article
Energy & Fuels
Milos Pejic, Riyaz Kharrat, Ali Kadkhodaie, Siroos Azizmohammadi, Holger Ott
Summary: This study focuses on the impact of natural fractures on production performance of reservoirs. Different fracture types and their extents were studied and found to play a crucial role in reservoir production. The study also observed different impacts of fractures in secondary recovery methods like waterflooding and gas injection. The findings improve the understanding of fracture networks' impact on oil recovery and the history matching process.
Article
Environmental Sciences
V. E. Spooner, S. Geiger, D. Arnold
Summary: By introducing the retardation factor R and new metrics, single-porosity flow diagnostics have been extended to dual-porosity systems for more accurate assessment of displacement efficiency and dynamic heterogeneity in fractured reservoirs. Combining L-c*(star) and E-v*(star) with stochastic optimization algorithms can improve the displacement efficiency of injected fluid. Dual-porosity flow diagnostics have advantages in screening parameter space and quickly identifying scenarios that need further study.
WATER RESOURCES RESEARCH
(2021)
Article
Energy & Fuels
Khadijeh Zare, Hojjat Mahiyar, Mojtaba Ghaedi
Summary: The rising water level in fracture networks of a naturally fractured gas reservoir poses challenges to gas recovery, but using seismic waves can be a cost-effective and environmentally friendly enhanced recovery method. This study investigates the efficiency of seismic vibration in driving remaining gas into fractures, with promising results showing substantial gas recovery enhancement at lower frequencies and in highly permeable matrix and fractures.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2021)
Review
Chemistry, Multidisciplinary
Nediljka Gaurina-Medimurec, Borivoje Pasic, Petar Mijic, Igor Medved
Summary: The text discusses the challenges faced by drilling engineers when drilling through naturally fractured reservoirs, as well as the methods to prevent loss of circulation and related consequences, such as blocking fractures and improving drilling and cementing technology.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Petroleum
Kai Zhang, Jinding Zhang, Xiaopeng Ma, Chuanjin Yao, Liming Zhang, Yongfei Yang, Jian Wang, Jun Yao, Hui Zhao
Summary: This paper introduces a new characterization method for multiscale fracture network and a powerful dimensionality-reduction method using autoencoder to address the challenges in history matching fractured reservoirs. The new approach simplifies the fracture network effectively and improves the quality of historical matching.
Review
Energy & Fuels
Marzhan Karimova, Razieh Kashiri, Peyman Pourafshary, Randy Hazlett
Summary: Fluid flow in naturally fractured reservoirs is complex and heterogeneous, and understanding fracture-matrix interactions is crucial. Fluid movement between fractures and matrix occurs through spontaneous imbibition, which can be affected by wettability. Low-salinity water injection is considered as an effective enhanced oil recovery approach for fractured and non-water-wet carbonate rocks. This review summarizes experimental and numerical studies on the imbibition process and highlights the need for further research on wettability alteration and simulation models for co/countercurrent flows in naturally fractured reservoirs.
Article
Multidisciplinary Sciences
Loai Saifelden Elkamel, Behnam Sedaee
Summary: Steam injection in naturally fractured reservoirs presents a complex and nonlinear problem due to the coupling of matrix and fracture systems. This study simulated cyclic steam stimulation oil recovery in a naturally fractured reservoir, analyzed the impact of operating parameters on oil recovery and net present value, and found that optimizing injection period, steam slug size, soak and production periods is crucial for maximizing recovery and cost efficiency.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Mathematics, Interdisciplinary Applications
Mustafa Mudhafar Shawkat, Abdul Rahim Bin Risal, Noor J. Mahdi, Ziauddin Safari, Maryam H. Naser, Ahmed W. Al Zand
Summary: Naturally fractured reservoirs pose challenges due to tectonic movements that increase fractures' permeability and conductivity. The instability of these properties affects fluid flow, causing problems during fluid transfer and production. This study introduced new machine learning models to predict fracture properties in reservoirs and highlighted the importance of computer-aided analysis for fractured reservoirs. The research demonstrated the effectiveness of the models and emphasized the need for execution techniques, such as artificial crack creation, to minimize hydrocarbon losses.
Article
Energy & Fuels
Yumeng Chen, Zhendong Song, Qingxuan Sun, Ke Liu, Shunxuan Hu, Junguo Li
Summary: Microfine coal particles modified with naphthalene sulfonate formaldehyde (NSF) exhibit improved dispersibility in microfine coal water slurry (MCWS), resulting in significantly decreased apparent viscosity and yield stress. The presence of NSF extends into the surrounding solution to form a hydrophilic film, improving the wetting ability of the coal surface. These findings provide insights into the interaction mechanism of microfine coals modified with NSF, offering guidance for MCWS preparation.
Article
Energy & Fuels
Reda Abdel Azim, Saad Alatefi, Ahmad Alkouh
Summary: Naturally fractured reservoirs, characterized by the existence of natural fractures and fissures, have complex characteristics that significantly impact fluid flow and make production prediction and management difficult. A mathematical model called FRACSIM has been developed for the simulation of flow behavior in these reservoirs. The model has been verified against commercial software and successfully simulated real and laboratory cases, showing its effectiveness in predicting flow behavior and evaluating production performance.