Article
Energy & Fuels
Jingyi Zhu, Liangping Yi, Zhaozhong Yang, Xiaogang Li
Summary: This study presents mathematical models to simulate the temperature distribution, kerogen decomposition, and production efficiency of oil and gas under microwave heating, with a focus on the effects of output power level and thermal conductivity of oil shale on reservoir temperature distribution. The study suggests that intermittent and stepwise heating modes can effectively prevent superheating and improve production efficiency compared to electrical heating.
Article
Energy & Fuels
Yang Gao, Tao Wan, Yan Dong, Yingyan Li
Summary: This paper proposes a method of in-situ combustion of shale oil using air injection, which introduces heat into the formation through multistage fractured horizontal wells to increase the contact area of shale. The research results show that the in-situ combustion process has the potential to improve oil recovery in shale oil reservoirs.
Article
Energy & Fuels
Yang Gao, Tao Wan, Yan Dong, Yingyan Li
Summary: This paper proposes a method of in-situ combustion of shale oil by injecting air to increase the kerogen exposure and improve oil and gas production.
Article
Thermodynamics
Shaotao Xu, Xiaoshu Lue, Youhong Sun, Wei Guo, Qiang Li, Lang Liu, Shijie Kang, Sunhua Deng
Summary: A temperature optimization strategy for the Huadian oil shale autothermal pyrolysis in-situ conversion process (ATS) was proposed by investigating the reaction characteristics of various semi-cokes. The calorific value of semi-coke showed three different stages of increase, decrease, and flattening with increasing pyrolysis temperature, peaking at around 330 degrees C. The combustion characteristics of semi-coke formed at different temperatures were similar, but decreased at about 330 degrees C due to pore blockage caused by bitumen. A reasonable strategy for temperature parameter screening was proposed, providing crucial guidance for practical engineering applications.
Article
Engineering, Chemical
Yiwei Wang, Jun Luo, Zhenghong Shang
Summary: This study establishes in situ pyrolysis models for shale oil using CMG-STARS software and conducts sensitivity analysis. The results show that heating power, initial kerogen concentration, and reaction activation energy are the major influencing factors for oil and gas production. The study also reveals that non-uniformity of the temperature field can cause light oil to convert to gas and char. It is suggested to control formation temperature to prevent oil production loss.
Article
Energy & Fuels
Xudong Chen, Xiang Rao, Yunfeng Xu, Yina Liu
Summary: This paper presents an effective numerical simulation method for predicting the production of oil shale reservoirs with steam injection. The method uses finite volume-based discretization schemes and an embedded discrete fracture model to handle the fractured vertical well. A smooth non-linear solver is proposed to solve the global equations, providing accurate results for pressure, temperature, saturation, component mole fractions, and well production rates. The method outperforms existing commercial software by providing smoother non-linear solutions and handling complex fracture geometries theoretically. Numerical examples and case studies demonstrate the accuracy and effectiveness of the presented method for steam injection-assisted in situ recovery of oil shale.
Article
Energy & Fuels
Mohamed Amine Ifticene, Chengdong Yuan, Kamil G. Sadikov, Dmitrii A. Emelianov, Ameen A. Al-Muntaser, Mikhail A. Varfolomeev
Summary: This study investigates the combustion behavior and kinetics of Domanik oil shale using experimental methods and evaluates the thermal behavior, stability of the combustion front, and upgrading effect of the combustion process. The results showed that the combustion process of oil shale has two reaction stages and has a stable propagation of the combustion front, leading to a good upgrading effect.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Alexander V. Bolotov, Chengdong Yuan, Mikhail A. Varfolomeev, Usman H. Taura, Yahya M. Al-Wahaibi, Ilgiz F. Minkhanov, Vadim K. Derevyanko, Saif Al-Bahry, Sanket Joshi, Aidar R. Tazeev, Rail I. Kadyrov, Dmitrii A. Emelianov, Wanfen Pu, Ahmed Naabi, Majid Hasani, Rashid Said Al Busaidi
Summary: The idea of in-situ combustion (ISC) for oil shale development and conversion has been proposed recently. This work provides experimental evidence of the successful establishment and propagation of combustion front in fractured, low-permeability oil shale.
