The initial gushing of oil out of a drill pipe is caused by the pressure of the gas trapped and compressed immediately above the oil deposits . 最初石油喷出钻管,是由于受到紧压在石油层上的被密封的气体的压力。
Diamond drill and diamond blades for construction industry 工程用钻石钻管切片
Field inspection of new casing , tubing , and plain - end drill pipe , 7th edition 新套管管道和平端钻管的现场检验.第7版
3 . thin - wall drill pipe 3 .薄壁钻管
Petroleum and natural gas industries - field inspection of new casing , tubing and plain end drill pipe 石油和天燃气工业.新套管管和平端钻管的现场检验