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砂卵石含水层的辐射井成井技术较复杂,施工条件高,难度大,而打成的辐射井比一般含水层的辐射井出水量多,调控浅层地下水时,地下水位降深大,稳定的快,单井效益高。1 砂卵石含水层的辐射井成井技术 砂卵石含水层的辐射井主要由竖井和集水管两部分组成。1.1 竖井的成井技术 竖井是辐射井的主体部分,采用反循环回转式钻井成孔,漂浮下管法成井。这种方法较沉井法投资少、速度快。竖井井壁是由不透水的钢筋混凝土构成,井座外径一般为2.8m,内径为2.5m,井筒的外径一般为1.86m,内径为1.60m。用反循环钻机成孔,然后将事先预制好的井座、井管一节接一节吊装到井孔中,漂浮下管,直到井座下到预定深度为止,并确保井筒直立。井筒接头采用“三油两毡”封闭接口,最后在井筒周围均匀回填好土。这种建造大口径竖井的方法,既简便,又稳妥。钻竖井时锥形钻头要有足够的重量,方能破碎土层。钻头刮刀的角度要合理,泥浆泵量与钻孔成比例,才能取得好的钻井效果。 相似文献
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4000 m交流变频电驱岩心钻机的研制及其 在地热井的工程应用 总被引:1,自引:1,他引:0
为满足深部找矿、科学钻探以及新能源勘探等对深孔取心钻探装备的需求,开展了4000 m地质岩心成套技术装备研究。4000 m地质岩心钻机回转系统采用顶驱系统,实现高转速下取心钻进;在井架底部设计有转盘回转系统,可进行大扭矩低转速钻进以应对不同的工况需求;钻机塔架和升降系统能进行长立根提下钻,可缩短提下钻作业时间;钻机的电传电控系统采用了目前国际先进的全数字交流变频技术及自动化、智能化控制技术、计算机控制技术、现场总线通讯和程序控制技术等,实现回转系统的无级调速和司钻的智能化控制。研制的4000 m交流变频电驱岩心钻机在天津东丽湖地热调查井(CGSD—01井)中应用,初步验证了其技术性能,具有操作简便、安全性与可靠性高、使用成本低等优点。本文介绍了4000 m交流变频电驱岩心钻机的项目来源、国内外研究现状、总体技术方案、主要结构及特点、主要技术参数、野外生产试验应用等情况。 相似文献
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通过对以往生产过程中浮力阀应用的总结,分析了木质浮力阀的工作原理,同时根据相关的公式和下管的需要,具体指出了浮力阀的设计制作与应用。 相似文献
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从钻井技术、成井管加工、下管注浆、扫孔提水等4个环节介绍了河北省地震观测井的施工技术,特别是管外注浆固井工艺,由于方法运用得当,很好地满足了设计要求。 相似文献
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大口径瓦斯抽放井施工工艺 总被引:2,自引:0,他引:2
瓦斯抽放孔要求井斜小,孔径大,下入的井管重量大。以实例介绍了使用GZ-2000型钻机在某煤矿瓦斯抽放站成功施工深400m,直径φ690mm瓦斯抽放井的施工工艺。在施工过程中采用φ216mm牙轮钻头+满眼钻具和钟摆钻具施工先导井眼,再采用φ410mm、φ690mm组合牙轮钻头+塔式钻具分级扩眼,使用电子多点测斜仪及时监测井斜变化,用钟摆钻具组合进行纠斜,在φ426mm管体上设置三组镶焊合金的肋骨条做成圆井器来进行圆井,在管体底部设置浮力阀,合理掏空以减少井管重量,确保了工程质量。 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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Inter-regional correlation of transgressions and regressions in the Cretaceous period 总被引:1,自引:0,他引:1
T. Matsumoto 《Cretaceous Research》1980,1(4):359-373
Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous. 相似文献
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The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism. 相似文献
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正20140751 Guo Xincheng(Geological Party,BGMRED of Xinjiang,Changji 831100,China);Zheng Yuzhuang Determination and Geological Significance of the Mesoarchean Craton in Western Kunlun Mountains,Xinjiang,China(Geological Review,ISSN0371-5736,CN11-1952/P,59(3),2013,p.401-412,8 相似文献
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正20141058 Chen Ling(Key Laboratory of Mathematical Geology of Sichuan Province,Chengdu University of Technology,Chengdu610059,China);Guo Ke Study of Geochemical Ore-Forming Anomaly Identification Based on the Theory of Blind Source Separation(Geosci- 相似文献
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正20141334 Chen Kun(Institute of Geophysics,China Earthquake Administration,Beijing100081,China);Yu Yanxiang Shakemap of Peak Ground Acceleration with Bias Correction for the Lushan,Sichuan Earthquake on April20,2013(Seismology and Geology,ISSN0253-4967,CN11-2192/P,35(3),2013,p.627-633,2 illus.,1 table,9 refs.)Key words:great earthquakes,Sichuan Province 相似文献
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正20141624 Cai Xiongfei(Key Laboratory of Geobiology and Environmental Geology,Ministry of Education,China University of Geosciences,Wuhan 430074,China);Yang Jie A Restudy of the Upper Sinian Zhengmuguan and Tuerkeng Formations in the Helan Mountains(Journal of Stratigraphy,ISSN0253-4959CN32-1187/P,37(3),2013,p.377-386,5 illus.,2 tables,10 refs.) 相似文献
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正20142263Lü Shaojun(Geological Survey of Jiangxi Province,Nanchang 330030,China)Early-Middle Permian Biostratigraphical Characteristics in Qiangduo Area,Tibet(Resources SurveyEnvironment,ISSN1671-4814,CN32-1640/N,34(4),2013,p.221-227,2illus.,2tables,22refs.)Key words:biostratigraphy,Lower Permian,Middle Permian,Tibet 相似文献
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正20142560Hu Hongxia(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130022,China);Dai Lixia Application of GIS Map Projection Transformation in Geological Work(Jilin Geology,ISSN1001-2427,CN22-1099/P,32(4),2013,p.160-163,4illus.,2refs.) 相似文献
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正20140692 Duo Tianhui(No.402 Geological Team,Exploration of Geology and Mineral Resources of Sichuan Authority,Chengdu611730,China);Wang Yongli Computer Simulation of Neptunium Existing Forms in the Groundwater(Computing Techniques for Geophysical and Geochemical Exploration,ISSN1001-1749,CN51-1242/P,35(3), 相似文献