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为治理龙庞矿陷落柱实水事故，采用螺杆钻进技术在陷落柱南缘设计施工两个定向井Z5-1及Z5—2。以Z5-1定向井为例，使用Ф117．6mm钻头，采用优质化学泥浆，钻压35～40kN，随钻钻进至480m后改为回转钻进，在稳斜钻具钻到516．45m处进行水泥浆堵漏，边堵漏边钻进，并且每钻进10m左右测斜一次，直到中靶。 相似文献
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《地质与勘探》1986,(6)
小口径金刚石取心钻进多孔段裂隙渗漏的复杂地层,是当前的一个技术难题。河北省地矿局地质六队木吉村矿区7402号孔,采用φ56毫米口径金刚石绳索取心、优质泥浆钻进,自孔深172米以下出现裂隙性渗漏和涌水,孔深200米后,渗漏严重,拟通过提高泥浆粘度处理孔内坍、掉及涌漏,但由于绳索取心钻具与孔壁环状间隙小,冲洗液回返速度快,以及钻具回转离心力的作用,致使泵压升高,管内结垢,影响了继续钻进和内管打捞。在孔深158～196,280,310米等处,曾采取灌注水泥、水玻璃速凝堵漏液等措施堵漏,效果也不明显。同时,由于岩层破碎,裂隙性漏失经常发生,用上述方法堵漏,常要停钻而影响生产。因此,一直在使用优质低固相泥浆顶漏钻进(漏失量为1.3～1.5米~3/时),不仅待浆时间长,而且泥浆费用高。 相似文献
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鄂尔多斯盆地镇泾工区钻井中遇到井漏难题,针对不同的漏失特点采用不同方法堵漏。第四系黄土层漏失采取控时钻进加短程起下钻方法;渗透性砂岩层漏失采用以预防为主,随钻加入单封堵漏方法;纵向裂隙层漏失采用复合堵漏材料方法,恶性漏失采用桥接材料＋水泥封堵方法。实践证明,所采用的堵漏技术措施有效。 相似文献
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复杂地层钻探堵漏浆液的研究与应用 总被引：8，自引：0，他引：8
在钻进复杂地层的过程中,漏失会造成冲洗液不同程度的流失,失去冲洗液的功能,导致钻进困难,钻速下降,以致孔壁坍塌发生卡钻、埋钻事故。此外,如遇到高气压层、水气,也可能发生喷气和涌水事故。为了确保安全钻进,必须采取一定的技术措施以防止冲洗液的漏失。泥浆是一种常规的护壁堵漏的措施,但对于坍塌漏失较严重的情况,就必须采用其它材料进行堵漏。本试验采用复合水泥浆液进行堵漏,对浆液中加入的处理剂与浆液性能改变之间的关系进行分析总结,主要对浆液的凝结时间、流动度、析水率等方面进行研究,再进行多组试验得出用以解决复杂地层堵漏的浆液优化配方。 相似文献
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针对甘肃西和大桥金矿区地层破碎、裂隙发育,漏失、坍塌、卡钻、埋钻等钻进难点,采用金刚石单动双管钻进工艺和聚丙烯酰胺小分散低固相冲洗液护孔技术,并采用多种堵漏措施,取得了较好的技术效果。总结了该矿区复杂地层钻探施工的经验。 相似文献
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M-2井为马头营干热岩开采试验井组的采出井,为解决M-2井在钻进过程中新生界地层坍塌、钻头泥包、太古界花岗岩地层钻进效率低、溢流、掉块以及高温钻井液等施工难点,进行了钻井关键技术研究。通过增加钻井液比重、降低滤失量、提高黏度,维护了新生界井壁稳定性; 采用双泵大排量、转盘高转速旋转,解决了钻遇新近系钻头泥包问题。在井深3 880 m处,通过提高泥浆比重,并加入随钻堵漏剂,有效遏制了溢流、大消耗和掉块; 通过改进耐高温钻井液,提高了泥浆的流变性,降低了摩阻和转盘扭矩,保障了M-2井的顺利完井。通过更改钻具组合,采用大螺杆、大钻压、大排量、粗径钻具,使M-2井在太古界变质花岗岩地层中平均钻速达到2.46 m/h,比M-1井同地层纯钻速提高了69.7%,降低了钻探成本。旋锤机配合金刚石复合片(polycrystaline diamond compucts,PDC)钻头提速实验,证明了该方法可有效提高钻进效率,但变质花岗岩地层较硬、研磨性强,PDC片易崩坏,钻头性能仍有待改进。相比而言,采用ϕ203 mm螺杆+牙轮钻头钻进整体效益更高,可作为后续施工中的优选方案。 相似文献
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泸州深层页岩气储层埋深达4000 m,属于高压力地层,所钻遇石牛栏组地层岩性为含砂泥岩,本区内多口井钻遇高压裂缝气,溢流及井漏风险大,时常出现高套压事件;同时一些井存在采用高密度钻井液钻进至类似地层时发生漏失后又返吐的现象,给堵漏和钻进作业带来较大困难。针对该类呼吸性地层井漏,以Y101H3-4井为例,现场试验了一系列堵漏方法及措施,结果表明：常规堵漏工艺对呼吸性地层堵漏效果不佳,堵漏材料粒径难以匹配,易导致封门堵漏失败;针对同平台邻井实钻油气显示情况,合理降低钻井液密度有助于堵漏作业实施;油基水泥塞是解决此类呼吸性井漏最有效的工艺技术,但前提条件是确定合理钻井液密度,降低注水泥过程中的返吐量,防止水泥浆与钻井液直接接触污染。在泸州区块采取降密度+注油基水泥塞堵漏是解决呼吸性地层井漏的最佳方法,可快速解决该类地层的堵漏难题。 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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Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
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正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
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正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
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正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
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正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
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正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献