Article
Thermodynamics
Zhihong Lei, Yulong Zhang, Zijiang Yang, Yu Shi, Hongyuan Zhang, Xiaojiang Li, Qiliang Cui
Summary: This paper compares in-situ steam heating and electrical heating methods for oil shale exploitation. The results show that steam injection heating has superior output, energy consumption, and production cycle compared to electrical heating. The flow rate and temperature of the injected steam, as well as the specific heat capacity of oil shale, have a significant impact on productivity. Thermal conductivity and porosity have less influence on mining efficiency. Additionally, different well pattern structures also affect productivity.
APPLIED THERMAL ENGINEERING
(2024)
Article
Chemistry, Analytical
Jiahui Li, Xuanlong Shan, Xue Song, Wentong He
Summary: This study conducted a simulation experiment to investigate the in situ conversion process of Huadian oil shale under real underground pressure. The pyrolysis process, subsurface conversion environment, and hydrocarbon generation patterns were systematically analyzed. The results showed that the main oil production stage of Huadian oil shale occurs between 375-425 degrees Celsius. The heating temperature should not be lower than 350 degrees Celsius, and at 425 degrees Celsius, the oil shale no longer has hydrocarbon generation value.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Thermodynamics
Wei Guo, Xu Zhang, Youhong Sun, Qiang Li, Zhao Liu
Summary: This study investigated the migration mechanism and influencing factors of pyrolysis oil in oil shale reservoirs through experiments and simulations. The results showed that oil components in pyrolysis oil underwent separation and followed an alternate cycle of volatilization, migration, and condensation in high-temperature reservoirs. The deposition of asphaltene and the accumulation of high-viscosity oil significantly reduced reservoir permeability during the middle stage of exploitation. Additionally, it was found that the quality of produced oil and the energy conversion ratio improved greatly when the temperature of injected nitrogen was 500 degrees C.
Article
Chemistry, Multidisciplinary
Chunxia Jia, Hao Yu, Hongpeng Liu, Hong Qin, Qing Wang
Summary: The temperature and heating rate were found to have significant effects on the pyrolysis products of Indonesian oil sand. Fourier transform infrared spectroscopy revealed the presence of four functional group bands in the oil sand. Additionally, the study showed that temperature influenced the total pore volume and specific surface area of char, while the heating rate did not significantly affect the development of pore structure. This research provides a theoretical foundation for the effective exploitation and economical application of oil sand.
Article
Engineering, Chemical
Kai Liao, Jian Zhu, Xun Sun, Shicheng Zhang, Guangcong Ren
Summary: This study investigates the recovery and production performance of injected fluid in shale oil wells through an integrated model and simulation analysis. The results show that pumping rate, slick water ratio, cluster spacing, stage spacing, and flowback rate all have impacts on recovery and productivity. These findings provide guidance for the design of fracturing schemes and the optimization of flowback schedules for shale oil reservoirs.
Article
Green & Sustainable Science & Technology
Haoche Shui, Yuan Wang, Zhao Liu, Wei Guo
Summary: This study proposes a method of using catalytic combustion of low calorific value industrial waste gas to generate high temperature exhaust gas suitable for mining. The relationship between gas injection flow rate, combustion chamber parameters and gas injection duration is established by mathematical methods. The results show that under high pressure conditions downhole, the exhaust gas temperature and conversion rate of low calorific gas are significantly improved.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Jingyi Zhu, Liangping Yi, Zhaozhong Yang, Ming Duan
Summary: Microwave heating technology has been explored as an alternative to conventional heating methods for oil shale upgrading. Numerical simulations were conducted to investigate the thermal response of oil shale under microwave irradiation, revealing nonuniform temperature distribution and the most efficient heating frequency at 2.45 GHz.
CHEMICAL ENGINEERING JOURNAL
(2021)
