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Elastic fiber degradation in the development of pediatric granuloma annulare:Report of 39 cases
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作者 Dong-Yuan Zhang Li Zhang +4 位作者 Qin-Yan Yang Yu-Cheng Xie Hong-Chao Jiang Jia-Zheng Li Hong Shu 《World Journal of Clinical Cases》 SCIE 2023年第17期4019-4025,共7页
BACKGROUND Granuloma annulare(GA)has diverse clinical manifestations,multiple subtypes,and unknown etiology and pathogenesis.Existing studies regarding GA in children are scarce.AIM To examine the correlation between ... BACKGROUND Granuloma annulare(GA)has diverse clinical manifestations,multiple subtypes,and unknown etiology and pathogenesis.Existing studies regarding GA in children are scarce.AIM To examine the correlation between clinical manifestation and histopathology of pediatric GA.METHODS A total of 39 patients under 18 years of age with both a clinical and pathological diagnosis of GA at Kunming Children's Hospital from 2017 to 2022 were retrieved.Their medical records were consulted,and clinical data of the children were recorded and summarized,including gender,age,disease site,etc.Existing wax blocks of skin lesion specimens of children and pathological films were retrieved for further study and relevant histology,including hematoxylin-eosin,Alcian blue,elastic fiber(Victoria blue-Lichon red method),and antacid staining.Finally,the children’s clinical manifestations,histopathological results,and special staining characteristics were analyzed.RESULTS The clinical manifestations of granuloma annulare in children were diverse:11 cases presented with a single lesion,25 with multiple lesions,and 3 with generalized lesions.The pathological typing comprised histiocytic infiltration,palisading granuloma,epithelioid nodular,and mixed types in 4,11,9,and 15 cases,respectively.Thirty-nine cases were negative for antacid staining.The positive rate of Alcian blue staining was 92.3%,and that of elastic fiber staining was 100%.The degree of elastic fiber dissolution and granuloma annulare histopathological typing were positively correlated(r=0.432,P<0.05).No correlation was found between clinical presentation and histopathological typing of the granuloma annulare in children.In the pathological diagnosis of granuloma annulare,the positive elastic fiber staining rate was higher than that of Alcian blue staining.A correlation was found between elastic fiber dissolution degree and histopathological staging.However,the differences in pathological staging may have been related to the pathological manifestation of granuloma annulare at different periods.CONCLUSION Elastic fiber degradation may be a critical step in the pathogenesis of pediatric granuloma annulare.This is also one of the first studies focused on granuloma annulare in children. 展开更多
关键词 PEDIATRIC Granuloma annulare HISTOPATHOLOGY elastic fibers MUCIN Case report
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Lung cancer from a focal bulla into thin-walled adenocarcinoma with ground glass opacity—an observation for more than 10 years:A case report 被引量:2
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作者 Shu-Shi Meng Shao-Dong Wang +1 位作者 Yuan-Yuan Zhang Jun Wang 《World Journal of Clinical Cases》 SCIE 2020年第11期2312-2317,共6页
