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Determination of the cleat angle distribution of the RECOPOL coal seams, using CT-scans and image analysis on drilling cuttings and coal blocks 总被引：1，自引：1，他引：0
Karl-Heinz A.A. Wolf Frank van Bergen Rudy Ephraim Henk Pagnier 《International Journal of Coal Geology》2008,73(3-4):259-272
Cleat orientation, cleat frequency and cleat angle distribution of deep coal seams are only available by the use of drilling cores and from coal mine samples. Coal drilling cuttings are a cheap and fast alternative to measure cleat angle distributions with the use of image analysis techniques. In this study oriented coal samples and drilling cuttings of the RECOPOL field experiment are compared and used to explain and validate the proposed method. In other words, cleat angle distributions from drilling cuttings are measured by image analysis. The geological framework of the polish coals is described. The image analysis methodologies for the measurement of fracture faces of cuttings and from CT-scan images, derived from these coals, are explained. The results of the methods on the cuttings are compared with cleat orientation distributions from CT-scans and artificial fragments from coal blocks of the same seams. These evaluations show high agreements between the methods. The cleat angle distributions of drilling cuttings of four seams are compared with the cleat orientation distributions of a regional structural geological study. The high correlation in this study shows that cleat angle distributions of coal seams can be used as input parameters for reservoir modelling. 相似文献
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水井钻探岩屑地质编录方法探讨 总被引：2，自引：0，他引：2
本文介绍了当前地质钻探技术规范对水井钻探岩屑地质编录要求,分析了岩屑地质编录对水井钻探和基础地质及城市地质研究的重要性。论述了"岩屑实物剖面法"录井方法的优点、程序以及应用,"岩屑实物剖面法"录井方法对水井钻探项目,具有一定的借鉴和推广意义。 相似文献
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用三维激光成像技术调查高陡边坡岩体结构 总被引：3，自引：0，他引：3
论文针对“罗盘 皮尺”传统模式调查高陡边坡岩体结构中的缺点,提出了三维激光成像技术调查高陡边坡岩体结构的新方法。利用三维激光成像技术可获得完全实景的数字模型,并在该数字模型上可直接量取点、线、面和三维实体空间坐标,从而进行结构面产状、迹长与连通率、间距等岩体结构特征参数计算和地质剖面切图。最后,以营盘山陡崖边坡为例,详细阐述了三维激光成像技术调查高陡边坡岩体结构特征参数方法及过程。结果表明,利用三维激光成像技术所得的结构面产状、间距等岩体结构特征参数要优于传统的“罗盘 皮尺”量测结果。因此,三维激光成像技术的引入,必将引发岩体结构特征参数测试技术革新性的发展。 相似文献
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针对无岩心水井钻探地层时代划分的困难, 通过对北京市平原区寒武系和奥陶系层型剖面标志特征的分析, 识别了岩石地层单位的分层标志特征;介绍了钻井岩屑地质编录的基本技术要求;分析了岩石地层单位地球物理测井的物性标志特征。阐明, 通过岩屑地质编录结合物探测井能够较好地对平原区钻井进行地层时代划分。 相似文献
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研究区地球化学景观属于甘肃北山干旱荒漠戈壁残山区,通过1∶2.5万水系沉积物测量在北山盐池黑山一带圈定多处金弱异常。为突出成矿及指示元素的地球化学异常特征,提高找矿效果,优选水系沉积物测量金弱异常,开展1∶1万岩屑测量,利用相关性及R型聚类分析对元素组合特征进行分析、归纳,并圈定单元素异常和综合异常。对成矿前景较好的2处综合异常,采用踏勘追索、大比例尺地质填图及探槽等手段进行查证,发现了盐池黑山南金矿,实现了在水系沉积物弱异常区的找矿突破,研究成果充分证实岩屑测量在甘肃北山干旱荒漠戈壁残山区进行地质找矿的有效性,为北山水系沉积物测量弱异常区找矿提供了新的途径。 相似文献
