只有在必要时才进行起下钻。这句话正确的英文翻译是：Up and down trips are made only if they are necessary.

When a well is drilled off to one side it is called a “...

判断题When a well is drilled off to one side it is called a “directional well”.这句话的中文意思是：当一口井朝一个方向钻井时，就叫定向井。

内平扣的英文及缩写Regular=REG。

判断题内平扣的英文及缩写Regular=REG。

防喷器的英文表述：BOP-Blow Out Preventer。

判断题防喷器的英文表述：BOP-Blow Out Preventer。