| 摘要 |
A high temperature packer supported on a tubular string in a well includes a packer mandrel 12 and an elastomeric packer body 14 surrounding the mandrel and radially expandable to seal an annulus about the mandrel. Upper and lower packer heads 16 are positioned about the mandrel and secured to the respective axial ends of the packer body. A connector in the form of a radially outwardly biased C ring 24 is radially compressed to interfere in circumferential grooves 25 , 26 in the mandrel and the packer head respectively to axially secure the mandrel to the packer head. The C ring is held radially compressed by a temperature responsive element that, when the temperature in the well reaches a predetermined level, yields to release the radial bias of the C ring so that the ring expands into the groove 26 and out of the groove 25 to disengage the C ring from the mandrel and allow the head to remain stationary while the mandrel expands and contracts axially as the temperature changes.
|
