Article
Engineering, Chemical
Yang Cheng, Ruidong Wu, Ruiquan Liao, Zilong Liu
Summary: This study simulated the gas-liquid production conditions of the Donghai gas field with indoor experiments and systematically analyzed flow patterns for different pipe diameters, inclinations, and flow patterns. A new pressure drop calculation model was established, improving the accuracy of wellbore pressure distribution calculation.
Article
Thermodynamics
Peng Deng, Zhangxin Chen, Xiaolong Peng, Jianfeng Wang, Suyang Zhu, Haoming Ma, Zhengbin Wu
Summary: This study focuses on the Dalaoba condensate underground gas storage (CUGS) in China and establishes a dynamic pseudo-component model. Results show that the dynamic pseudo-component model accurately represents the process of thermodynamic property changes during natural gas injection, and provides insights for stable and efficient natural gas storage and supply in CUGS.
Article
Energy & Fuels
Mina S. Khalaf, Noha Soliman, Ahmed H. El-Banbi
Summary: Wellbore storage (WBS) is caused by fluid loading/unloading in the wellbore, resulting in variable sandface rate and time lag between surface production rate and stable sandface rate. The removal of WBS effects can recover important reservoir features and improve reservoir model identification and parameters calculation. The proposed stable technique can eliminate WBS effects in gas wells, with applications in various gas reservoirs for optimizing well/reservoir performance.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Chemical
Hao Xu, Jifei Cao, Leifeng Dong, Chuanliang Yan
Summary: The use of multilateral wells is an important method for developing complex oil reservoirs. In this study, a finite element analysis (FEA) model was established to analyze the wellbore stability of multilateral wells and investigate the effects of wellbore parameters and drilling fluid density. Simulation results show that the wellbore diameter has insignificant influence on wellbore stability. Increasing the angle between the main wellbore and branches to 45 degrees improves wellbore stability, and beyond 45 degrees, the region prone to wellbore instability shifts to the inner of multilateral wellbores. When the azimuth of wellbores aligns with the direction of the minimum horizontal principal stress, the wellbores are most stable. Furthermore, increasing the drilling fluid density can effectively reduce the risk of wellbore instability at the multilateral junctions.
Article
Energy & Fuels
Bowen Shi, Jiajun Hong, Zhihua Wang, Zhenbo Chang, Feng Li
Summary: This study investigates the behavior of paraffin deposition in gas-condensate wells through experiments and analysis, and establishes a paraffin deposition identification chart. The results show that paraffin crystal modifiers have a better preventive effect, achieving a paraffin prevention rate of 85-95%.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Wenqi Ke, Wei Luo, Shiyu Miao, Wen Chen, Yaodong Hou
Summary: Capacity prediction is crucial for optimizing oil and gas well production systems and parameter design, especially for horizontal wells. This article introduces a method and process of establishing a transient calculation model for two-phase flow in horizontal wells, which includes fluid physical properties, reservoir oil and gas two-phase seepage, and the coupling model of inflow performance and flow in the wellbore. The model is verified to be reliable using production data from five wells in two oilfields. Compared to other reservoir numerical simulation methods, this model simplifies the reservoir model, does not involve complex meshing, and only simulates one well, resulting in faster calculation speed under the same conditions.
Article
Geosciences, Multidisciplinary
Haifeng Wang, Haichuan Li, Zhongxin Ren
Summary: This study establishes a wellbore multiphase flow model to predict salt formation in underground gas storage with high-salinity formation water. The model considers the evaporation of formation water and the deposition of salt. Sensitivity analysis is conducted to investigate the impact of various factors on salt formation. The model performs well in estimating salt precipitation location and timescale, providing valuable guidance for salt mitigation strategies and gas well production management in underground gas storage.
Article
Energy & Fuels
Hongying Zhu, Yaoguang Qi, Hao Hu, Fenna Zhang, Chuankai Jing, Junwei Zhao
Summary: In coal seam gas coproduction wells, the interlayer interference in the wellbore seriously affects gas production. A method of adjusting coproduction flow pressure by regulating the wellhead pressure and dynamic fluid level can effectively suppress the interlayer interference.
