A new welding process, the transient liquid phase (TLP) bonding, is applied to joint drill pipes in order to overcome the shortcomings of the friction welding.

针对石油鉆桿摩擦焊中存在的缺陷，研究了鉆桿瞬时液相扩散焊技术。

Full-scale fatigue test of drill pipe and borehole tests of drill pipes containing defects prove the reliability of assessment methods and software posed in this paper.

通过鉆桿全尺寸疲劳试验和含有缺陷鉆桿的井下试验，证明了本文提出的评价方法和软件是可靠的。

Based in Jiangsu province, the company makes casing, tubing and drill pipes for the oil - and natural-gas-exploration industry.

WSP总部位于江苏，主要生产油气勘探行业所用的套管、油管和鉆桿。

The taper tap can effect different fishing operations when equipped with RH thread or LH thread drill pipes and other tools.

公锥与正、反扣鉆桿及其他工具配合使用，可实现不同的打捞工艺。

The control that accidents and fractures of crack nucleation, propagation and washout in drill pipes are importance steps to keep drill pipes safe run.

鉆柱裂纹成核、扩展、刺漏等事故及断裂的控制是确保鉆桿在鉆井中运行安全的重要措施。

Variable bore ram-type blowout preventer, as an improved blowout preventer, is capable of sealing around drill pipes with a range of sizes and has advantages such as low cost and convenience.

可变径闸板防喷器作为新型的闸板防喷器，能够密封一定范围内多种规格的鉆具，具有成本低、使用方便等特点。

Test results show that such steel can be mass produced with technology of a large converter plus the secondary refining, which can insure drill pipes for the transverse impact toughness.

试验表明，采用合适的冶炼工艺，大型转炉加炉外精炼能够批量生产超低硫低磷鉆桿用钢，使鉆桿获得高横向沖击韧性。