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Adsorption and desorption characteristics of coal seam gas under infrared radiation 红外辐射下煤层气吸附与解吸特性研究
Q1 Physics and Astronomy Pub Date : 2023-09-11 DOI: 10.46690/capi.2023.09.02
Yuying Tu, Yongli Zhang, Yubin Dong, Yulin Ma
Infrared radiation technology can enhance rock permeability and promote methane desorption in coalbed methane thermal recovery. In this study, an experimental system with infrared radiation is developed to investigate the adsorption/desorption behavior of coal under different water contents. The results demonstrate that higher power levels of infrared radiation lead to decreased adsorption capacity and increased desorption capacity in coal. Specifically, employing 50 W infrared radiation results in a 30.9% increase in desorption capacity. Higher moisture content intensifies the desorption hysteresis effect, while this adverse impact can be mitigated by infrared radiation with greater power levels, exhibiting a stronger ability to reduce desorption-induced hysteresis. Additionally, a critical pressure for infrared radiation is established. Before and after this pressure, the influence of infrared radiation power on pressure sensitivity differs significantly. Finally, an improved Langmuir adsorption model considering infrared radiation power and moisture content is proposed and validated using experimental data. Our research expands the application of infrared radiation technology for enhanced coalbed methane recovery during actual mining operations. Document Type: Original article Cited as: Tu, Y., Zhang, Y., Dong, Y., Ma, Y. Adsorption and desorption characteristics of coal seam gas under infrared radiation. Capillarity, 2023, 8(3): 53-64. https://doi.org/10.46690/capi.2023.09.02
在煤层气热采中,红外辐射技术可以提高岩石渗透率,促进甲烷解吸。本文建立了红外辐射实验系统,研究了不同含水量下煤的吸附/解吸行为。结果表明,红外辐射功率越大,煤的吸附能力越低,解吸能力越强。具体来说,采用50 W的红外辐射可使解吸能力增加30.9%。较高的含水率加剧了解吸滞后效应,而红外辐射可以通过更高的功率水平来减轻这种不利影响,表现出更强的降低解吸滞后的能力。此外,还建立了红外辐射的临界压力。在此压力前后,红外辐射功率对压力灵敏度的影响有明显差异。最后,提出了一种考虑红外辐射功率和含水率的改进Langmuir吸附模型,并用实验数据进行了验证。本研究拓展了红外辐射技术在实际开采中提高煤层气采收率的应用。文献类型:原文引用号:涂颖,张颖,董颖,马颖。红外辐射下煤层气吸附与解吸特性研究。毛细管学,2023,8(3):53-64。https://doi.org/10.46690/capi.2023.09.02
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引用次数: 0
The impact of wettability and fluid saturations on multiphase representative elementary volume estimations of micro-porous media 润湿性和流体饱和度对微孔介质多相代表性基本体积估算的影响
Q1 Physics and Astronomy Pub Date : 2023-09-05 DOI: 10.46690/capi.2023.10.01
Shaheryar T. Hussain, Klaus Regenauer-Lieb, Aleksandr Zhuravljov, Furqan Hussain, Sheik S. Rahman
The occurrence of multi-phase flows in porous media is a complex phenomenon that involves multiple scales, ranging from individual pores to larger continuum scales. Upscaling frameworks have emerged as a response to the need for addressing the disparity between micro-scale processes and macroscopic modelling. Determination of the representative elementary volume is important for understanding fluid dynamics in micro-porous materials. The size of the representative elementary volume for multiphase flow in porous media is significantly affected by wettability and fluid saturations. Previous studies have overlooked this aspect by conducting simulations under conditions of constant medium wettability and fluid saturations. This study uses finite volume simulations with a volume of fluid approach for two distinct asymptotic homogenization methods, namely hydrodynamic bounds of relative permeability and thermodynamic bounds of entropy production. Strong wetting conditions with high wetting phase saturation were found to require a smaller sample size to establish representative elementary volume, while mixed-wettability scenarios necessitate the largest sample sizes. These findings improve our understanding of multiphase fluid flow behaviour in micro-porous materials and aid in enhancing techniques for scaling up observations and predictive modelling in engineering and environmental fields. Document Type: Short communication Cited as: Hussain, S. T., Regenauer-Lieb, K., Zhuravljov, A., Hussain, F., Rahman, S. S. The impact of wettability and fluid saturations on multiphase representative elementary volume estimations of micro-porous media. Capillarity, 2023, 9(1): 1-8. https://doi.org/10.46690/capi.2023.10.01
多孔介质中多相流的发生是一个复杂的现象,涉及多个尺度,从单个孔隙到更大的连续尺度。升级框架的出现是对解决微观尺度过程和宏观建模之间差异的需要的回应。确定具有代表性的基本体积对于理解微孔材料的流体动力学具有重要意义。多孔介质中多相流的代表性基本体积大小受润湿性和流体饱和度的显著影响。以往的研究通过在恒定介质润湿性和流体饱和度条件下进行模拟而忽略了这一点。本研究采用有限体积模拟和流体体积方法,对两种不同的渐近均匀化方法,即相对渗透率的流体动力边界和熵产的热力学边界进行了研究。高润湿相饱和度的强润湿条件需要较小的样本量来建立代表性的基本体积,而混合润湿情况需要最大的样本量。这些发现提高了我们对微孔材料中多相流体流动行为的理解,并有助于提高工程和环境领域中扩大观察和预测建模的技术。引用自:Hussain, S. T., Regenauer-Lieb, K., Zhuravljov, A., Hussain, F., Rahman, S. S.,微孔介质润湿性和流体饱和度对多相代表性基本体积估算的影响。毛细管学,2002,9(1):1-8。https://doi.org/10.46690/capi.2023.10.01
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引用次数: 0
Impact of capillary pressure on micro-fracture propagation pressure during hydraulic fracturing in shales: An analytical model 页岩水力压裂过程中毛管压力对微裂缝扩展压力影响的解析模型
Q1 Physics and Astronomy Pub Date : 2023-08-19 DOI: 10.46690/capi.2023.09.01
Yunhu Lu, Yan Jin, Hongda Li
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引用次数: 0
Recent research progress on imbibition system of nanoparticle-surfactant dispersions 纳米颗粒-表面活性剂分散体的渗吸体系研究进展
Q1 Physics and Astronomy Pub Date : 2023-08-04 DOI: 10.46690/capi.2023.08.02
Wenhao Shao, Jinzhou Yang, Haoyi Wang, Jia-Rong Chang, Hairong Wu, J. Hou
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引用次数: 2
Effect of TiO2–SiO2 hybrid nanofluids on enhanced oil recovery process under different wettability conditions 不同润湿性条件下TiO2-SiO2杂化纳米流体对提高采收率的影响
Q1 Physics and Astronomy Pub Date : 2023-06-25 DOI: 10.46690/capi.2023.07.01
A. Goharzadeh, Yap Yit Fatt, J. Sangwai
: The effect of TiO 2 –SiO 2 hybrid nanofluid on the enhanced oil recovery process is experimentally investigated. The flooding efficiency is measured for a flooding process in an initially oil-filled transparent micro-porous medium. Measurements were performed for two different surface wettability conditions, namely water-wet and neutral-wet. The average nanoparticle size, viscosity, surface tension, and contact angle of TiO 2 –SiO 2 hybrid nanofluid are reported. The flooding efficiency of the hybrid nanofluid is compared with that of SiO 2 nanofluid and TiO 2 nanofluid. The experimental results reveal that for neutral-wet surface condition, SiO 2 nanofluid achieves the best recovery, whereas for water-wet surface condition, TiO 2 –SiO 2 hybrid nanofluid produces the best flooding efficiency. Obtained results showed that TiO 2 nanofluid is unstable, with larger aggregated particles settling under gravity, and therefore not suitable for the flooding process by itself. The efficiency of hybrid nanofluid flooding depends significantly on fluid stability, wettability of the porous wall, surface tension, and contact angle of the three phases (crude oil, nanofluid solution, and solid surface). The TiO 2 –SiO 2 hybrid nanofluid reduces surface tension while increasing contact angle and solution stability.
实验研究了tio2 - sio2杂化纳米流体对提高采收率过程的影响。在初始充油的透明微孔介质中测量了驱油过程的驱油效率。测量了两种不同的表面润湿性条件,即水湿和中性湿。报道了tio2 - sio2杂化纳米流体的平均粒径、粘度、表面张力和接触角。将混合纳米流体的驱油效率与二氧化硅纳米流体和二氧化钛纳米流体进行了比较。实验结果表明,在中湿表面条件下,二氧化硅纳米流体的采收率最好,而在水湿表面条件下,二氧化钛-二氧化硅杂化纳米流体的驱油效率最好。结果表明,二氧化钛纳米流体不稳定,在重力作用下聚集颗粒较大,不适合单独驱油。混合纳米流体驱油的效率在很大程度上取决于流体的稳定性、孔壁的润湿性、表面张力和三相(原油、纳米流体溶液和固体表面)的接触角。二氧化钛-二氧化硅混合纳米流体降低了表面张力,同时增加了接触角和溶液稳定性。
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引用次数: 0
Stress sensitivity of multiscale pore structure of shale gas reservoir under fracturing fluid imbibition 压裂液渗吸作用下页岩气藏多尺度孔隙结构应力敏感性研究
Q1 Physics and Astronomy Pub Date : 2023-06-20 DOI: 10.46690/capi.2023.07.02
Mingjun Chen, Maoling Yan, Yili Kang, Wangkun Cao, Jiajia Bai, Peisong Li
: Generally, huge amounts of fracturing fluid are used in a shale gas well but the flowback efficiency is low. Since the distribution characteristics of imbibed fracturing fluid in shale are complex, they need further evaluation. This paper takes the Longmaxi Shale as the research object, including matrix cores, natural fracture cores and cores of artificial fracture with proppant. Stress sensitivity experiments are carried out on the above three kinds of cores under different degrees of imbibition and retention state of fracturing fluid. The results show that when the degree of aqueous phase retention is 0-0.78 pore volume
通常情况下,页岩气井需要使用大量压裂液,但返排效率较低。由于页岩中压裂液的分布特征复杂,需要进一步评价。本文以龙马溪页岩为研究对象,包括基质岩心、天然裂缝岩心和含支撑剂人工裂缝岩心。对上述三种岩心在压裂液不同程度的吸胀和滞留状态下进行了应力敏感性实验。结果表明:当水相保留度为0 ~ 0.78孔体积时
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引用次数: 1
Molecular insights into structural and dynamic properties of water molecules in calcium silicate hydrate nanopores: The roles of pore size and temperature 水分子在水合硅酸钙纳米孔中的结构和动态特性:孔径和温度的作用
Q1 Physics and Astronomy Pub Date : 2023-06-19 DOI: 10.46690/capi.2023.08.01
S. Liu, H. A, Shengwen Tang, M. Kai, Zhibing Yang
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引用次数: 0
Study on imbibition during the CO2 enhanced oil recovery in fractured tight sandstone reservoirs 裂缝性致密砂岩储层CO2增采过程中的渗吸研究
Q1 Physics and Astronomy Pub Date : 2023-06-14 DOI: 10.46690/capi.2023.06.02
Yuxia Wang, Qinghua Shang, Jingzhe Guo, Lifa Zhou
CO2 enhanced oil recovery (CO2-EOR) is a key technology for improving the oil recovery of fractured tight reservoirs, and imbibition has been recognized as an important mechanism for oil recovery in low-permeability reservoirs. To clarify the imbibition role and influencing factors during the CO2-EOR process in fractured tight oil reservoirs and also improve the EOR mechanism, a high-temperature and high-pressure CO2 imbibition experiment was performed based on the nuclear magnetic resonance technology. The results show that high pressure and high permeability are beneficial to imbibition efficiency. The salinity of the imbibition fluid is not very sensitive to the imbibition recovery. In addition, the CO2 increases the imbibition speed and can also significantly improve the production rate and oil recovery. It is beneficial to increase the CO2 concentration to shorten the imbibition equilibrium time and enhance oil recovery. According to the results of the nuclear magnetic resonance study, although the nanopore can provide a greater imbibition force, the oil flow resistance is also larger, but CO2 can reduce the flow resistance of oil and be conducive to oil production in smaller pores. The inclusion of imbibition into the research category of CO2-EOR mechanism will be more in line with field practice and more scientific in fractured tight reservoirs, thus providing theoretical support for the development and improvement of the CO2-EOR technology. Document Type: Original article Cited as: Wang, Y., Shang, Q., Guo, J., Zhou, L. Study on imbibition during the CO2 enhanced oil recovery in fractured tight sandstone reservoirs. Capillarity, 2023, 7(3): 47-56. https://doi.org/10.46690/capi.2023.06.02
CO2提高采收率(CO2- eor)是提高裂缝性致密储层采收率的关键技术,而渗吸是低渗透油藏采收率的重要机制。为明确裂缝性致密油储层CO2-EOR过程中的吸胀作用及其影响因素,完善EOR机理,开展了基于核磁共振技术的高温高压CO2吸胀实验。结果表明,高压、高渗有利于提高渗吸效率。吸胀液的矿化度对吸胀恢复不太敏感。此外,CO2增加了吸胀速度,也能显著提高产量和采收率。提高CO2浓度有利于缩短吸胀平衡时间,提高采收率。核磁共振研究结果显示,纳米孔虽然能提供更大的吸胀力,但油的流动阻力也更大,但CO2能降低油的流动阻力,有利于较小孔隙的采油。将渗吸纳入CO2-EOR机理的研究范畴,将更符合现场实际,也更科学地应用于裂缝性致密储层,为CO2-EOR技术的发展和完善提供理论支持。文献类型:引用本文:王勇,尚强,郭军,周磊。裂缝性致密砂岩储层CO2增强采油过程中的渗吸研究。毛细管学,2023,7(3):47-56。https://doi.org/10.46690/capi.2023.06.02
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引用次数: 1
Pore-scale fluid flow simulation coupling lattice Boltzmann method and pore network model 晶格玻尔兹曼方法与孔隙网络模型耦合的孔隙尺度流体流动模拟
Q1 Physics and Astronomy Pub Date : 2023-05-23 DOI: 10.46690/capi.2023.06.01
Jianlin Zhao, Yang Liu, Feifei Qin, L. Fei
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引用次数: 4
Analysis of wettability alteration in low salinity water flooding using a zeta potential-based model 基于zeta电位模型的低矿化度水驱润湿性变化分析
Q1 Physics and Astronomy Pub Date : 2023-05-17 DOI: 10.46690/capi.2023.05.02
Lawrence Opoku Boampong, R. Rafati, Amin Sharifi Haddad
: This study introduces a zeta potential-based model which connects low salinity water flooding oil recovery to the reservoir wettability. The model assumed that the reservoir wettability is controlled by the electrostatic forces that exist between rock-brine and oil-brine interfaces. Therefore, it links the wettability to the zeta potentials present at the corresponding interfaces. Using the model, various literature oil recovery data were simulated and then statistically compared the trend of the oil recovery factor with the trend of the wettability indicator values. The Pearson correlation coefficient was used for the statistical analysis. The results from the suggested model were compared with the outputs computed from other pre-existing models for wettability alteration. The simulation outcome indicated that a strong relationship exists between reservoir wettability and the zeta potentials produced at the rock-brine and oil-brine interfaces. The Pearson correlation coefficient calculated for the suggested model exceeded 0.7 for all the experimental cases simulated. However, most of the other pre-existing models showed weak relationships between the wettability indicator values and the oil recovery factor, with some models producing the Pearson correlation coefficient below 0.2. This study highlights the role of zeta potentials at the rock-brine and oil-brine interfaces on the wettability alteration during low salinity water flooding. The suggested model can be utilized in the decision making and implementation of low salinity water flooding works.
本文介绍了一种基于zeta电位的低矿化度水驱采油模型,该模型将低矿化度水驱采油与储层润湿性联系起来。该模型假设储层润湿性受岩石-盐水界面和油-盐水界面之间存在的静电力控制。因此,它将润湿性与相应界面上存在的ζ电位联系起来。利用该模型对各种文献采油数据进行了模拟,并将采油系数的变化趋势与润湿性指标值的变化趋势进行了统计比较。采用Pearson相关系数进行统计分析。将建议模型的结果与其他已有的润湿性变化模型的计算结果进行了比较。模拟结果表明,储层润湿性与岩石-盐水和油-盐水界面产生的zeta电位之间存在很强的关系。在所有模拟的实验案例中,为建议模型计算的Pearson相关系数都超过0.7。然而,大多数已有模型显示润湿性指标值与采收率因子之间的关系较弱,有些模型的Pearson相关系数低于0.2。本研究强调了低矿化度水驱过程中岩石-盐水和油-盐水界面zeta电位对润湿性变化的影响。该模型可用于低矿化度水驱工程的决策和实施。
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引用次数: 0
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Capillarity
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