Tubing head spool actuation through landing string
AssigneeVetco Gray U.K., Limited
InventorDarren Lee Miller
Life of this patent
Estimating the term…
Abstract
A landing string for landing a tubing hanger in a tubing spool has flow lines for actuating annulus access valves. A tubing string depends from the tubing hanger, and projects into a wellbore lined with casing when the tubing hanger is landed. Piping outside of the tubing spool connects to a bore formed through the tubing spool to provide access to an annulus between the tubing string and casing. The annulus access valve is in the flow line to control flow to the annulus. The valve is driven by an actuator that is operated by fluid in a flow line ported through the landing string, and in communication with the tubing spool when the tubing hanger is landed.
Claims17
A subsea assembly comprising:
- an annular outer wellhead member;
- an annular inner wellhead member insertable within the outer wellhead member;
- a tubular string depending from the inner wellhead member and that is circumscribed by an annulus;
- a flow line having an end intersecting the annulus;
- a valve in the flow line selectively moveable between an open position to a dosed position;
- and
- an actuator coupled to the valve and in communication with a motive source through a passage formed through the outer tubular and the inner tubular.
A subsea assembly comprising:
- a tubing head spool mounted over a wellbore;
- a landing string comprising, a subsea test tree, a running tool connected to the subsea test tree, and a tubing hanger connected to the running tool and selectively insertable in the tubing head spool;
- an annulus access line having a portion projecting through the tubing spool;
- a valve in-line with the annulus access line and that is moveable between an open position and a closed position;
- and
- an actuator coupled to the valve and connected to a power source by a line extending through the landing string and tubing head spool.
A method of handling a subsea assembly that comprises a landing string having a tubing hanger, the method comprising:
- a. lowering the landing string subsea and landing the tubing hanger within a tubing head spool;
- b. selectively opening an annulus access valve to provide communication to an annulus circumscribing the tubing head spool by communicating a motive source along a path that extends through the landing string.
Dependencies are inferred from the claim text.