BACKGROUND Thin-walled lung cancer manifests as a cystic lesion,mostly adenocarcinoma.It is often misdiagnosed as a benign lesion in clinical practice,thus delaying the diagnosis and surgical treatment.Its natural cou... BACKGROUND Thin-walled lung cancer manifests as a cystic lesion,mostly adenocarcinoma.It is often misdiagnosed as a benign lesion in clinical practice,thus delaying the diagnosis and surgical treatment.Its natural course is rarely recorded and observed;thus,the pathogenesis and diagnosis need to be clarified and improved.CASE SUMMARY A 66-year-old man developed a mass in the upper lobe of the right lung and a small,thin-walled cavity in the lower lobe of the right lung in 2007.The right upper lobe mass was confirmed to be adenocarcinoma after surgery.The cavity diameter increased from 11 mm to 31 mm over 10 years,and a ground glass opacity lesion appeared around the bulla on computed tomography.A second operation confirmed that the lesion was lepidic predominant adenocarcinoma.Here we report a rare case of lung cancer developing from a focal bulla to a thinwalled adenocarcinoma for more than 10 years and confirm that the check-valve mechanism explains the pathogenesis.CONCLUSION Solitary thin-walled lung adenocarcinoma is a rare tumor in terms of its clinical manifestations,pathogenesis,and disease progression.The check-valve mechanism can explain the cause of thin-walled lung cancer.Close follow-up and accurate imaging are necessary. 展开更多
关键词 thin-walled lung cancer OBSERVATION The check-valve mechanism Case report
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Gastric ulcer treated using an elastic traction ring combined with clip: A case report 被引量:2
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作者 Fei Pang Yan-Jun Song +3 位作者 Yin-He Sikong Ai-Jun Zhang Xiu-Li Zuo Ru-Yuan Li 《World Journal of Clinical Cases》 SCIE 2022年第31期11574-11578,共5页
BACKGROUND There is a high annual incidence of acute,nonvariceal upper gastrointestinal bleeding in Chinese adults.Early endoscopic intervention can reduce rates of rebleeding,surgery,and mortality.The metal clip is t... BACKGROUND There is a high annual incidence of acute,nonvariceal upper gastrointestinal bleeding in Chinese adults.Early endoscopic intervention can reduce rates of rebleeding,surgery,and mortality.The metal clip is the most common method for establishing homeostasis;however,it possesses several limitations.In patients with bleeding secondary to large gastric ulcers,the clip will often fail to stop the bleeding.This article highlights the use of an elastic traction ring as a novel hemostatic method for patients with upper gastrointestinal bleeding.CASE SUMMARY An elderly male presented to the emergency room with complaints of hematemesis and melena.Endoscopic examination revealed an ulcer(Forrest IIa)in the lesser curvature of the gastric antrum.Six tissue clips and one elastic traction ring were inserted into the stomach cavity to suture the ulcer.The patient recovered quickly without postoperative gastrointestinal bleeding.Two months later,the patient's ulcer was significantly healed.CONCLUSION To our best knowledge,this is the first report to demonstrate the safety and efficacy of elastic traction rings for upper gastrointestinal bleeding.Elastic traction rings should be considered a routine therapeutic modality for patients with upper gastrointestinal bleeds. 展开更多
关键词 Gastric ulcer elastic traction ring Acute nonvariceal upper gastrointestinal bleeding Endoscopic hemostasia Tissue clips Case report
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Peroral endoscopic myotomy assisted with an elastic ring for achalasia with obvious submucosal fibrosis:A case report
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作者 Bai-Hui Wang Ru-Yuan Li 《World Journal of Clinical Cases》 SCIE 2022年第33期12257-12260,共4页
