Length(s) of pipe mounted between the wireline blowout preventer and the stuffing box (or hydraulic packing head). Sometimes long enough to enclose the entire downhole instrument. Usually between 2 and 3 feet long. Should be equipped with 2 in. outlet through which the well can be killed or flowed if necessary. Under pressure, when broken cable strands bunch up under glands in the stuffing box, the blowout preventer can be closed and wires removed. If the downhole tool assembly is too long to fit inside a short (2-3 ft riser), the blowout preventer can be closed, the cable can be cut at a specific distance measured from the blowout preventer and a long riser with stuffing box installed. See illustration at lubricator. Also compare marine drilling riser.
terms:riser
terms/riser.txt · Last modified: 2023/11/22 08:42 by 127.0.0.1