In the event failures of boring tools, the fatigue failure of the drill collar is especially prominent.
在钻具失效事故中，钻铤的疲劳失效尤为突出。
As such, magnetic particle inspection for the screw thread of the drill collar is very necessary and important.
因而钻铤内外螺纹的磁粉检测十分必要和重要。
A log similar to a dual induction log but made by an electromagnetic propagation tool built into a drill collar.
与双感应测井类似的一种测井方法，用安装在钻铤中的电磁传播仪进行测量。
When picking up or setting down drill collar stands larger than 6 1/4" on the floor board, always snub with the air tugger."
当在钻杆盒上提起或放置直径大于6 1／4〞的钻铤立柱时，一定要用气动绞车拉住以保安全。
Fit the rig tongs with the correct jaws for the drill pipe tool joint or the drill collar. Re-install the safety lock springs.
给大钳装上与钻杆接头或钻铤相匹配的钳头，再装上安全锁簧。
Do not make up or break out the bit on a single joint of DC. If this is absolutely necessary, always snub drill collar with the air tugger.
不要在一单根钻铤上卸钻头，如果确实需要这样做，要用气动绞车拉住钻铤。
Because its rigidity are less than the drill collar, less contact area with wall of a well, is also not easy to form differential pressure sticking.
由于其刚性比钻铤少，和井壁接触面积小，也不容易形成压差卡钻。
After processing LET thread, stress groove and double shoulder connection for the NC35 thread of Drill Collar in 43/4 inch, torsion tests were done.
4英寸）钻铤NC35螺纹加工LE螺纹、应力槽、双台肩后进行了实物抗扭性能试验，证实双台肩钻铤具有很好的抗扭性能。
The correct countermeasures are taken to prevent the drill collar screw failure effectively, ensuring the qualitative reliability of drill collar screw.
通过采用合适的对策，有效预防钻铤螺纹失效，从而保证钻铤螺纹的质量可靠性。
The downhole stabilizer location adjuster, fixed between the bit and the drill collar, is a special tool for continual deviation control of a slant hole.
井下稳定器安放位置调节器是斜井旋转钻井时实施井斜连续控制的专用工具，安装在钻头与钻铤之间。
Take pin threads of NC50 drill collar as an example, Finite Element Method is used to analyze the different stress-relief grooves of pin thread connection.
以NC50型钻铤公螺纹作为研究对象，用有限元方法对加工有不同应力减轻槽的钻铤公螺纹接头进行了分析计算。
In this paper, the effects of chemical composition of the steel for oil drill collar on its properties were studied and the heat treatment process were optimized.
研究了石油钻铤用钢的化学成分及其对性能的影响，并优化了热处理工艺。
By taking advantage of rotating centrifugal force and the supporting effect of eccentric short drill collar, we cut off the axis inclination of bit, and avoid well inclination.
利用偏心钻具在旋转过程中的离心力和偏心短钻铤的偏重带的支撑作用，减小了钻头轴线倾角，从而减少了井斜。
The fatigue failure of drilling collar thread linking is a main factor of the drill collar failure, which accounts for a large proportion of the accidents in the drilling tool failure.
钻铤螺纹联结失效是钻铤失效的主要因素，在整个钻具失效事故中占很大比例。
John Loring tried a coarse drill jacket of stand-up collar in Chinese tunic suit style. Match with other more traditional clothes he dresses it appear an amazing effect.
约翰•洛林 (JohnLoring) 试穿了一件中山装式样立领式粗斜纹棉布夹克，与他身上其它更加正统的服装搭配起来，看上去竟有种出奇效果。
Drill rod and collar are key apparatus in drilling exploration and well drilling industry.
钻杆和钻铤等管状螺纹联接件是钻探和石油钻井工业中的关键设备。
Drill rod and collar are key apparatus in drilling exploration and well drilling industry.
钻杆和钻铤等管状螺纹联接件是钻探和石油钻井工业中的关键设备。
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