共查询到20条相似文献，搜索用时 62 毫秒
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作者结合水平定向钻穿越的实践,对典型岩石扩孔器,如滚刀型岩石扩孔器、低扭矩岩石扩孔器、对开式岩石扩孔器的结构特点和适应性进行了分析,提出了水平定向钻要根据穿越地层的类型选择岩石扩孔器的尺寸和型式,选择岩石扩孔器要注意扩孔器的使用寿命;并建议岩石扩孔器本体设计时应考虑具备反向退出钻孔的功能,扩孔器产生的钻屑粒径能足够小,以使泥浆悬浮钻屑并顺利排出到地表;提出了岩石扩孔器的具体操作控制要点,从而达到快速、高效、高质量扩孔的目的,降低穿越施工的风险。 相似文献
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作为非开挖施工的一个分支,定向钻穿越技术得到了越来越广泛的应用。本文以DN630供水管道定向钻穿越淮河工程为例,介绍了定向钻穿越的技术特点,指出了设计基本原则及设计要素如管道钻进的入土角、出土角、曲率半径和穿越深度等确定方法,并阐述了定向钻穿越施工工艺流程及泥浆配制、钻导向孔、扩孔及管道回拖等主要施工工艺。 相似文献
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水平定向钻在南水北调配套工程输水管线穿越中的应用研究:以沙颍河穿越工程为例 总被引：1，自引：0，他引：1
以沙颍河水平定向钻2号管穿越工程为例,应用理论分析及数据分析的方法对施工过程中导向孔钻进6次、扩孔扭矩大且耗时长、回拖管道时发生扩孔器断裂事故等问题进行了研究,总结了大直径水平定向钻穿越施工的经验与教训,为今后水平定向钻进技术在南水北调等资源和能源管道项目中的应用提供重要借鉴。研究结果显示:地磁有线控向系统+无线控向系统的双控向系统可有效降低导向孔失败风险;泥浆配制及净化设备不完善是引起沙颍河穿越工程施工不顺利的重要原因;根据地质条件选择合适的钻具可有效提高施工效率;回拖扩孔器断裂的原因是疲劳断裂,采用人工顶管法处理事故有借鉴意义;松散地层中连续施工可降低孔壁失稳风险。 相似文献
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在进行大口径管道的定向钻施工时,由于需要进行多级的扩孔施工,扩孔器和钻杆钻具的重力作用使扩孔器下沉位移的现象尤为严重,造成工期和材料消耗的增加,且使得大口径的孔壁稳定性也有所下降,施工难度增大。本文就目前的水平定向钻穿越扩孔施工进行分析,探讨合理解决该问题的措施。 相似文献
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立沙油品储运项目输油管道东江穿越工程,管道穿越水平距离为1085m。穿越地层主要为不同风化程度的花岗岩及砂层等复杂地层,其中穿越最硬岩石单轴饱和抗压强度达到36．7MPa,采用大型非开挖水平定向钻机进行施工。简述了施工测量及确定方位角、钻导向孔、扩孔及管道回拖等主要施工过程。通过采用加设直径300mm导向套管、布置人工磁场等施工措施,有效地保证了穿越轨迹与设计曲线重合;存泥浆中添加堵漏剂等外加剂,防止泥浆从岩石裂隙巾流失;在施工至砂层时增加泥浆粘度及添加润滑剂等措施防止塌孔．同时减小扩孔及回拖阻力：采用开挖发送沟并在沟内灌水,使管道存孔内保持悬浮状态等措施以减少管道的摩擦阻力,确保管道顺利回拖。 相似文献
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湘江定向钻穿越是湖南成品油管道二期工程的重点工程,穿越地段主要地质为灰岩、溶洞及岩石裂隙等,出入土两端还需穿过部分卵砾石段,造成导向难度及不易成孔;导向过程中曾发生掉钻、扩孔过程中发生卡钻,通过运用图表、技术分析等,结合相关类似工程,成功解决了掉钻、卡钻及泥浆问题,成功穿越含有溶洞的湘江穿越。 相似文献
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采用非开挖定向钻进的方法穿越深圳麒麟立交桥铺设石油管道，管道为φ3239 mm无缝钢管，长度512 m。该穿越地段为全风化花岗岩地层，在这种地层中进行非开挖定向穿越施工难度比较大。介绍了施工中出现的问题及解决办法，并详细介绍了钻进、扩孔、泥浆、布管、拉管等施工方法。 相似文献
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本文介绍了天然气管道在复杂地质条件下定向钻穿越工程的施工工艺情况,结合江西天然气定向穿越成功工程实例,分析了复杂地质条件下导向孔钻进、钻具选配、泥浆配比方案等风险的防范,为类似工程的施工提供一定的参考。 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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正1 Introduction Geological studies established on several sections in Lanping-Simao basin have shown that the salt-bearing strata of Mengyejing formation(Yunlong Fm.in Lanping basin)are constituted by an alternation of salt layers and interbedded facies.The latter consists mainly of mudstones,and mudstone-rich conglomerate.The mineralogy and geochemistry of salt-bearing beds and 相似文献
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正On 22nd April 2014,with the approach of the 45th World Earth Day,China’s Ministry of Land and resources issued the status of China’s mineral resources in 2013.The first task of the prospecting breakthrough strategy action implemented in the last five years has been completed,and China’s security capacity for mineral resources has been significantly improved.In the 相似文献
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正There are more than 700 salt lakes with area of more than 1km2 on the Qinghai-Tibet Plateau of China.In recent years,an oilfield brine was also found in the Nanyishan Section of Qaidam Basin in the Qinghai-Tibet 相似文献
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正1 Introduction Physical and numerical models are constructed to investigate the evolution and mechanism of salt migration driven by tectonic processes.In recent years,we have designed and ran series of models to simulate salt 相似文献
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YUAN Qin LI Jianguo QIN Zhanjie WEI Haicheng SHENG Shurong SHAN Fashou 《《地质学报》英文版》2014,88(Z1):276-276
正The study of Cretaceous-Palaeogene salt-bearing strata of the Khorat Basin Laos and the Lanping-Simao Basin in Yunnan,China has an great significance not only in explaining the basin evolution and the genesis of potash 相似文献
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正Potash is one of the long-term scare deposits in China,and potash prospecting has long been listed as a key brainstorm project for our nation and geological prospecting units.There have been considerable studies in search for potash deposits in the Kuqa depression of the Tarim basin(Jackson et al.,1991;Gemmer et al.,2004;Vendeville,2005;Vendeville and Jackson,1992a,1992b), 相似文献
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正1 Introduction Qaidam Basin in Qinghai,including 43 salt lakes with multiple dominant mineral such as potassium,magnesium,lithium etc.,is the most intensive distribution of Saline 相似文献