Drilling an oil or gas well at a location or well pad site at which drilling has occurred previously within 5 years prior to the date of spudding the well.

钻探油井或气井，在一个地点或良好垫地盘有钻探曾在5年前发生的钻井日期。

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With drilling being the determinate cost, new techs like multi-pad drilling and ultra-mobile drill rigs attract a lot of attention.

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As much as 150, 000 gallons of ultra-low sulfur diesel and about 12, 000 gallons of other petroleum products are on board the Kulluk, a double-hulled steel vessel with a helicopter landing pad and tower in the middle designed for drilling in Arctic waters.

CNN: Alaska drilling rig towed to harbor off Kodiak Island