Article
Geochemistry & Geophysics
Juhwan Woo, Jiyoung Choi, Seok Hoon Yoon, Chul Woo Rhee
Summary: Shale reservoirs are difficult to characterize and require an integration of geological, petrophysical, and geochemical analyses. The application of sequence stratigraphy in shales helps in predicting reservoir quality. This study found that porosity, permeability, and TOC content are highly correlated with lithofacies.
Article
Multidisciplinary Sciences
Yingying Xu, Xiangui Liu, Zhiming Hu, Xianggang Duan, Jin Chang
Summary: This paper proposes a theoretical production prediction model and verifies its accuracy with actual data. The research findings show that the net producible reserves of a single well can be increased by about 30% using the managed pressure drawdown approach. Furthermore, an optimization strategy for pressure drawdown is presented to improve economic benefits.
SCIENTIFIC REPORTS
(2022)
Article
Energy & Fuels
Atheer Dheyauldeen, Huda Alkhafaji, Dheiaa Alfarge, Omar Al-Fatlawi, Mofazzal Hossain
Summary: This study analyzed the linear flow data in unconventional gas wells and provided guidance on estimating parameters such as fracture half-length using analytical methods and correction techniques. The results showed that different methods and correction techniques have different accuracy in estimating fracture half-length under different conditions.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Civil
Peng Hu, Shaoyang Geng, Xianshan Liu, Chengyong Li, Runhua Zhu, Xing He
Summary: In this paper, a three-dimensional numerical model based on the embedded discrete fracture model (EDFM) was proposed for transient pressure analysis of multi-stage fractured horizontal wells (MFHWs) in shale gas reservoirs. This model considers the adsorption effect, stress sensitivity, and high-velocity non-Darcy flow in fractures of shale gas. The model was solved by Matlab Reservoir Simulation Tool (MRST) and provides a better explanation for the pressure response behavior of fluid in shale gas reservoirs.
JOURNAL OF HYDROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Wei Zhipeng, Wang Jinwei, Liu Rumin, Wang Tao, Han Guannan
Summary: By studying parameters such as design length, number of fracturing segments, and fracture half-length in horizontal wells, the efficiency of development in extremely high-condensate shale gas reservoirs can be optimized. Increasing fracture half-length and utilizing staggered distribution patterns can help improve production capacity.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Sulaiman A. Alarifi
Summary: This study provides a comprehensive overview and analysis of the productivity of 1216 recently abandoned multi-stage hydraulically fractured horizontal wells from five shale formations in the United States. The research utilized two decline curve analysis (DCA) methods to match actual production data, resulting in accurate production forecasts using limited early production data. By developing universal decline parameters and conducting hindcasting, the study offers insights into the production behaviors and key performance indicators of similar wells from different shale formations.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Zhihong Zhao, Liang Tao, Jianchun Guo, Yuhang Zhao, Chi Chen
Summary: This study proposes a shut-in time optimization approach based on a novel wettability index and mineral content curve, which determines the optimal shut-in time for different shale reservoirs. The experimental results show that clay content is a key factor affecting shale wettability.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
Wenrui Shi, Chaomo Zhang, Shu Jiang, Yong Liao, Yuanhui Shi, Aiguo Feng, Steven Young
Summary: This study analyzes the pressure-boosting stimulation pattern and prediction method in the Fuling shale gas field, finding that this pattern can improve gas transmission capacity, maintain production, and increase recovery. The Blasingame analysis method can effectively predict production changes over the next decade. The research results provide valuable guidance for improving gas recovery in the Fuling and similar shale gas fields.
