Article
Energy & Fuels
Bao Jia, Cheng-Gang Xian
Summary: In this study, a pulse-decay experiment was conducted on a fractured shale core, and the 3D embedded discrete fracture model was used to simulate the experiment process. The impact of nanopore confinement on flow behavior in the fracture-matrix system was discussed.
Article
Energy & Fuels
Zequan Li, Ruimin Feng, Jun Liu, Rohit Pandey
Summary: This study proposes a simplified pulse decay method with only a single downstream reservoir to replicate in situ conditions for reservoir fluid flow and determine the effective porosity and permeability of core samples accurately. Experimental results demonstrate that the single downstream reservoir PDM can better simulate in situ fluid flow behavior and achieve accurate measurements, extending the application of the transient technique.
ENERGY SCIENCE & ENGINEERING
(2021)
Article
Engineering, Chemical
Peng Liu, Jinyang Fan, Deyi Jiang
Summary: This study conducted a series of permeability tests on coal using the pulse-decay method for helium, CH4, and CO2 depletions under different conditions, revealing differences in permeability behavior between helium and sorbing gases, particularly with regard to the rebound effect. The results suggest that the matrix shrinkage is a main factor causing the permeability 'rebound' of sorbing gases, highlighting the importance of matrix flows in coalbed methane production.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Energy & Fuels
Yue Wang, Steffen Nolte, Zhiguo Tian, Alexandra Amann-Hildenbrand, Bernhard Krooss, Moran Wang
Summary: A modified method has been developed to simultaneously measure permeability and porosity, which ensures measurements are conducted under the same effective stress condition. The results obtained from this method agree well with those from classical methods.
ENERGY SCIENCE & ENGINEERING
(2021)
Article
Engineering, Geological
D. Grgic, M. Moumni, A. Giraud, R. de La Vaissiere, J. Talandier
Summary: This paper presents laboratory permeability tests on Callovo-Oxfordian claystone from Meuse/Haute-Marne using both steady-state and pulse decay methods. The focus is on explaining why permeability values obtained with the steady-state method are lower than those obtained with the pulse decay method and in situ measurements. The study also evaluates the influence of water chemistry and test duration on permeability values and their impact on mechanical properties.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Energy & Fuels
Xincai Cheng, Bin Zhao, Chuqiao Gao, Ying Gao
Summary: This study analyzes the permeability control factors of low-permeability tight reservoirs and establishes the correlation between the flow unit index FZI and three pore structure characterization parameters, providing a theoretical basis for the fine evaluation of low-permeability tight reservoirs.
Article
Energy & Fuels
Nanjun Lai, Jiawen Deng, Ziqiang Wang, Junqi Wang, Wenguang Guo, Lei Tang
Summary: Imbibition after fracturing is an important method for enhancing oil recovery in shale oil reservoirs. The porosity, permeability, and wettability of the reservoir in Jimsar Sag were analyzed to understand the mobility of shale oil. The experimental results showed well-developed micro nano pores, poor pore connectivity, and neutral wettability to oil wetting.
Article
Geochemistry & Geophysics
Hui Li, Zhiliang Liu, Ninghong Jia, Xu Chen, Jing Yang, Lele Cao, Ben Li
Summary: The study identified high capillary pressure as the primary damage mechanism for tight sandstone, with rock matrix cores showing higher damage degree than naturally fractured cores. The proposed procedures can be applied to identify the FFD mechanism of other tight and shale formations and provide insightful fundamental data for HFF optimization.
Article
Geochemistry & Geophysics
Peng Yu
Summary: This study predicts and characterizes the permeability of Daniudi tight gasfield in China from a new perspective using geoscience data mining algorithms and modeling techniques. The results show that the facies-controlled modeling system based on the hydrodynamic characteristics of tight gas reservoirs effectively improves reservoir prediction accuracy.
