| 摘要 |
An offshore exploratory well is plugged, cut off just above the mud line, and left until equipment for completion of the well is ready. A cementing sub installed just above the mud line in one or more casing strings has a sleeve surrounding a joint in the casing strings and isolating that joint from fluids in the surrounding annulus between casing strings. Before leaving the well, the casing strings are cut off through the cementing subs above the joint within the subs to leave a portion of casing connected in the joint. That portion of casing can be removed to leave threads for tying back into the well.
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