Well servicing system

Details Well servicing system Well servicing system

1988-06-06

1989-05-02

Novosad, Stephen J.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166 545, 166356, 166363, 166364, E21B 2904

Patent

active

048259535

ABSTRACT:
Disclosed is a wireline well servicing system for underwater wells utilizing a lubricator stack having upper and lower sections connected by a remotely operable connector. The lower lubricator section includes a remotely operable valve connectable to a wellhead and a stress joint connected on the valve. The valve may be closed to retain pressure control of the well if the stress joint is fractured in bending by side loading on the lubricator stack. The upper lubricator section includes a remotely operable wireline clamp and cutter unit on a stuffing box. The clamp and cutter are remotely operable by the same control conduit to quickly clamp and cut the wireline to permit emergency removal of the surface service vessel. After the service vessel has moved back into working position above the underwater well, wireline servicing operations may be continued by latching onto the clamp cutter unit with a pulling tool on wireline from the vessel, and lifting the clamp cutter unit while pulling the cut wireline through the stuffing box until the tools attached to the wireline reach top in the upper lubricator section. The upper lubricator section is disconnected from the lower section and lifted to the vessel to prepare the clamp and cutter unit for further operation and replace the cut wireline with continuous line.

REFERENCES:
patent: 2825536 (1958-03-01), Kenneday et al.
patent: 2919111 (1959-12-01), Nicolson
patent: 3766978 (1973-10-01), Orund et al.
patent: 4024718 (1977-05-01), Roche et al.
patent: 4653776 (1987-03-01), Borg
patent: 4673041 (1987-06-01), Turner et al.
patent: 4718487 (1988-01-01), Lanmon, II
SPE 16570, "A Complete Subsea Wireline System", Manzi et al., Sep. 1987.

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