TESCO套管钻井技术

TESCO casing drilling technology

套管钻井技术是一种节约钻井时间,降低井下事故发生的全新的钻井工艺技术。套管钻井用油田常用的套管来代替钻杆,钻头和井底钻具组合接在电缆底部,由套管内送到井底并固定在套管底部;由于套管始终在井内且泥浆循环不间断,保证了井眼的完整性,减少了类似井壁脱落、坍塌等发生的可能;不用起下钻,减少了油气侵带来的井涌或井喷的危险事故发生。

Casing drilling is a new method for drilling wells that is aimed at reducing both drilling time and the incidence of unscheduled drilling events. With casing drilling, the well is not drilled with drill pipe; instead, it is drilled with standard oilfield casing that remains in the hole. Drill bits and other downhole tools are lowered on wireline inside the casing and latched to the bottom joint of casing. Since the casing remains in the well and circulation is maintained at all times, wellbore integrity is preserved, reducing the likelihood of certain problems associated with unscheduled events such as sloughing formations and washouts. Since drill pipe is.not being tripped, the risk of swabbing oil or gas into a well causing a kick or blowout is reduced.