共查询到20条相似文献，搜索用时 125 毫秒
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鞍山地质公司在棉花地区钻探施工中,遇到离地表100～300米的混合岩,裂隙发育,硅化程度也较高.采用双管人造金刚石钻头钻进时,岩芯堵塞严重,钻进效率很低,而用单管人造金刚石钻头钻进,则钻头寿命显著降低.1980年7月,鞍山地质公司与中南矿冶学院达成试验高效长寿的单管人造金刚石钻头的协议.协议要求:钻头寿命从原有的20米提高到30米;时效从原有的1.4米增加到1.8米.通过几个月的研究和试验,已完成并超过了所要求的指标.试验结果是:钻头平均寿命为41.1米,提高了105.5%,时效平均为2.04米,提高了45.7%. 相似文献
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新型打滑地层钻头的研究 总被引：1，自引：1，他引：0
钻探施工中,经常遇到打滑地层,为了解决打滑地层钻进难题,国内外专家设计了不同类型的金刚石钻头,但都有一定的局限性.金刚石增强型硬质合金复合齿钻头保证了切削齿具有良好的自锐能力、切削齿与岩石接触面的比压大等特点,从本质上提高了钻头对打滑地层的适应性.室内微钻试验表明,金刚石增强型硬质合金复合齿钻头钻进打滑地层时具有高时效的优点. 相似文献
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针对在坚硬致密岩石中钻进时效低和钻头使用寿命短的技术难题,分析了热压钻头的金刚石出刃与岩石研磨性等岩性之间的内在联系,认为钻头的胎体成分及其性能是关键,硬而带脆性的胎体性能有利于金刚石出刃,从而能提高钻进速度。因此,从热压金刚石钻头的胎体成分与性能研究入手,经过反复的试验研究,试制出了热压铁基孕镶金刚石钻头,取得了突破性的进展。在坚硬致密岩层中钻进,钻进时效由0.5 m左右提高到1.17 m,钻头寿命由10 m左右提高到21.31 m,解决了在坚硬致密岩层中钻进难的问题。试验研究结果说明,铁基合金是一种新型的金刚石钻头胎体材料,热压铁基孕镶人造金刚石钻头是一种新类型的金刚石钻头。 相似文献
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针对在硬而致密岩石中钻进时效低和钻头使用寿命短以及传统金刚石钻头胎体材料价格高等众多难题,采用混料回归试验设计方法,进行了替代碳化钨基金刚石钻头胎体材料的新型铁基胎体配方的试验研究;分析了热压钻头的金刚石出刃与岩石研磨性等岩性之间的内在联系,认为钻头的胎体成分及其性能是关键。因此,从热压金刚石钻头的胎体成分与性能研究入手,经过反复的试验研究与优化组合,研究出热压高磷铁基孕镶金刚石钻头的胎体材料,并试制出金刚石钻头。在室内对可钻性Ⅸ级岩石进行钻进的试验表明：钻进时效平均达到1．91m,钻头平均工作寿命达到60．26m。试验结果表明,高磷铁基眙体是一种性能良好的金刚石钻头胎体材料,且该类型胎体的热压金刚石钻头是一种成本明显降低、具有广谱性能的金刚石钻头。 相似文献
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孕镶金刚石钻头是目前破碎岩石有效工具之一。在钻进中孕镶金刚石钻头的钻岩效果,存在很大差异,同类型钻头在不同的岩石中钻进,其平均时效或钻头寿命可以相差数十倍。因此,根据岩石特性合理选择和使用金刚石钻头,是达到优质、高效、低耗钻进的重要因素,对提高金刚石钻头的技术经济效果具有重要的现实意义。 作者在多参数模拟回转钻进试验台上,对花岗闪长斑岩、磁铁石英岩等三十余种岩石进 相似文献
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工程勘察在同一个钻孔中需要面对不同风化程度的岩石层,并可能遇到不同粒径与胶结性的卵砾石层。因地质条件较为复杂,工程勘察钻进过程中容易产生憋钻、糊钻等现象,岩心采取率低。针对工程勘察钻进特点,为提高金刚石钻头对地层的适应性和钻进效果,并提高岩心采取率,设计了2种新型非均质热压金刚石钻头。该结构将每个工作齿分成主、辅工作层两部分,可以使钻头既具有PDC钻头破岩的特征,又能体现孕镶金刚石钻进的特色,并提高钻头对地层的适应性。现场试验表明,该结构的钻头在风化岩层和基岩中的平均钻进时效达2.68 m,钻头使用寿命平均达48.70 m;对比电镀金刚石钻头,钻进速度提高约21%,使用寿命相当。 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20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
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正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
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正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
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正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
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正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献