共查询到20条相似文献,搜索用时 78 毫秒
1.
为了确保可膨胀波纹管在φ120 mm地质钻井中实现封隔漏失地层的功能,在合理设计8字形波纹管截面形状的基础上,采用有限元理论模拟了不同壁厚和材料的波纹管水力膨胀成形过程,并进行了室内水力膨胀试验。结果表明:波纹管壁厚越薄,膨胀效果越好,但壁厚必须满足抗外挤强度和抗内压强度条件;适用于φ120 mm井眼的8字形波纹管,其材质应符合如下条件。屈强比≤0.6;延伸率≥25%;抗拉强度σb≥410 MPa;试制的波纹管膨胀后最小外径能够满足后续机械膨胀要求,最大膨胀压力为13.6 MPa,符合钻探现场使用条件。研究结果为波纹管野外试验提供了技术支撑。 相似文献
2.
膨胀波纹管技术是将圆管制成异形截面管,下入孔内后胀圆维护孔壁稳定的一种新兴钻探技术。针对地质勘探的行业需求,提出了一套膨胀波纹管截面形状的设计理论,系统地阐述了膨胀波纹管截面设计的相关步骤和细节,设计出了6种花形不同尺寸的膨胀波纹管截面设计图。在此基础上,利用ANSYS14.0数值模拟软件对不同的设计截面进行了对比分析,得出了膨胀波纹管选择的3条原则:六瓣梅花形是最佳截面形式;设计截面的波峰和波谷的半径、弧度应尽量接近;在满足护壁压力要求的情况,壁厚应尽量的小。 相似文献
3.
4.
可膨胀波纹管技术是通过对圆形管材进行特殊工艺处理,使管径发生变形以便其顺利通过井孔到达问题地层,然后通过液压膨胀复原,达到修井固井的目的。经过多年的技术发展,此技术已在石油工程中得到很多实践应用,但是在口径相对较小的地质勘探孔中,由于受口径以及工艺技术等限制,尚未有相关应用。主要针对材料编号为KP02的φ75 mm小口径梅花状可膨胀波纹管进行研究,通过利用ANSYS有限元软件进行模拟以及实验室实验,得到其膨胀变形参数并对其膨胀过程进行对比分析。 相似文献
5.
6.
7.
8.
针对红山窑膨胀红砂岩具有微膨胀、易软化、易风化的特点,采用扫描电子显微镜、X射线衍射仪、MTS815.03岩石力学刚性电液伺服试验机等先进的设备为测试手段,对3种不同风化程度的膨胀红砂岩湿化过程进行观察和机理分析,从试验和机理两方面探讨膨胀红砂岩的湿化性,从而进一步阐明红砂岩膨胀性、裂隙化具有本质的区别。试验结果表明:(1) 中风化红砂岩干燥时抗压强度为5.85 MPa,饱和试样为0.20 MPa,岩石本身强度随吸水率增加而明显下降,具有强烈的软化作用;(2) 膨胀红砂岩的湿化性随胶结系数的减小而愈加强烈,与红砂岩风化程度(埋深)无关。这些研究成果对红山窑水利枢纽工程红砂岩地基开挖易裂以及边坡表层溜坍预治具有较大的指导意义。 相似文献
9.
李家窑膨胀岩膨胀性能的试验研究 总被引:5,自引:2,他引:3
对山西万家寨引黄工程南干线某地的膨胀岩进行了室内物理化学性质测试、常规的膨胀率与膨胀力及非常规的三向膨胀与大比例尺膨胀试验,分析结果后得出了相应的结论 相似文献
10.
11.
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
12.
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
13.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozach 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
14.
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
15.
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
16.
17.
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
18.
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
19.
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
20.
正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献