
样式: 排序: IF: - GO 导出 标记为已读
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Prediction of maximum slug length considering impact of well trajectories in British Columbia shale gas fields using machine learning J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-08-07 Sungil Kim, Youngwoo Yun, Jiyoung Choi, Majid Bizhani, Tea-woo Kim, Hoonyoung Jeong
In this study, the severity of slugging is assessed by predicting maximum slug lengths (MSL) quickly using the random forest (RF) algorithm based on the geometric features of well trajectories for a shale gas field. Severe slugging is one of the critical issues production engineering-wise because it causes operation shut-down. Thus it should be predicted for proactive measurements. A total of 5033
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Construction of selective gas permeation channels in polymeric membranes using nanocage tuned ionic liquid/MIL-53 (Al) filler nanoparticles for effective CO2 separation J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-08-08 B. Sasikumar, G. Arthanareeswaran
Polymeric membranes with metal-organic frameworks (MOFs) holds great potential for gas separation. However, finely tailoring the adhesion between MOFs and polymer matrices is crucial in reducing the membranes defective structure. The partial inorganic structure of MOFs limits the interaction with the polymer matrix, which tends to agglomerate on the membranes. Herein, an interfacial strategy is reported
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Investigating the micro-turbulent corrosion mechanism of pipeline defects based on a combined experimental and simulation approach J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-08-10 Liuyang Yang, Dalei Zhang, Haiming Fan, Zhuowei Tan, Shaohua Xing, Xiaorui Guan, Xiu Jiang
The existence of pipeline defects in oil and gas gathering pipelines predisposed the pipeline to rupture under the synergistic effects of local micro–turbulence and electrochemical corrosion. Here, a combination of experimental and simulation methods was proposed to facilitate the investigation of CO2 corrosion and the mass transfer process in pipeline defects. The corrosion kinetic characteristics
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Three-dimensional anisotropy modelling and simulation of gas hydrate borehole-to-surface responses J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-08-09 Busayo Oreoluwa Omisore, Olalekan Fayemi, Eric Thompson Brantson, Sheng Jin, Ebenezer Ansah
Electromagnetic (EM) methods have provided an alternative means of detecting and estimating gas hydrate, especially in places where hydrates have been established to exist but the gas hydrate shows no bottom-simulating reflection. However, most EM numerical studies being done focused on surface/seafloor Controlled Source Electromagnetic (CSEM) studies with little consideration for borehole EM studies
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Microbial H2S generation in hydrocarbon reservoirs: Analysis of mechanisms and recent remediation technologies J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-08-05 Haithm Salah Hagar, Jalal Foroozesh, Sunil Kumar, Davood Zivar, Negar Banan, Iskandar Dzulkarnain
Sulphate reducing prokaryotes (SRP) cause hydrogen sulphide (H2S) generation in some waterflooded hydrocarbon reservoirs that is known as microbial reservoir souring or biosouring. The H2S generated in-situ by SRP is toxic and corrosive that adversely affects the quality, production, and economy of oil fields together with negative environmental impacts. Various chemical, biological, and microbial
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Experimental and modeling studies of gas-liquid flow in vertical pipes at high superficial gas velocities J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-08-05 Rida Elgaddafi, Ramadan Ahmed, Raj Kiran, Saeed Salehi, Olawale Fajemidupe
In many oilfield applications, gas-liquid (GL) flow modeling is required. One of these applications is predicting the uncontrolled hydrocarbon flow through a wellbore after a blowout, referred to as the worst-case discharge rate (WCD rate). It is common to see annular flow patterns in a wellbore during a blowout, especially when the superficial gas velocity (Vsg) is high and the superficial liquid
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Permeability changes in mining-damaged coal: A review of mathematical models J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-08-07 Shouqing Lu, Mingjie Li, Yankun Ma, Shengcheng Wang, Wei Zhao
Coal seam gas drainage is not only the effective measure for gas outbursts control, but also has the great significance for the use of gas energy and reduction of greenhouse-gas emissions. Coal permeability is the key parameter of gas drainage, and the permeability model of mining-damaged coal has the important theoretical guidance value for gas drainage in low permeability coal seams. In order to
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Transient analysis of horizontal wells with multiple fractures in sour gas reservoirs J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-08-02 Bo Fang, Jinghong Hu, Xiaodong Wang, Yuan Zhang
