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基于分子动力学方法的致密砂岩储层CO_(2)驱油研究进展

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天然气工业 2024年第4期44卷 146-159页

作者：余涛李琦谭永胜陈博文胡海翔岩土力学与工程国家重点实验室·中国科学院武汉岩土力学研究所中国科学院大学

随着致密砂岩储层CO_(2)-EOR项目的不断增加,亟需对CO_(2)与致密砂岩储层流体在孔隙介质中的相互作用机理进行研究,但室内实验难以观察到CO_(2)与流体在孔隙通道中的动态过程,而分子动力学模拟则可以弥补传统实验和数值方法的不足。为此... 详细信息

随着致密砂岩储层CO_(2)-EOR项目的不断增加,亟需对CO_(2)与致密砂岩储层流体在孔隙介质中的相互作用机理进行研究,但室内实验难以观察到CO_(2)与流体在孔隙通道中的动态过程,而分子动力学模拟则可以弥补传统实验和数值方法的不足。为此,围绕该方法在CO_(2)-EOR研究中的2大重点——界面行为与受限空间运移行为,对包括萃取、溶胀、降黏、降低界面张力、最小混相压力、润湿性等6个方面界面行为的相关研究成果进行了系统梳理,结合前人对CO_(2)与致密砂岩储层流体在受限空间中运移行为的研究成果,提出了分子动力学在致密砂岩储层CO_(2)-EOR研究中的关键科学问题。研究结果表明:①分子动力学能够很好地将CO_(2)萃取原油中—轻烃组分的过程进行可视化,建议根据原油实际组分构成分析CO_(2)的萃取能力,从而弄清CO_(2)萃取原油中各组分的优先顺序及效率;②有关CO_(2)分子对原油溶胀降黏作用的研究,大多数成果中的原油组分体系较为单一,建议根据实际储层的原油组分,系统探讨高温高压条件下CO_(2)的溶胀降黏作用;③对于CO_(2)与油水两相之间界面张力的研究更多是在体相中进行展开,而在纳米受限空间界面行为的研究还有待完善;④有关地层水在孔隙壁面的润湿性研究,对不同因素之间的协同效应影响润湿性的机理尚不明确。结论认为,随着量子力学研究的不断深入以及计算性能的日益强大,该方法可以在更大尺度上进行复杂体系的计算,以其为基础的油藏、页岩油气藏CO_(2)-EOR机理等研究将会取得较大的突破。

关键词：分子动力学 CO_(2)驱油致密砂岩储层溶胀降黏界面张力最小混相压力界面行为受限空间流动

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血管腔内介入治疗急性肺动脉栓塞58例临床分析

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中国基层医药 2024年第7期31卷 965-969页

作者：张伟谭永胜王梁石宝琪内蒙古自治区人民医院介入诊疗科呼和浩特010017

目的探讨下腔静脉滤器置入联合导管定向溶栓、抗凝治疗急性肺动脉栓塞合并下肢深静脉血栓的疗效及安全性。方法采用病例对照研究, 回顾性分析内蒙古自治区人民医院2021年8月至2023年8月确诊的急性肺栓塞患者58例的临床资料, 根据是否合... 详细信息

目的探讨下腔静脉滤器置入联合导管定向溶栓、抗凝治疗急性肺动脉栓塞合并下肢深静脉血栓的疗效及安全性。方法采用病例对照研究, 回顾性分析内蒙古自治区人民医院2021年8月至2023年8月确诊的急性肺栓塞患者58例的临床资料, 根据是否合并下肢深静脉血栓分为两组, 单纯肺动脉栓塞组(单纯组, n=14)行经定向导管溶栓联合低分子肝素抗凝治疗;肺动脉栓塞合并下肢深静脉血栓组(合并组, n=44)行下腔静脉滤器置入联合定向导管溶栓及低分子肝素抗凝治疗。观察两组肺循环术前、术后改善情况, 比较两组肺动脉置管溶栓前后动脉血氧分压、指尖氧饱和度、肺动脉主干血栓/肺动脉主干面积占比和呼吸频率等指标改善情况。结果患者手术均成功, 呼吸急促症状均明显缓解。术后, 单纯组呼吸频率、平均肺动脉压、动脉血氧分压、指尖氧饱和度分别为(22.75±4.38)次/min、(32.53±3.63)mmHg(1 mmHg=0.133 kPa)、(81.46±7.24)mmHg、(90.53±4.57)%, 合并组分别为(23.35±5.8)次/min、(31.34±4.53)mmHg、(82.34±4.62)mmHg、(92.57±3.45)%, 两组均高于术前(t=6.33、12.12、17.32、8.13, 6.86、13.02、15.52、7.20, 均P<0.001);单纯组肺动脉主干血栓/肺动脉主干面积占比为(19.56±7.53)%, 合并组为(20.63±4.83)%, 两组较术前均缩小(t=19.36、18.23, 均P<0.001)。结论经导管定向溶栓联合下腔静脉滤器置入的手术方法对急性肺动脉栓塞合并下肢深静脉血栓的治疗是有效的, 且安全性高。