Article
Energy & Fuels
Shihui Sun, Ruili Sang, Jiahao Liu, Kang Zhao, Tao An
Summary: Analyzing gas-liquid phase changes in the drilling wellbore is of great practical significance for achieving well control safety. The distribution of gas and liquid after phase transition is closely related to the system original density, which directly determines the flow pattern and accurate prediction of wellbore pressure.
Article
Energy & Fuels
Youyou Cheng, Chunqiu Guo, Chengqian Tan, Pengyu Chen, Haidong Shi, Yuzhong Xing
Summary: This study investigates the stress sensitivity of carbonate gas reservoirs and finds that abnormally high pressure and fractures enhance the stress sensitivity. A mathematical model is developed to calculate the gas well deliverability in abnormally pressured carbonate gas reservoirs with developed fractures, revealing that previous methods have overestimated the stress sensitivity.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Energy & Fuels
Chaoping Mo, Guangdong Zhang, Zhiwei Zhang, Yihong Yuan, Sen Yang
Summary: This study focuses on the calculation model of fracture horizontal well productivity considering phase changes. By modifying the existing productivity equations for horizontal wells and combining them with the equation of state, the productivity changes during actual production processes are described. Example calculations demonstrate the significant influences of fracture number and conductivity on productivity. The proposed model can be used to calculate the open flow rates of gas wells and the amount of condensate oil in fractured horizontal well gas reservoirs, providing references for gas reservoir production mode selection and fracture parameter optimization.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Mathematics, Applied
Argha Debnath, Ayan Khan, Boris Malomed
Summary: This study investigates the static and dynamical properties of one-dimensional quantum droplets under the influence of local potentials in the form of narrow wells and barriers. The dynamics of the droplets are described by the one-dimensional Gross-Pitaevskii equation, including meanfield and beyond-mean-field terms. Stable solutions for localized states pinned to the well are found, and approximations for the well and the collision of the droplet with the barrier are developed. Simulations analyze the collisions of droplets with the wells and barriers, identifying outcomes such as fission and rebound effects.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Energy & Fuels
Yi Wu, Jianliang Zhou, Jin Yang, Tianwei Zhang, Xin Zou, Xingquan Zhang, Guoxian Xu
Summary: This paper proposes a deepwater high-pressure oil and gas well annular pressure analysis method considering formation connectivity, systematically analyzes and explains the differences between various types of annular pressure management and control technology, and proposes the annular pressure management and control technology of deepwater high-pressure oil and gas wells accordingly. At the same time, through the analysis of an actual case of a deepwater high-pressure well in the South China Sea, the appropriate management and control methods of annular pressure are recommended. This paper systematically summarizes and studies the analysis and control technology of annular pressure in deepwater high-pressure oil and gas wells, which provides a technical basis for China's transition from conventional deepwater to deepwater high-pressure, and can provide a reference for the management and control of annular pressure in oil and gas wells in subsequent deepwater projects.
Article
Engineering, Chemical
Nian-Hui Wan, Li-Song Wang, Lin-Tong Hou, Qi-Lin Wu, Jing-Yu Xu
Summary: A transient model using the finite difference method to simulate temperature and pressure in CO2 injection wells is proposed. The maximum error between simulated and measured results is 5.04%. The phase state is primarily controlled by the wellbore temperature, and increasing injection temperature or decreasing injection rate can help achieve the supercritical state.