Due to the decrease of reservoir pressure, the elemental sulfur deposits in sour gas reservoirs, leading to the reduction in the reservoir porosity and permeability. It can also impact the transient pressure and rate behavior of gas wells, which is always reflected in pressure and flow rate type curves. However, few studies focus on transient analysis of multi-fractured horizontal wells affected by
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Scaling analysis for a 3-D CO2 plume in a sloping aquifer at a late stage of injection J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-08-02 Andrey Afanasyev, Elena Vedeneeva, Sergey Grechko
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Optimization and performance evaluation of a novel anhydrous CO2 fracturing fluid J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-08-02 Mingwei Zhao, Shichun Liu, Yang Li, Zhiyuan Liu, Yining Wu, Xin Huang, Ruoqin Yan, Caili Dai
The conventional water-based fracturing fluids have such defects as large water consumption, serious environmental pollution and water-sensitive damage to reservoirs in the development of tight oil. In this study, a novel anhydrous CO2 fracturing fluid system was constructed with the compositions of 7 wt% polydimethylsiloxane (100 cs), 5 wt% ethanol and 88 wt% liquid CO2. The viscosity of the system
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Differences in micromechanical properties of shales from different depositional environment: A case study of Longmaxi marine shale and Yanchang continental shale using nanoindentation J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-30 Yiyu Lu, Qi Cheng, Jiren Tang, Wenchuan Liu, Honglian Li, Jie Liu, Zijie Xu, RongRong Tian, Xiao Sun
An understanding of the mechanical properties of reservoir shale is of great significance for the efficient development of shale gas. Both marine and continental shale gas reservoirs in China have considerable development potential, but their different depositional environments may lead to substantial differences in their mechanical properties, which can result in production efficiency differences
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Experimental investigation on inorganic scaling induced by the shale reaction with oxidation solution J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-31 Jiaxin Shao, Yili Kang, Lijun You, Na Jia, Mingjun Chen
Inorganic scale produced from shale reservoir oxidation during hydraulic fracturing will block pores and fractures, thus hindering the multi-scale transportation of shale gas. The results show that the cations produced after soaking in distilled water mainly consisted of Ca2+, Mg2+, Na+, K+ and Fe2+. Pyrite and chlorite contain reduced Fe, and the oxidized solution dissolves the reduced iron in shale
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Statistical and neural network analysis of the relationship between the stochastic nature of pore connectivity and flow properties of heterogeneous rocks J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-19 Olubukola Ishola, Aaron Alexander, Javier Vilcáez
We used a stochastic 3D pore-scale simulation approach to statistically elucidate the effect of stochastic pore connectivity on permeability and hydraulic tortuosity of highly heterogeneous porous media such as carbonate rocks. The novel nature of our workflow lies in the generation of multiple 3D pore microstructures of the same effective porosity, pore size distribution, number of pores, but different
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Dynamic response model and equivalent solution method of large-diameter buried energy transportation pipeline under moving load J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-20 Qian Xu, Gang Yang, Zhuorui Li, Zhenwei Zou, Qiang Zheng, Liqiong Zhong, Xingli Chen, Nevzat Akkurt, Yanping Du, Yaxuan Xiong, Yujie Qiang
Long-distance energy pipeline pass under roads, subjecting them to repeated stress and posing pipeline safety problems. To simulate the effects of vehicles driving over energy transmission pipeline, this paper examines large-caliber buried pipelines in the suburbs. In this study, a mechanical action model of vehicle-soil-pipeline (VSP) interactions to transform the process of a vehicle driving into
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A comparative study on outlier detection techniques for noisy production data J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-19 H.S. Jha, A. Khanal, H.M.D. Seikh, W.J. Lee
Decline curve analyses (DCA) and rate transient analyses (RTA) are widely used to characterize the fluid flow through porous media and forecast future production. Oil and gas production data are routinely analyzed for history matching and optimizing the well stimulation methods in hydrocarbon exploration and production lifecycle. However, outliers add significant uncertainty and non-uniqueness to results
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Molecular hydrogen from organic sources in geological systems J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-16 Nicolaj Mahlstedt, Brian Horsfield, Philipp Weniger, David Misch, Xiangyun Shi, Mareike Noah, Christopher Boreham
