关键词: 钻井, 井斜控制, 钟摆钻具, 满眼钻具, 动力钻具, 陡倾构造

Abstract: The hole deviation has many influencing factors during drilling process.Severe hole deviation in vertical wells often occurs during complex deep well drilling in China,especially in Yumen-Qingxi,Chaidamu Basin of Qinghai,east Sichuan province,mountain areas of Tarim oil field in recent years.In order to control hole deviation,some technologies such as eccentric-axis drilling assembly and downhole motor matched with PDC bit besides conventional pendulum and packed hole assemblies have been developed and used in drilling.But there are little achievements in deviation control for drilling vertical well.In recent years,some new systems have been worked out in other countries,such as vertical well drilling system(VDS), straight hole drilling device (SDD),VertiTrak and PowerV.These systems are ideal for drilling highly-dipped formations and fault zones.The deviation tendency is very common in steep dip formations of China.Therefore,it is urgent to develop new deviation control devices and new technologies in China.

Key words: drilling, hole deviation control, pendulum assembly, packed hole assembly, downhole motor, steep dip formation