US 2019/0169983 A1 · SUBSEA ISOLATION SLEEVE SYSTEM

Abstract

A technique facilitates pressure testing of a seal positioned between a wellhead and a subsea tree system. The technique utilizes an isolation sleeve which may comprise a mandrel having an internal mandrel passage as well as a lower seal and an upper seal positioned along an exterior of the mandrel. The isolation sleeve also may comprise a retention member mounted along the exterior of the mandrel. The retention member, e.g. a retention nut, may be rotatably mounted about the exterior of the mandrel and may comprise external threads or other mechanism for securing the isolation sleeve to the subsea tree system. In some embodiments, the upper end of the isolation sleeve may be constructed in a uniform manner for insertion into a universal profile of the subsea tree system.

Claims20

Dependent claims

A system for use in a subsea operation, comprising:

a wellhead having an internal wellhead passage;
a subsea tree system having an internal passage, the subsea tree system being sealably coupled with the wellhead via a seal;
and
an isolation sleeve extending from the internal passage of the subsea tree system into the internal wellhead passage to facilitate pressure testing of the seal, the isolation sleeve comprising:
a mandrel formed as a single, continuous structure having an internal mandrel passage;
a lower seal position along an exterior of the mandrel for sealing engagement with the wellhead;
an upper seal positioned along the exterior of the mandrel for sealing engagement with the subsea tree system;
and
a retention nut mounted along the exterior of the mandrel between the upper seal and the lower seal, the retention nut being threadably engaged with the subsea tree system along the internal passage.

6 more elements

Dependencies are inferred from the claim text.

Subsea isolation sleeve system

Life of this patent

Subsea isolation sleeve system

Life of this patent

Abstract

Claims20