关键词: 深井, 大眼井钻井, 钻井速度, 钻井参数, 钻头, 钻井工艺, 研究

Abstract: Problems commonly presented in deep large diameter wellbore drilling have been analyzed systematically in this paper.It is pointed out that the essential drilling problem is the unsuitability of the drill pipe,drill collar,drill bit and drilling equipment for the needs of deep large diameter wellbore drilling.In soft formations,the main problems are the large hydraulic losses,low bydraulic horsepower,and poor bit cleaning conditions.In hard formations and gravel beds,the main problems are insufficient bit weight,unreasonable design of cutting structures of drill bits,and low rock breakage efficiency.To solve the problems,a series of technical steps are suggested in this paper.

Key words: deep well, large diameter wellbore drilling, drilling speed, drilling parameter, drill bit, drilling technology, study