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Simulation study on cuttings transport of the backreaming operation for long horizontal section wells

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Petroleum Science 2024年第2期21卷 1149-1170页

作者： Yu-Fei chen Hui Zhang Wen-xin Wu Jun Li Yong Ouyang Zong-Yu Lu De-xin Ma Yong-chuan Wu Jun-Bo Liu Ke-Rou Liu Zhuo-xin Dong China University of Petroleum(Beijing) Beijing102249China Beijing Normal University at Zhuhai Experimental and Practical Education Innovation CenterZhuhai519087GuangdongChina Oil&Gas Technology Research Institute of PetroChina Changqing Oilfield Company Xi'an710016ShaanxiChina PetroChina xinjiang Oilfield Company Karamay834002XinjiangChina China Oilfield Services Ltd. Tianjin300459China

The backreaming operation plays a significant role in safe drilling for horizontal wellbores, while it may cause severe stuck pipe accidents. To lower the risk of the stuck pipe in backreaming operations, the mechanism of cuttings transport needs to be carefully investigated. In this research, a transient cuttings transport with multiple flow patterns model is developed to predict the evolution of cuttings transported in the annulus while backreaming. The established model can provide predictions of the distribution of cuttings bed along the wellbore considering the bulldozer effect caused by large-size drilling tools(LSDTs). The sensitivity analyses of the size of LSDTs, and backreaming operating parameters are conducted in Section 4. And a new theory is proposed to explain the mechanism of cuttings transport in the backreaming operation, in which both the bit and LSDTs have the “cleaning effect” and “plugging effect”.The results demonstrate that the cuttings bed in annuli is in a state of dynamic equilibrium, but the overall trend and the distribution pattern are obvious. First, larger diameters and longer drilling tools could lead to a higher risk of the stuck pipe. Second, we find that it is not the case that the higher flow rate is always better for hole cleaning, so three flow-rate intervals are discussed separately under the given conditions. When the “dangerous flow rate”(35 L/s in Case 4),the higher the flow rate, the better the cleaning effect of cuttings beds. Third, an interval of tripping velocity called “dangerous velocity” is proposed, in which the cuttings bed accumulation near the LSDTs is more serious than

关键词： Backreaming Stuck pipe Hole cleaning Transient solid transport Multiple flow patterns

考虑新能源发电不确定性的含微电网群共享储能优化调度

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电网技术 2024年第1期48卷 219-228页

作者：陈曦付文龙张海荣张赟宁王仁明李佳裕三峡大学电气与新能源学院湖北省宜昌市443002 梯级水电站运行与控制湖北省重点实验室(三峡大学) 湖北省宜昌市443002 中国长江电力股份有限公司湖北省宜昌市443133 智慧长江与水电科学湖北省重点实验室湖北省宜昌市443133

随着具有不确定性的可再生能源在微电网中渗透率日益提高,微电网新能源消纳所面临的挑战越来越大,而共享储能与微电网群的协同运行是提高其消纳能力的有效手段。为了解决不确定环境下微电网群与共享储能协同调度问题,提出了一种考虑新... 详细信息

随着具有不确定性的可再生能源在微电网中渗透率日益提高,微电网新能源消纳所面临的挑战越来越大,而共享储能与微电网群的协同运行是提高其消纳能力的有效手段。为了解决不确定环境下微电网群与共享储能协同调度问题,提出了一种考虑新能源发电不确定性的优化调度模型:首先,利用基于马尔科夫链蒙特卡洛算法的日状态转移过程集合生成方法,和基于条件生成对抗网络的日场景生成方法,生成周净发电功率典型场景。进而使用生成的典型场景作为运行模拟场景,以共享储能运营商为主体,以各微电网为从体,构建一主多从博弈优化调度模型,其中主体调整共享储能容量租赁价格以追求最大利润,从体响应租赁价格,调整租赁容量方案及运行计划以最小化自身用电成本。然后,设计了一种基于启发式算法的分布式迭代求解方法来求解所提模型。最后通过算例验证了所提模型的有效性。

关键词：共享储能微电网群新能源发电不确定性条件生成对抗网络主从博弈

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基于DIALux的飞机客舱照明设计方法

西北工业大学学报 2024年第1期42卷 53-61页

作者：付金池陈登凯张献谢凝西北工业大学工业设计研究所陕西西安710072 工业设计与人机工效工信部重点实验室陕西西安710072

飞机客舱照明是飞机内部照明系统的重要组成部分,合理的客舱照明设计可以提高飞行服务质量、提升旅客满意度和舒适度。基于DIALux计算仿真软件,提出了一种飞机客舱照明设计方法。从旅行安全、视觉舒适度、高品质服务等角度出发,通过对... 详细信息

飞机客舱照明是飞机内部照明系统的重要组成部分,合理的客舱照明设计可以提高飞行服务质量、提升旅客满意度和舒适度。基于DIALux计算仿真软件,提出了一种飞机客舱照明设计方法。从旅行安全、视觉舒适度、高品质服务等角度出发,通过对平均照度、眩光、照度均匀度等多方面的量化评估、校核与分析,探讨并提出了具有创新性的飞机客舱的照明设计方法。基于此方法以某型号飞机客舱为研究对象建立光学仿真模型、进行视觉仿真计算,验证了该方法的可行性。

