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Highly rarefied gas flows in rough channels of finite length

Advances in Aerodynamics 2023年第1期5卷 558-578页

作者： zheng Shi Yulong Zhao Wei Su Lei wu Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055China State key laboratory of Oil and Gas Reservoir geology and Exploitation Southwest Petroleum UniversityChengdu 610500China Division of Emerging Interdisciplinary Areas The Hong Kong University of Science and TechnologyClear Water BayHong KongChina Department of Mathematics The Hong Kong University of Science and TechnologyClear Water BayHong KongChina

Highly rarefied gas flows through a rough channel of finite length with small bumps appended to its surfaces are investigated,by varying the accommodation coefficientin Maxwell’s diffuse-specular boundary condition,the characteristic size and position of the bumps,and the channel ***,we study the influence of the surface bumps and consider the rarefied gas flow in a unit channel with periodic boundary conditions to remove the end *** is found that the surface bumps have a significant impact on the flow ***is very small(i.e.,nearly specular reflection of gas molecules at the channel surface),the apparent gas permeability is dramatically reduced,even in the presence of small bumps,to a value that is almost comparable to the one when fully diffuse gas-surface scattering is *** impact can be taken into account through an effective accommodation coefficient,i.e.,the permeability of the rough channel is taken equivalently as that of a smooth channel without bumps but having gas-surface scattering under the effective accommodation ***,we study the end effect by connecting a smooth channel of length L_(0) to two huge gas *** is found that(i)the end correction length is large at small.Consequently,the mass flow rate barely reduces with increasing L_(0) rather than scales down by a factor of 1/L_(0) as predicted by the classical Knudsen diffusion theory;and(ii)the end correction is related to the channel’s aspect ***,based on the effective accommodation coefficient and end correction,we explain the exotic flow enhancement in graphene angstrom-scale channels observed by Geim’s research group(Keerthi et al,Nature 558:420-424,2018).

关键词： Rarefied gas Accommodation coefficient Rough channel End effect

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考虑虚拟边界与应力耦合的页岩渗透率模型

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大庆石油地质与开发 2024年第5期43卷 166-174页

作者：叶平平李波波吴学海宋浩晟段淑蕾成巧耘贵州大学矿业学院贵州贵阳550025 喀斯特地区优势矿产资源高效利用国家地方联合工程实验室贵州贵阳550025 贵州省非金属矿产资源综合利用重点实验室贵州贵阳550025

为探讨页岩气开采过程中页岩渗透率的变化情况,基于毛细管层序模型,采用虚拟边界与应力耦合相结合的方法,按照一定权重系数将应力推导黏性流动和克努森扩散相加,建立了页岩纳米孔体相气体传输模型。结果表明:新建渗透率模型计算曲线与... 详细信息

为探讨页岩气开采过程中页岩渗透率的变化情况,基于毛细管层序模型,采用虚拟边界与应力耦合相结合的方法,按照一定权重系数将应力推导黏性流动和克努森扩散相加,建立了页岩纳米孔体相气体传输模型。结果表明:新建渗透率模型计算曲线与试验实测值吻合较好,可以较好揭示页岩纳米孔体相气体流动情况;与Lu模型和S&D模型相比,新建模型考虑虚拟边界与应力的耦合,表观渗透率模型计算曲线与试验结果更为吻合,且能很好地反映实测值与孔隙压力所呈现的变化规律,具有较好的优越性;页岩力学参数(弹性模量、泊松比)、Langmuir应变常数及裂隙压缩系数对页岩渗透率起抑制作用,主要表现为其值越大,页岩渗透率越小;初始渗透率对页岩渗透率起促进作用,表现为其值越大,页岩渗透率越大。研究成果可为页岩气开发提供理论支撑。

关键词：页岩气开采渗透率虚拟边界层序模型应力/应变黏性流动克努森扩散

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复杂结构井旋转下套管数学模型建立与分析

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科学技术与工程 2024年第5期24卷 1870-1877页

作者：杨谋王鑫宇蒲欢李郑涛吴双胥猛生西南石油大学油气藏地质及开发工程全国重点实验室成都610500 中国石油西南油气田公司工程技术研究院成都618300 中国石油川渝页岩气前线指挥部成都610056 塔里木油田英买采油气管理区巴音郭楞841599

随着复杂结构井钻井技术发展,井斜角和方位角随着井深复杂变化引起常规套管下入方式难度大,旋转下套管技术可有效解决套管下入的难题,但该方面的理论模拟分析报道较少,增加了旋转下套管技术应用的盲目性和低效性。综合运用软杆和刚杆模... 详细信息

