Otis Engineering Corporation

Peter Cowan

Charles C Cobb

Kwok-Ping Wong

Eric R Ladbrook

A method and apparatus for injecting coiled tubing into a submerged well. The end of a coiled tubing is latched in a tubing injector and the tubing and injector are lowered through a body of water together. The injector is latched to the well and the injector moves the coiled tubing through the well. The injector weight is exerted on the tubing during movement through the body of water. The injector may be contained in a bell type or complete enclosure and fluid in the enclosure is maintained at approximately the external pressure. The injector may be connected to a shear, a stuffing box, and a tool receiver.

Method and apparatus for running coiled tubing in subsea wells

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.

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Montrose, United Kingdom

Peter Cowan