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The thermal conductivity of a geological formation is one of the important petrophysical parameters which are preferable to study in situ in geophysical well logs. A new technique for the determination of formation thermal conductivity has been developed. We assumed that formation dry density, porosity, and pore fluids saturations could be determined from core samples or cuttings. In this case the specific heat and density of a formation can be quantitatively estimated. It is also assumed that the instantaneous heat flow rate and time data are available for a cylindrical probe with a variable heat flow rate placed in a wellbore. A semi-theoretical equation describing the temperature of the probe’s wall is used to determine in situ the formation conductivity as a function of the temperature increase. The formation thermal diffusivity is also calculated. A field example is presented. 相似文献
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D03地热勘探井部署在雄安新区雄县牛驼镇凸起的轴部,设计井深2500 m,完钻井深2511.10 m。实施的目的是为探明蓟县系碳酸盐岩热储的地质结构和分布,获取碳酸盐岩热储地热—水文地质参数,计算地热资源潜力。本文主要介绍了D03地热勘探井的钻探施工情况,开展了螺杆马达单点定向顶漏侧钻绕障作业,解决了失返性漏失段定向侧钻难题,探索了失返性漏失段水泥固井工艺,获取了标志层杨庄组的岩屑和岩心,区分开了雾迷山组白云岩和高于庄组白云岩,实现了勘探的目的。通过钻探施工、取心、岩屑录井、薄片鉴定等工作,基本查明了D03井区的地质结构及主要岩性特征。通过抽水试验,获取了水文地质参数,评价了可开采资源量。 相似文献
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针对大庆油田深层致密气埋藏深,储层砾岩、火山岩裂缝发育,水敏性强,钻井过程中易发生漏失、垮塌、缩径及高温钻井液性能变差等复杂,且深层水平井钻进会带来摩阻、携岩和储层污染及使用油基钻井液存在成本高、后期环保压力大等难题,在分析总结前人研究成果及经验基础上,从致密气藏地质特征及深层水平井钻井难点出发,明确了钻井液技术对策,通过开展聚胺和聚醚多元醇“双聚”抑制、封堵防塌剂的研究,配合自主研制的新型高效随钻封堵材料,研发出一套适合于深层致密气藏水平井施工的双聚胺基钻井液技术。室内研究及现场应用表明,该钻井液具有较强的封堵防塌、井眼清洁和润滑防卡能力,抗温达180 ℃以上,有效地解决了深层水平井漏失、垮塌、携屑、润滑问题和储层保护问题,保证了深层水平井的顺利施工,创造了大庆油田深层水平井钻井周期最短（109 d）,井深最深（5048 m）,水平段最长（969.22 m）,井底温度最高(180 ℃)等几项新纪录,完全满足了徐家围子地区深层致密气藏的钻探需求,为深层水平井安全、快速、高效钻井提供了技术保障。 相似文献
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针对辽东湾某区块大斜度井出现的钻井液粘切高、起下钻困难、钻井液流变性不易控制的问题,从清理岩屑床入手,提出通过改善泥饼质量,保证井眼光滑、井壁稳定和保证钻屑携带的基础上,改变钻井液的流变性,使钻井液在钻铤处达到紊流,并及时使钻屑均匀分散在钻井液中,减少形成岩屑床的机会,达到清理岩屑床目的的新方法。该技术在该区块8口水垂比小于2的井上进行了施工,取得了理想的效果。 相似文献
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水平螺旋钻进钻杆排粉机理实验 总被引：1，自引：0，他引：1
为了研究松软煤层螺旋钻进钻杆排粉机理,用相似模型实验研究螺旋钻杆的排粉,宏观了解煤粉颗粒在螺旋钻杆作用下的运动形式,从理论上求解其运移的速度,并通过实验验证螺旋钻杆动力参数和结构参数对其排粉量的影响。实验显示:螺旋钻杆外径参数、转速和钻进速度等动力参数相同的情况下,螺距和心杆尺寸的大小对钻杆的排粉量影响很大;不同的螺旋钻杆其转速适合,螺旋钻杆才能很好的排粉。 相似文献
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HOU Guiting QIAN Xianglin WANG Shuyuan SUN Jing Department of Geology Peking University Beijing 《《地质学报》英文版》2000,74(2):391-393
The ultra-long electromagnetic wave remote sensing technique developed by Peking University is one of new future techniques, which can detect the submarine geological information from the depth of 20 to 10000 m below the surface by receiving natural ultra-long electromagnetic waves (n Hz to n 100 Hz). The new remote sensor is composed of three parts: a main instrument with a portable computer, an antenna with an amplifier and an external power.The new remote sensing technique is characterized by good stability and reproducibility at the same spot but at different times and high sensitivity and high signal-to-noise ratio, and can reveal geological and lithologic boundaries as well as strata and related mineral sources. Two years of marine geological experiments on this technique have indicated that it can solve many problems in marine geological exploration, e.g. the burial depths of sea-floor mud, Quaternary sediments and submarine structures. This technique can be applied to detecting the sea bed depth 相似文献