随着复杂结构井钻井技术发展,井斜角和方位角随着井深复杂变化引起常规套管下入方式难度大,旋转下套管技术可有效解决套管下入的难题,但该方面的理论模拟分析报道较少,增加了旋转下套管技术应用的盲目性和低效性。综合运用软杆和刚杆模型的优点并考虑井眼轨迹对模型计算条件影响,建立了旋转下套管数学模型;结合实例井对比了大钩载荷和模拟的轴向应力,验证了模型的正确性;在此基础上,探讨了常规和不同旋转速度下套管的摩阻,并分析了不同摩阻系数条件下的摩阻分布特征。实例分析表明:相同井深下,旋转下套管摩阻小于常规下套管摩阻,并且旋转速度越快,下套管摩阻越小;当旋转速度分别为15 r/min和20 r/min时,井底处摩阻降低幅度分别为12.13%和19.17%;造斜率越大,摩阻越高,导致套管下入到指定深度难度加大;钻井液摩阻系数越大,套管下入难度越高;在井深1 401.5 m,裸眼段摩阻系数分别为0.21和0.29,常规下套管摩阻分别为46.51 kN和57.49 kN。该模型能准确预测下套管摩阻,对复杂结构井的套管下入具有指导意义。

关键词：复杂结构井套管摩阻旋转下套管摩阻计算模型摩阻分布特征

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四川盆地德阳—安岳裂陷槽寒武系筇竹寺组超深层页岩气地质工程一体化高产井培育实践与勘探突破

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中国石油勘探 2024年第3期29卷 58-68页

作者：郑马嘉郭兴午伍亚赵文韬邓琪谢维扬欧志鹏中国石油西南油气田公司开发事业部中国石油西南油气田公司页岩气研究院中国石油西南油气田公司蜀南气矿

四川盆地德阳—安岳裂陷槽寒武系筇竹寺组超深层页岩储层地层时代老、埋藏深度大、热演化程度高,勘探开发难度大,国内外尚无可直接借鉴的经验。为此,基于地质工程一体化理念,探索建立筇竹寺组“部—钻—压—采”一体化高产井培育关键技... 详细信息

四川盆地德阳—安岳裂陷槽寒武系筇竹寺组超深层页岩储层地层时代老、埋藏深度大、热演化程度高,勘探开发难度大,国内外尚无可直接借鉴的经验。为此,基于地质工程一体化理念,探索建立筇竹寺组“部—钻—压—采”一体化高产井培育关键技术体系:(1)一体化井位部署,深化筇竹寺组“裂陷槽控藏”认识,明确优质储层分布模式,明确高产井实施技术界限,支撑井位优化部署;(2)一体化钻录定导,基于地质工程参数综合评价,优中选优确定靶体,优化井轨迹,强化地质钻井一体化精细管理,保障优质储层钻遇率;(3)一体化压裂增产,基于一体化压裂模型优化压裂设计,形成“促复杂+扩体积+强支撑+防套变”压裂工艺,有效实现裂缝均匀开启、高效扩展、全域支撑及储层改造体积最大化;(4)一体化精细返排,形成“四因子”返排增产技术,结合精细排采分析平台,实现降低储层伤害与气井增产“双突破”。基于上述技术体系,资201井首次在国内寒武系4500m以深的页岩储层测试获得高产工业气流,威页1H井成功实现高产井复制,初步落实埋深5000m以浅有利区面积近3000km^(2),资源量近2×10^(12)m^(3)。所形成的高产井培育技术和方法,为破解寒武系超深层页岩气规模效益开发难题奠定了坚实基础。

关键词：四川盆地寒武系筇竹寺组超深层页岩气地质工程一体化高产井培育

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Jurassic rocks,bivalves,and depositional environments of the source area of the Yangtze River,Qinghai Province,western china

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Science china Earth sciences 2011年第8期54卷 1136-1148页

作者： YAO HuaZhou ZHANG RenJie duan QiFa SHENG XianCai NIU ZhiJun WANG JianXiong ZENG BoFu wu JianHui wuhan Center of Geological Survey China Geological Survey Wuhan 430223 China State key laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Paleontology Chinese Academy of Sciences Nanjing 210008 China institute of Exploration and Development Jianghan Petroleum Administration Bureau Qianjiang 443124 China Hubei Vocational College of Land and resources Jingzhou 434000 China

Jurassic rocks are abundantly developed in the source area of the Yangtze River,South Qinghai,with the greatest thickness of 6311 m,including five stratigraphic units:Qoimaco Formation,Buqu Formation,Xiali Formation,Suowa Formation,and Xueshan *** on sufficient fossils of bivalves,ammonites,and brachiopods,the major part of these formations is ascribed to the Middle Jurassic Bathonian to *** diagnostic fossils have been found from the Lower Qoimaco Formation or Upper Xueshan Formation,which could possibly contain in part Bajocian and Oxfordian taxa respectively.

