Maximum drilling diameter 16mm?
最大钻孔直径16mm ？
The effect and accuracy of using the apparent resistivity logging curve to identify permafrost and its influencing factors, such as soil properties, ice content and drilling diameter are discussed.
初步探讨了利用视电阻率电位测井曲线，划分多年冻结层的效果及精度与冻结层岩性、含冰量和井径等因素的关系。
They create a series of pores ranging from 5 to 25 nm in diameter by placing flakes of graphene over a silicon nitride membrane and drilling nanosized holes in the graphene using an electron beam.
通过将石墨烯薄片放置在一个氮化硅薄膜上，并用电子束在石墨烯上打出纳米尺度的孔，他们制作出了一系列从5到25nm直径的孔。
Drilling, it is necessary to advance 1.5 times the diameter of the screw, the screw too tight will cause stress.
有必要事前钻孔，1.5倍于螺钉的直径，而螺钉过紧会引起压力。
The theoretical and technical problems to be researched for large diameter drilling are outlined with its application prospect appraised.
简述了大直径钻井需要研究的理论和技术问题，并对应用前景作了评价。
Based on the historical experience of drilling technology, it is proposed to study the bottom process of large diameter reverse circulation rotary drilling.
根据钻探技术的历史经验，建议应进行大直径反循环回转钻进井底过程的研究。
In general drilling, axes decline and diameter enlarged of the hole are the main problems to affect the precision of machine tooling.
麻花钻普通钻削中，孔轴线的偏斜和孔径的扩大是影响其加工精度的主要问题。
The difference between large diameter drilling and oil drilling is reviewed with their characteristics.
论述了大直径钻井工程与石油钻井的不同特点。
According to the relation between the temperature and the ratio of the diameter of the defrosting zone to that of the drilling bit, the volume of washing fluid is optimized.
依据不同冲洗液温度时融化区直径与钻头直径比和冲洗液用量的关系，讨论了冲洗液用量的优化。
The paper introduced the use of airlifting reverse circulation rotary drilling techniques in practice of major diameter socket pile operation at Xiangfan city's Hanjiang No.
介绍了使用泥浆护壁气举反循环回转钻进工艺进行襄樊汉江四桥大口径嵌岩桩的施工实践。
Therefore, we can reduce the effect of frictional loss in the wellbore by drilling well with larger diameter or producing with small production rate.
因此，可以通过钻较大直径的井眼或控制井以小产量生产来减小井筒压降损失的影响。
Combined with a project example of a big diameter drilling pole pile, the load-settlement curve and load transfering law of pile and soil FEM are analyzed.
结合某大直径钻孔灌注桩工程实例，分析了桩土模型的荷载-沉降曲线及荷载的传递规律。
Based on analyzing the demands of small-diameter deep-hole drill for vibration drilling, a new inner-chip removal drill was designed.
分析了小直径深孔振动钻削对钻头的要求；设计了一种新型内排屑深孔钻头；分析了该钻头的结构和刃磨特点，进行了振动钻削试验。
The paper introduced the use of airlifting reverse circulation rotary drilling techniques in practice of major diameter socket pile operation at Xiangfan city's Hanjiang No. 4 bridge site.
介绍了使用泥浆护壁气举反循环回转钻进工艺进行襄樊汉江四桥大口径嵌岩桩的施工实践。
In this paper the relation between the hole diameter and the pile thickness of the jet on the hole bottom for a jet penetrating or drilling process is theoretically examined.
本文在理论上探讨了射流在侵彻或钻孔过程中，孔径和射流在孔底的堆积厚度之间的关系。
So it is novel tool for drilling of large diameter spiral.
从而，为大口径螺旋钻施工提供了一种新型钻具。
It's difficult to sidetrack in the deep well in salt bed, especially the creeping of the gypsum-salt bed, hole diameter reduction and collapsion etc. are the biggest barriers for sidetrack drilling.
在深井盐层中进行侧钻困难较大，膏盐层的蠕动、缩径、垮塌等不稳定性是侧钻的最大障碍。
The article describes how DF concept is used in the design of pressure feeders in small-diameter deep-hole drilling process.
介绍如何应用DF 系统原理设计小直径深孔加工中吸压送水器的问题。
A positive displacement variable diameter stabilizer was developed in China, and its field tests and real drilling applications in Well QHD32 6 A26 was presented.
并介绍了国内自行研制的正排量变径稳定器在QHD 32 -6 - A 2 6井的现场试验和实钻应用情况。
The effect is not apparently when using methods of large-diameter barrels, cementation and so forth during branching drilling in Cenozoic loose beds.
采用粗径岩心管、水泥封闭等方法在新生界松散层中人为叉孔有时效果不太明显。
Mine used small-diameter pilot drilling, then gradually reaming the borehole and finally completed to designed size.
宣东二号矿布设施工的大口径瓦斯抽放井以小口径导向钻进，后逐级扩孔成井。
To raise wire-line drilling efficiency need to: 1. Select casing diameter and depth according to drilling depth, diameter, strata drilled and rock integrity, structure features, weathered layer depth;
提高绳索取心钻进效率要做到：一是根据孔深、钻孔孔径、钻孔所遇地层及其岩性的完整程度、构造特点、风化带发育深度等选择套管的直径及下入深度；
The entering-rock problem of pouring pile through large-diameter hole drilling is always the biggest difficult problem in the fundamental construction of Guangxi.
大口径钻孔灌注桩的入岩问题，历来是广西基础施工中的一大难题。
The large-diameter gas drainage well laid out in the Xuandong No. 2 Mine used small-diameter pilot drilling, then gradually reaming the borehole and finally completed to designed size.
宣东二号矿布设施工的大口径瓦斯抽放井以小口径导向钻进，后逐级扩孔成井。
The test for laser drilling of Si3N4 ceramics by CW CO2 laser processing system is reported. The result shows that the proportion of depth to diameter is 18.75.
报导用连续波CO2激光加工机对氮化硅陶瓷的激光打孔试验，获得了深径比达18.75的结果。
The test for laser drilling of Si3N4 ceramics by CW CO2 laser processing system is reported. The result shows that the proportion of depth to diameter is 18.75.
报导用连续波CO2激光加工机对氮化硅陶瓷的激光打孔试验，获得了深径比达18.75的结果。
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