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丙烷与二甲醚辅助SAGD开采规律二维物理模拟实验

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石油学报 2024年第6期45卷 999-1008页

作者：石兰香彭栋梁席长丰冯世博李松岩中国石油勘探开发研究院北京100083 中国石油大学(华东)石油工程学院山东青岛266580 中国石油大学(华东)非常规油气开发教育部重点实验室山东青岛266580

蒸汽辅助重力泄油技术(SAGD)是一种成熟的稠油热采技术,但其开采后期,随着蒸汽腔与盖层接触面积进一步增大,散热量增加,驱油效率降低,累计油汽比下降。在SAGD中、后期采用转轻烃溶剂辅助的接替技术,选择二甲醚作为辅助溶剂,并选取丙烷... 详细信息

蒸汽辅助重力泄油技术(SAGD)是一种成熟的稠油热采技术,但其开采后期,随着蒸汽腔与盖层接触面积进一步增大,散热量增加,驱油效率降低,累计油汽比下降。在SAGD中、后期采用转轻烃溶剂辅助的接替技术,选择二甲醚作为辅助溶剂,并选取丙烷作为对照,进行了3组二维可视化实验,全程监测产油和产液速率、产出液含水率、原油采收率、累计油汽比和溶剂回收率,并揭示了温度场和蒸汽腔的变化规律。实验结果表明,SAGD开采主要分为蒸汽腔向上发育、蒸汽腔横向扩展以及蒸汽腔向下发育3个阶段。蒸汽腔扩展到盖层边界,即达到SAGD开采中-后期,产油速率下降明显。在SAGD中-后期加入溶剂后,产油、产液速率均有明显上升。SAGD的采收率为53.67%,累计油汽比为0.141,相比之下丙烷辅助SAGD采收率提高了11.91%,累计油汽比提高了0.012;二甲醚辅助SAGD采收率提高了19.26%,累计油汽比提高了0.027。二甲醚的回收率为86.6%,比丙烷回收率高出6.9%。

关键词：二甲醚丙烷蒸汽辅助重力泄油技术二维模型物理模拟

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深层稠油油藏降黏泡沫驱驱油特征及机理研究

油气地质与采收率 2024年第2期31卷 128-137页

作者：党法强李松岩李明鹤何晓琳李兆敏中国石油大学(华东)石油工程学院山东青岛266580 非常规油气开发教育部重点实验室中国石油大学(华东) 山东青岛266580

降黏泡沫驱结合了降黏剂乳化降黏和泡沫选择性封堵的优势,可进一步提高开发后期深层稠油油藏的采收率。通过室内实验,根据降黏泡沫剂的降黏效果、起泡性能、泡沫稳定性,优选出合适的降黏泡沫剂浓度;通过单岩心驱替实验对比不同驱替方式... 详细信息

降黏泡沫驱结合了降黏剂乳化降黏和泡沫选择性封堵的优势,可进一步提高开发后期深层稠油油藏的采收率。通过室内实验,根据降黏泡沫剂的降黏效果、起泡性能、泡沫稳定性,优选出合适的降黏泡沫剂浓度;通过单岩心驱替实验对比不同驱替方式下降黏泡沫驱驱油特征以及开采效果,通过并联岩心实验研究不同渗透率级差下降黏泡沫的分流能力,明确降黏泡沫驱提高采收率机理。结果表明:降黏泡沫驱过程中,降黏剂可以促进稠油乳化降黏,泡沫可以有效封堵大孔喉,同时抑制氮气窜流。二者结合有效提高波及系数和洗油效率,提高驱替压差,降低含水率。降黏泡沫驱可以在降黏泡沫剂驱的基础上进一步提高13%的采收率。非均质条件下,降黏泡沫驱可以有效降低高渗透岩心窜流,迫使流体转向进入低渗透岩心发挥乳化降黏作用,扩大波及范围的同时提高了洗油效率。降黏泡沫驱技术能显著提高深层低渗透稠油油藏的采收率,其优化了油流分布,增强乳化与减少稠油黏度,为深层稠油高效开发提供了有效策略。

关键词：深层稠油油藏降黏剂驱泡沫驱降黏泡沫驱提高采收率

稠油油藏热溶剂辅助重力泄油开采机理及参数优化

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特种油气藏 2024年第1期31卷 74-80页

作者：李松岩程浩韩瑞魏耀辉李明鹤冯世博中国石油大学(华东)非常规油气开发教育部重点实验室山东青岛266580 中国石油大学(华东) 山东青岛266580 中海油田服务股份有限公司天津300459

针对稠油油藏开采过程中存在的热损失大、含水率高及开发效率低等问题,以加拿大Mackay River油藏为研究对象,建立了热溶剂辅助重力泄油技术的数值模拟模型,分别对SAGD、VAPEX和热溶剂辅助重力泄油开采特征进行对比,对热溶剂辅助重力泄... 详细信息