关键词： Source area of Yangtze River Jurassic rocks bivalves depositional environments

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地震多参数油气预测方法及应用研究

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沉积与特提斯地质 2002年第4期22卷 97-101页

作者：吴朝容李正文段文燊李显贵成都理工大学信息工程学院四川成都610059 中国石化新星西南分公司四川成都610081

地震多参数综合油气预测方法是一种基于地震数据计算储层段地震资料的富氏谱、功率谱、自相关、自回归和振幅等35种特征参数,并经广义线性分类,以实现油气异常圈定的方法技术。该方法的客观性较强,具有很高的可信度。经过碎屑岩储层、... 详细信息

地震多参数综合油气预测方法是一种基于地震数据计算储层段地震资料的富氏谱、功率谱、自相关、自回归和振幅等35种特征参数,并经广义线性分类,以实现油气异常圈定的方法技术。该方法的客观性较强,具有很高的可信度。经过碎屑岩储层、碳酸盐岩储层以及火山岩储层的预测和识别检验,具有较好的应用效果和广泛的市场价值,适应了油公司勘探开发的需要。

关键词：油气预测碎屑岩碳酸盐岩火山岩储层功率谱地震资料

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改性聚乙醇酸暂堵剂研发及其在河南油田的应用

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石油地质与工程 2024年第3期38卷 23-28页

作者：冯兴武刘正奎郑桐尹晓静杨琪段军中国石化河南油田分公司石油工程技术研究院河南南阳473000 河南省提高石油采收率重点实验室河南南阳473000

酸溶性暂堵剂对地层伤害较大,解堵较麻烦,油溶性暂堵剂不适合高含水的油层;河南油田低渗透油藏地层温度为50~120℃,注水驱油见水快,常规水溶性聚乙醇酸暂堵剂和聚乳酸暂堵剂水解温度大于80℃,不能完全满足低渗透油藏暂堵压裂的需求。结... 详细信息

酸溶性暂堵剂对地层伤害较大,解堵较麻烦,油溶性暂堵剂不适合高含水的油层;河南油田低渗透油藏地层温度为50~120℃,注水驱油见水快,常规水溶性聚乙醇酸暂堵剂和聚乳酸暂堵剂水解温度大于80℃,不能完全满足低渗透油藏暂堵压裂的需求。结合颗粒类水溶性聚乙醇酸暂堵剂和聚乳酸暂堵剂的特性和暂堵原理,采用催化剂和抑制剂使聚乙醇酸和聚乳酸发生酯化反应,生成聚乙醇酸和聚乳酸融合物,再加入成核剂及结晶促进剂,可得到改性聚乙醇酸暂堵剂。经测试,改性聚乙醇酸暂堵剂在50~120℃温度下具有常规聚乙醇酸暂堵剂的溶解性能和暂堵强度;当改性聚乙醇酸暂堵剂的总用量占比达到18%、粗粒径与细粒径质量配比接近1:1时,其封堵强度大于40 MPa,暂堵性能良好。现场试验7井次,加入改性聚乙醇酸暂堵剂后,单井施工压力最高增加了6.1 MPa,日增油5.3 t,取得了明显的增油效果。

关键词：暂堵剂转向压裂聚乙醇酸水溶性暂堵强度

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International experience of carbon neutrality and prospects of key technologies:Lessons for china

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petroleum Science 2023年第2期20卷 893-909页

作者： zheng-Meng Hou ying Xiong Jia-Shun Luo Yan-Li Fang Muhammad Haris Qian-Jun Chen Ye Yue Lin wu Qi-Chen Wang Liang-Chao Huang yi-Lin Guo Ya-Chen Xie institute of Subsurface Energy Systems Clausthal University of TechnologyClausthal-Zellerfeld38678Germany School of Earth and Space sciences Peking UniversityBeijing100871China State key laboratory of Oil and Gas Reservoir geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Sino-German Energy research Center Sichuan UniversityChengdu610065SichuanChina Department of petroleum&Gas Engineering University of Engineering&Technology54890LahorePakistan Yunnan key Lab.of Sino-German Blue Mining and Utilization of Special Underground Space Kunming650093YunnanChina Sino-German research institute of Carbon Neutralization and Green Development Zhengzhou UniversityZhengzhou450000HenanChina State key laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071HubeiChina

