Packer with back-up retrieving method

Details Packer with back-up retrieving method Packer with back-up retrieving method

E - Fixed Constructions

21

B

E21B 33/12 (2006.01)

Patent

CA 2193290

A packer or bridge plug is described which may be release by manipulation of the production tubing connected to it. If manipulation of the production tubing is unsuccessful in releasing the packer, the tensile strength of the production tubing need not be exceeded in attempting to remove the packer. Instead, the productiontubing is removed along with certain internal components of the packer. Thereaf-ter, heavy-wall tubing, with or without jars, can be lowered into the wellbore with a retrieving tool at the bottom of that string. The retrieving tool latches onto com- ponents of the packer to allow an alternative method of release which allows foruse of significantly higher tensile loads to liberate the packer from the wellbore.

a présente invention concerne un packer, ou garniture d'étanchéité, qui peut être délogé en manipulant le tube de production auquel il est connecté. Si cette manoeuvre ne réussit, il n'est pas nécessaire de solliciter le tube au-delà de sa résistance à la traction pour dégager le packer. Au lieu de cela, il faut retirer le tube du puits ainsi que certains éléments internes du packer. Par la suite, on peut descendre dans le puits un tubage à paroi épaisse doté ou non de coulisses et portant à son extrémité inférieure un outil de récupération. Celui-ci s'accroche aux éléments restants du packer pour offrir un autre moyen d'extraction qui permet de mettre en oeuvre des forces beaucoup plus élevées.

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