共查询到20条相似文献，搜索用时 171 毫秒
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金刚石钻进中,遇到漏失层常采用水泥浆水泵灌注方法,其效果虽好,但工艺较复杂. 1985～1986年,我队施工的金窝子矿区,在80m范围内有一层强烈蚀变带,大部分钻孔出现裂隙性全孔漏失,3台金刚石钻机昼夜消耗清水4t.我们采用井口倒入法灌注水泥浆,灌注钻孔27个,候凝时间4～48小时,漏失层深10～74.06m,成功率100%.具体做法是: 1.首先要测准水位.如井内水多,水泥浆易稀释,需用自制的球式逆止阀捞水后再行灌注. 2.捞水后如水位回升快,可将一袋水泥按0.3的水、灰比搅拌后投入井内,使水位升高,并从裂隙流走.如一袋不够,可再加一袋,以将孔内水挤干为准.然后按正常水、灰比灌注水泥浆. 3.计算水泥浆重,应按比钻进口径大二级考 相似文献
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大水灰比水泥浆-水玻璃速效灌浆堵漏法，是我队通过帷幕灌浆之后，结合钻探施工中钻孔堵漏特点，将岩石基础灌浆法引用于岩心钻探钻孔护壁堵漏。通过某金矿区试验，效果很好。其优点是时间短，见效快，成功率高，材料消耗少。有效地避免了采用较大颗粒的惰性材料堵漏中，经常出现的一堵就返水，一钻又漏的情况，深受机台人员的欢迎。1．堵漏原理 主要是靠送入较大的水灰比（3∶1—0.5∶1）的水泥浆，在注浆泵的压力作用下，向钻孔裂隙中（漏失部位）压入。因浆液水灰比较大，水泥颗粒细小，易被挤进细小的裂隙中去，随着扩展面 相似文献
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在钻探施工过程中,由于工程要求,必须对钻孔做孔口压水试验,根据钻孔吸水量、压力数据,检验钻孔的漏失及其他情况。传统孔口压水试验使用的孔口装置,必须把孔内钻具提出孔外,严重地影响工程施工进度。分体式不提钻钻孔压水试验孔口装置的研发,可在不提钻的情况下完成孔口压水试验作业,大幅度缩短施工工期,减轻工人的劳动强度,减少安全事故的发生,对钻探工程施工具有一定的经济价值和现实意义。本文详细介绍了研制的分体式不提钻钻孔压水试验孔口装置的结构、工作原理及使用方法,并与传统孔口压水装置进行了试验对比,验证了分体式不提钻孔口压水试验孔口装置工作的可靠性及优势。 相似文献
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我队从1682年在黄山东矿区开始探矿施工，主要困难是绝大部分钻孔严重漏失，几乎孔孔都是多层漏失，有的钻孔出现300米长孔段连续漏失。由于钻孔漏失严重，阻碍了探矿生产各项经济技术指标的提高。为解决漏失问题、近几年来我队采用了R型地勘水泥堵漏。但是对小裂隙、长孔段和漏失部位不明确的漏失地层，其堵漏效果不好。经PAM—粘土—地勘水泥交联堵漏，效果良好。 相似文献
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钱学溥 《水文地质工程地质》1958,(2)
一、在水工建设的工程地质勘察中,压水试验是测定裂隙性岩层渗透性质的重要方法之一。在压水试验过程中,地下水位位于试验段中间是每个钻孔经常遇到的情况。我们认为地下水位处于试验段中间时水柱压力的计算在已往一些文献和规范里(参阅1957年第8期水文地质工程地质月刊“钻孔压水试验”和地质部水文地质工程地质局及水文地质工程地质研究所编“钻孔压水试验操作要求”1957年11月地质出版社出 相似文献
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川西南某铅锌矿区地质条件复杂,第四系、基岩风化带和基岩段多以软硬夹层和裂隙发育的岩石为主,局部漏失比较严重。为了解决该区域地层钻孔的漏失问题,笔者在分析地层及现场工艺条件后,提出并设计了采用新型高分子材料马丽散E堵漏剂和水泥浆堵漏技术。该堵漏剂初凝和终凝时间较短,操作过程比较简单,注入孔内后,低粘度混合物能保持液体状态几秒钟或几分钟,能够很好地渗入到地层的细小裂隙中。通过现场漏失钻孔段的实际堵漏验证,该方案可以有效解决地层漏失等问题,减少了辅助时间,降低了工程成本,提高了钻进效率。 相似文献
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一、地层与施工简况我队施工的渔溪矿区钻遇岩层节理、裂隙非常发育，所施工的钻孔都存在严重渗漏，并有坍塌、掉块现象。使用松香酸钠、PAM无固相冲洗液和PAM低固相泥浆均不上返，多次采用浓泥浆（25秒）护壁堵漏和灌早强水泥堵护均无成效。多数钻孔采用顶漏钻进，经常待水，个别钻孔因漏失、坍塌严重而被迫半途而废。如该矿区ZK3005孔，设计孔深550米，钻孔倾角80度，由于钻遇大断层、破碎带、孔内漏失、坍塌严重，采用水泥堵护三次无效，共消耗水泥1900公斤。后采用PAM配制的浓泥浆钻进，仍然全泵漏失。共耗粘土粉157 相似文献
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超低密度泡沫水泥浆是解决低漏失压力井固井漏失,提高固井质量的有效措施。除泡沫水泥浆体系的开发与性能优化外,掌握泡沫水泥浆在环空内产生的静液柱压力随井深的变化规律,是成功实施该工艺技术的前提。借助实际气体状态方程,考虑温度、压力变化对充入氮气的影响,建立了静液柱压力和水泥浆密度与井深之间的数学模型,以迭代法编程求解该隐函数方程,并借助VB语言实现程序运算。分析了含气量变化、井深等因素对泡沫水泥浆密度及静液柱压力的影响规律,并提出了泡沫水泥浆“防漏”与“压稳”固井浆柱结构设计思路,为该工艺平衡压力固井设计提供了一定的参考和理论依据。该设计方法经现场应用,证实其运算结果的可靠性。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 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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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献