BACKGROUND Peroral endoscopic myotomy(POEM)is an established treatment option for esophageal achalasia.However,technical challenges and failures exist.Submucosal fibrosis is a rare cause of aborted POEM procedures.CAS... BACKGROUND Peroral endoscopic myotomy(POEM)is an established treatment option for esophageal achalasia.However,technical challenges and failures exist.Submucosal fibrosis is a rare cause of aborted POEM procedures.CASE SUMMARY We performed POEM with an elastic ring for achalasia with obvious submucosal fibrosis.The short-term outcome was excellent,surgery time was significantly shorter,and success rate was higher with POEM for achalasia with obvious submucosal fibrosis.CONCLUSION POEM performed with an elastic ring is a feasible and effective endoscopic treatment modality for achalasia with obvious submucosal fibrosis. 展开更多
关键词 Peroral endoscopic myotomy elastic ring ACHALASIA Submucosal fibrosis Case report
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INTRALUMINAL ELASTIC CIRCULAR LIGATION FOR ESOPHAGOGASTRIC ANASTOMOSIS(INCLUDING THE CLINICAL ANALYSES OF 100 CASES)
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作者 张毓德 杜喜群 +1 位作者 王其彰 张增强 《Chinese Journal of Cancer Research》 SCIE CAS CSCD 1989年第2期51-55,共5页
Between 1981 and 1988, 234 cases of cancerof the esophagus or gastric cardia were treatedby resection and intraluminal elastic circularligation for esophagogastric anastomosis. Thispresent study advances the results d... Between 1981 and 1988, 234 cases of cancerof the esophagus or gastric cardia were treatedby resection and intraluminal elastic circularligation for esophagogastric anastomosis. Thispresent study advances the results described inour earlier study. The details of technicalrefinements are here reported, based on the 展开更多
关键词 INTRALUMINAL elastic CIRCULAR LIGATION FOR ESOPHAGOGASTRIC ANASTOMOSIS INCLUDING THE CLINICAL ANALYSES OF 100 CASES
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航空弹性并车机匣模态分析与结构参数优化
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作者 吴安阳 宋朝省 +1 位作者 赵帅涛 邓自立 《重庆大学学报》 CAS CSCD 北大核心 2024年第9期39-50,共12页
针对某型航空并车机匣的模态共振问题,考虑航空机架弹性支承刚度,采用有限元法进行典型工况下约束模态分析,研究了并车薄壁机匣结构参数对约束模态固有频率的影响规律。结果表明优化支承位置是大幅度改变固有频率最有效的方式;当固有频... 针对某型航空并车机匣的模态共振问题,考虑航空机架弹性支承刚度,采用有限元法进行典型工况下约束模态分析,研究了并车薄壁机匣结构参数对约束模态固有频率的影响规律。结果表明优化支承位置是大幅度改变固有频率最有效的方式;当固有频率处在共振区间边缘时,可通过优化壁厚、筋板的方法小幅度调整。当2个支承位置位于机匣平面对称轴线时,固有频率最小且随支承距离减小而减小。随着薄壁厚度增大,1、3、5、6阶模态频率减小,2、4阶增大。1、3阶模态频率基本不受筋板参数的影响;2、4阶模态频率随筋板宽度、高度增大和宽高比减小而增大且4阶频率随筋板角度增大而增大;5、6阶模态频率随筋板角度增大、筋板宽度减小而增大。在此基础上,对弹性并车机匣的结构参数进行优化使固有频率避开共振区间,提高了机匣的抗振能力。 展开更多
关键词 弹性薄壁机匣 约束模态 固有频率 结构优化 减振设计
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注入井射孔段水泥环密封失效数值模拟研究
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作者 陈思成 张军 +1 位作者 马思佳 牟晋智 《化工机械》 CAS 2024年第2期252-259,共8页
基于流固耦合有限元数值模拟方法,模拟了不同注入压力、水泥环弹性模量和泊松比下水泥环密封失效范围。结果表明:高注入压力的卸载会引发水泥环界面的脱粘,使得泥岩层力学性能降低,增大注入井周围的剪切滑移量,加剧了注入井发生套变的可... 基于流固耦合有限元数值模拟方法,模拟了不同注入压力、水泥环弹性模量和泊松比下水泥环密封失效范围。结果表明:高注入压力的卸载会引发水泥环界面的脱粘,使得泥岩层力学性能降低,增大注入井周围的剪切滑移量,加剧了注入井发生套变的可能;水泥环弹性模量的减小,能够缩小水泥环界面失效的范围,同时增大注入压力宽裕度,提高了水泥环水力封隔能力;随着水泥环泊松比的增加,水压宽裕度逐渐增加,水泥环水力封隔能力逐渐增强,因此为防止发生窜槽,固井时应选取高泊松比的水泥环。 展开更多
关键词 注入井 水泥密封环 套变 有限元 弹性模量
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页岩油水平井上提下放过程中套管力学特征分析
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作者 赵朝阳 林铁军 +2 位作者 朱泽林 于浩 练章华 《石油管材与仪器》 2024年第3期33-38,I0004,共7页
为了提高页岩油水平井套管下入能力,上提下放技术已成为套管下放作业中必不可少的一环。然而,在多次上提下放过程中,井筒套管普遍出现断裂失效行为。以某口页岩油水平井实际套管下放作业为基础,结合弹塑性理论,采用有限元软件建立全井... 为了提高页岩油水平井套管下入能力,上提下放技术已成为套管下放作业中必不可少的一环。然而,在多次上提下放过程中,井筒套管普遍出现断裂失效行为。以某口页岩油水平井实际套管下放作业为基础,结合弹塑性理论,采用有限元软件建立全井段套管上提下放动力学模型,分别对单次以及多次作业过程中井筒套管轴向力、摩阻以及Mises应力分布状态开展研究。研究发现:在上提下放过程中,套管累积弹性能在上提阶段得到一定释放,在下放阶段重新累积;单次上提下放作业后,井筒套管Mises应力、下放摩阻及轴向力相较作业前明显下降,套管的下入能力得到一定提升;短时间内多次上提下放过程中,随着局部位置套管的弹性能快速累积释放,部分位置套管在摩阻作用下始终处于累积状态,最终导致局部套管屈曲行为进一步加剧。开展套管上提下放过程中的力学行为研究以及风险分析,可为页岩油水平井套管高效安全下入提供指导。 展开更多