关键词：照明设计视觉仿真飞机客舱设计方法 DIALux

Whole breast ultrafractionation radiotherapy after breast-conserving surgery in early breast cancer: A single-center, prospective, observational study from China

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Malignancy Spectrum 2024年第2期1卷 113-122页

作者： Rui-Zhi Zhao cheng Huang Tian-Lan Tang Gui-Qing Shi Si-Lin chen Yu-Ping Lin Ying Wang Liu-Qing Jiang Jin-Hua chen Chun-Sen Xu Fang-Meng fu Zhong-Hua Han Shun-Guo Lin chuan Wang Yong Yang Department of Radiation Oncology Fujian Medical University Union HospitalFujian Key Laboratory of Intelligent Imaging and Precision Radiotherapy for Tumors(Fujian Medical University)Clinical Research Center for Radiology and Radiotherapy of Fujian Province(DigestiveHematological and Breast Malignancies)FuzhouFujianChina Department of Follow-Up Center Fujian Medical University Union HospitalFuzhouFujianChina Department of Breast Surgery Fujian Medical University Union HospitalFuzhouFujianChina

Objective:This single-center,prospective,observational study was designed to investigate the toxicities,patient-reported outcome(PRO),and dosimetric analysis of whole breast ultrafractionation radiotherapy(RT)after breast-conserving surgery(BCS)in early breast cancer(BC).Patients and methods:Patients diagnosed with BC stage I,II and treated with BCS were enrolled.A dose of 26 Gray(Gy)in five fractions was prescribed to the whole breast and tumor *** endpoints included toxicities,PRO,and dosimetric *** was measured by the European Organization for Research and Treatment of Cancer general quality of life questionnaire(EORTC QLQ-C30)and the BC-specific questionnaire(EORTC QLQ-BR23)***:Between January 2022 and June 2023,62 female patients were *** median age was 45 *** patients(83.9%)were diagnosed with pathological stage I *** median planning target volume(PTV)was 456.4 *** minimum,maximum,and mean doses,and D95(dose of PTV irradiated volume more than 95%)to PTV were 20.2,28.8,27.2,and 26.3 Gy,*** median mean lung dose and percentage lung volume receiving 8 Gy(V8)were 3.6 Gy and 13.4%,*** median mean heart dose,V1.5(percentage of organ volume irradiated with 1.5 Gy or higher),and V7(percentage of organ volume irradiated with 7 Gy or higher)were 0.6 Gy,6.8%,and 0.4%,*** effects before RT showed no obvious differences compared to that post *** toxicities of grade 3 or higher *** patients had asymptomatic radiation pneumonia(grade 1),and 12 patients had radiation dermatitis(grade 1).No factor was significantly related to radiation dermatitis or radiation *** the EORTC QLQ-C30 and QLQ-BR23 questionnaires,all function and symptom scores before RT had no significant differences compared with that after RT,1−2 months after RT,and 3−4 months after *** RT did not worsen *** 1-year crude local control was 100%.Conclusion:Whole br

关键词： ultrafractionation radiotherapy breast cancer breast-conserving surgery toxicities patient-reported outcome

废冰箱回收利用环境效益评估——基于IMPACT WORLD+方法

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中国环境科学 2024年第9期44卷 5313-5320页

作者：黄银余茜黄瑶秦晋川陈梦君西南科技大学环境与资源学院固体废物处理与资源化教育部重点实验室四川绵阳621010

废电器是产生量大且增速快的一类固体废物.我国构建的废电器回收体系是实施碳达峰?碳中和的重要举措,但废电器回收利用体系的环境效益尚不清楚.利用IMPACTWORLD+方法,从不同环境影响类型出发评估废电器回收处理的环境效益,并通过损害类... 详细信息

废电器是产生量大且增速快的一类固体废物.我国构建的废电器回收体系是实施碳达峰?碳中和的重要举措,但废电器回收利用体系的环境效益尚不清楚.利用IMPACTWORLD+方法,从不同环境影响类型出发评估废电器回收处理的环境效益,并通过损害类型指标量化评价.结果表明,废冰箱回收利用的损害类型指标“人体健康”和“生态环境质量”的结果分别为-10592.501EUR2015和-8211.357EUR2015,合计为-18803.857EUR2015,即环境收益相当于18803.857EUR2015.据此估算,中国2021年废电器回收处理体系中仅废冰箱回收利用的环境收益可达12.82亿EUR2015.研究结果表明废电器回收处理的环境收益十分可观,有望为废电器回收行业的可持续发展提供新的助力.