We have recently shown that molecular hydrogen generation from organic matter occurs at high maturity levels (vitrinite reflectance 3–5%) in Lower Cretaceous shales of the Songliao Basin. To evaluate and extend these implications to a wider range of source rock types and organofacies, we report on two Paleozoic maturity suites from Australia, namely the Permian Patchawarra Formation (fluviodeltaic;
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A regional study of the fugitive methane emissions from the gas distribution system in Iran by direct measurement J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-16 Hamid Reza Afshoun, Seyed Mehdi Jabbari, Hossein Jalaei Salmani
Global warming is a major concern of today's world that mostly stems from greenhouse gases (GHG) emissions among which methane (CH4) has the second highest potential to cause such a problem. Among various types of discharging CH4 into atmosphere, fugitive emission from the natural gas (NG) supply chain has a significant contribution. In this study, methane emission from the pressure reduction station
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A high-temperature-resistant and metallic-crosslinker-free fracturing fluid based on guar gum/montmorillonite nanocomposite J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-19 Ying-Xian Ma, Yu-Rou Du, Cun-Hu Zou, Jie Lai, Le-Yao Ma, Jian-Chun Guo
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Investigation of through-casing borehole acoustic reflection imaging with a dipole source: Modeling and field application J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-15 Zhen Li, Sheng-Qing Lee, Qiaomu Qi, Yuan-Da Su, Xing-Jian Wang
In view of most wells are completed by casing pipe in oil & gas exploration and development process, it is imperative to extend the application of borehole acoustic reflection imaging (BARI) from open to cased boreholes. To understand the characteristics of signals in borehole acoustic imaging, we study the radiated and reflected elastic waves in an open and cased borehole through numerical simulations
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Adsorbents selection for the enrichment of low-grade methane coal mine emissions by temperature and pressure swing adsorption technologies J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-19 David Ursueguía, Eva Díaz, Salvador Ordóñez
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Effect of structural features of sedimentary cover on gas composition of permafrost table in northern West Siberia J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-19 Vitaliya O. Naumenko, Mikhail D. Zavatsky, Aleksey A. Nezhdanov, Andrey Yu. Belonosov
Here, we analyzed geochemical indices of gases from core samples of permafrost table and evaluated data acquired from electric survey at the field of the Nadym-Pursk petroleum-bearing region. The Nadym-Pursk region is located in the northern West Siberia that is presently the major object of raw hydrocarbon (HC) exploration. The geologic exploration practice has demonstrated that the seismic survey
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A novel thermal stimulation approach for natural gas hydrate exploitation —— the application of the self-entry energy compensation device in the Shenhu sea J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-19 Hongyu Ye, Xuezhen Wu, Dayong Li, Yujing Jiang, Bin Gong
Thermal stimulation is a common measure used to improve the decomposition efficiency of natural gas hydrate. However, the conventional thermal stimulation methods require considerable investments in wellbore construction. According to the penetration mechanism of the torpedo anchor, the self-entry energy compensation device (ECD) is innovatively proposed to replace the existing wellbore platform. The
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Evolution of fracture permeability and its compressibility in proppant-supported shale J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-19 Jianhua Li, Bobo Li, Jun Lu, Shulei Duan, Zheng Gao
Hydraulic fracturing is one of the effective means to increase shale gas production, during which, proppant was widely used to support fractures to form stable seepage channels. Following which changes in permeability are restricted by the compaction and embedding of proppants, so studies on the impact of proppant on the fracture conductivity are highly desirable. In this paper, we discussed first
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Hydrogen in pipeline steels: Recent advances in characterization and embrittlement mitigation J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-19 Hanyu Li, Ranming Niu, Wei Li, Hongzhou Lu, Julie Cairney, Yi-Sheng Chen
Hydrogen is a carbon-free fuel that can facilitate the progress of achieving net-zero emission. The use of the existing natural gas pipelines for hydrogen transport is an essential strategy to reduce the investment required for hydrogen distribution. However, gas transmission pipelines are generally comprised of steels that are susceptible to hydrogen embrittlement (HE). The failure of steel pipes
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Visualization and quantitative statistics of experimental hydraulic fracture network based on optical scanning J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-19 Hanzhi Yang, Lei Wang, Chunhe Yang, Yintong Guo, Wuhao Guo, Zhenhui Bi, Guokai Zhao