Article
Energy & Fuels
Yunfeng Xu, Guanglong Sheng, Hui Zhao, Yanni Hui, Yuhui Zhou, Jialing Ma, Xiang Rao, Xun Zhong, Jie Gong
Summary: In this study, fractal theory was used to characterize heterogeneous fractures in shale gas reservoirs, leading to the establishment of a mathematical model considering fractal-induced fracture distribution and gas-water two-phase flow. The meshless weighted least squares (MWLS) method was applied for the numerical simulation in multi-fractured horizontal wells, showing higher efficiency compared to existing methods. The influences of fracture distribution, initial water saturation, and reservoir reconstruction degree on gas-water production were systematically compared and analyzed, indicating that a densely distributed fracture network leads to better production efficiency.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Environmental
Daniel H. Cusworth, Riley M. Duren, Andrew K. Thorpe, Winston Olson-Duvall, Joseph Heckler, John W. Chapman, Michael L. Eastwood, Mark C. Helmlinger, Robert O. Green, Gregory P. Asner, Philip E. Dennison, Charles E. Miller
Summary: The Permian Basin is the largest and fastest growing oil and gas producing region in the US, with 1100 unique methane emission sources identified through airborne surveys. Most emissions come from O&G production, and frequent high-resolution monitoring is needed to accurately pinpoint persistent leaks.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Engineering, Chemical
Bihua Xu, Shuo Yang, Bin Yuan, Lu Ma, Leding Wang
Summary: Casing deformation caused by fault and fracture sliding during fracturing is a growing concern, especially in the shale gas blocks of Changning-Weiyuan-Zhaotong. Shear deformation is the dominant form, and factors such as weakened casing strength, geological factors, cement quality, and fracturing engineering contribute to casing deformation. Optimizing well trajectory, improving casing strength and cementing quality, or optimizing fracturing operation can help reduce casing deformation.
Review
Energy & Fuels
Yiming Zhang, John Wang
Summary: Coriolis, turbine, V-cone, and orifice meters are commonly used in shale gas production measurement, but high flow rates, pressures, and gas composition changes in shale gas wells may affect volumetric measurement accuracy. Therefore, investigating and improving metering technologies in shale gas wells is critical.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Environmental Sciences
Shengjun Yang, Biao Zhang, Qian Song, Yi Liang, Xiangying Zeng, Zhiqiang Yu
Summary: This study analyzed the levels of 50 trace elements in a river in the Sichuan Basin, China, that receives effluent from a shale gas wastewater treatment facility. The results showed elevated concentrations of 16 shale gas wastewater-related elements in the surface water samples from the effluent discharge site compared to the upstream background level. The accumulation of Sr, Ba, Li, and Cs in riverbed sediments near and/or downstream of the effluent discharge site may contribute to elevated pollution levels of Sr and Li. The ecological risk of the riverbed sediments was medium to high, with Cd posing the highest risk. The potential risk of shale gas wastewater-related elements throughout the river was low.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Xuewei Liu, Dongping Li, Yunpeng Jia, Yang Liyong, Gou Xiaoting, Zhao Tao, Chen Ziwei, Li Mao, Wang Juan, Sui Xiangyun, Zhao Donghua, Tang Hongxia, Li Yulin, Zhang Yu
Summary: A fuzzy comprehensive production evaluation model for fractured shale oil horizontal wells is proposed in this paper based on the random forest algorithm and coordinated principal component analysis. The fracturing parameters of the target wells are optimized using this model in combination with an orthogonal experimental design. The main controlling factors of production in fractured horizontal wells in shale oil are identified using the random forest algorithm. Principal component analysis is used to reduce the dimensions of these factors, and the fuzzy statistics and assignment methods are used to establish the membership function of the reduced main control factors. The fuzzy comprehensive evaluation method is then used to score and evaluate the effect of fractured horizontal wells, and the optimized parameter design considering the comprehensive action of multiple parameters is achieved.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Huijun Wang, Lu Qiao, Shuangfang Lu, Fangwen Chen, Zhixiong Fang, Xipeng He, Jun Zhang, Taohua He
Summary: A new gas production prediction methodology based on GPR and CNN was proposed to achieve rapid optimization. By sensitivity analysis and experimental design, a gas production model was developed, achieving satisfactory prediction performance and maximizing NPV while determining optimal parameters.
FRONTIERS IN EARTH SCIENCE
(2021)
