您要查找的是不是：
- On the basis of an analysis of the location and causes of the failure of drill collar threaded connection, a high-strength drill collar threaded connection is developed. 在分析钻铤螺纹失效部位及原因的基础上，研制了高强度钻铤螺纹，它与普通钻铤螺纹相比，只是在外螺纹小端增加了一段光平的锥体。
- Application of finite element method in the structure optimization of drill collar thread 有限元法在钻铤螺纹结构优化中的应用
- drill collar thread 钻铤螺纹
- Research on a new stress relief groove of drill collar threaded connections 新型石油钻铤联接螺纹减应力区的研究
- We need a short drill collar to put here. 这里要接一根短钻铤。
- Ultrasonic Testing of Drill Collar Threads by Small Angle Incidented Longitudinal Waves 钻铤丝扣的小角度超声纵波检测
- This is the dope for drill pipe thread. It can't be used for drill collar. 这是钻杆丝扣油,不能用在钻铤丝扣上。
- The spiral drill collars are being tried to use. 螺旋钻链正在试用。
- Connect the feeling plate to the drill collars. 用钻铤连接探深板。
- On this basis,a new kind of unbending drill collar tool has been designed,which is probably to be a new kind of inclination preventive tool. 为此，设计了一种压不弯钻铤装置，此装置有可能成为防斜打直的一种全新的井下钻具。
- The main products are:Slick Drill Collar,Spiral Drill Collar,Nonmagnetic Drill Collar,Heavy Weight Drill Pipe,square and hexagonal Kelly. 并可承接特殊规格的石油钻具产品的生产。
- 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。
- 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。
- The drill pipe and drill collar of TZ3080/55 roughneck are designed modularized, effective and safe from 31/2" to 81/2" with light weight, small volume. TZ3080/55铁钻工重量轻，体积小，模块化 的设计安全有效，适用于从31/2"到81/2"内的钻杆 或钻铤上卸扣。
- They measured the length of drill collars yesterday. 他们昨天仗量了钻杆和钻链的长度。
- Collar threads, plunger threads and base mounting holes enable easy fixturing(on most models). 大多数千斤顶颈部、活塞杆有丝牙，底部有孔，便于安装。
- We need a short drill collar. 需要一根短钻铤。
- The fur collar mats when it gets wet. 皮领子湿了时毛就结在一起。
- Spiral drill collars made in our plant are in accordance with API standard. 本厂制造的螺旋钻铤按照“API”标准生产和验收。
- Using ultrasonic to inspect endurance crack in collar thread 钻铤螺纹疲劳裂纹的超声波检测
