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本文结合生产实践,对煤田钻探绳索取心技术的钻孔结构、钻头选择、粉煤取心、护孔堵漏、钻具配套等问题,提出了一些认识。包括孔径确定、钻具级配、孔身构造、技术套管;钻头选型、胎体磨料、水口形态;粉煤钻头、碎岩取心器、自锁半合管;冲洗液选型、随钻堵漏、停钻堵漏工艺;以及应用加长岩心管、钻杆接手、防斜接手、可退式打捞矛等。 相似文献
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近年来,国内外对复杂地层绳索取心钻具的研究取得了长足进步,但是未能很好解决卡心构件对岩心入管的阻碍和底喷式钻头易产生“泥垫”现象,从而影响取心质量和钻进效率的关键技术问题。以普通S95绳索取心钻具为研究对象,通过在内管里增设0.7 mm厚度的不锈钢衬管,封隔卡簧等卡心构件装置,增加底喷式钻头水孔数量并增大水槽体积,设计可供选择的发夹式和卡簧式岩心提断器等技术改造,研制一款用于复杂地层钻进,具备隔水、隔卡、自动锁心的三层管绳索取心钻具。选用发夹式岩心提断器在水敏性强的破碎地层中试验,平均回次进尺1.13 m,获取岩心采取率94.48%,对比附近同类地层钻孔的岩心采取率提高了50%以上;选用卡簧式岩心提断器在裂隙发育的泥质地层中试验,卡簧卡心如同普通钻具上的卡簧一样可靠。试验结果表明:用衬管封隔卡心构件的取心技术方案可行,解决了卡心构件对软弱松散岩心入管的阻碍,有利于保护岩心的原状性;所用底喷式钻头孔底冲洗效果好,降低了钻头“泥垫”现象对钻进速度的影响。该钻具操作方便,使用成本低廉,有望在我国现行绳索取心机台推广应用,具有较强的普适性和广泛的应用前景。 相似文献
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砂岩取心是迄今为止仍然没有完全解决的钻探技术难题。砂岩的种类很多,但都有共同的特点：结构比较松散,无胶结或少量胶结,遇水膨胀,透水性好。在砂岩中钻探取心,岩心采取率不高,钻孔容易垮塌。为了解决砂岩取心钻探中的技术难题,从钻进工艺技术参数、取心器结构、钻头优化设计、冲洗液配方、钻机配套、岩心烧结卡取以及水压出心等多方面开展研究,总结出了一套砂岩取心技术,应用在实际钻探生产中,取得的各项技术指标完全满足地质要求,为地浸砂岩取心钻探提供了宝贵的经验。 相似文献
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《煤田地质与勘探》2021,(4)
近年来,国内外对复杂地层绳索取心钻具的研究取得了长足进步,但是未能很好解决卡心构件对岩心入管的阻碍和底喷式钻头易产生"泥垫"现象,从而影响取心质量和钻进效率的关键技术问题。以普通S95绳索取心钻具为研究对象,通过在内管里增设0.7mm厚度的不锈钢衬管,封隔卡簧等卡心构件装置,增加底喷式钻头水孔数量并增大水槽体积,设计可供选择的发夹式和卡簧式岩心提断器等技术改造,研制一款用于复杂地层钻进,具备隔水、隔卡、自动锁心的三层管绳索取心钻具。选用发夹式岩心提断器在水敏性强的破碎地层中试验,平均回次进尺1.13m,获取岩心采取率94.48%,对比附近同类地层钻孔的岩心采取率提高了50%以上;选用卡簧式岩心提断器在裂隙发育的泥质地层中试验,卡簧卡心如同普通钻具上的卡簧一样可靠。试验结果表明:用衬管封隔卡心构件的取心技术方案可行,解决了卡心构件对软弱松散岩心入管的阻碍,有利于保护岩心的原状性;所用底喷式钻头孔底冲洗效果好,降低了钻头"泥垫"现象对钻进速度的影响。该钻具操作方便,使用成本低廉,有望在我国现行绳索取心机台推广应用,具有较强的普适性和广泛的应用前景。 相似文献
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石楼北区块位于鄂尔多斯盆地东缘。该区域表土层松散易坍塌,在以往的钻探施工中,地层中不同程度的存在涌水或者漏失情况。太原组第三层灰岩可钻性较差,取心作业中频繁发生钻头被堵死的情况。为了解决以上问题,缩短施工工期,对钻具组合和钻井参数进行了调整,采用四翼PDC钻头、直螺杆的钻具结构;取心作业主要采用绳索取心,采用①215．9mm的取心钻头代替该区以往的016．9mm钻头,利用Φ127mm钻杆作为绳索取心工具的运行通道,并采用自行研制的内外管总成和内管取心工具．保证了取心效果;将钻头水眼更改为12mm×2＋14mm＋16ram的组合方式,有效保持了钻孔内的清洁,避免岩屑重复破碎,进一步提高钻进效率。同时介绍了钻探施工程中设备的配套、钻井液的配制、钻井技术参数的选择等。结果表明：该井取心岩心总收获率为92．15％,其中8#煤心质量总采取率为93．50％;井斜3°10′,全井水平位移44．17m,最大全角变化率耋1．1。／30m。对该区煤层气井钻探施工有很好的借鉴作用。 相似文献
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金刚石绳索取心钻进技术的优点之一,是岩心采取率高、施工质量好。但是,在赤峰杜家地矿区钻探中,采用普通双管和绳索取心钻具,却常常取不上岩心来。为此,我们设计了φ75双管双动内钻头超前硬质合金钻具,通过生产实践,基本上解决了复杂地层的取心问题。钻具结构原理钻具结构原理如附图所示,它由双管接手、接手内设的反水泄压球阀、外岩心管及外钻头、内岩心管及内钻头等组成。其工作原理是,轴心压力通过双管接手传递到内、外管,再由内、外管传递到内、外钻头;回转也是通过双管接手传动内、外管及内、外钻头回转钻进。冲洗液通过双管接手之通水 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20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献