Subsea well safing system
First Claim
1. A subsea well safing package for installing on a blowout preventer stack on a subsea well, the package comprising:
- a safing assembly connector interconnecting a lower safing assembly and an upper safing assembly, the safing assembly connector operable to a disconnected position, wherein the lower safing assembly is to be connected to a blowout preventer stack on a subsea well and the upper safing assembly is to be connected to a marine riser;
the lower safing assembly comprising lower slips to engage and secure a tubular suspended in a bore formed through the lower and the upper safing assemblies;
the upper safing assembly comprising upper slips operable to engage and secure the tubular; and
a shear positioned between the upper slips and the lower slips, the shear operable to shear the tubular.
1 Assignment
0 Petitions
Accused Products
Abstract
A subsea well safing method and apparatus adapted to secure a subsea well in the event of a perceived blowout in a manner to mitigate the environmental damage and the physical damage to the subsea wellhead equipment to promote the ability to reconnect and recover control of the well. The safing assembly is adapted to connect the marine riser to the BOP stack. Pursuant to a safing sequence, the well tubular is secured in the upper and lower safing assemblies and the tubular is then sheared between the locations at which it has been secured. Subsequently, an ejection device is actuated to physically separate the upper safing assembly and connected marine riser from the lower safing assembly that is connected to the BOP stack.
-
Citations
20 Claims
-
1. A subsea well safing package for installing on a blowout preventer stack on a subsea well, the package comprising:
-
a safing assembly connector interconnecting a lower safing assembly and an upper safing assembly, the safing assembly connector operable to a disconnected position, wherein the lower safing assembly is to be connected to a blowout preventer stack on a subsea well and the upper safing assembly is to be connected to a marine riser; the lower safing assembly comprising lower slips to engage and secure a tubular suspended in a bore formed through the lower and the upper safing assemblies; the upper safing assembly comprising upper slips operable to engage and secure the tubular; and a shear positioned between the upper slips and the lower slips, the shear operable to shear the tubular. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A subsea well safing system, comprising:
-
a safing assembly comprising a lower safing assembly connected to a blowout preventer stack connected to a subsea well and an upper safing assembly connected to a marine riser; a safing assembly connector in a latched position interconnecting the lower safing assembly and the upper safing assembly providing a bore therethrough in communication with the marine riser and the well, the safing assembly connector operable to an unlatched position thereby disconnecting the upper safing assembly from the lower safing assembly; and an ejector device connected between the upper safing assembly and the lower safing assembly, the ejector device operable to push the upper safing assembly and the lower safing assembly apart and thereby physically separate the upper safing assembly and connected marine riser from the lower safing assembly. - View Dependent Claims (13, 14)
-
-
15. A subsea well safing sequence, the method comprising:
-
utilizing a safing assembly installed between a blowout preventer stack of a subsea well and a marine riser, the safing assembly comprising a lower safing assembly connected to the blowout preventer stack and an upper safing assembly connected to the marine riser forming a bore between the riser and the blowout preventer stack, wherein the lower safing assembly comprises lower slips and the upper safing assembly comprises upper slips; securing a tubular suspended in the bore with the lower slips at a position in the lower safing assembly; securing the tubular with the upper slips at a position in the upper safing assembly; shearing the tubular in the bore between the position in the lower safing assembly and the position in the upper safing assembly at which the tubular has been secured; and after shearing the tubular, physically separating the upper safing assembly and the connected marine riser from the lower safing assembly connected to the blowout preventer stack. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification