Journal of Natural Gas Science and Engineering最新文献

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Methane foam performance evaluation in water-wet unconsolidated porous media: A systematic experimental investigation at elevated pressure and temperature conditions 水湿松散多孔介质中甲烷泡沫性能评价:高压和高温条件下的系统实验研究
IF 4.965 2区 工程技术
Journal of Natural Gas Science and Engineering Pub Date : 2022-12-01 DOI: 10.1016/j.jngse.2022.104835
Si Le Van , Magda Ibrahim Youssif , Alvinda Sri Hanamertani , Keerti Vardhan Sharma , Omar Elkhatib , Kaustubh Rane , Yun Xie , Alolika Das , Mohammad Piri , Amit Katiyar , Nagi Nagarajan
{"title":"Methane foam performance evaluation in water-wet unconsolidated porous media: A systematic experimental investigation at elevated pressure and temperature conditions","authors":"Si Le Van ,&nbsp;Magda Ibrahim Youssif ,&nbsp;Alvinda Sri Hanamertani ,&nbsp;Keerti Vardhan Sharma ,&nbsp;Omar Elkhatib ,&nbsp;Kaustubh Rane ,&nbsp;Yun Xie ,&nbsp;Alolika Das ,&nbsp;Mohammad Piri ,&nbsp;Amit Katiyar ,&nbsp;Nagi Nagarajan","doi":"10.1016/j.jngse.2022.104835","DOIUrl":"https://doi.org/10.1016/j.jngse.2022.104835","url":null,"abstract":"<div><p>In the petroleum industry<span>, enhanced oil recovery (EOR) techniques employ foam extensively to establish conformance control in heterogeneous and fractured reservoirs in order to increase the sweep efficiency. In such applications, foam performance evaluation under complex subsurface conditions is pivotal for the effective and optimized deployment of foam treatment. However, there is a scarcity of hydrocarbon gas foam generation and evaluation studies that examine the relationships between foam performance and the critical foam parameters at high-pressure and high-temperature conditions.</span></p><p><span>This study aims at methodically investigating the effects of several foam parameters on methane foam performance in water-wet proppant packs<span><span><span> under harsh operating conditions. This is in relation to the technical needs of hydrocarbon foam injection into hydraulically-induced, propped fractures in unconventional oil reservoirs. To this end, a state-of-the-art experimental foam generation apparatus was designed, fabricated, and commissioned. We performed a large number of foam flow experiments on proppant packs using methane gas and different foaming agents at 3500 psi and 115 °C. Anionic and amphoteric surfactants were employed to probe the effect of their ionic nature on foam performance. Foam performance sensitivities to various foam generation parameters and operating conditions, such as surfactant concentration, gas fraction, total </span>injection rate, operating pressure, </span>salinity<span><span>, and proppant pack length were investigated. To this end, steady-state pressure drops across the proppant packs during foam generation and foam's apparent viscosity were measured to quantify the foam performance of surfactants. The results were then analyzed to determine optimum values of the foam parameters and the </span>interplay between these parameters are discussed here. The systematic results achieved from this work are in agreement with the trends available in the literature and provide new insights into complexities of in situ foam generation in water-wet, unconsolidated </span></span></span>porous media at extreme reservoir conditions.</p></div>","PeriodicalId":372,"journal":{"name":"Journal of Natural Gas Science and Engineering","volume":"108 ","pages":"Article 104835"},"PeriodicalIF":4.965,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"3270823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
In situ SAXS study on the evolution of coal nanopore structures with uniaxial compressive stress 单轴压应力作用下煤纳米孔结构演化的原位SAXS研究
IF 4.965 2区 工程技术
Journal of Natural Gas Science and Engineering Pub Date : 2022-12-01 DOI: 10.1016/j.jngse.2022.104806
Yixin Zhao , Zhenyu Tai , Xiaodong Guo
{"title":"In situ SAXS study on the evolution of coal nanopore structures with uniaxial compressive stress","authors":"Yixin Zhao ,&nbsp;Zhenyu Tai ,&nbsp;Xiaodong Guo","doi":"10.1016/j.jngse.2022.104806","DOIUrl":"https://doi.org/10.1016/j.jngse.2022.104806","url":null,"abstract":"<div><p><span>In this study, an in situ synchrotron radiation<span><span> small-angle X-ray scattering (SAXS) experiment is used to characterize the evolution of coal nanopore structures under uniaxial compression. The variation in the coal nanopores is measured by analyzing the obtained scattering data. From the results, the coal scattering data show a positive Porod deviation in which the deviation slope decreases with increasing stress. Smaller nanopores are more sensitive to uniaxial </span>compressive stress. There is a positive correlation between scattering intensity </span></span><em>I</em> and stress at less than 30 nm. The scattering intensity <em>I</em><span> of pores larger than 30 nm is negatively correlated with uniaxial compressive stress. The structure of smaller pores is more complex. The surface fractal dimension </span><em>D</em><sub><em>S</em></sub> and pore fractal dimension <em>D</em><sub><em>P</em></sub> increases and decreases with increasing uniaxial compressive stress, respectively. The specific surface area is positively correlated with <em>D</em><sub><em>S</em></sub>. In the measuring range of 3–80 nm, the coal nanopores show a bimodal distribution. At the stage of below 0.6σ<sub>p</sub>, the average diameter decreases by 1.98%, the porosity and specific surface area increases by 6.21% and 31.5%, respectively; At the stage of above 0.6σ<sub>p</sub><span>, the average diameter decreases by 1.04%, the porosity and specific surface area increases by 1.18% and 5.57%, respectively. These results suggest that the variation of coal nanopores with stress have phased characteristics, and the evolution of the coal nanopores under uniaxial stress can be divided into two stages. In the nanopore fracture stage, the nanopores are deform, fracture and create new smaller pores with increasing stress, and the roughness of pore surface increase. In the nanopore closure stage, high stress intensifies the degree of pore fracture, and nanopores begin to close and disappear. This study reveals the evolution characteristics of the pore structures of coal under uniaxial compression at the nanoscale.</span></p></div>","PeriodicalId":372,"journal":{"name":"Journal of Natural Gas Science and Engineering","volume":"108 ","pages":"Article 104806"},"PeriodicalIF":4.965,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"3137329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Capillary trapping characteristics of CO2 sequestration in fractured carbonate rock and sandstone using MRI 裂缝性碳酸盐岩和砂岩中CO2封存的MRI毛细俘获特征
IF 4.965 2区 工程技术
Journal of Natural Gas Science and Engineering Pub Date : 2022-12-01 DOI: 10.1016/j.jngse.2022.104809
Ying Teng , Pengfei Wang , Heping Xie , Jianbo Zhu
{"title":"Capillary trapping characteristics of CO2 sequestration in fractured carbonate rock and sandstone using MRI","authors":"Ying Teng ,&nbsp;Pengfei Wang ,&nbsp;Heping Xie ,&nbsp;Jianbo Zhu","doi":"10.1016/j.jngse.2022.104809","DOIUrl":"https://doi.org/10.1016/j.jngse.2022.104809","url":null,"abstract":"<div><p>Capillary trapping is a prominent short-term trapping mechanism that achieves the maximum storage capacity and ensures the integrity of CO<sub>2</sub><span><span><span> sequestration in deep saline aquifers on an industrial scale. To maximize capillary trapping, fluid injection scenarios need to be investigated, and the fluid flowing characteristics in porous reservoir media need to be acknowledged. In this study, </span>magnetic resonance<span><span><span> imaging (MRI) technology was used to examine the distribution of three fluid pairs in fractured </span>carbonate rock and sandstone under reservoir conditions, and the </span>relative permeability<span> and capillary pressure<span> were determined based on their capillary end saturation profiles. The initial </span></span></span></span>gas saturation<span><span><span> increased with the injection rate<span>, and the fractured structure created a preferential flow channel that affected the </span></span>saturation distribution. Differences in interfacial tension and </span>wettability lead to different capillary pressures. The low interfacial tension of the scCO</span></span><sub>2</sub>/water fluid pair and its strong water-wet properties in sandstone caused high relative permeability and residual gas saturation. These results imply that the influence of the fluid injection method and reservoir properties on capillary trapping characteristics should be investigated in detail before implementing CO<sub>2</sub><span> geological sequestration.</span></p></div>","PeriodicalId":372,"journal":{"name":"Journal of Natural Gas Science and Engineering","volume":"108 ","pages":"Article 104809"},"PeriodicalIF":4.965,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"2631314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
A thermo-hydro-chemo-mechanical coupled model for natural gas hydrate-bearing sediments considering gravity effect 考虑重力效应的天然气水合物沉积热-水-化学-力学耦合模型
IF 4.965 2区 工程技术
Journal of Natural Gas Science and Engineering Pub Date : 2022-12-01 DOI: 10.1016/j.jngse.2022.104823
Zhigang Ye , Lujun Wang , Bin Zhu , Haibing Shao , Wenjie Xu , Yunmin Chen
{"title":"A thermo-hydro-chemo-mechanical coupled model for natural gas hydrate-bearing sediments considering gravity effect","authors":"Zhigang Ye ,&nbsp;Lujun Wang ,&nbsp;Bin Zhu ,&nbsp;Haibing Shao ,&nbsp;Wenjie Xu ,&nbsp;Yunmin Chen","doi":"10.1016/j.jngse.2022.104823","DOIUrl":"https://doi.org/10.1016/j.jngse.2022.104823","url":null,"abstract":"<div><p><span><span>Natural gas hydrates<span> have attracted many attentions recently as a promising energy, the exploitation of which will cause complicated multifield coupled behavior of hydrate-bearing sediments. As sediments usually vary from tens to hundreds of meters, the gravity effect on gas-liquid migration and soil deformation may not be completely ignored. This paper develops a new thermo-hydro-chemo-mechanical model to investigate the sediment behavior during the hydrate dissociation<span>. The equations of gas-liquid migration are numerical solved with explicit incorporation of hydrate dissociation process. The numerical stability and efficiency have been improved by expanding the Taylor series of the source terms and making the first-order approximation. Furtherly, pre-calculation procedures have been considered to obtain the initial state of field variables. Pilot-scale model results show that the gas-liquid migration, soil deformation and NGH dissociation are accelerated when the gravity effect is present. During the exploitation, a dissociation front can be observed, and gas-liquid migration and hydrate dissociation dominate the process alternatively, leading to first decrease and subsequent increase of </span></span></span>gas saturation and continuous rise of </span>liquid saturation<span>. Moreover, it is inferred that marginal enhancement of gas production can be achieved with the increase of wellbore lengths, but it should not exceed 75% of the reservoir thickness.</span></p></div>","PeriodicalId":372,"journal":{"name":"Journal of Natural Gas Science and Engineering","volume":"108 ","pages":"Article 104823"},"PeriodicalIF":4.965,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"3271725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research progress of the kinetics on natural gas hydrate replacement by CO2-containing mixed gas: A review 含二氧化碳混合气替代天然气水合物动力学研究进展
IF 4.965 2区 工程技术
Journal of Natural Gas Science and Engineering Pub Date : 2022-12-01 DOI: 10.1016/j.jngse.2022.104837
Xuemin Zhang , Shanling Zhang , Shaoqi Yin , Guanyu HE , Jinping Li , Qingbai Wu
{"title":"Research progress of the kinetics on natural gas hydrate replacement by CO2-containing mixed gas: A review","authors":"Xuemin Zhang ,&nbsp;Shanling Zhang ,&nbsp;Shaoqi Yin ,&nbsp;Guanyu HE ,&nbsp;Jinping Li ,&nbsp;Qingbai Wu","doi":"10.1016/j.jngse.2022.104837","DOIUrl":"https://doi.org/10.1016/j.jngse.2022.104837","url":null,"abstract":"<div><p>A clear understanding of the replacement characteristics and kinetic mechanism of CO<sub>2</sub>–CH<sub>4</sub><span> hydrate has great significance for natural gas hydrate (NGH) exploitation. This paper presents a comprehensive overview on the research progress of kinetics on CH</span><sub>4</sub> recovery from NGH by CO<sub>2</sub> replacement, especially with CO<sub>2</sub>-containing mixed gas. The promoting effect of small molecule gas such as H<sub>2</sub> and N<sub>2</sub> on the replacement process of CO<sub>2</sub>–CH<sub>4</sub> hydrate and its internal mechanism are deeply analyzed. Furthermore, based on the current conclusions obtained, the existing problems and future development directions of the CH<sub>4</sub> recovery from NGH by CO<sub>2</sub>-containing gas mixture are pointed out.</p></div>","PeriodicalId":372,"journal":{"name":"Journal of Natural Gas Science and Engineering","volume":"108 ","pages":"Article 104837"},"PeriodicalIF":4.965,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"3137327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Improved method and practice for site selection of underground gas storage under complex geological conditions 复杂地质条件下地下储气库选址的改进方法与实践
IF 4.965 2区 工程技术
Journal of Natural Gas Science and Engineering Pub Date : 2022-12-01 DOI: 10.1016/j.jngse.2022.104813
Wenpeng Guo , Bo Zhang , Yongtu Liang , Rui Qiu , Xuemei Wei , Pengtao Niu , Haoran Zhang , Zhuochao Li
{"title":"Improved method and practice for site selection of underground gas storage under complex geological conditions","authors":"Wenpeng Guo ,&nbsp;Bo Zhang ,&nbsp;Yongtu Liang ,&nbsp;Rui Qiu ,&nbsp;Xuemei Wei ,&nbsp;Pengtao Niu ,&nbsp;Haoran Zhang ,&nbsp;Zhuochao Li","doi":"10.1016/j.jngse.2022.104813","DOIUrl":"https://doi.org/10.1016/j.jngse.2022.104813","url":null,"abstract":"<div><p>Increasing attention has been paid to the site selection of Underground Gas Storage<span> (UGS) due to the growing demand for natural gas peak shaving. Existing studies have made a practical contribution to this field based on the multidimensional geological exploration<span> data and the multi-criteria decision-making method. However, previous studies mainly focused on screening or ranking technologies with different principles, which means only the attributes of UGS in the design period were considered while the performance in the operation period was ignored. The operation plan and economic performance are considerable concerns to the UGS investors especially when this type of storage facility was unbundling from other sectors in natural gas companies. To solve the UGS site selection problems more comprehensively and practically, the geological conditions and the injection &amp; extraction plan in the operation period are considered Simultaneously. A case from the S-X area in China indicates that: 1. The improved multi-period optimization model of the natural gas (NG) supply chain can obtain the injection and production plan of UGS which are the basic parameters for the economic analysis. 2. The top potential UGS estimated by geological conditions may take inferior performance in the operation stage (less peak shaving amount, low economic profits, and high freight of NG supply chain), so the UGS investors should consider the potential profits when the finished UGS is put into operation. The proposed framework can be a new theoretical guideline for the site selection problems of UGSs and can help UGS investors judge their investment.</span></span></p></div>","PeriodicalId":372,"journal":{"name":"Journal of Natural Gas Science and Engineering","volume":"108 ","pages":"Article 104813"},"PeriodicalIF":4.965,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"3453544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Machine learning for drilling applications: A review 钻井应用中的机器学习:综述
IF 4.965 2区 工程技术
Journal of Natural Gas Science and Engineering Pub Date : 2022-12-01 DOI: 10.1016/j.jngse.2022.104807
Ruizhi Zhong , Cyrus Salehi , Ray Johnson Jr
{"title":"Machine learning for drilling applications: A review","authors":"Ruizhi Zhong ,&nbsp;Cyrus Salehi ,&nbsp;Ray Johnson Jr","doi":"10.1016/j.jngse.2022.104807","DOIUrl":"https://doi.org/10.1016/j.jngse.2022.104807","url":null,"abstract":"<div><p>In the past several decades, machine learning has gained increasing interest in the oil and gas industry<span><span>. This paper presents a comprehensive review of machine learning studies for drilling applications in the following categories: (1) drilling fluids; (2) drilling hydraulics; (3) </span>drilling dynamics; (4) drilling problems; and (5) miscellaneous drilling applications. In each study, the machine learning algorithm(s), sample size, inputs and output(s), and performance are extracted. In addition, similarities of studies in each category are summarized and recommendations are made for future development.</span></p></div>","PeriodicalId":372,"journal":{"name":"Journal of Natural Gas Science and Engineering","volume":"108 ","pages":"Article 104807"},"PeriodicalIF":4.965,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"1696553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Experimental study on stress and permeability response with gas depletion in coal seams 煤层瓦斯枯竭时应力和渗透率响应的实验研究
IF 4.965 2区 工程技术
Journal of Natural Gas Science and Engineering Pub Date : 2022-12-01 DOI: 10.1016/j.jngse.2022.104824
Beichen Yu , Dongming Zhang , Kui Zhao , Bin Xu , Jiabo Geng , Chongyang Wang , Yu Chen
{"title":"Experimental study on stress and permeability response with gas depletion in coal seams","authors":"Beichen Yu ,&nbsp;Dongming Zhang ,&nbsp;Kui Zhao ,&nbsp;Bin Xu ,&nbsp;Jiabo Geng ,&nbsp;Chongyang Wang ,&nbsp;Yu Chen","doi":"10.1016/j.jngse.2022.104824","DOIUrl":"https://doi.org/10.1016/j.jngse.2022.104824","url":null,"abstract":"<div><p><span><span>The gas extraction environment in </span>coal seam<span><span> exhibits uniaxial strain condition with constant overlying strata stress and horizontal strain. Simulating this environment in laboratory often ignores true triaxial stress state, so the difference in horizontal stresses reduction and the accompanying permeability evolution remain ambiguous. Therefore, this study conducted the true triaxial stress and permeability response tests simulating gas extraction environment under shallow and deep in-situ stress conditions. To quantify </span>gas adsorption effect, the adsorbed (CO</span></span><sub>2</sub>) and non-adsorbed (He) gases were also used. The results indicated that the intermediate and minimum principal stresses, i.e., <em>σ</em><sub>2</sub> and <em>σ</em><sub>3</sub>, exhibited a linear decreasing trend during gas depletion, but showed more decreases in stress when the intermediate and minimum principal strains, i.e., <em>ε</em><sub>2</sub> and <em>ε</em><sub>3</sub><span>, recover under high gas pressure depletion. High true triaxial stress enhanced the compressibility of pores and fractures in coal, resulting in low horizontal deformation and stress reduction gradient during gas depletion. Similarly, the reduction gradient of </span><em>σ</em><sub>2</sub>, <em>m</em><sub><em>σ</em>2,</sub> was less than that of <em>σ</em><sub>3</sub><span>. This suggested that the difference between horizontal stresses also increased during coalbed methane (CBM) extraction, which exacerbated the risk of coal body damage. For different gas depletion, the stress reduction gradient exhibited </span><em>m</em><sub>He</sub> &lt; 1 and <em>m</em><sub>CO2</sub><span> &gt; 1, which was related to the relative affinity of different gas species for the adsorption medium. A significant matrix shrinkage effect resulted in a more pronounced stress reduction. For permeability, the permeability increased exponentially during CO</span><sub>2</sub><span><span> depletion, while the permeability of helium exhibited a decreasing followed by an increase with decreasing gas pressure. This is related to the competing mechanism and synergistic effect of the adsorptive gas desorption, effective stress effect, and </span>slippage effect<span>. We quantified the contribution and mechanism of the three to the permeability separately. The permeability anisotropy ratio (</span></span><em>A</em><sub>r</sub>) decreased exponentially during gas depletion.</p></div>","PeriodicalId":372,"journal":{"name":"Journal of Natural Gas Science and Engineering","volume":"108 ","pages":"Article 104824"},"PeriodicalIF":4.965,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"3271723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dual mechanisms of matrix shrinkage affecting permeability evolution and gas production in coal reservoirs: Theoretical analysis and numerical simulation 煤储层基质收缩影响渗透率演化和产气的双重机制:理论分析与数值模拟
IF 4.965 2区 工程技术
Journal of Natural Gas Science and Engineering Pub Date : 2022-12-01 DOI: 10.1016/j.jngse.2022.104844
Tiantian Zhao , Hao Xu , Dazhen Tang , Peng Zong
{"title":"Dual mechanisms of matrix shrinkage affecting permeability evolution and gas production in coal reservoirs: Theoretical analysis and numerical simulation","authors":"Tiantian Zhao ,&nbsp;Hao Xu ,&nbsp;Dazhen Tang ,&nbsp;Peng Zong","doi":"10.1016/j.jngse.2022.104844","DOIUrl":"https://doi.org/10.1016/j.jngse.2022.104844","url":null,"abstract":"<div><p><span>Matrix shrinkage is a factor that must be considered in the dynamic permeability model of coal reservoirs. The mechanism of matrix shrinkage affecting confining pressure (confining pressure mechanism) has been modeled by analogy with thermal expansion, and it is widely used in permeability model construction. However, the mechanism of matrix shrinkage affecting porosity (porosity mechanism) has not been widely recognized and modeled, and this mechanism independently controls porosity even though neither confining pressure nor </span>pore pressure<span> changes (only the replacement of different adsorbed gases occurs). The porosity mechanism and a permeability model that takes into account the dual mechanism have been modeled recently. This study compares the two mechanisms of matrix shrinkage by theoretical analysis of the mathematic relations in the permeability models considering different mechanisms and by finite element numerical simulations of coalbed methane<span> development considering different mechanisms. Theoretical analysis shows that the effect of the porosity mechanism on permeability is more than 1.5 times that of the confining pressure mechanism. the numerical simulations results show that: considering the porosity mechanism and the confining pressure mechanism simultaneously allows for a larger and earlier improvement in permeability and a larger reservoir area to improve, and a significant improvement of 28% in gas production rate occurs compared with the case only the confining pressure mechanism were considered. This study reveals the importance of porosity mechanism in describing the dynamic evolution of reservoir permeability and production dynamics accurately, and provides a scientific basis for coalbed methane development.</span></span></p></div>","PeriodicalId":372,"journal":{"name":"Journal of Natural Gas Science and Engineering","volume":"108 ","pages":"Article 104844"},"PeriodicalIF":4.965,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"1813507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hybrid artificial intelligence paradigms for modeling of water-gas (pure/mixture) interfacial tension 水-气(纯/混合)界面张力建模的混合人工智能范式
IF 4.965 2区 工程技术
Journal of Natural Gas Science and Engineering Pub Date : 2022-12-01 DOI: 10.1016/j.jngse.2022.104812
Mohammad Behnamnia , Abolfazl Dehghan Monfared , Mohammad Sarmadivaleh
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引用次数: 2
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