Patent ID: 8286701

Claim:
A wellbore device, comprising: a first elongate tubular body adapted to reside in a wellbore; and a second elongate tubular body coupled to the first elongate tubular body and adapted to reside in the wellbore; the wellbore device changeable between the first elongate tubular body axially fixed against movement in a first direction relative to the second elongate tubular body and axially moveable in the first direction relative to the second elongate tubular body in response to temperature above a specified temperature; and a phase change material that is solid below the specified temperature and flowable above the specified temperature, the phase change material residing about the second elongate tubular body and, when solid, axially fixing the first elongate tubular body against movement in the first direction relative to the second elongate tubular body, wherein the phase change material resides in an annulus defined between the first elongate tubular body and the second elongate tubular body; and the first elongate tubular body is sealed to the second elongate tubular body with two or more split metal seal rings arranged so that a gap in one seal ring is overlapped by an adjacent seal ring.