Patent ID: 8485268

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; a thermally responsive material that resides in an annulus that is defined between the first and second elongate tubular bodies, 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 a specified distance in the first direction relative to the second elongate tubular body in response to a temperature change of the thermally responsive material; a hydraulic volume about the second elongate tubular body, where the thermally responsive material comprises a phase change material that is solid below a specified temperature and flowable above the specified temperature, the phase change material sealing the hydraulic volume when the phase change material is solid and not sealing the hydraulic volume when the phase change material is flowable; and a fluid in the hydraulic volume that, when sealed in the hydraulic volume, axially fixes the first elongate tubular body against movement in a first direction relative to the second elongate tubular body.