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Evaluation of lost gas in the borehole drilling stage: Implication for the direct method of coalbed methane content determination J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-16 Youpai Wang, Jianhong Kang, Fubao Zhou, Liang Yuan, Zhejun Pan
The current direct method of coalbed methane (CBM) content determination may underestimate the CBM content due to the negligence of lost gas in the borehole drilling stage of coal sampling, thus causing inaccurate evaluation of CBM reserves. In this work, considering the gas flow in coal body around the borehole before the coal sample is drilled down and exposed to air, the advanced lost gas in the
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The effect of overconsolidation on the mechanical behaviours of hydrate-bearing silty sediments J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-11 Tingting Luo, Chenyi Zhang, Jinhan Xu, Shuning Zhang, Xiaodong Zhao, Yiming Zhu, B.N. Madhusudhan, Yongchen Song, Tao Han
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Synergistic effects of CO2 density and salinity on the wetting behavior of formation water on sandstone surfaces: Molecular dynamics simulation J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-14 Tao Yu, Qi Li, Xiaochun Li, Haixiang Hu, Yongsheng Tan, Liang Xu
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Integrated optimization design for horizontal well spacing and fracture stage placement in shale gas reservoir J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-11 Lian Wang, Yuedong Yao, Wenzhi Wang, Caspar Daniel Adenutsi, Guoxiang Zhao, Fengpeng Lai
Horizontal well drilling and hydraulic fracturing technologies play an essential role in improving gas recovery from shale reservoirs. However, they are expensive technologies and resource intensive production strategies. Optimization design of horizontal well spacing and fracture stage placement helps in striking a balance between gas production and economic benefits. However, previous researches
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A new approach to production data analysis of non-volumetric naturally fractured gas condensate reservoirs J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-08 Fatemeh Zaremoayedi, Mojtaba Ghaedi, Niloofar Kazemi
A significant amount of hydrocarbon exists in naturally fractured formations. Due to the limitations of classical reservoir evaluation methods, the ongoing researches have focused on the analysis of production data to describe reservoir dynamic. Among the existing methods, the flowing material balance (FMB) technique brings a straightforward and accurate method of reserve estimation. Often, the same
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Carbon-based nanocomposites: Distinguishing between deep-bed filtration and external filter cake by coupling core-scale mud-flow tests with computed tomography imaging J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-09 Hamid Heydarzadeh Darzi, Mahdieh Fouji, Reyhaneh Ghorbani Heidarabad, Hamed Aghaei, Seyed Hasan Hajiabadi, Pavel Bedrikovetsky, Hassan Mahani
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An improved straight-line method for permeability and porosity determination for tight reservoirs using pulse-decay measurements J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-09 Yue Wang, Zhiguo Tian, Steffen Nolte, Bernhard M. Krooss, Moran Wang
Accurate assessment of the formation rock permeability and porosity is crucial for geotechnical applications. For tight formation rocks, separate measurements of permeability and porosity result in high time costs and degraded accuracy. This contribution presents an improved straight-line method that allows simultaneous permeability and porosity determination in a single pulse-decay measurement. In
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Molecular dynamics simulation of the transport properties and condensation mechanism of carbon dioxide J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-06 Hengguang Cao, Xuewen Cao, Junwen Chen, Xiangyang Zhao, Gaoya Ding, Dan Guo, Yang Liu, Hao Li, Jiang Bian
The application of supersonic gas separation technology to remove carbon dioxide (CO2) from natural gas is an emerging concept; however, the microscopic mechanisms of CO2 condensation remain unknown. The accuracy of various CO2 flexible force field models is evaluated in this study, and the CO2 nucleation and growth processes are elucidated using molecular dynamics simulations. The results show that
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Stress solutions for short- and long-term wellbore stability analysis J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-06 Chao Liu, Yanhui Han, Dung T. Phan, Younane N. Abousleiman
Numerous models have been proposed to address the time-delayed wellbore collapses or untimely mud losses that have been widely reported in the field. There is still reluctance in applying them in real-time field operations due to their complex mathematical appearance. In this technical note, we address the effective stress solutions for short- and long-term wellbore stability analysis. We present the
