Article
Chemistry, Multidisciplinary
Jiangtao Li, Xiaofeng Zhou, Xibao Liu, Abdumalik Gayubov, Sultanov Shamil
Summary: Tight gas reservoirs with microscale pores and fractures have a significant impact on the productivity of gas wells. The influence of microscale gas flow on the well testing model of fractured horizontal wells has not been studied systematically. In this paper, the coupling influence mechanism of multicomponent gas effect-fracture geometry characteristics is explained, and a seepage model coupling the flow in the fracture and the flow in the gas reservoir is established. Additionally, an unsteady pressure analysis model for fractured horizontal wells in tight gas reservoirs is developed.
Article
Chemistry, Multidisciplinary
Tianyu Wang, Qisheng Wang, Jing Shi, Wenhong Zhang, Wenxi Ren, Haizhu Wang, Shouceng Tian
Summary: This study introduces MLP and LSTM networks for predicting shale gas production, which show high accuracy under different geological and fracturing conditions, and have the potential to provide effective means for shale gas productivity prediction.
APPLIED SCIENCES-BASEL
(2021)
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
Energy & Fuels
Li Wu, Jiqun Zhang, Deli Jia, Shuoliang Wang, Yiqun Yan
Summary: This paper reviews six fracturing technologies adopted in Block M of the Ordos Basin, compares their field application effects from technical and economic perspectives, determines the main factors affecting the productivity of fractured horizontal wells using the entropy method, and constructs a comprehensive productivity impact index (CPII) that correlates with the single-well production of fractured horizontal wells. It provides a simple and applicable method for predicting the performance of multi-frac horizontal wells.
Article
Energy & Fuels
Xinchen Gao, Kangliang Guo, Peng Chen, Haoran Yang, Guowei Zhu
Summary: This study developed a productivity prediction model for multi-fractured horizontal wells in tight oil reservoirs considering fracture closure. The model was solved using various transforms and numerical inversion methods. The study found that the values of hydraulic fracture parameters should be within a reasonable range, and fracture closure pressure has a significant impact on the production of tight oil reservoirs. The influence of fracture conductivity on production has a clear threshold.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
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)
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
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
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
Chemistry, Multidisciplinary
Yahui Li, Yihan Feng, Jibin Zhong, Wei Wang
Summary: This study proposed a new method for predicting the productivity of open-hole horizontal gas wells in gas reservoirs with closed bottom and top boundaries. The method demonstrated high accuracy in predicting well productivity, with a relative error of only 1.03% for absolute open flow rates, showing significant guiding significance for the development of horizontal wells in such reservoirs.
Article
Energy & Fuels
Yaxi Xie, Yongming He, Yihang Xiao, Tao Jiang
Summary: Tight reservoirs have low permeability and require multistage fractured horizontal wells for economic production. This study proposes a discrete fracture model to simulate reservoir deformation and fluid flow simultaneously. The results show that the coupling of flow and geomechanics significantly affects the evolution of physical parameters in the formation.
JOURNAL OF ENERGY ENGINEERING
(2022)
Article
Energy & Fuels
Yi Zeng, Xiao-Qiang Bian, Jia-Qi Li, Hao-Lei Yang
Summary: This study presents a productivity model for tight gas reservoirs in hydraulic fracturing horizontal wells, taking into account various influencing factors. The accuracy of the model is verified and a sensitivity analysis is conducted to determine the impact of different factors on productivity.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
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
Energy & Fuels
Jonathan Garcez, Luis F. Ayala
Summary: This paper presents a new Green's function-based type curves method for analyzing rate transient data from multi-fractured horizontal wells in unconventional gas reservoirs. After verification through 36 case studies, the proposed method shows good reliability.
Article
Energy & Fuels
Tianyue Guo, Bin Huang, Wanfu Zhou, Cheng Fu, Xu An, Tingting Zhu, Qingyuan Li, Hang Yang
Summary: Volcanic gas reservoirs, as new exploration and development fields, are rich in resources but have complex storage and permeability modes. This study uses Xushen low-permeability volcanic gas reservoirs as examples to improve prediction accuracy of fractured horizontal well productivity through the principle of equal flow, considering various factors affecting production.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)