关键词：废冰箱生命周期评价 IMPACT WORLD+ 环境效益环境收益

用于高压测量的MEMS硅-玻光纤FP压力传感器

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中国光学（中英文） 2024年第4期17卷 771-779页

作者：付雨薇王睿楠唐文婷杜喜昭王伟陈海滨西安工业大学光电工程学院陕西西安710021 西安外事学院工学院陕西西安710077

研究了一种基于微机电系统(MEMS)技术用于高压测量的硅-玻光纤法布里-珀罗(FP)压力传感器。该传感器以硅材料作为敏感元件,将电感耦合等离子体(ICP)干法刻蚀后的单晶硅膜片和高硼硅玻璃阳极键合构成FP腔。传感头使用MEMS技术批量制造,... 详细信息

研究了一种基于微机电系统(MEMS)技术用于高压测量的硅-玻光纤法布里-珀罗(FP)压力传感器。该传感器以硅材料作为敏感元件,将电感耦合等离子体(ICP)干法刻蚀后的单晶硅膜片和高硼硅玻璃阳极键合构成FP腔。传感头使用MEMS技术批量制造,结构稳定、抗过载能力强、在高压环境下不容易失效。实验结果表明,该传感器能够实现30 MPa的高压压力测量,灵敏度为46.94 nm/MPa,线性拟合度为0.99897,测量结果具有较好的一致性和可靠性,所设计的压力传感器在高压检测方面有很强的应用前景。

关键词： MEMS 光纤传感器压力测量 FP干涉

Synthesis of Dendritic-Linear Block Copolymers by Atom Transfer Radical Polymerization

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Chinese Chemical Letters 2001年第7期12卷 595-596页

作者： You Liang ZHAO Ai Jun GONG Jing JIANG Hong Wei LIU chuan fu chen fu xi State Key Laboratory of Polymer Physics and Chemistry Center of Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080

The dendritic polyarylether 2-bromoisobutyrate as the macromolecular initiator for the controlled free radical polymerization of styrene was investigated. The polymerization was carried out with CuBr/2,2 ' -bipyridine catalyst at 110 degreesC. It is found that the hybrid dendritic-linear block copolymers possess well-defined molecular weights and low polydispersities.

关键词： Atom transfer radical polymerization dendrimer polystyrene block copolymer

SYNTHESIS AND POLYMERIZATION OF TRI(2-PYRIDYL)METHYL METHACRYLATE

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Chinese Journal of Polymer Science 1999年第3期17卷 295-298页

作者： chuan-fu chen Yong-hong Yang fu xi Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China Chinese Acad Sci Inst Chem Beijing 100080 Peoples R China

A novel methacrylate monomer with bulky side group, tri(2-pyridyl)methyl methacrylate (Tr2PyMA), was synthesized and polymerized. The polymer obtained by radical polymerization exhibits high isotactic tacticity.

关键词： optical activity tri(2-pyridyl)methyl methacrylate

多尺度视角下广东臭氧时空分异特征及驱动因素

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中国环境科学 2024年第7期44卷 3601-3614页

作者：余锐步巧利陈辰麦博儒孙丽颖江铭诺邓若钊查进林符传博佛山市南海区气象局广东佛山528200 佛山市气象局广东佛山528300 中国气象局广州热带海洋气象研究所广东广州510640 广州市增城区气象局广东广州511300 广东省气象数据中心广东广州510640 广东省遂溪县气象局广东湛江524000 云南大学地球科学学院云南昆明650500 海南省气象科学研究所海南海口570203

鉴于近地面臭氧(O_(3))浓度具有多尺度和复杂非线性的时空变化特征,本研究基于2015~2022年广东地区O_(3)监测数据和同期气象资料,利用围绕中心点分割(PAM)聚类、Kolmogorov–Zurbenko(KZ)滤波和广义加性模型(GAM)等手段,探讨了不同区域... 详细信息

鉴于近地面臭氧(O_(3))浓度具有多尺度和复杂非线性的时空变化特征,本研究基于2015~2022年广东地区O_(3)监测数据和同期气象资料,利用围绕中心点分割(PAM)聚类、Kolmogorov–Zurbenko(KZ)滤波和广义加性模型(GAM)等手段,探讨了不同区域多时间尺度O_(3)浓度的变化特征及驱动因素.结果表明:广东地区近地面O_(3)存在跨行政区划的区域性特征,通过对O_(3)数据聚类分析可以划分出8个子区域;O_(3)浓度时间序列经尺度分离后,短期分量对总方差贡献最大,其次为季节分量;气象因子与O_(3)浓度变化的关系受到时间尺度和区域差异的影响;经气象调整后的O_(3)峰值浓度序列大多在2016年或者2017年后呈现下降的态势,珠三角地区是O_(3)污染的突出区域,由不利气象条件和人为排放共同引起;O_(3)浓度时间序列的长期分量大多呈现波动上升的趋势,人为排放虽然是O_(3)浓度的主要贡献,但气象条件才是驱动O_(3)浓度变化的主导因素.本研究结果进一步提示O_(3)污染防控工作需要因时因地制宜,建立基于气象状况变化的前体物减排预案对O_(3)污染防控具有重要意义.

关键词：臭氧多尺度气象调整聚类分析时空分异特征