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N. I. Fisher J. F. Huntington D. R. Jackett M. E. Willcox J. W. Creasey 《Mathematical Geology》1985,17(2):177-194
A frequently encountered problem in structural geology is the analysis and interpretation of directional data with a geographical distribution. Such data may arise, for example, as samples of fracture strikes collected at a number of locations (rocky outcrops, road cuttings, etc.), trends of geological structures mapped in underground mines where they are exposed in the tunnel roof, or as lineaments annotated on aerial or satellite photographs. From such data, it is of interest to determine the structural domains in the area, that is, to partition the area into subareas of homogeneous structural pattern. This paper presents a method for performing such an analysis, and applies it to a data set collected from an underground coal mine. 相似文献
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洗孔是钻探工程中的重要环节。冲洗介质在孔内进行循环,可以达到清洗孔底、携带和悬浮岩屑、冷却钻头和保护孔壁的目的。不同的洗孔工艺可以产生不同的复杂情况。冲洗液孔底反循环,由于冲洗液是反向循环,与岩心进入岩心管的方向一致,因此可以提高在裂隙、破碎、性脆、软硬不均等复杂地层钻进时采取岩心的数量和质量。俄罗斯莫斯科国立地质勘探大学KULIKOV V.V.博士等人在洗孔方面做了很多的研究工作,提出了钻孔钻进时洗孔复杂情况的分类,对地质钻探中常用的无泵钻具钻进、喷射式钻具钻进和气举钻具钻进时的洗井工艺问题进行了分析与讨论,提出了相应的建议。 相似文献
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为解决旋挖钻机在硬岩地层中施工困难的问题,借鉴地质钻探领域成熟的工艺方法,研制了适用于旋挖钻机用的空气潜孔锤反循环钻进工艺方法及设备。该工艺方法在不改变旋挖钻机任何结构的情况下,配套空气潜孔锤反循环钻具即可实现硬岩的快速钻进,解决了大口径钻探排渣困难的难题,且能够达到环保的要求。气动潜孔锤反循环钻具的设计全面考虑了大口径桩基施工及潜孔锤应用特点,气水龙头的双通道、大通孔设计满足进气排渣要求,反循环双壁钻杆为同心式,密封可靠,钻具的连接采用六方快速连接。通过在厦门地铁施工试验,验证了其可行性。 相似文献
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For horizontal directional drilling crossing project, pumping pressure is a key factor that influences the drilling efficiency and the stability of borehole wall. There are nevertheless many theoretical difficulties in calculating and analyzing the dynamic law of pumping pressure. This paper aims to resolve these problems based on construction features and rheological theory. The power-law fluid model is adopted to describe rheological properties of drilling fluid. In order to prevent blowout from occurring in the drilling process, the maximum allowable mud pressure at different reaming stages is calculated by numerical method under condition of complicated geological structure. The borehole pressure must be greater than minimum required mud pressure which is achieved by hydrodynamic calculation method, only meet this condition can it transport the cuttings to the ground surface. Moreover, the pressure loss in the drill string, including loss in drill rod and loss through bit nozzles, is also calculated by newly derived equations. Finally, combining with practical engineering field data, the appropriate range of pumping pressure at different reaming stages is obtained through the calculation results of three types of pressure, which can help engineers minimize the occurrence of accidents and enhance the drilling efficiency. 相似文献
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山区高速公路路堑高边坡稳定性分析评价 总被引：4，自引：0，他引：4
山区地形地质条件复杂,深路堑高边坡多,切坡引发工程滑坡对公路工程的安全稳定影响巨大。结合铜汤路工程实践,阐述山区高速公路高边坡稳定性勘察评价方法,并建议采取综合防护措施,特别是以植物防护为主,结合工程防护的设计理念,确保边坡安全稳定,还大大改善了山区公路景观。 相似文献