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陕西渭南火车北站南部WR2号地热井的温度、压力和流量较以往陕西已成地热井相比,均创造了新高。该井采用三开结构,首次在地热井上采用双级注水泥法对水层套管上部进行了固井,其施工工艺、成井的关键环节都具有一定的典型性。 相似文献
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山东齐河1号裂隙岩溶型地热井储热层为奥陶系灰岩,其上部覆盖第四系、第三系、二叠系、石炭系地层,成井工艺复杂。应用气举反循环钻进工艺、PDC钻头、化学处理泥浆、技术套管等工艺方法,探索了裂隙岩溶型地热井成井钻进工艺技术。 相似文献
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岩溶地区冲孔桩施工技术措施探讨 总被引:7,自引:0,他引:7
周宗道 《地质灾害与环境保护》2002,13(3):79-82
岩溶地区由于地质条件复杂,建筑物桩基选型应慎重。根据工程经验,冲孔桩较适宜,但冲孔桩的施工仍存在一定的技术难点。某新机场航站楼地处石灰岩地区。第四系覆盖层中砂层厚度大,下伏基岩岩溶发育强烈、岩面起伏、倾角陡、裂隙发育、土洞及溶洞广泛分布,地下水埋深浅、地质条件相当复杂;冲孔桩施工时不可预见因素多,特别是成孔时事故多,全岩面难以正确判断、水下灌注混凝土困难等。在认真分析了施工过程中可能存在的技术难点后,不断摸索总结经验,有针对性的采取了各种合理有效的技术措施。 相似文献
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白山电站续建工程厂房开挖施工是已建的一期工程投入运行的基础上进行的,边界条件杂,具有一定的特点,介绍了续建工程厂房开挖施工方法,施工程序以及爆破施工技术措施。 相似文献
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在粉细砂-粉矿,粗-细砂,泥岩中成井的DR-Y1井,是宁夏地区的第一口地热勘探井,井深3100m,井身结构二开,开孔直径444.5mm,终孔直径244.5mm;选择般土聚合物体系泥浆,选配直径216mm硬质合金取心钻头,川8-3型取心筒,直径158.7mm,钻铤12根和直径127mm钻杆组成取心钻具;优选钻进参数;严格掌握钻井,割心及起下钻操作技术,确保取心成功率和岩心采取率均在90%以上,满足了水文地质的要求。 相似文献
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《China Geology》2018,1(2):187-201
Songke Well No.2, one of the main part of the scientific drilling project in Songliao Basin, which was drilled 7018 m and acquired the part of cores continuously from the Low Cretaceous to the Carboniferous and the Permian from the 2843 m deep, can be considered as the deepest continental drilling project in Asia. Aiming at the features of longer well sections, larger diameters and multiple spud-ins for coring of Songke Well No.2, this project broke through the “coring in small diameter and reaming in large diameter” spud-in drilling-completion procedures which are always used in large-diameter-well coring for continental scientific drilling projects in domestic and overseas and the drilling method of short-single-cylinder roundtrip footage. At the same time, “coring in the same diameter and completing drilling at one single diameter” was achieved at all φ311 mm and φ216 mm coring sections of more than one thousand meters long, high-efficient operation with “drilling long footage with drill tools combined in multi-cylinders” was achieved at deep coring section. Four world drilling records were created which include more than a thousand meters continuous coring at φ311 mm, and the footage per roundtrip footage at φ311 mm, φ216 mm and φ152 mm is all more than 30 m, all of these breakthroughs reduced at least 300 days for this project; moreover, considering the characteristics of formations that the geothermal gradient is high in the drilled sections and the inside-well temperature is over 240°C after drilling completion, a formate-polymer water-based mud system was developed by compounding attapulgite and sodium bentonite and by adding independently developed high-temperature stabilizer, which can provide critical technical support for successful well completion at 7018 m in the super-high-temperature environment It is the first time that the water-based mud is operated at the working temperature higher than 240°C in China; Besides, considering the high-quality requirement on cores imposed by the project, the method “mechanical cored is charge” to discharge core nondestructively on the ground was worked out, and more than 4000 m scatheless cores were discharged out of the drill pipes while maintaining original stratum structures. 相似文献
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山西介休鑫峪沟煤矿2号地面定向水平多分支钻孔,是采用注浆技术封堵奥灰水导水补给通道的注浆钻孔,本孔实际完成总工作量2194.86 m,其中直孔段490.27 m,水平孔段累计1704.59 m。本文详细介绍了该注浆钻孔施工的主要设备、冲洗液及钻探施工技术,并对钻探施工中的难点和经验体会进行了总结,为同类工程施工提供借鉴。 相似文献
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[摘 要] 20 世纪50 年代以来,激发极化法已逐渐被普遍的应用于地质矿产普查、工程地质、水文
地质、灾害地质、深部油气等方面勘测,获得了理想的效果。但之前鉴于设备性能以及供电功率等方面
的限制,激发极化法的有效探测深度几乎一直停留在500m 之上,对500m 以下的地质体激电响应难以
准确摄取。本文所讨论的激电测深单极-偶极工作装置拟地震观测系统测深技术以其探测深度大、测深
效果好、工作方便效率高等优点正好在一定程度上满足现阶段的地质找矿需求。文章结合某Pb、Zn、Ag
多金属矿区实际应用重点对该测深技术野外工作方法与特点进行讨论,同时结合地质认识对应用效果
进行了分析与总结。 相似文献
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