关键词：肺栓塞肺动脉瓣下狭窄静脉血栓形成机械溶栓腔静脉滤器抗凝药治疗结果

Characterization of carbon dioxide leakage process along faults in the laboratory

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 674-688页

作者： Lifeng Xu Qi Li yongsheng tan Xiaochun Li State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

It is important to understand the process of multiphase carbon dioxide(CO_(2))leakage in faults for the risk assessment of carbon capture and storage(CCS).To quantitatively characterize the CO_(2)leakage process in the fault,pressure sensors,fiber Bragg grating(FBG)temperature and strain sensors were simultaneously used to monitor CO_(2)leakage in the *** experiments were carried out,including five groups of gaseous CO_(2)leakage tests with initial pressures of 1-5 MPa and five groups of liquid CO_(2)leakage tests with initial pressures of 6-10 *** results indicate that when liquid CO_(2)leaked with an initial pressure of 7-10 MPa,the pressure and temperature of CO_(2)dropped rapidly in the first few seconds and then remained *** behavior that CO_(2)continues to leak while maintaining temperature and pressure unchanged is defined as“temporary pseudo-sealing(TPS)”behavior,which continues for the first 1/3 of the leakage ***,this TPS behavior did not occur in gaseous CO_(2)*** only the pressure and temperature data were used to evaluate whether CO_(2)leakage occurred,we would misjudge the risk of leakage in CCS projects during the TPS *** causes and conditions of TPS behavior were further studied *** results show that:(1)TPS behavior is caused by the phase transition energy generated when liquid CO_(2)leaks.(2)The condition for TPS behavior is a small leak aperture(0.2 mm).Only a small leakage rate can make the phase transition energy and pressure change from a dynamic equilibrium,and(3)The compression zone caused by the Bernoulli effect and fault“barrier”could reduce the CO_(2)leakage rate and further promote the occurrence of TPS *** study provides technical and theoretical support for the quantitative characterization of the CO_(2)leakage process in faults of CCS projects.

关键词： Carbon dioxide(CO_(2))leakage Fault strain Temporary pseudo-sealing(TPS) Pressure front Fiber bragg grating(FBG)sensor Risk management

Dissolution and Deformation Characteristics of Limestones Containing Different Calcite and Dolomite Content Induced by CO_(2)-Water-Rock Interaction

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 956-971页

作者： CHEN Bowen LI Qi tan yongsheng Ishrat Hameed ALVI State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

To investigate the impacts of mineral composition on physical and mechanical properties of carbonate rocks,limestone specimens containing different contents in calcite and dolomite are selected to perform CO_(2)-water-rock reaction *** X-ray Diffraction(XRD) and Nuclear Magnetic Resonance(NMR) are carried out to examine the change characteristics of mineral dissolution and pore structure after *** core flooding experiments with Fiber Bragg gratings are implemented to examine the stress sensitivity of carbonate *** results show that the limestones containing pure calcite are more susceptible to acid dissolution compared to limestone containing impure *** calcite content in pure limestone decreases as the reaction *** dissolution of dolomite leads to the formation of calcite in impure *** dissolution leads to the formation of macropore and flow channels in pure limestone,while the effects of impure dolomite in impure limestone results in mesopore *** confining pressure is lower than 12 MPa,pure limestones demonstrate higher strain sensitivity coefficients compared to impure limestone containing dolomite after *** confining pressure exceeds 12 MPa,the strain sensitivity coefficients of both pure and impure limestones become almost equal.