Article
Energy & Fuels
Bao Jia, Xiaojun Cui
Summary: Gas flow in micro-porous media is more complex than liquid flow, and the efficiency of gas propagation through porous media can be appropriately measured by gas pressure diffusivity instead of permeability. Pulse-decay experiments were conducted in this study to explore the relationship between gas permeability/diffusivity and experiment durations, providing consistent results in determining intrinsic permeability and gas slippage factor through a single experiment. The study also showed that pulse size affects the permeability determination more under lower pore pressure in a pulse-decay experiment.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Geological
Xuan-Xinh Nguyen, Pin -Lun Tai, Jia-Jyun Dong, Chi-Wen Yu
Summary: A novel method called pulse-decay-balance (PDB) method was proposed to measure hydraulic and mechanical apertures simultaneously under stress. The study modified the YOKO2 system into a closed system to measure the apertures of slate samples. The hydraulic aperture was determined by analyzing the pressure decay curve, while the mechanical aperture was determined by joint volume measurement. The results showed good agreement between the estimated hydraulic apertures and those measured in steady-state tests. However, neglecting the specific storage of the rock joint can induce errors in hydraulic aperture estimation.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Computer Science, Hardware & Architecture
Ning Zhao, Zhilin Li, Ludong Qin, Zhijia Cui, Zhou Sun, Zhengyong Cheng, Chunshen Jiang, Shuosheng Wang, Tingting Zhao, Yingjie Liao, Bin Wei
Summary: This study established an experimental platform to measure the brightness attenuation of each subpixel on the OLED screen using a spectrometer and an automatic mechanical system. Analysis of the data revealed that blue light has the fastest decay rate. These findings provide reference and guidance for OLED manufacturers and users.
Article
Geosciences, Multidisciplinary
F. Rashid, D. Hussein, P. Lorinczi, P. W. J. Glover
Summary: This paper focuses on the examination of natural fractures in tight carbonate reservoir rocks of the Shiranish Formation in the Taq Taq field in North Iraq. The quantification of fracture parameters contributes to understanding reservoir characteristics and potential. The study reveals that fracturing has significantly enhanced permeability in these rock types. The results also show the importance of fracture aperture size, fracture height, and fracture distance distribution in controlling fluid flow and hydrocarbon production.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Energy & Fuels
Ze Chen, Gao Li, Xu Yang, Yi Zhang
Summary: This study investigates the impact of high temperatures on the microstructure of tight sandstone formations, finding that heating to certain thresholds can significantly improve gas permeability. Electric heating is identified as a potential method for enhancing the productivity and exploitation efficiency of tight gas formations.
Article
Engineering, Chemical
Chengyong Peng, Jun Zhou, Jianshu Wu, Mao Jiang, Hao Zhang, Biao Yin, Shanyong Liu, Yan Zhang
Summary: The reservoir rocks of the Lufeng Sag in the Pearl River Mouth Basin have low porosity and low permeability, requiring hydraulic fracturing for economic production. This study analyzed the mechanical properties of tight sandstone to understand these reservoirs better and promote successful production. Through the introduction of shear/tensile strength factor and other parameters, a fracability evaluation model was established to assess the formation of complex fracture networks after fracturing. The results provide theoretical guidance and practical implications for increasing oil and gas production from tight sandstone reservoirs.
Article
Engineering, Chemical
Zehao Yang, Steven Bryant, Mingzhe Dong, Hassan Hassanzadeh
Article
Energy & Fuels
Sheng Li, Qian Sang, Mingzhe Dong, Peng Luo
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2019)
Article
Engineering, Environmental
Zehao Yang, Ali Telmadarreie, Mingzhe Dong, Steven Bryant
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Energy & Fuels
Zehao Yang, Steven Bryant, Mingzhe Dong
Article
Engineering, Chemical
Wei Lv, Houjian Gong, Yajun Li, Qian Sang, Long Xu, Mingzhe Dong
CHEMICAL ENGINEERING SCIENCE
(2020)
Article
Chemistry, Multidisciplinary
Qian Sang, Xinyi Zhao, Elsayed Abdelfatah, Steven L. Bryant, Mingzhe Dong
Summary: The dispersibility and stabilization of silica nanoparticles with surface-capped PVAc chains in CO2 with different cosolvents were examined, revealing that the cosolvent is the key factor in dispersing the particles. 1-Butanol was found to be an effective cosolvent for dispersing silica-PVAc nanoparticles in CO2.
