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《地质科技情报》2016,(1)
为了实现东濮凹陷深层断块低渗油气资源的低成本开发,采用水平井开发和简化井身结构成为必然的选择。但是作为开发中后期的老油田,地层压力系统紊乱,简化井身结构后,同一裸眼段内高低压共存,易导致滑动钻进压差卡钻和井壁失稳;同时沙一至沙三段泥页岩发育,长裸眼段内井壁坍塌、掉块问题突出。为此,应用横观各向同性模型,考虑水化时间对强度的影响,兼顾井下安全和钻井投资,确定出技术套管的合理下深;优选聚胺抑制剂和梳形聚合物降滤失剂,应用油基钻井液,提高泥页岩地层井壁稳定能力;引入无土相烷基糖苷钻井液,提高润滑性,降低钻进摩阻;应用降压耗钻具组合,解决小井眼清除岩屑问题;设计小弯角螺杆配合欠尺寸稳定器的水平段提速钻具组合,提高机械钻速,降低钻井周期,规避坍塌周期风险,提高复合钻进比例,降低定向滑动压差卡钻风险。7口井的现场应用效果表明,钻井周期缩短了30.95%、卡钻事故降至0次,实现了东濮凹陷大压差泥页岩长裸眼斜井段安全钻井。 相似文献
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重庆涪陵焦石坝地区上部地层岩性致密、研磨性强、可钻性差,长兴组浅层气活跃且含硫,三开水平段长、摩阻大、泥质页岩层易垮塌。钻井面临的突出问题是机械钻速低、井控难度大、钻井周期长。针对上述气藏钻井难点,重点从钻井工艺、维持井壁稳定以及钻井液方面进行分析,优化钻具结构、优选钻头选型、抑制井壁失稳以加快焦石坝区块钻井速度。“油基螺杆+高效PDC钻头”配合优质钻井液,经过焦页12平台4口井的实践应用,大大缩短了钻井周期,焦页12-4 HF井创下了中石化集团公司非常规页岩气水平井最长水平段记录,提速效果显著。 相似文献
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为了研究油页岩的地下原位开采技术,设计施工了FK-1井。该井地处吉林省松原市扶余县,完钻井深500 m,完钻层为嫩江组地层。该井设计施工中主要需克服大口径钻井的保直钻进、软塑性地层的裸眼钻进、水敏性地层中钻井液的应用、泥页岩层中发生钻头泥包现象及原位开采井的特殊成井、固井等问题。通过对钻井设备的优选,钻井液性能和井身结构的相应优化,钻头和钻具组合的选择等措施来解决钻井过程中的施工难题。设计结果在施工过程中进行了应用,施工效果良好,缩短了钻井时间,减少了钻井投入,解决了施工难题,为同类钻井的施工提供了借鉴和指导依据。 相似文献
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涪陵页岩气田开发过程中最大的问题就是井漏,据统计,有67.2%的井在钻井过程中都发生了不同程度的漏失,影响了钻井工程质量、进度及效益,特别是三开长水平段漏失油基钻井液,造成了严重的经济损失。为了降低钻井工程风险、提高钻井速度、降低钻井成本,从现场实际情况出发,对钻井漏失情况进行了统计分析,认为中浅层漏失以溶洞型漏失、缝洞型漏失为主,龙马溪、五峰组漏失以裂缝型漏失为主。重点介绍了针对涪陵页岩气田各开次特点采取的防漏堵漏技术及现场应用情况。同时随着开发区域扩大,地质情况有所改变,井漏问题更加复杂,提出了下一步防漏堵漏技术发展方向及建议。 相似文献
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中江19H井是川西中江地区的一口长水平段水平井,设计井深3830 m,水平段长990 m。目的层为下沙溪庙组,是开发中江地区该层位的首口水平井,邻井参考资料少。中江地区地层裂缝发育,普遍存在井壁失稳现象,极易产生掉块,同时,该井设计二开裸眼段长,更恶化了井壁失稳,施工中产生大量掉块,掉块在井眼局部堆积形成砂桥造成该井水平段卡钻。仔细分析了该井卡钻原因,提出了优化钻井液性能、优选钻井工具、优化水平段钻具组合、加强井眼净化等相应预防技术措施,顺利完成了该井的后期侧钻施工。为川西中江地区下沙溪庙目的层的开发提供了宝贵施工经验。 相似文献
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欠平衡钻井技术是准确发现和评价油气资源的方法之一,尤其适合评价和开发低压低渗油气层。介绍了梨深1井四开井段实施欠平衡钻井技术的详细情况。该井四开钻井液密度0.90~1.05 g/cm3,使钻井液液柱压力低于地层压力,地层大量气体侵入井筒,进一步增大井底欠压差。自井深3582.5 m后一直维持点火钻进,为后续井钻井施工提供了很好的借鉴。 相似文献
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近年来,随着海域天然气水合物的勘探不断深入,为了进一步提高产量,加快实现海域天然气水合物商业化开采步伐,水平井开发成为了增产的重要手段。然而浅软地层水平井施工过程中,面对浅软未成岩地层,重点要解决好大斜度井段和水平井段的井眼清洁、井壁稳定、流变性能控制,润滑降摩、防漏等关键技术。本文从浅软地层水平井钻井液技术难点出发,通过室内研究和现场试验,形成了一套满足浅软地层水平井钻井施工的钻井液体系和钻井液施工工艺,并在陆地进行了多口浅软地层水平试验井施工,确保了钻完井顺利实施,为我国海域天然气水合物水平井试采提供了大量的现场试验数据。 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
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正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献