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An evaluation of viscous deformation of chalk on wellbore stability J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-08 Mohammad Reza Hajiabadi, Armin Afrough, Hamidreza M. Nick
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Why coal permeability changes under unconstrained displacement boundary conditions: Considering damage effects J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-08 Xianzhen Cheng, Lianjun Chen, Hengjie Luan, Jicheng Zhang, Yujing Jiang
Permeability is an important indicator of coalbed methane production. Previous classical theoretical permeability models under unconstrained boundary conditions have difficulty matching experimental results. Consideration of the actual cleat geometry can explain the non-equilibrium evolution of permeability to some extent, but the matrix swelling strain ignores the impact of damage effects. In this
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Domain generalization using contrastive domain discrepancy optimization for interpretation-while-drilling J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-30 Ting Xu, Wenting Zhang, Jing Li, Haining Liu, Yu Kang, Wenjun Lv
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Study on the hydrate inhibition effect of nano-silica in drilling fluids J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-02 Yong He, Xuebing Zhou, Lingli Shi, Zhen Long, Jingsheng Lu, Deqing Liang
Preventing hydrate crystallization in drilling fluid is the key to ensure the safety of deep water drilling. In this work, hydrate inhibition effect of nano-silica in deep water drilling fluids was measured and compared with the typical hydrate inhibitors containing KCl-PVP and EG-PVP. The three phase equilibrium and the formation kinetics of CH4 hydrate in the drilling fluids were measured. The micro-morphological
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A new meshless method to solve the two-phase thermo-hydro-mechanical multi-physical field coupling problems in shale reservoirs J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-01 Weiyao Zhu, Zhen Chen, Kai Liu
The efficient development of shale reservoirs relies on multi-stage hydraulic fracturing technology in horizontal wells involving the difficulty of multi-scale flow for either gas or water phases, which is characterized by the changes in the stress and temperature fields. The original simulation methods are unable to accurately solve the multi-physics field-coupled problems under such complex mechanical
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A Mori-Tanaka scheme-based model for gas-water two-phase cracked rocks and its application J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-04 Pu Wang, Yi-an Cui, Xinpeng Pan, Lei Li, Jianxin Liu, Wanrong Li
Microporous structure and pore fluid are two important components of poroelastic rocks that influence the variation of rock modulus. Cracks are special microstructures that are more likely to be compressed during wave propagation than stiff pores, resulting in squirt flow. In addition, the distribution of different fluids, such as water and gas, may be characterized by patchy saturation and generate
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Numerical study on the condensation characteristics of natural gas in the throttle valve J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-30 Changjun Li, Caigong Zhang, Zhuoran Li, Wenlong Jia
Due to the cooling effect of natural gas throttling, spontaneous condensation will occur in the throttle valve, which may affect pipeline system efficiency. However, the condensation characteristics (such as nucleation rate and condensation rate) remain unclear, and the traditional method based on the isenthalpic hypothesis can hardly solve this non-equilibrium issue. Based on the geometry differences
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High-throughput sapphire reaction system: A new experimental apparatus to evaluate hydrate kinetic inhibitors with high efficiency J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-07-01 Xue Zou, Mucong Zi, Caifeng Yang, Kai Liu, Chen Zhao, Daoyi Chen
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Investigation of enhanced exploitation of natural gas hydrate and CO2 sequestration combined gradual heat stimulation with CO2 replacement in sediments J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-29 Shuanshi Fan, Wangyang Yu, Chi Yu, Yanhong Wang, Xuemei Lang, Shenglong Wang, Gang Li, Hong Huang
CO2 replacement is a promising technology that simultaneously produces methane and carbon dioxide sequestration. In this work, a novel gradual heat injection enhanced replacement method (GHIR) was proposed to improve the methane production from natural gas hydrate sedimentary layer. The effects of heat injection mode on methane recovery, energy efficiency and the optimal operating conditions of GHIR
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Phase behavior of methane in shale inorganic nanopores using Monte Carlo molecular simulation J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-30 Xiangdong Xing, Qihong Feng, Wei Zhang, Sen Wang