Article
Energy & Fuels
Zhihua Wang, Bowen Shi, Yang Song
Summary: This study investigates the effect of operating conditions on wax/asphaltene deposition behavior in gas condensate reservoirs by using a cold plate device. The results show that the growth rate of wax deposition thickness initially stabilizes, then rises again, and finally slows down. On the other hand, the deposition rate of asphaltene is stable at first, then increases significantly, and gradually decreases after reaching the peak value. A diagram is developed to identify the deposition location in the wellbore, facilitating the removal of wax/asphaltene during production.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
Zheng Sun, Juntai Shi, Keliu Wu, Tao Zhang, Dong Feng, Liang Huang, Yongbo Shi, Hariharan Ramachandran, Xiangfang Li
CHEMICAL ENGINEERING SCIENCE
(2019)
Article
Energy & Fuels
Tao Zhang, Xiangfang Li, Ying Yin, Minxia He, Qing Liu, Liang Huang, Juntai Shi
Article
Energy & Fuels
Rongrong Qi, Zhengfu Ning, Qing Wang, Liang Huang, Xiaojun Wu, Zhilin Cheng, Wentong Zhang
Article
Engineering, Chemical
Juntai Shi, Zheng Sun, Keliu Wu, Ke Wang, Liang Huang, Wenyuan Liu, Xiangfang Li
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2019)
Article
Energy & Fuels
Wentong Zhang, Zhengfu Ning, Biao Zhang, Qing Wang, Zhilin Cheng, Liang Huang, Rongrong Qi, Xiongtao Shang
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2019)
Article
Energy & Fuels
Liang Huang, Zhengfu Ning, Qing Wang, Rongrong Qi, Zhilin Cheng, Xiaojun Wu, Wentong Zhang, Huibo Qin
Article
Geosciences, Multidisciplinary
Xiaojun Wu, Zhengfu Ning, Guoqing Han, Qing Wang, Ziyao Zhong, Rongrong Qi, Zhilin Cheng, Liang Huang
ARABIAN JOURNAL OF GEOSCIENCES
(2019)
Article
Chemistry, Physical
Xiao-Jun Wu, Zheng-Fu Ning, Zhi-Lin Cheng, Qing Wang, Rong-Rong Qi, Liang Huang, Wen-Tong Zhang
APPLIED SURFACE SCIENCE
(2019)
Article
Energy & Fuels
Xiaojun Wu, Zhengfu Ning, Rongrong Qi, Qing Wang, Liang Huang
Article
Energy & Fuels
Liang Huang, Zhengfu Ning, Qing Wang, Rongrong Qi, Zhilin Cheng, Xiaojun Wu, Wentong Zhang, Huibo Qin
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2019)
Article
Energy & Fuels
Liang Huang, Atefeh Khoshnood, Abbas Firoozabadi
Article
Chemistry, Multidisciplinary
Wentong Zhang, Zhengfu Ning, Zhilin Cheng, Qing Wang, Xiaojun Wu, Liang Huang
Article
Geochemistry & Geophysics
Yunchao Pu, Yanchun Wang, Juntai Shi, Keliu Wu
Article
Geochemistry & Geophysics
Jianfa Wu, Xuefeng Yang, Shan Huang, Shengxian Zhao, Deliang Zhang, Jian Zhang, Chunyu Ren, Chenglin Zhang, Rui Jiang, Dongchen Liu, Qin Yang, Liang Huang
Summary: This study constructed molecular models of nanopores for major rock constituents in deep shale and simulated the microscopic adsorption behavior of methane. The effects of rock constituents on methane adsorption were discussed. The study elucidated the discrepancies in microscopic water distribution characteristics between illite and kerogen nanopore models, revealed the effects of water on methane adsorption and its underlying mechanisms, and elaborated on the competitive adsorption characteristics between water and methane. The results showed a similar trend in the microscopic distribution of methane between different shale rock constituents. Illite and kerogen slit pores had no significant difference in methane adsorption capacity. The adsorption capacity per unit mass of kerogen was greater than that of illite due to the smaller molar mass of the kerogen skeleton and its large intermolecular porosity. Illite had a greater affinity for water than methane. With increasing water content, water molecules preferentially occupied the high-energy adsorption sites and then overspread the entire pore walls to form water adsorption layers. Methane molecules were adsorbed on the water layers, and methane adsorption had little effect on water adsorption. Kerogen was characterized as mix-wetting. Water molecules were preferentially adsorbed on polar functional groups and gathered around to form water clusters. In kerogen with high water content, methane adsorption could facilitate water cluster fusion and suppress water spreading along pore walls. In addition to adsorption, some water molecules dissolved in the kerogen matrix.
Editorial Material
Environmental Sciences
Liang Huang