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The paper discussed the main technical points of bedrock drilling, the design and selection of back reamers for different formations and drilling diameters, detailed construction technology of bedrock with typical engineering cases in China and prospected the future development.

论述了非开挖基岩钻进的技术要点及在不同地层、不同管径施工条件下对非开挖回扩钻头的设计及选用。结合国内几个典型的施工实例，详细阐述了非开挖基岩钻进的施工工艺。展望了该技术的发展前景。

More accurate crystallographic parameters and improved mathematical model were used in simulating the formations of 3D plate-shaped or 2D lenticular-shaped Ni4Ti3 variants.

与二维模型相比，本研究采用了准确的晶体学参数及改进的数学模型，获得了更为直观及合理的三维盘状变体及二维透镜状变体； Ni4Ti3沉淀相的长度、宽度和面积分数随时间的变化分别遵循指数、线性和对数关系；且其长度与宽度的比值并非恒定值，在生长初期该比值有较大的增速而随后逐渐减慢，能很好地解释沉淀相盘状及透镜状形貌特征形成的原因并与相关实验结果吻合。

Medium parabolic profile and heavy cutter density provide good penetration rates in medium to hard formations with medium compressive strength and small abrasive layers.

中等抛物线冠部和加密布齿使其在中等抗压强度并含一定研磨性的中至硬地层中获得好的钻速。

Medium parabolic profile and heavy cutter density provide good penetration rates in medium to hard formations with medium compressive strength and small abrasive layers.

中等抛物线冠部和加密布齿使其在中等抗压强度的中到硬地层以及薄研磨性夹层中能有良好的钻进速度。

Up in the mountains are clear lakes, quick-moving small rivers, and huge formations of rock.

山上是清澈的湖泊，快速流动的小溪和巨大的岩石构造。

Up in the mountains are clear lakes, quick-moving small rivers, and huge formations of rock. One huge rock is called Half Dome. It rises more than two thousand seven hundred meters into the air.

在山中，有清蓝的湖泊、有快速流动的小河流，还有巨大的岩石群，其中一个最大的岩石叫半圆丘，它高达2700米，直插云宵。

The paper introduces the technology of optimization design of wellbore proile, the casing window-opening technology, and the barefoot laterally drilling technology. In view of such problems as the poor wellbore stability of large hole, the easily collapsed "Shuangshi bed", the barefoot laterally drilling, the different depth of production formations, the frequent trajectory adjustment, the prediction of torque and drag, and window entry of branch wells, systematic reasonable technical measures are established.

介绍了该井井身剖面优化设计、套管开窗及裸眼侧钻等新技术，针对表层大井眼井壁稳定性差、&双石层&易垮塌、裸眼侧钻、气层深度不一、轨迹调整频繁、摩阻扭矩预测及分支井所面临窗口再入等一系列技术难题，制定了一整套合理的技术措施。

In addition,the stability of wildcat well is generally determined by experience,so the disaster at complex formations is unable to avoid.

此外，野猫井的井壁稳定性一般凭经验判断，所以复杂地层的井壁失稳事故在所难免。

Reservoir bed is distinguished by providing the information about resistivity of formations using Electromagnetic Propagated Resistivity Logging method with several mega-hertz operation frequency. The information of dielectric constant of invaded zone is provided using Ultrahigh-frequency Electromagnetic Wave Logging method with above 200 mega-hertz operation frequency, which has no enough radial investigation depth but has a good vertical resolution.

几兆赫兹电磁波传播电阻率测井通过提取地层电阻率的信息来判别油层，以SPPRRYSUN公司源频率为2MHz的EWR-3D测井仪为代表。200 MHz以上的超高频电磁波传播测井具有很高的垂向分辨率，但探测深度太浅，基本上只能反映侵入带介电常数的信息，SCHLUMBERGER公司已推出源频率为1 。1GHz的EPT测井仪。

Here we will see the four splendid miracles: Coral flowers, Stone flag (8 meters long), Stone shield (4 meters wide), Straw clusters, and as well some other unique Carst formations. Very significantly, all the stalactites and stalagmites in the cave are "as white as snow, and as pure as jade".

欣赏洞内的金银盾、去海盘龙、石旗之王、龙凤呈现、金銮宝殿、雪玉企鹅等神奇景点，洞内80％的钟乳石都＂洁白如雪，质纯似玉＂（游览时间约1.5个小时）。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。