关键词 页岩油水平井 套管下放 累积下放摩阻 上提下放 弹性能
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基于弹塑性模型的某舰炮抽壳力仿真计算
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作者 郝攀 张冰 梅帅 《机电产品开发与创新》 2024年第1期133-135,共3页
舰炮射击后药筒贴膛力对抽壳初速存在重要影响,贴膛过程药筒表现出弹塑性大变形特性,且沿口部至底部贴膛极不均匀,简化的二维模型及薄壁圆筒解析模型已经不能满足定量的分析需求。建立了基于弹塑性抽壳过程动力学仿真模型,采用Johnson-C... 舰炮射击后药筒贴膛力对抽壳初速存在重要影响,贴膛过程药筒表现出弹塑性大变形特性,且沿口部至底部贴膛极不均匀,简化的二维模型及薄壁圆筒解析模型已经不能满足定量的分析需求。建立了基于弹塑性抽壳过程动力学仿真模型,采用Johnson-Cook本构模型描述药筒弹塑性大变形行为,通过仿真计算获取药筒及炮膛动态应力应变、接触力及摩擦力等参量,分析了药筒动态贴膛规律及受力特性。仿真结果表明,舰炮射击过程药筒经历贴闩、径向自由膨胀至贴膛、贴膛后与炮膛协同变形及回弹至平衡态四个阶段,平衡状态后抽壳阻力不再变化,保持在13320N左右,抽筒子作用于药筒后抽壳初速最高达到18.9m/s,该抽壳初速满足了舰炮高速连发的设计性能要求。 展开更多
关键词 舰炮 贴膛 抽壳力 弹塑性模型
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A model of deformation of thin-wall surface parts during milling machining process 被引量:11
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作者 王凌云 黄红辉 +2 位作者 Rae W.WEST 李厚佳 杜继涛 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第5期1107-1115,共9页
A three-dimensional finite element model was established for the milling of thin-walled parts. The physical model of the milling of the part was established using the AdvantEdge FEM software as the platform. The alumi... A three-dimensional finite element model was established for the milling of thin-walled parts. The physical model of the milling of the part was established using the AdvantEdge FEM software as the platform. The aluminum alloy impeller was designated as the object to be processed and the boundary conditions which met the actual machining were set. Through the solution, the physical quantities such as the three-way cutting force, the tool temperature, and the tool stress were obtained, and the calculation of the elastic deformation of the thin-walled blade of the free-form surface at the contact points between the tool and the workpiece was realized. The elastic deformation law of the thin-walled blade was then predicted. The results show that the maximum deviation between the predicted value and the actual measured machining value of the elastic deformation was 26.055 μm; the minimum deviation was 2.011 μm, with the average deviation being 10.154 μm. This shows that the prediction is in close agreement with the actual result. 展开更多
关键词 thin-walled surface parts milling force elastic deformation finite element model
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Pressure performance for a thin-walled ring and turbulent-jet orifice modeled elastic squeeze film damper 被引量:1
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作者 Xiaomin YANG Haisheng YANG +3 位作者 Yongcun CUI Yan LI Bingzhen JIANG Sier DENG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第11期235-251,共17页
This paper explores an analytical model for Elastic Ring Squeeze Film Damper(ERSFD) with thin-walled ring and turbulent-jet orifices, and uncovers its Oil Film Pressure Performance(OFPP). Firstly, the ring deformation... This paper explores an analytical model for Elastic Ring Squeeze Film Damper(ERSFD) with thin-walled ring and turbulent-jet orifices, and uncovers its Oil Film Pressure Performance(OFPP). Firstly, the ring deformation is addressed by using the Fourier series expansion approach and the orifice outflow rate is characterized with the Prandtl boundary layer theory. Secondly, applying finite difference scheme, the influence of elastic ring flexibility, orifice diameter, and attitude angle on the OFPP is analyzed. Finally, Outer chamber pressure was measured experimentally at different rotor speeds. The results indicate that the outer chamber pressure coats an individual load-carrying region and spreads symmetrically