The technique is to use the 89-mm-wider socket tubes as drilling rods and make holes by the single-action twin-pipe drilling tools, which can ensure the perpendicularity of boreholes and the percentage recovery of concrete cores in the construction of bridge piers.
介绍了福宁高速公路部分高架桥跨海大桥桩基钻探取芯检测施工工艺 ,研究采用了 89mm套管作钻杆 ,单动双管钻具钻进 ,从而保证了钻孔垂直度及砼芯采取率的较高质量要求。
Application of Core Drilling Collecting Rate to Evaluate Seam Gas Content and Distribution
应用钻探岩芯采取率评价煤层瓦斯含量及分布
A Brief Talk on Some Measures to Raise Core Recovery in Engineering Geological Exploration
浅谈提高工勘中岩心采取率的几点措施
Two methods are used to evaluate the permeability of cores.
有两种方法可用来测量岩芯的渗透率。
Study on drill bit for large diameter core drilling of deep hole in hard rock
硬岩深孔大口径取芯钻进的钻头研究
After pretreating corn cob with boiled water, the extraction rate could rise to 33.01%.
玉米芯经过水煮后,木聚糖提取率为33.01%。
Construction Method of Coring for Pore Forming Based on Water Drilling of Super-diameter Rock Pile
超大直径岩石桩水钻取芯成孔的施工技术
Experimental Research on the Seismic Behavior of Reinforced Concrete Beam-column Joints Constructed with Beam Concrete by Improved Measures;
采取改进措施的夹芯节点抗震性能试验研究
A Study on Mechanism of Enhanced Oil Recovery by Combinational Flooding in Conglomerate Reservoir
砾岩油藏复合驱提高采收率机理研究
German scientists discovered small pieces of copper in core samples,
德国科学家在所采得的岩芯样品中，发现了一些小铜片，
Effective permeability's are normally measured directly in the laboratory on small core samples.
有效渗透率一般是在实验室中对小体积岩芯样品直接测量得出的。
High Resolution Records of Paleoenvironment in Deep Sea Core -Taking the Core 17940-2 from Northern Slope of the South China Sea as an Example
深海岩芯高分辨率的古环境记录—以南海北部陆坡17940-2柱状样为例
Core flow experiment showed that plugging rate of lost circulation material was over 97 % .
人造岩芯封堵实验表明,该堵漏剂封堵率达97%以上;
EOR Technology Research on Unconsolidated Sand Heavy Oil Reservoir of Yong 8 Block;
永8疏松砂岩稠油油藏提高采收率技术研究
Research on the Mechanism of Varying Reservoirwettability to Enhance Oil Recovery;
岩石混合润湿条件下提高采收率机理研究
Research on the Mechanism of Varying Reservoir Wettability to Enhance Oil Recovery;
改变岩石润湿性提高原油采收率机理研究
Study on Mechanism of Polymer Flooding in Conglomerate Reservoir;
砾岩油藏聚合物驱提高采收率机理研究
On enhancing recovery of viscous oil sandstone reservoirs through polymer flooding;
用聚合物驱油提高稠油砂岩油藏采收率
Adopting a Number of Effective Measures to Increase Coal Resources Recovery Rate;
采取各项有效措施 努力提高煤炭资源回采率