机电液一体化集土式扩底钻机具的研制与试验          下载免费PDF全文

冯美贵  翁炜  蒋睿 《探矿工程》2019,46(6):53-58

针对机械式扩底钻具存在扩孔与取土、清孔分离,工序复杂,孔内沉渣难以清理干净,施工效率低,扩孔质量、精度无法保证等问题,研制了机电液一体化集土式扩底钻机具。重点研究集土式扩底钻进施工工艺,集土式扩底钻具的机械结构设计、液压系统和电气控制系统设计,并进行机电液一体化集成试验。结果表明机电液一体化集土式扩底钻机具集扩孔、集土功能于一体,扩底直径准确、扩孔精度高,减少工艺步骤,提高工作效率,满足旋挖钻进扩底桩的施工需求,实现智能化扩底钻进。  相似文献   

地热预查孔深孔段φ131/79 mm取心钻具的研制与应用          下载免费PDF全文

张晓梅  孙智杰 《探矿工程》2019,46(9):74-80

山西省乡宁县十里铺一带地热资源可行性预查项目预查钻孔,由于深孔段复杂情况,被迫变更钻孔结构,原配置的φ152 mm石油系列单动双管取心钻具无法使用,因此研制了φ131/79 mm单动双管取心钻具,在分析取心钻柱组合力学特性的基础上,通过钻具使用与设备参数调整、钻具水路改进及深孔段取心钻进其它改进措施,使奥陶系及下伏寒武系层位全段不间断取心钻进取得了较好的效果。本文还对该专用取心钻具在深孔段的实际取心效果进行了数据统计与分析总结。  相似文献   

机械式自动垂钻工具粘滑振动抑制方法研究          下载免费PDF全文

张龙  张凯  周琴  李国民  刘宝林 《探矿工程》2019,46(11):43-49

机械式自动垂钻工具具有耐温性高、成本低、适用范围广等优点,是一种适用于深井和超深井控制井斜、提高垂直精度的重要技术手段。但由于其纠斜、防斜是靠重力及机械结构来实现的,在粘滑振动的工况下工作精度会受到巨大的影响。因此,本文从粘滑振动的产生机理出发,总结出其具体影响因素,并对现有国内外抑制粘滑振动的手段进行对比分析,寻求适用于机械式自动垂直钻具的可行粘滑振动抑制方法,为工具防斜纠斜能力的进一步提升提供可靠的技术保障。  相似文献   

Review and Prospect of Tillage Erosion Research     

Haichao Xu  Jianhui Zhang  Jiadong Dai  Yong Wang 《地球科学进展》2019,34(12):1288-1300

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井下声电成像测井仪的现状与发展趋势   总被引：12，自引：6，他引：6  

付建伟  肖立志  张元中 《地球物理学进展》2004,19(4):730-738

本文通过对成像测井仪器发展现状的考察,对常用的井下声电成像测井仪的原理进行了分析．对重要的技术指标进行了总结、对比．在此基础上,对成像测井仪器的发展进行了评述,认为：成像测井仪是目前最先进的测井仪器,在油气勘探开发中发挥着重要的作用．  相似文献   

WDS-A微扫测井测斜系统电路设计          下载免费PDF全文

程希  任战利  韩宗元  金平阳 《地球物理学进展》2009,24(2):791-796

为了完成测斜系统传感器信号调制、控制、三总线信号驱动、转换及上传数据解调电路功能,根据三总线信号特点,设计出一套数据接口、信号采集与控制电路,帧形成及字形成电路.经过室内及十余次野外油田试验,表明:接口及信号调制控制传输电路达到功能设计要求,微电扫测斜系统电子仪传输后转换精度达到4.2‰,表示每帧数据传输时间的时间字偏差不超过0.3‰,说明该短节电路设计可靠稳定,满足功能要求.  相似文献   

一起复杂的孔内事故处理与打捞工具   总被引：2，自引：1，他引：1  

王国芳 《地质与勘探》2000,36(4):76-77

通过工程实例,介绍了一种简易事故打捞工具。  相似文献   

顺序等离子体光谱法测定钢中钨、铬、钼、钴   总被引：1，自引：1，他引：0  

李建强  罗明标 《华东地质学院学报》2000,23(4):301-304

采取顺序等离子体光谱技术测定高速工具钢中的主要合金元素Ｗ,Ｍｏ,Ｃｒ和Ｃｏ。用扫描光谱法研究了分析线的选择和干扰情况,建立了准确、快速,同时测定主要合金元素的方法。  相似文献   

Part 3 Specialized aspects of GIS and spatial analysis     

Paul W. Box 《Journal of Geographical Systems》2000,2(1):49-54

GIS and spatial analysis is suited mainly for static pictures of the landscape, but many of the processes that need exploring are dynamic in nature. Dynamic processes can be complex when put in a spatial context; our ability to study such processes will probably come with advances in understanding complex systems in general. Cellular automata and agent-based models are two prime candidates for exploring complex spatial systems, but are difficult to implement. Innovative tools that help build complex simulations will create larger user communities, who will probably find novel solutions for understanding complexity. A significant source for such innovations is likely to be from the collective efforts of hobbyists and part-time programmers, who have been dubbed “garage-band scientists” in the popular press.  相似文献   

Implications of Arctic industrial growth and strategies to mitigate future vessel and fishing gear impacts on bowhead whales     

Randall ReevesCheryl Rosa  J.Craig GeorgeGay Sheffield  Michael Moore 《Marine Policy》2012,36(2):454-462

The objective of this paper was to investigate and illustrate how insights gained from experience managing human activities in order to protect North Atlantic right whales (Eubalaena glacialis) along the heavily industrialized east coast of North America might be applied in the Arctic, where bowhead whales (Balaena mysticetus) face some of the same risks as right whales. The reduced extent and thickness of sea ice and the resultant longer open-water season have major, complex implications for the Arctic marine ecosystem. Increased maritime ship traffic and commercial fishing in the Arctic are bound to affect bowheads and Native (indigenous) hunting communities who depend on whales for subsistence and cultural identity. Bowheads and right whales were greatly depleted by commercial whaling in the 19th and early 20th centuries. While the Western Arctic bowhead population has been recovering steadily in recent decades, North Atlantic right whales remain highly endangered because of persistent lethal and sublethal vessel strikes and frequent entanglement in commercial fishing gear. Entanglement can be transitory or persistent, with debilitation lasting for months before the animal finally succumbs. Vessel strike and fishing gear trauma has been documented in bowheads, but at a much lower rate than in right whales. Initiatives intended to mitigate the impacts of ship traffic on North Atlantic right whales have included speed limits and routing changes. Those meant to reduce the incidence and severity of entanglements include the modification of gear design and gear deployment practices. Management measures need to be considered in advance in the Arctic in order to minimize the risks to bowhead whales as shipping and industrial fishing expand in the Arctic with ice retreat.  相似文献