Since methane is an important component of shale gas, its confined phase behavior is significant to understand the essential mechanism leading to the fluid occurrence and hydrocarbons production. We studied the confinement impact of shale inorganic nanopores with pore sizes of 2–20 nm, for temperatures at phase equilibrium (120–190 K) and reservoir condition (325 K) using Monte Carlo molecular simulations
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Investigation on reactive flow through porous media by quadtree Lattice Boltzmann J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-25 Sadegh Mahmoudi, Shahab Ayatollahi, Saeid Jamshidi, Amir Raoof
In this study, in order to investigate the effect of the underlying pore-scale processes on continuum scale simulations of porous media dissolution, we improve the standard Lattice Boltzmann method using Quadtree grid refinement approach to simulate fluid flow and reactive transport through large domain sizes. Our results have shown considerable computational improvements up to 80% in simulation time
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An investigation of nonlinear flow behaviour along rough-walled fractures considering the effects of fractal dimensions and contact areas J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-26 Guowei Ma, Chunlei Ma, Yun Chen
This study focuses on the investigation of the nonlinear flow behaviour along rough-walled fractures with contact areas in the framework of the lattice Boltzmann method. The numerical results indicate that the fracture surface roughness controls both the advective aperture and the eddy aperture in the analysis of pressure, velocity, and vorticity fields. The eddy volume fraction increases from 28%
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Effects of coalification on nano-micron scale pore development: From bituminous to semi-anthracite J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-28 Bin Gao, Caifang Wu, Yu Song, Dan Zhou, Jiang Han, Xiuming Jiang, Xiaojie Fang, Guangjun Feng
Surface atom functionalization and the variation of aliphatic/aromatic structures within coal macromolecules are key factors to determine the pore structures within coalification. The characteristics of nano-micron scale pore structures were analyzed with the aid of coupled fluid intrusion and molecular probe technologies. Results indicate that the cleavage of long-chain aliphatic structures enhances
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Effects of void morphology on fracturing characteristics of porous rock through a finite-discrete element method J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-26 Yuexiang Lin, Chenghao Li, Jianjun Ma, Mingfeng Lei, Linchong Huang
A systematic approach for generating a stochastic void geometry with controllable shape features is proposed for more realistic numerical modelling of porous rock materials. The numerical model (a finite-discrete model) is established by integrating zero-thickness cohesive elements with finite solid elements, to trace the progressive fracturing and failure behaviours of porous rocks. A series of Brazil
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Numerical analysis on gas production from silty hydrate reservoirs in the South China sea by depressurizing: The effect of permeability reduction caused by pore compression J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-27 Yuhang Gu, Jiaxin Sun, Fanfan Qin, Fulong Ning, Yanlong Li, Xinxin Cao, Tianle Liu, Ren Wang, Guosheng Jiang
Natural Gas Hydrate (NGH) is widely discovered in silty sediments with a high compressibility in the South China Sea. The permeability reduction in these reservoirs during depressurization is inevitable. Here, we innovatively take the effect of permeability reduction into account to improve the accuracy of production forecast and suggest the optimal production pressures for two different typical reservoirs
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Hydraulic diffusivity estimations for US shale gas reservoirs with Gaussian method: Implications for pore-scale diffusion processes in underground repositories J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-24 Ruud Weijermars, Clement Afagwu
This paper first presents so-called unified Gaussian solutions for the spatial advance of diffusion transients triggered by a sudden change in pressure, molecular mass concentration and/or temperature. The mathematical description with a Gaussian solution for the pressure transient is similar to that for molecular diffusion and quantifies the diffusion of pressure into the reservoir space due to a
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Hydrogen embrittlement of high-strength API carbon steels in H2S and CO2 containing environments J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-22 Jiwon Jeon, Ramadan Ahmed, Rida Elgaddafi, Catalin Teodoriu
This study aims to understand the Sulfide Stress Cracking (SSC) resistance of API carbon steels exposed to wet sour environments containing CO2. A mini-pipe specimen was cut from API grade tubulars and placed in an SSC test cell to perform the investigation. The specimen was highly strained and internally pressurized while exposed to the corrosive environment for seven days. The partial pressure ratio