pertaining to the attitude angle. Its amplitude drops as the elastic ring flexibility decreases but boosts with the reduction of the orifice diameter.For inner chamber pressure, the orifice diameter effects a similar trend to the outer cavity, but exhibits more stable distribution regarding the attitude angle. Minimizing the elastic ring flexibility causes an increase in amplitude. The model is validated by the test results giving that the outer chamber pressure shifts synchronously and periodically with the variation of the attitude angle,while the pressure amplitude increases slightly at higher rotor speeds. 展开更多
关键词 elastic ring squeeze film damper Orifice flow Rolling bearing thin-walled ring Turbulent jet Vibration
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Lung squamous cell carcinoma presenting as rare clustered cystic lesions:A case report and review of literature 被引量:1
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作者 Yu-Yao Shen Jing Jiang +1 位作者 Jing Zhao Jie Song 《World Journal of Clinical Cases》 SCIE 2022年第35期13006-13014,共9页
BACKGROUND Lung cancer is the leading cause of cancer-related death.Early diagnosis is critical to improving a patient’s chance of survival.However,lung cancer associated with cystic airspaces is often misdiagnosed o... BACKGROUND Lung cancer is the leading cause of cancer-related death.Early diagnosis is critical to improving a patient’s chance of survival.However,lung cancer associated with cystic airspaces is often misdiagnosed or underdiagnosed due to the absence of clinical symptoms,poor imaging specificity,and high risk of biopsy-related complications.CASE SUMMARY We report an unusual case of cancer in a 55-year-old man,in which the lesion evolved from a small solitary thin-walled cyst to lung squamous cell carcinoma(SCC)with metastases in both lungs.The SCC manifested as rare clustered cystic lesions,detected on chest computed tomography.There were air-fluid levels,compartments,and bronchial arteries in the cystic lesions.Additionally,there was no clear extrathoracic metastasis.After chemotherapy,the patient achieved a partial response,type I respiratory failure was relieved,and the lung lesions became a clustered thin-walled cyst.CONCLUSION Pulmonary cystic lesions require regular imaging follow-up.Lung SCC should be a diagnostic consideration in cases of thin-walled cysts as well as multiple clustered cystic lesions. 展开更多
关键词 Squamous cell carcinoma Lung cancer Cystic airspaces thin-walled cyst Computed tomography Case report
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Blade-Loss-Caused Rubbing Dynamic Characteristics of Rotor-Bladed Disk-Casing System
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作者 Zeng Jin Ma Hui +2 位作者 Ma Xinxing Wu Zhiyuan Qin Zhaoye 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2018年第1期116-125,共10页
Considering the elastic supports,the finite element model of rotor-bladed disk-casing system is established using commercial software ANSYS/LS-DYNA.Assuming that broken blade is released from the disk,the complicate r... Considering the elastic supports,the finite element model of rotor-bladed disk-casing system is established using commercial software ANSYS/LS-DYNA.Assuming that broken blade is released from the disk,the complicate rubbing responses of unbalanced rotor-bladed disk-casing system are studied under different operational speeds.In addition,influences of both plastic deformation of blade and casing failure are analyzed.The results show that there exist some multiple even fractional frequencies in the transient and steady vibration responses of unbalanced rotor.Besides,one nodal diameter