Method and system for running subsea test tree and control system without conventional umbilical
AssigneeSchlumberger Technology Corporation
InventorsVladimir Vaynshteyn, Joseph D. Scranton
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Abstract
A technique enables a simplified approach for providing subsea hydraulic control. A subsea installation comprises one or more devices that are actuated hydraulically. A simple signal carrier, such as a wireline logging cable, can be routed down to the subsea installation. However, hydraulic fluid for controlling the one or more hydraulic devices in the subsea installation is delivered via an open water umbilical that extends to the subsea installation from a separate workover control system.
Claims21
A system for providing subsea hydraulic control, comprising:
- a subsea test tree;
- a tubing hanger running tool;
- a plurality of hydraulically actuatable devices mounted in at least one of the subsea test tree or the tubing hanger running tool;
- a wireline conductor extending down through a drilling riser to an electro-hydraulic control system;
- and
- a separate workover control system, the separate workover control system having an open water umbilical that extends from a surface location to the electro-hydraulic control system to provide hydraulic fluid for controlling the plurality of hydraulically actuatable devices.
A method for providing subsea hydraulic control, comprising:
- positioning a subsea test tree and a tubing hanger running tool at a subsea location;
- locating a riser above the subsea test tree and the tubing hanger running tool;
- routing a signal carrier along the riser to the subsea test tree and the tubing hanger running tool;
- and
- supplying pressurized hydraulic control fluid to at least one of the subsea test tree and the tubing hanger running tool from an existing hydraulic fluid system of a workover control system.
A system, comprising:
- a subsea installation having a hydraulically actuatable device;
- a tubing extending upward from the subsea installation;
- a signal carrier extending along the tubing to the subsea installation;
- and
- an open water umbilical of a separate workover control system extending to the subsea installation to enable hydraulic actuation of the hydraulically actuatable device.
Dependencies are inferred from the claim text.