Conventional double tube bits should be used as bits for drilling, while coringtool is double tube.
当取心钻具采用双层管时，钻进所用的钻头就需要用普通双管钻头。
2
This paper mainly introduced the casing program of the coalbed gas well, drilling parameter, coringtool and technologies and so on.
文中主要介绍了煤层气井的井身结构、钻井参数、取心工具和工艺等。
3
Glass steel coringtool is specifically developed for improving the core recovery of conglomeratic weak formation and the core integrality in Liaohe Oilfield.