Бурение грунтовых зондов, установка энергетических колодцев

On an offshore platform, a cassion pipe, usually 26 to 42 in. in outside diameter (OD), is driven into the sea bed to prevent washouts of near-surface unconsoli­dated formations and to ensure the stability of the ground surface upon which the rig is seated. It also serves as a flow conduit for drilling fluid to the surface. The cassion pipe is tied back to the conductor or surface casing and usually does not carry any load.

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