反扣

反扣井眼轨迹控制及钻井工艺在渤海的应用

Application of the track control and drilling technology of lefthand well

他把书反扣在胸膛上，陷入了沉思。

He rested the book face downward on his breast and fell to thinking .

他们可以发球、扣球、拦网、反扣，都同样熟练。

They could serve and hit the ball , block it at the net or return it with equal facility .

公锥与正、反扣钻杆及其他工具配合使用，可实现不同的打捞工艺。

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

为了克服剪钉式和反扣式两种安全接头的不足，研制出一种滑套式井下安全接头。

To overcome the shortcomings of the shear pin type joint and left-hand thread type joint , a sliding sleeve subsurface safety joint is developed .

好现在我可以离开地面，稍稍上一点距离，检查一下所有的设置，安全带是不是反扣了，锁门是不是拧上了。

When leaving the ground , I can go a little way now , I am OK , and I check everything to make sure , my buckle is good , and this is lock .