vibration of bladed disk coupling with the lateral vibration of the shaft as well as the first order bending vibration of blade can be excited under low operational speed,while the first order bending vibration of blade coupling with the lateral vibration of disk-shaft is easily excited under high operational speed.During rubbing process,three distinct contact states can be observed:broken blade-casing contact,broken blade-blade component-casing contact and broken blade-casing contact/blade component-casing contact/blade selfcontact.It is worth noting that the third contact state is related to the operational speed.With the increase of operational speed,self-contact in the blade may occur. 展开更多
关键词 rotor-bladed disk-casing SYSTEM BLADE loss RUBBING casing failure elastic supports
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Effects of Carburized Parts on Residual Stresses of Thin-Rimmed Spur Gears with Symmetric Web Arrangements Due to Case-Carburizing
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作者 KouitsuMiyachika Wei-DongXue +2 位作者 SatoshiOda HidefumiMada HiroshigeFujio 《材料热处理学报》 EI CAS CSCD 北大核心 2004年第5期508-513,共6页
This paper presents a study on effects of carburized parts on residual stresses of thin-rimmed spur gears with symmetric web arrangements due to the case-carburizing. The carbon content of each element of the FEM gear... This paper presents a study on effects of carburized parts on residual stresses of thin-rimmed spur gears with symmetric web arrangements due to the case-carburizing. The carbon content of each element of the FEM gear model due to carburizing was obtained according to Vickers hardness Hv - carbon content C% and C% - d (distance from surface) charts. A heat conduction analysis and an elastic-plastic stress analysis during the case-carburizing process of thin-rimmed spur gears with symmetric web arrangements were carried out for various case-carburizing conditions by using the three-dimensional finite element method (3D-FEM) program developed by authors, and then residual stresses were obtained. The effects of the carburized part, the web structure, and the rim thickness on the residual stress were determined. 展开更多
关键词 表面渗碳 残留应力 薄边齿轮 3D-FEM 热传导
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船舶与海洋工程结构力学课程思政教学实践——以弹性支座化简为例
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作者 明付仁 李陈峰 +1 位作者 孙士丽 欧阳卫平 《高教学刊》 2023年第32期182-185,共4页
针对船舶与海洋工程专业力学课程的思政教学案例设计与实践,在黑龙江省教育厅关于课程思政高质量建设实施方案的指导下,该文介绍哈尔滨工程大学船舶与海洋工程结构力学教学团队在课程思政教学中的建设思路与方法。以一次示范课程弹性支... 针对船舶与海洋工程专业力学课程的思政教学案例设计与实践,在黑龙江省教育厅关于课程思政高质量建设实施方案的指导下,该文介绍哈尔滨工程大学船舶与海洋工程结构力学教学团队在课程思政教学中的建设思路与方法。以一次示范课程弹性支座化简为例,首先介绍“一依托、三根据、六结合”的课程思政元素挖掘与运用方法,然后以实际教学案例设计和实施过程,详细阐述了“导入—吸收—推广—内化”的四阶段教学过程,融合经典课程理论与时代思政案例,实现思政融入点与学生课堂情绪同频。最后,给出教学效果分析与教学反思,期待学习交流,提升专业知识教学与课程思政的协同育人水平。 展开更多
关键词 课程思政 船舶与海洋工程结构力学 弹性支座化简 教学案例 教学过程
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基于随机有限元法的圆形基础沉降最不利波动尺度分析 被引量:1
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作者 常鹏飞 李佳乐 +4 位作者 门飞跃 李亚军 李建光 李瑞杰 张彬 《水资源与水工程学报》 CSCD 北大核心 2023年第6期190-199,共10页
波动尺度(SOF)是表征土体空间变异性的重要参数,不同的波动尺度可以模拟土体参数的空间变异程度。基于随机有限元(RFEM)和蒙特卡罗模拟,假设弹性模量服从对数正态分布对土体实现非均质性建模,研究不同波动尺度下圆形基础的沉降变形规律... 波动尺度(SOF)是表征土体空间变异性的重要参数,不同的波动尺度可以模拟土体参数的空间变异程度。基于随机有限元(RFEM)和蒙特卡罗模拟,假设弹性模量服从对数正态分布对土体实现非均质性建模,研究不同波动尺度下圆形基础的沉降变形规律。研究结果表明:中心沉降值符合对数正态分布,差异沉降值符合正态分布;随着波动尺度的增加,中心沉降和差异沉降均值基本不变,中心沉降标准偏差先增大最后趋于平缓,差异沉降标准偏差先增大后减少,在其峰值处平均绝对差异沉降达到最大,此时的波动尺度为最不利波动尺度,在勘察数据相对有限的情况下可以对基础沉降概率进行保守估计。 展开更多
关键词 圆形基础沉降 最不利波动尺度 随机有限元 蒙特卡罗模拟 弹性模量 差异沉降
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超高强度套管TP165V开发及蠕变应力分析 被引量:2
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作者 张旭 李苏 +2 位作者 王恩越 朱钜鹏 安盛岳 《钢管》 CAS 2023年第2期9-15,共7页