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Dynamics of coalbed methane emission from coal cores under various stress paths and its application in gas extraction in mining-disturbed coal seam J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-22 Ting Liu, Yang Zhao, Xiangguo Kong, Baiquan Lin, Quanle Zou
Uncontrolled and excessive gas emission may affect normal production and even result in serious disasters such as gas explosion and coal and gas outburst. To find out the essence of abnormal gas emission under mining induced stress, in this work, we conducted experiments on gas emitting from coal cores under mining-induced stress paths, and systematically discussed the controlling mechanism of stress
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A numerical investigation for the impacts of shale matrix heterogeneity on hydraulic fracturing with a two-dimensional particle assemblage simulation model J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-22 Fakai Dou, J.G. Wang
A shale gas reservoir has complex mineral components, bedding planes and micro-cracks, thus being of inherent heterogeneity and anisotropy. The roles of bedding planes in hydraulic fracturing performance have been deeply studied, but the effects of rock inherent heterogeneity induced by mineral components are not well understood. This paper establishes a two-dimensional particle assemblage model to
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Brittleness evaluation based on shale fracture morphology J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-23 Zhihong Zhao, Ziqing Liu, Cong Lu, Tao He, Malin Chen
Fracture morphology of shales represents the main feature related to their brittleness, and plays an important role in affecting the complexity of fracture network in shale reservoirs. However, no brittleness index model based on fracture morphology has been developed so far. In the present research, a detailed analysis on morphological characteristics of shale fractures under triaxial compression
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A novel implicit method of characteristics using pressure-referenced correction for transient flow in natural gas pipelines J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-15 Bonchan Koo
This paper presents a novel implicit method of characteristics (MOC) utilizing pressure-referenced characteristic line correction that ensures the efficiency and reliability of transient flow analyses for natural gas pipelines. The conventional implicit MOC utilizes an inertial multiplier that results in issues associated with numerical dispersion and convergence in fast transient flows. This increases
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Pore and permeability properties of reservoir sandstone under a uniaxial compression CT test J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-14 Cong Hu, Yonggang Jia, Zhibo Duan
For underground gas storage projects that use depleted gas reservoirs, cyclic gas injection will change the stress fields and cause rock deformation. In-depth knowledge of the stress-induced deformation of reservoir rocks is important for secure gas storage. In this study, we performed a uniaxial compression computed tomography (CT) test with a reservoir sandstone sample to investigate the influence
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Water-soluble polymers for high-temperature resistant hydraulic fracturing: A review J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-17 Juan Du, Jinming Liu, Liqiang Zhao, Pingli Liu, Xiang Chen, Qiang Wang, Mengyao Yu
Water-soluble polymers, as thickeners, are the vital component of high temperature-resistant fracturing fluids. With the expansion of oil and gas exploration and development to deep unconventional reservoirs, better performances for polymer-based fracturing fluids are required. According to the types of polymers, polymer-based fracturing fluids can be divided into biopolymers, synthetic polymers and
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Rock-Wettability Impact on CO2-Carbonate Rock Interaction and the Attendant Effects on CO2Storage in Carbonate Reservoirs J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-11 Ahmed Al-Yaseri, Nurudeen Yekeen, Hani Salman Al-Mukainah, Abhijit Kakati, Dheiaa Alfarge, Matt Myers
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A new permeability model of fracture containing proppants J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-11 Heng Li, Bingxiang Huang
Flow of fracture containing proppant widely exists in the reservoir stimulation. In this article, a typical channel fracture containing large-size proppant is focused, where the average size of proppant is near the aperture of fracture. The propped fracture has the characters of large porosity and small wetted area. In view of the fact that the traditional permeability models cannot be applied to the
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Experimental investigation on speed excursion of PIG due to friction variation in natural gas pipeline J. Nat. Gas Sci. Eng. (IF 5.285) Pub Date : 2022-06-04 Seungman Kim, Jongyeon Jeong, Kwanghyun Yoo, Huiryong Yoo, Yutaek Seo