检索结果-南通市图书馆

Characterisation of Geomechanical Properties of Bentonite Clay Used for Plug and Abandonment Operations of Coal Seam Gas Wells

引用

Journal of Minerals and Materials Characterization and Engineering 2018年第2期6卷 218-234页

作者： Heinz-Gerd Holl Alexander Scheuermann School of Chemical Engineering University of Queensland Brisbane Australia School of Civil Engineering University of Queensland Brisbane Australia

Compressed bentonite in the form of pellets or plugs is used for the abandonment of production wells for the oil and gas industry. The design of the abandonment systems is based on the hydro-mechanical behaviour of the compressed bentonite defined by mechanical parameters that are used from published data rather than quantified for the used material by laboratory investigations. This paper presents an experimental study on characterising the swelling and shear strength behaviour of raw and polymer (polyvinylpyrrolidone, PVP) treated bentonite. dislodgement tests consist of three hydrated bentonite plugs inserted in steel casings with the failure mechanism characterised. The bentonite used comes from a local mine (in Queensland, Australia) and is comparable to other bentonites usually used for the abandonment of wells or for other problems where mineral sealing is required (e.g. basal clay barriers of landfills). The experiments have shown that polymer treated bentonite shows significantly larger shear strengths than raw bentonite with simultaneously less swelling. More compressed samples also showed higher shear strengths and less swelling. The dislodgement tests have characterised for the first time the cascaded failure mechanism of a series of plugs forming an abandonment system. This investigation is the first step towards the development of an improved design for abandonment systems for wells using bentonite plugs.

关键词： Bentonite Plugs Swelling Pressure Shear Testing Mechanical dislodgement

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Unique presentation of Twiddler's syndrome

引用

World Journal of Cardiology 2013年第6期5卷 207-209页

作者： Valay Parikh Emad A Barsoum Rewais Morcus Basem Azab James Lafferty Jeffrey Kohn Department of Medicine Staten Island University HospitalStaten IslandNY 10305United States Department of Surgery Staten Island University HospitalStaten IslandNY 10305United States Department of Cardiology Staten Island University HospitalStaten IslandNY 10305United States Department of Cardiology New York University Langone Medical CenterNew YorkNY 10016United States

We present a rare case of Twiddler's syndrome diagnosed in an asymptomatic patient on a routine follow *** case reiterates the need for frequent monitoring of the implanted *** addition,it was detected 4 years after i... 详细信息

关键词： Twiddler’s syndrome Defibrillator Complication Malfunction Lead dislodgement

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Unreported complication of Bravo p H capsule dislodged into the pyriform sinus

引用

World Journal of Gastrointestinal Endoscopy 2015年第5期7卷 573-574页

作者： Akash Kumar Elisabeth Kramer Sita Chokhavatia Department of Medicine the Mount Sinai Medical Center Division of Gastroenterology and Nutrition Memorial Sloan-Kettering Cancer Center Division of Gastroenterology and Hepatology Robert Wood Johnson University Hospital

We report an unexpected, previously unreported complication of Bravo p H capsule dislodgement. During Bravo p H testing of a 44-year-old man with gastroesophageal reflux disease, we were unable to endoscopically visualize the capsule attached to the esophageal wall after deployment. After multiple attempts to detect the capsule, it was visualized in the left pyriform sinus. As there was significant risk for pulmonary dislodgement, ENT and pulmonary physicians were immediately consulted to review options for safe removal. Ultimately, ENT successfully retrieved the capsule with a foreign body removal forceps. The Bravo p H test is generally a well-tolerated diagnostic tool used to confirm the presence of abnormal esophageal acid reflux. While few complications have been reported, technical difficulties can occur, including poor data reception, misplacement, and early dislodgement. Rarely, more serious complications can occur, ranging from esophageal wall trauma to capsule aspiration. Gastroenterologists performing this procedure should be aware of the low, but nontrivial, risk of complications.

关键词： Gastroesophageal reflux disease EsophagealpH monitoring Bravo capsule dislodgement Esophagogastroduodenoscopy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：