针对蠕变地层用套管套损问题,设计开发一种新型超高强度套管,套管钢级达到165 ksi,横向冲击值不低于55 J,纵向冲击值不低于70 J,套管抗挤毁强度超过182 MPa。采用有限元方法分析套管受到的蠕变应力和弹性应力。试验表明套管极限抗挤毁... 针对蠕变地层用套管套损问题,设计开发一种新型超高强度套管,套管钢级达到165 ksi,横向冲击值不低于55 J,纵向冲击值不低于70 J,套管抗挤毁强度超过182 MPa。采用有限元方法分析套管受到的蠕变应力和弹性应力。试验表明套管极限抗挤毁强度超过200 MPa;以中原油田产层最大地应力约50 MPa为例,套管实际抗挤毁强度达到最大地层压力4倍。研究发现套管弹性应力和蠕变应力随着两向地应力差异增加而增加,且蠕变应力增加幅度高于弹性应力;当盐膏层被溶解产生孔洞后,胶结面处应力先增加后减小,最后趋于稳定。 展开更多
关键词 套管 超高强度 TP165V 蠕变应力 弹性应力 挤毁
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新时代背景下弹性力学课程的教学研究与实践 被引量:1
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作者 唐雪松 彭旭龙 陈央 《科教文汇》 2023年第21期75-77,共3页
根据新时代人才培养的新要求,结合普通高等院校工程力学专业弹性力学课程的特点,从教学内容优化、加强理论联系实际(工程案例)、引入课程思政、课程全过程考核等方面出发,开展课程教学研究与实践,持续改进教学效果,提高人才培养质量。
关键词 教学研究 弹性力学课程 课程思政 课程考核 工程案例
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文96储气库井油套环空压力预测新模型
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作者 熊万里 李遵照 +1 位作者 腰世哲 王佩弦 《当代化工》 CAS 2023年第10期2457-2461,共5页
受强注强采影响,文96储气库气井在周期性生产过程中油套环空带压现象越来越多。为保障储气库在冬季调峰过程中正常运行,减少对油套管的伤害,延长管柱使用年限,减少维护成本,综合考虑保护液体积受温度压力变化的影响以及压力、温度变化... 受强注强采影响,文96储气库气井在周期性生产过程中油套环空带压现象越来越多。为保障储气库在冬季调峰过程中正常运行,减少对油套管的伤害,延长管柱使用年限,减少维护成本,综合考虑保护液体积受温度压力变化的影响以及压力、温度变化对油管、套管管柱的影响,推导出考虑了生产管柱受温度变化影响的油套环空压力预测新模型,并对比分析了温度、压力变化对环空内压力的影响,对比了是否考虑套管受温度变化的环空内压力的差异,最后给出了油套环空的起压管控措施。计算结果表明,高温高压下生产套管受温度变化影响较大,环空压力变化值较大,温度变化对套管影响不可忽略。该模型对现场环空压力的预测,为现场采取措施治理环空压力提供了依据。 展开更多
关键词 储气库 环空压力 套管形变
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Distribution laws and effects analysis of casing external pressure taking elastic parameters matching into account 被引量:1
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作者 Hongkun Zhang Baojiang Sun +2 位作者 Guomin Yan ZhiyuanWang Mingzhao Huang 《Petroleum》 2016年第1期108-115,共8页
Distribution laws of casing external pressure,which are obtained by different scholars in different conditions,are not the same.Thus,a model to calculate the external pressure of casing is established with finite elem... Distribution laws of casing external pressure,which are obtained by different scholars in different conditions,are not the same.Thus,a model to calculate the external pressure of casing is established with finite element method.In the model a contact is built between the outer wall of the casing and the inner wall of the cement sheath.The casing external pressure can be got through extracting contact force of results.The numerical results and analysis show that:The largest casing external pressure exists in the direction of minimum horizontal stress of formation rather than in the direction of the maximum horizontal stress.There exists such matching between the cement sheath elastic modulus and formation elastic modulus:When the elastic modulus of the cement sheath is small,reducing its value is conducive to reduce the casing external pressure and to prolong casing service life.When the elastic modulus of the cement sheath is large,increasing its value is conducive to reduce the casing external pressure and to prolong casing service life.The casing external pressure will become large with the increase of Poisson's ratio of cement sheath.With the increase of the degree of the formation stress unevenness,the maximum casing external pressure increases and the smallest external decreases.The increasing of the non-uniformity degree of formation stress makes the non-uniformity degree of casing external pressure and the risk of casing failure increase.The study can provide certain reference for drilling workers to take measures to prolong service life of casing. 展开更多
关键词 External pressure casing failure Service life elastic modulus Poisson's ratio
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