关键词： CO_(2) geological storage carbonate rocks CO_(2)-water-rock interaction deformation response Fiber Bragg gratings sensors

Effect of H_(2)S content on relative permeability and capillary pressure characteristics of acid gas/brine/rock systems:A review

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第6期14卷 2003-2033页

作者： Xiaoyan Zhang Qi Li Mathias Simon Guodong Zheng yongsheng tan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Department of Engineering Durham UniversityDurhamDH13LEUK Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou730000China

Geological storage of acid gas has been identified as a promising approach to reduce atmospheric carbon dioxide(CO_(2)),hydrogen sulfide(H_(2)S)and alleviate public concern resulting from the sour gas production.A good understanding of the relative permeability and capillary pressure characteristics is crucial to predict the process of acid gas injection and *** prediction of injection and redistribution of acid gas is important to determine storage capacity,formation pressure,plume extent,shape,and leakage ***,the existing experimental data and theoretical models were reviewed to gain a better understanding of the issue how the H_(2)S content affects gas density,gas viscosity,interfacial tension,wettability,relative permeability and capillary pressure characteristics of acid gas/brine/rock *** densities and viscosities of the acid gas with different H_(2)S mole fractions are both temperature-and pressure-dependent,which vary among the gas,liquid and supercritical ***/acid gas interfacial tension decreases strongly with increasing H_(2)S *** mica and clean quartz,water contact angle increases with increasing H_(2)S mole *** particular,wettability reversal of mica to a H_(2)S-wet behavior occurs in the presence of dense H_(2)*** capillary pressure increases with decreasing contact *** a given saturation,the relative permeability of a fluid is higher when the fluid is *** capillary pressure decreases with decreasing interfacial tension at a given ***,the existing datasets do not show a consistent link between capillary number and relative *** capillary pressure decreases with increasing H_(2)S mole ***,there is no consensus on the effect of the H_(2)S content on the relative permeability *** may be due to the limited availability of the relative permeability and capillary pressure data for acid gas/brine/rock systems;thus,more experimental measure

关键词： Acid gas geological sequestration Relative permeability Capillary pressure H_(2)S content Wettability Interfacial tension

CO_(2) gas stripped off membranous residual oil from pore surfaces: Effects of temperature, pressure and wettability

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第12期15卷 3209-3220页

作者： Tao Yu Haixiang Hu Qi Li yongsheng tan Liang Xu Xiaomin Cao State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

The threshold values of CO_(2) gas stripped off membranous residual oil from the pore walls are not clear under different temperatures, pressures and wettability conditions. The extent to which temperature, pressure and wettability influence CO_(2) flooding for enhancing the recovery of residual oil in membranous formations also remains uncertain. Therefore, further quantitative characterization is entailed. In this study, the molecular dynamics method was employed to explore CO_(2) flooding under different temperatures, pressures and wettability conditions, aiming to enhance the production of membranous residual oil. The results reveal that the interaction energy between CO_(2), decane molecules and pore walls exhibits a decrease with increasing temperature and an increase with increasing pressure, respectively, in distinct wettability scenarios. When the temperature was at or below 363 K and the pressure was not lower than 40 MPa, CO_(2) gas could detach the membranous residual oil from the pore walls in the water-wet systems. When the temperature was equal to 363 K and the pressure remained under 40 MPa, or the temperature surpassed 363 K, CO_(2) gas failed to detach the membranous residual oil from the pore walls in the water-wet systems. For the mixed-wet and oil-wet systems, CO_(2) molecules could not detach the membranous residual oil from the pore walls. The hierarchy of influence regarding temperature, pressure and wettability on the competitive adsorption capacity of CO_(2) and decane molecules on the pore walls emerged as follows: wettability > temperature > pressure. The findings of this study offer valuable insights into the application of CO_(2) gas flooding for the exploitation of membranous residual oil on pore walls.