针对稠油油藏开采过程中存在的热损失大、含水率高及开发效率低等问题,以加拿大Mackay River油藏为研究对象,建立了热溶剂辅助重力泄油技术的数值模拟模型,分别对SAGD、VAPEX和热溶剂辅助重力泄油开采特征进行对比,对热溶剂辅助重力泄油开采技术的生产压力、注入速度和注入温度进行参数优化。研究结果表明:热溶剂辅助重力泄油技术在注采压差、采油速度和采收率方面优于SAGD与VAPEX技术;在实际开发过程中,热溶剂辅助重力泄油技术的最佳应用条件为:井底生产压力为700 kPa,注入速度为160 m^(3)/d,注入温度为275℃;三维实验结果进一步验证了数值模拟运算结果的可行性。该研究可为后续浅层稠油油藏的高效开发提供借鉴。

关键词：稠油开采重力泄油参数优化数值模拟提高采收率

Implications of Stahl's Theorems to Holomorphic Embedding Part I: Theoretical Convergence

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 761-772页

作者： songyan li Daniel Tylavsky Di Shi Zhiwei Wang School of Electrical Computer and Energy Engineering in Arizona State University TempeAZ 85287USA AINERGY LLC Santa ClaraCA 95051 State Grid Jiangsu Electric Power Company Nanjing 210024China

What is known as StahPs Theorem in power engineering circles is used to justify a convergence guarantee of the Holomorphic Embedding Method(HEM)as it applies to powerflow(PF)*** this two-part paper,we examine in more detail the implications of Stahl's theorems to both theoretical and numerical convergence for a wider range of problems to which these theorems are now being *** show that the difference between StahPs extremal domain and the function's domain is responsible for theoretical nonconvergence and that the fundamental cause of numerical nonconvergence is the magnitude of logarithmic capacity of the branch cut,a concept central to understanding *** introduce theorems using the necessary mathematical parlance and then translate the language to show its implications to convergence of nonlinear problems in general and specifically to the PF *** show that,among other possibilities,the existence of Chebotarev points,which are embedding specific,are a possible theoretical impediment to convergence・The theoretical foundation of Part I is necessary for understanding the numerical behavior of HEM discussed in Part II.

关键词： Analytic continuation holomorphic embedding method power flow Pade approximants HEM Stahl's theorems

Dynamic simulation and safety evaluation of high-speed trains meeting in open air

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Acta Mechanica Sinica 2016年第2期32卷 206-214页

作者： songyan li Zhijun Zheng Jilin Yu Chunqiang Qian CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China

Dynamic responses of a carriage under excitation with the German high-speed low-interference track spectrum together with the air pressure pulse generated as high-speed trains passing each other are investigated with a multi-body dynamics *** variations of degrees of freedom（DOFs：horizontal movement,roll angle,and yaw angle）,the lateral wheel-rail force,the derailment coefficient and the rate of wheel load reduction with time when two carriages meet in open air are obtained and compared with the results of a single train travelling at specifie *** show that the rate of wheel load reduction increases with the increase of train speed and meets some safety standard at a certain speed,but exceeding the value of the rate of wheel load reduction does not necessarily mean *** evaluation standard of the rate of wheel load reduction is somewhat conservative and may be *** pressure pulse has significan effects on the train DOFs,and the evaluations of these safety indexes are strongly suggested in *** pressure pulse has a limited effect on the derailment coefficien and the lateral wheel-rail force,and,thus,their further evaluations may be not necessary.

关键词： High-speed train Pressure pulse Derailment Dynamics simulation Safety standard

Asymmetrical Diffusion-Induced Directional Motion

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Communications in Theoretical Physics 2004年第5X期42卷 707-710页

作者： BAOJing-Dong WANGHai-Yan songyan-li TheKeyLaboratoryofBeamTechniqueandMaterialModificationoftheMinistryofEducation BeijingNormalUniversityBeijing100875China DepartmentofPhysics BeijingNormalUniversityBeijing100875China

Competition between anomalous diffusion and normal diffusion along two different directions of the track for a Brownian motor, combined with a periodic potential flashing, can lead to a macroscopic motion. The current is calculated analytically by using the Astumian-Bier's approach of the step number per cycle. It is shown that the direction of current occurs reversal for different waiting times of the potential off and the magnitude of current is prominently enhanced. Moreover, a thermal "green" noise is proposed to produce the ballistic diffusion, numerical simulations for the average velocity of the particle in the presence of ballistic and normal diffusions support the present theoretical findings.

