Barrier for instrumentation piping
AssigneeRoxar Flow Measurement AS
InventorsPer Hassel Sørensen, Gunnar Hviding
Life of this patent
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Abstract
A well head barrier assembly (1, 2, 3) including a termination of an instrument tube (9) installed in a well and a primary pressure barrier (3) for the well pressure comprising a tool (10) arranged for being pushed into a passage (5) in which the instrument tube (9) is arranged. The closing of the passage (5) provides an additional secondary pressure barrier in the well head, thus enabling re-establishment of a double pressure barrier following a breakage of the instrument tube (9).
Claims8
A well head barrier assembly (1, 2, 3) comprising a termination of an instrument tube (9) installed in a well and a primary pressure barrier (3) for the well pressure, characterized by
- a tool (10) arranged for being pushed into a passage (5) in which the instrument tube (9) is arranged, whereby closing of said passage (5) provides an additional secondary pressure barrier in the well head, thus enabling re-establishment of a double pressure barrier following a breakage of the instrument tube (9), and
- a wall of said passage (5) for allocating said instrument tube (9) is provided with a weakened section (6), said weakened section (6) typically being substantially thinner than other sections of the passage wall.
Method for enabling re-establishment of a double pressure barrier in a well in the event of breakage in an instrument tube (9) of said well, comprising
- providing a well with a well head barrier assembly (1, 2, 3) having a tool (10) capable of sealing a passage (5) for allocating an instrument tube (9), and
- using said tool (10) to seal said passage (5) following the occurrence of a leakage or breakage of said instrument tube (9), thereby re-establishing a double pressure barrier.
Dependencies are inferred from the claim text.