关键词： Molecular dynamics simulation CO_(2)flooding Wettability Interaction energy Residual oil CO_(2)utilization CO_(2)capture utilization and storage(CCUS)

Effects of rafting on the meso deformation and fracture behaviour of a Ni-based single crystal superalloy at room temperature: In-situ observation and simulation

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Science China(Technological Sciences) 2024年第7期67卷 2133-2146页

作者： tan Long YANG XiaoGuang SHI DuoQi FAN yongsheng SHI Yi School of Energy and Power Engineering Beihang UniversityBeijing 102206China Research Institute of Aero-Engine Beihang UniversityBeijing 102206China National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics Beihang UniversityBeijing 102206China School of Materials Science&Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Microstructural rafting of Ni-based single-crystal(SC) superalloys is inevitable at elevated temperatures during long-term service with mechanical loading, which significantly affects the mechanical behaviour of the material. In this study, the effects of rafting on the mesodeformation and fracture behaviour of a Ni-based SC superalloy under cyclic and tensile loads were investigated using in situ scanning electron microscopy(SEM), digital image correlation(DIC), and crystal plasticity finite element method(CP-FEM) simulations. The results indicated that the tensile strength decreased significantly in the rafted specimens. In the cyclic tests, both the virgin and rafted specimens showed an increase in the maximum shear strain with cycle number. The interaction of cross-slip bands was captured by in situ SEM-DIC around the micro-notch of the virgin specimens during the tensile test, while a more homogeneous local deformation field was observed in the rafting specimens. In addition,the fracture behaviour was strongly influenced by the rafting morphology. The crack exhibited instantaneous and long-range fracture features along the octahedral plane as it propagated in the rafting specimen, whereas it deflected over a short distance between the crystallographic planes at an early stage in the virgin specimen, which is consistent with the CP-FEM ***, the CP-FEM results for the crack initiation direction on(111) dominant slip plane were consistent with the in situ SEM observations.

关键词： in-situ SEM-DIC Ni-based SC superalloys microstructural rafting deformation crack path CP-FEM

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火电厂锅炉水冷壁焊缝泄漏失效分析

电焊机 2024年第4期54卷 84-90页

作者：校林飞杨占君郑准备张建伟周宁何华谭永生陈璟吴宇星大唐西北电力试验研究院陕西西安710021

某12Cr1MoV水冷壁对接焊缝中部出现周向裂纹导致泄漏失效,为调查泄漏失效原因,对焊缝进行了宏观检查、磁粉检测、硬度检验、金相分析、全元素分析和能谱分析,并建立模型分四个阶段讨论了水冷壁焊缝泄漏失效的原因。研究表明:焊缝中夹杂... 详细信息

某12Cr1MoV水冷壁对接焊缝中部出现周向裂纹导致泄漏失效,为调查泄漏失效原因,对焊缝进行了宏观检查、磁粉检测、硬度检验、金相分析、全元素分析和能谱分析,并建立模型分四个阶段讨论了水冷壁焊缝泄漏失效的原因。研究表明:焊缝中夹杂的S元素是焊缝泄漏失效的主要因素,收缩拉应力为偏析在晶界的低熔点共晶物提供了形成沿晶热裂纹的条件,氧气的介入造成热裂纹的局部氧化,实际运行的综合应力使氧化的沿晶热裂纹多点扩展、融合,形成宏观裂纹,最终导致焊缝泄漏失效。

关键词：水冷壁焊缝泄漏失效结晶裂纹元素偏析低熔点共晶物

气水同产井采气工艺在川西气田开发中的实践与认识

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钻采工艺 2005年第2期28卷 43-45页

作者：路芳谭永生中国石化西南分公司川西采输处

气田开发到一定的阶段产水量就会逐渐增大,对气井的生产造成严重的危害,甚至使气井水淹停产。为了避免气田因产水而导致产量大幅度递减的局面,川西气田在开发过程中,提出尽早采用排水采气工艺的治水措施,在气田开发实践中取得了良好的... 详细信息

气田开发到一定的阶段产水量就会逐渐增大,对气井的生产造成严重的危害,甚至使气井水淹停产。为了避免气田因产水而导致产量大幅度递减的局面,川西气田在开发过程中,提出尽早采用排水采气工艺的治水措施,在气田开发实践中取得了良好的经济效益,通过对川西气田开发现状、气田产水情况、气水同产井生产特征及生产中常采用的排水采气工艺的实例分析等几个方面研究。

关键词：气水同产井采气工艺川西气田