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Annulus Annulus is space between tubular and open hole or cased hole. So swivel part connected to kelly or TDS it rotate whereas swivel part connected with rotary hose remain stationary. Drill string Drilling fluid or mud from swivel pass to drill string and it exits from bit. Where drilled cutting is removed.
The gushing itself would now be called a blowout and drillers nowadays have blowout preventers to stop the oil from springing up in a fountain. The Canadian oil sands are a case in point. EOR methods tend to be costly, but they can increase the amount of oil produced from a reservoir to as much as 75%.
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