Article
Computer Science, Interdisciplinary Applications
Xinyi Zhao, Qian Sang, Jingsheng Ma, Hemanta Sarma, Mingzhe Dong
Summary: This study introduces a systematic method for determining the cohesion and adhesion parameters in multicomponent and multiphase models from a physical perspective. By matching interfacial tensions and contact angles, the parameters for water/alkane systems and water/alkane interacting with silicon dioxide are determined, with an improved equation proposed for predicting adhesion parameters. The study also investigates the impact of these parameters on the advancing and receding angles of oil slugs in capillary tubes during the movement initialization process.
COMPUTERS & FLUIDS
(2021)
Article
Energy & Fuels
Xinyi Zhao, Qian Sang, Yajun Li, Longyang Shi, Huimin Liu, Mingzhe Dong
Summary: The study revealed a new phenomenon in shale samples, where oil is squeezed out from organic matter into surrounding inorganic matrix when the effective stress of organic matter reaches a threshold value. The experimental results validated the proposed model describing the mechanisms of mobilizing the oil in organic matter.
Article
Energy & Fuels
Shaojie Zhang, Qian Sang, Mingzhe Dong
Summary: The study found that pressure significantly impacts the permeability and porosity of shale samples, with pore shape playing a significant role in pressure sensitivity. Different pore shapes lead to variations in the response of permeability and porosity to pressure. Additionally, gas diffusion coefficients and slippage factors were also measured, showing complex relationships with pore pressure and confining pressure.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Xinyi Zhao, Qian Sang, Yajun Li, Huimin Liu, Mingzhe Dong
Summary: This study investigated the CO2-kerogen interaction using molecular dynamics simulation, revealing that the strong affinity of CO2 to kerogen leads to efficient hydrocarbon extraction and CO2 storage in kerogen. Analysis of pressure, temperature, hydrocarbon composition, and kerogen type provided insights into enhancing hydrocarbon recovery and CO2 sequestration in shale formations. Field application methods were proposed for evaluating the enhanced recovery and storage capacity of shale formations.
Article
Engineering, Petroleum
Boxin Ding, Qian Sang, Zhiquan Nie, Zhaowen Li, Mingzhe Dong, Zhangxin Chen, Apostolos Kantzas
Summary: This paper improves an oil-in-water emulsion-based conformance control method through newly designed flow tests and optimized modeling study. It proposes and examines optimal conformance control strategies in a 2D model with a high water mobility zone and a low water mobility zone, separated by a horizontal injection well to simulate real oil sands with lean zones and horizontal wells. The newly developed model incorporates characteristics of the emulsion and heterogeneous porous media through the introduction of experimentally derived permeability reduction coefficients.
Article
Energy & Fuels
Xinyi Zhao, Qian Sang, Yajun Li, Huimin Liu, Zheng Li, Yali Liu, Mingzhe Dong
Summary: This study presents an analytical method for calculating the dynamic effective permeability of laminated structures considering cross flow between laminae in transient flow processes, which can be used for accurate modeling of transient flow in reservoir simulations. The effects of horizontal permeability, vertical permeability, lamina thickness, and matrix length between fractures on effective permeability are also investigated in the study.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Qian Sang, Xinyi Zhao, Yali Liu, Zheng Li, Mingzhe Dong
Summary: This study investigates the effects of pore size and wettability heterogeneities in laminated shale oil formations on oil/water flow using the lattice Boltzmann method. The results show that the content and hydrophobicity of organic matter can affect oil production, and different relative permeabilities of mudstone and sandstone laminae can lead to errors in production calculations.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Qian Sang, Xinyi Zhao, Mingzhe Dong
Summary: Understanding the behavior of gas-water two-phase flow in shale gas formations is crucial for reservoir simulation and production optimization. Molecular simulation shows that water can significantly affect gas flow velocities in different types of nano-slits in shale reservoirs due to its interaction with the walls and gas molecules.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Qian Sang, Xin-Yi Zhao, Hui-Min Liu, Ming-Zhe Dong
Summary: This study investigates the dynamics of n-alkane molecules penetrating into kerogen slits through molecular dynamics simulations. Results show that the molecular structure and motion dominate the molecular transportation of n-alkanes, and the space-confinement conformational changes slow down the filling speeds in narrow slits. Short-chain alkanes and high temperature facilitate the flow of alkane mixtures in the slits.