replacement

Energy-saving pumping unit with replaceable power;

可更换动力的节能型抽油机

Therefore,a casing drilling system with retrievable bit driven by rotary table was developed.

采用常规钻机、利用转盘驱动的简易套管钻井技术由于受钻头寿命的限制,只能用于一只钻头钻至设计井深的情况,为此,研制开发了转盘驱动的可更换钻头套管钻井系统。