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煤层低压、易塌、易漏造成煤层段井眼不规则,扩径严重,使注水泥过程顶替效率降低,影响水泥浆的封固效果。运用CFD数值模拟方法,结合鹤岗煤层气井测井数据,模拟了煤层段不同扩径长度、扩径率、井斜角、套管居中度、水泥浆流变参数及顶替流态下的体积顶替效率及截面顶替效率值;分析了各因素对顶替效率的影响规律。结果表明,扩径段长度增加,顶替效率提高;扩径率、井斜角及偏心度增加,顶替效率降低;宾汉流体及幂率流体均存在顶替效率最高的流变参数值,顶替流态建议采用塞流顶替。研究成果为煤层气井安全优质固井提供了技术指导。 相似文献
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水平井分段压裂技术已在低渗透油气藏及煤层气开发过程中得到了较为广泛的应用,并取得了良好的经济效果。但是,由于分段压裂会使直井段的套管承受交变应力作用,进而造成其在软硬交错地层处发生严重变形,从而影响压裂安全作业,甚至引发所有剩余压裂段报废。为探索其破坏机理,开发一个类似弹簧单元的用户子程序来模拟循环荷载作用下套管-水泥环界面的受力情况,并将该单元植入到套管-水泥环-岩层系统的ABAQUS轴对称有限元模型中,模拟水平井分段压裂过程中套管的力学行为。结果表明,在软硬交错地层中,采用水平井分段压裂时,注入压力与地应力之间的交变应力差会造成套管的大变形。此外,基于ABAQUS的数值模拟结果,采用FE-safe评估套管疲劳寿命,发现处于软硬交错地层处套管的疲劳寿命最短。基于上述研究,建议在具有软硬交错地层的低渗透油藏及煤层气储层中进行分段压裂时,应设法提高非压裂阶段压力,以减轻交变应力对软硬交错地层处的套管损伤。 相似文献
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为提高红河油田水平井固井质量,满足后期分段压裂需求,对红河油田水平井固井技术进行了研究。针对红河油田水平段固井技术难点,通过室内和现场试验,优选出了GSJ水泥浆体系,基于实测地层压力与地层破裂压力,进行平衡压力固井设计确定了环空浆体结构,为提高顶替效率,优化了扶正器类型与加放位置,专业软件模拟表明套管居中度＞73%,良好的井眼准备和套管漂浮措施确保了管柱的顺利下入;加长胶塞、树脂滚轮刚性旋流扶正器和关井阀等附件的使用,保证了固井质量。现场应用53口水平井,水泥浆全部返至地面,CBL测井结果表明,固井优良率达81.13%。该固井技术成功应用于红河油田水平井中,保证了固井质量,满足了后期分段压裂的需要。 相似文献
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ADM6-4H井是AHDEB油田使用常规随钻测量仪器（MWD）和螺杆动力钻具组合完成的一口水平段长度1500 m、最大水平位移1915.17 m的6 in小井眼大位移水平井,也是AHDEB油田目前水平位移最大的一口水平井。该井四开水平段钻进使用聚磺混油钻井液体系,在携砂、井眼稳定和润滑减阻等方面效果突出。四开水平段钻速快,钻进扭矩小,钻井液性能稳定,无井壁失稳,无漏失,无卡钻,无托压,其经验技术值得借鉴。 相似文献
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分析了目前延长油田西部区域固井现状及造成固井质量差的原因,据此提出了适合延长油田西部地区水平井固井水泥浆性能的要求,优选出了适合该地区水平井固井的水泥浆体系。该水泥浆体系具有低滤失、零自由液、高沉降稳定性、好流变性,有利于提高浆液顶替效率。形成的水泥石具有不收缩、微膨胀、早强的特点,满足水平井射孔、后期压裂改造等工程施工的要求。最终形成了一整套适合延长油田西部地区水平井固井的水泥浆体系。 相似文献
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南堡32-3646井是一口四开三段制定向井,设计井深5798 m。3864～4265 m（井斜29.18°的稳斜段）试验了五刀翼旋流喷嘴PDC钻头（主切削齿直径16 mm, 3个φ11 mm常规水眼和4个φ18 mm旋流喷射水眼）。针对深井超深井钻进中常采用的相对较高的钻井液密度和粘度,不利于提高钻头破岩效率的问题,在系统介绍旋转射流发生机理和破岩机理的基础上,对NP32-3646井五刀翼旋流喷嘴PDC钻头现场应用情况进行了分析。试验结果表明,旋转射流因具有切向、轴向和径向三维速度,可在高粘钻井液条件下更好地改善井底清岩效果,并通过剪切、冲蚀、拉伸和磨削等多种方式实现辅助破岩,从而提高钻井效率。试验钻头进尺401 m,平均机械钻速4.45 m/h,可较好地满足现场钻进需要,具有良好的推广应用前景。 相似文献
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岩（矿）心采取率低是单管取心钻进的主要问题。在钻进时由于冲洗液对岩心的冲刷作用,使岩（矿）心中的矿物颗粒不断被冲洗液带走,造成岩心缺失、岩心采取率过低。从钻具内部流速分布、冲洗液冲刷作用、岩心采取率、冲洗液携粉等角度出发,分析了单管钻进时造成岩心采取率过低的原因,采取分流、降速等方法,设计了一套可以在一定程度上提高岩心采取率的分水单管钻具,通过数值模拟,证明了该钻具在满足及时清除孔底岩粉的条件下,能使单管钻具中岩心周围冲洗液流速降低25%左右,进而解决常规单管钻进岩心采取率不足等问题。 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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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
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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
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正20141768 An Shaopeng(Institute of Rock and Soil Mechannics,Chinese Academy of Sciences,Wuhan 430071,China);Wei Lide Experimental Study on Mechanical Behavior of Xigeda Formation Siltstone and Structure Interface(Journal of Engineering Geology,ISSN1004-9665,CN11-3249/P,21(5),2013,p.702-708,9illus.,1 table,16 refs.) 相似文献