关键词：不平衡波动不对称结构对称分布时间周期偏微分方程

明胶三维微球装载人脐带间充质干细胞修复慢性肌腱病

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中国组织工程研究 2025年第7期29卷 1356-1362页

作者：李帝均酒精卫刘海峰闫磊李松岩王斌山西医科大学第二医院骨科山西省太原市030000 浙江大学医学院附属第一医院骨科浙江省杭州市310006

背景:肌腱组织因缺少血管而修复困难,如何促进肌腱的恢复和提高肌腱损伤后干细胞治疗的效果,一直是临床及科研的研究热点和重点。目的:将人脐带间充质干细胞与明胶微载体支架结合构建组织工程化干细胞,通过体外实验与大鼠体内实验观察... 详细信息

背景:肌腱组织因缺少血管而修复困难,如何促进肌腱的恢复和提高肌腱损伤后干细胞治疗的效果,一直是临床及科研的研究热点和重点。目的:将人脐带间充质干细胞与明胶微载体支架结合构建组织工程化干细胞,通过体外实验与大鼠体内实验观察明胶微载体培养的人脐带间充质干细胞对肌腱病的治疗效果及作用机制。方法:(1)体外细胞实验:将人脐带间充质干细胞接种于三维明胶微载体后观察细胞活性以及存活情况,以常规培养的人脐带间充质干细胞作为对照;(2)动物体内实验:将成年SD大鼠随机分为正常组、肌腱病组、2D组(肌腱病+常规培养人脐带间充质干细胞)、3D组(肌腱病+明胶微载体三维培养的人脐带间充质干细胞),每组6只,治疗4周后进行动物行为学检测以及跟腱病理组织形态观察。结果与结论:(1)体外细胞实验:接种于明胶微载体的人脐带间充质干细胞存活率高,且随着时间延长细胞增殖速率增加;与对照组相比,三维明胶微载体培养的细胞活性更好;(2)动物体内实验:治疗4周后,与肌腱病组比较,3D组大鼠下肢功能恢复良好及组织病理学评分显著改善,而2D组也可一定程度改善肌腱病损伤,但效果不及3D组;(3)结果表明,三维明胶微载体培养的人脐带间充质干细胞可以促进肌腱损伤组织修复再生,且修复效果优于常规培养人脐带间充质干细胞。

关键词：肌腱病肌腱损伤人脐带间充质干细胞组织工程化干细胞微载体三维培养

Implications of Stahl's Theorems to Holomorphic Embedding Part II: Numerical Convergence

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 773-784页

作者： Abhinav Dronamraju songyan li Qirui li Yuting li Daniel Tylavsky Di Shi Zhiwei Wang School of Electrical Computer and Energy Engineering in Arizona State University TempeAZ 85287USA Southwest Electric Power Design Institute Co. Ltd.of China Siemens 8850 Fallbrook Dr.HoustonTexas 77064United States AINERGY LLC Santa ClaraCA 95051 State Grid Jiangsu Electric Power Company Nanjing 210024China

What has become known as Stahl's Theorem in power-engineering circles has been used to justify a convergence guarantee of the Holomorphic Embedding Method(HEM)as it applies to the power-flow *** this,the second part of a two-part paper,we examine implications to numerical convergence of the HEM and the numerical properties of a Pade approximant *** show that even if the point of interest is within the convergence domain,numerical convergence of the sequence of Pade approximants computed with finite precision is not *** propose a convergence factor equation that can be used to both estimate the convergence rate and the capacity of the branch *** also show that the study of convergence properties of the Pade approximant is the study of the location of the branch-points of the function,which in turn dictate branch-cut topology and capacity and,therefore,convergence rate.

关键词： Analytic continuation HEM holomorphic embedding method power flow Pade approximants StahPs theorems

Asymmetry of Coordinate and Velocity in Noisy Oscillator

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Communications in Theoretical Physics 2005年第1期43卷 97-101页

作者： songyan-li BAOJing-Dong WANGHai-Yan JIQing DepartmentofPhysics BeijingNormalUniversityBeijing100875China DepartmentofPhysics BeijingNormalUniversityBeijing100875China／／TheKeyLaboratoryofBeamTechniqueandMaterialModificationofMinistryofEducationBeijingNormalUniversityBeijing100875China DepartmentofPhysics HebeiUniversityofTechnologyTianjin300130China

The velocity variable of a noise oscillator as an internal or external noise is proposed, the spectrum of which is quite different from that of the coordinate variable of the same noise oscillator. The former leads to ballistic diffusion for a free particle in long time limit and the asymptotical results of the system are sensitive to the initial condition. However, diffusion process induced by the coordinate of noise oscillator is a normal one and depends on the initial condition only in the transient time. This allows us to classify two kinds of non-Markovian processes: normal one and strong one, just like the processes induced by the coordinate and the velocity of noise oscillator, *** to a correlation ratchet, we have found that the steady current of a particle subjected to the velocity of noise oscillator is opposite to that subjected to its coordinate, thus the former shows greenness and the latter redness.

关键词： velocity noise coordinate noise ballistic diffusion non-Markovian Langevinequation correlation ratchet