초록 ▼

A lightweight ROV deployable tree cap (28) for deployment on a subsea production hub (10) of a subsea tree. A tree cap (28) has a lightweight body (30) with parallel planar sides and including suitable openings and slots for mounting of the various operating elements. A seal plate structure (64) inc

A lightweight ROV deployable tree cap (28) for deployment on a subsea production hub (10) of a subsea tree. A tree cap (28) has a lightweight body (30) with parallel planar sides and including suitable openings and slots for mounting of the various operating elements. A seal plate structure (64) includes a piston (66) connected to a seal plate (68) having a pair of downwardly projecting tubular seal members (70, 72) for fitting within the production bore (13) and annulus bore (15) of the tree hub (10) in a sealed landed position. Fluid pressure is applied to fluid line (96) to urge piston (66) and seal plate (68) downwardly into sealing landed position. For removal or retrieval of tree cap (28) from the installed position on subsea tree hub (10), fluid pressure is applied through fluid lines (108, 110) for the upward movement of seal plate (68) and tubular seal members (70, 72) from sealing relation with production bore (13) and annulus bore (15). Hydraulic fluid is supplied from the ROV through fluid coupling devices (98, 112) which are insertable within receptacles (110,114) in the tree cap body (30). The fluid couplers (98, 112) are removed from the operating receptacles after installation of the tree cap (28) and are parked in other receptacles on A tree frame until needed for further service, such as removal of the tree cap (28). A spare tree cap may be positioned on the tree frame and installed on the tree hub by the ROV.

대표청구항 ▼

[ What is claimed is:] [1.] A method of forming a ROV deployable tree cap constructed and arranged for installation on a production hub of a subsea tree; said method comprising the steps of:forming a tree cap body from a lightweight non-metallic material to define a pair of generally parallel sides

[ What is claimed is:] [1.] A method of forming a ROV deployable tree cap constructed and arranged for installation on a production hub of a subsea tree; said method comprising the steps of:forming a tree cap body from a lightweight non-metallic material to define a pair of generally parallel sides connected by upper and lower ends;positioning a metallic sealing member movable relative to said non-metallic body on the lower end of said non-metallic body;providing fluid control means on said tree cap body to effect movement of said sealing member relative to said body; andmoving said metallic sealing member downwardly in response to said fluid control means relative to said body into a sealing position with the production bore of said hub.