Carbon neutrality(or climate neutrality)has been a global consensus,and international experience exchange is *** the differences in the degree of social development,resource endowment and technological level,each country should build a carbon-neutral plan based on its national *** with other major developed countries(e.g.,Germany,the United States and Japan),china's carbon neutrality has much bigger challenges,including a heavy and time-pressured carbon reduction task and the current energy structure that is over-dependent on fossil *** we provide a comprehensive review of the status and prospects of the key technologies for low-carbon,near-zero carbon,and negative carbon *** innovations associated with coal,oil-gas and hydrogen industries and their future potential in reducing carbon emissions are particularly explained and *** on integrated analysis of international experience from the world's major developed countries,in-depth knowledge of the current and future technologies,and china's energy and ecological resources potential,five lessons for the implementation of china's carbon neutrality are proposed:(1)transformation of energy production pattern from a coal-dominated pattern to a diversified renewable energy pattern;(2)renewable power-to-X and large-scale underground energy storage;(3)integration of green hydrogen production,storage,transport and utilization;(4)construction of clean energy systems based on smart sector coupling(ENSYSCO);(5)improvement of ecosystem carbon sinks both in nationwide forest land and potential desert in Northwest *** paper provides an international perspective for a better understanding of the challenges and opportunities of carbon neutrality in china,and can serve as a theoretical foundation for medium-long term carbon neutral policy formulation.

关键词： International experience Carbon reduction technologies Carbon neutrality Energy transition Underground energy storage Carbon capture,utilization and storage(CCUS)

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Multiple-stacked Hybrid Plays of lacustrine source rock intervals：Case studies from lacustrine basins in china

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petroleum Science 2017年第3期14卷 459-483页

作者： Shu Jiang You-Liang Feng Lei Chen Yue wu zheng-Yu Xu zheng-Long Jiang Dong-Sheng Zhou Dong-Sheng Cai Elinda Mc Kenna Energy and Geoscience institute University of UtahSalt Lake City UT 84108 USA research institute of Unconventional Oil and Gas and Renewable Energy China University of Petroleum (East China) Qingdao 266580 Shandong China research institute of petroleum Exploration and Development PetroChina Beijing 100083 China School of Geoscience and Technology Southwest Petroleum University Chengdu 610500 Sichuan China Sinopec petroleum Exploration and Production research institute Beijing 100083 China Petrochina Hangzhou institute of geology Hangzhou 310023 Zhejiang China School of Ocean sciences China University of GeosciencesBeijing 100083 China CNOOC Beijing 100027 China

Hydrocarbon-producing lacustrine basins are widely developed in the world, and china has a large number of lacustrine basins that have developed since the early Permian. The organic-rich shale-dominated heterogeneous source rock intervals in chinese lacustrine basins generally contain frequent thin interbeds of stratigraphically associated sandstone, siltstone, marl, dolomite, and limestone. The concept of ‘‘Hybrid Plays＇＇ as put forth in this article recognizes this pattern of alternating organicrich shale and organic-lean interbeds and existence of mixed unconventional and conventional plays. Hybrid Plays in lacustrine source rock intervals present a unique closed petroleum system hosting continuous *** interbedded organic-lean siliciclastic and/or carbonateplays are efficiently charged with hydrocarbons via short migration pathways from the adjacent organic-rich shale that is often also a self-sourced play. We assert ‘‘Hybrid Plays＇＇ provide the most realistic exploration model for targeting multiple-stacked and genetically related very tight shale, tight and conventional plays together in the entire source rock interval rather than individual plays only. The Hybrid Play model has been proven and works for a wide variety of lacustrine rift, sag and foreland basins in china.

关键词： Lacustrine basin Hybrid Plays - Shale Interbed Source rock petroleum system

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Hydrogen isotope ratios of individual n-alkanes in plants from Gannan Gahai Lake(china) and surrounding area

Hydrogen isotope ratios of individual n-alkanes in plants fr...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： yi duan yingzhong wu Xixi Cao Yang Zhao Lanhua Ma key laboratory of petroleum resources research Gansu Province and Key Laboratory of Petroleum Resources ResearchInstitute of Geology and GeophysicsChinese Academy of Sciences University of chinese academy of Science Earthquake research institute of lanzhou SSB

Gannan Gahai Lake,in the northeast of the Tibetan Plateau,is the largest freshwater lake in the Gannan plateau,and is rarely influenced by human *** plants in the lake and terrestrial plants in the surrounding area were systematically collected,and the n-alkane distributions and hydrogen isotopic composition investigated for the first *** distributions exhibited a unimodal/bimodal distribution with maxima at Cor Cand at Cto C,and were dominated by odd numbered components with carbon preference index(CPI)values of *** chain length(ACL)values,ranging from 25.7to 29.6,correlated with the dominant n-alkane carbon *** average 5D values of the n-alkanes ranged from-246‰to-130‰.In general,the 5D values were higher for woody plants,lower for herbaceous plants and in between for aquatic *** data show that the hydrogen isotopic composition of the plant n-alkanes was influenced by species,leaf surface size,plant water source and ***5D values tended to be lower with increasing ACL values,which results from the reduction in leaf water *** isotopic fractionation during n-alkane synthesis was larger for herbaceous plants,smaller for woody plants and in between for aquatic plants.

关键词： Gannan Gahai Lake Plant n-Alkane Hydrogen isotope Influencing factor

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