Hi Trung and discussion group,
Straight pull recovery of Swell Packers can be possible, however there can be challenges due to the high friction / drag forces involved, especially in deep and deviated wells where workstring friction losses prevent the full surface applied force from reaching the fish (4-1/2 Casing with Swell Packers) especially when using a lightweight rig our hydraulic workover unit. Platform sub structure limitations can also be a concern which limit surface applied pull forces.
Ardyne can provide a Downhole Power Tool (DHPT - Sub-Surface Hydraulic Casing Jack) to deliver High Force Jacking immediately at the Casing downhole to recover the Lower Completion with Swell Packers without the need for Jarring or Milling operations.
It may be possible to pull the entire lower completion in one trip however if necessary the Lower Completion Can be cut into segments with a conventional downhole mechanical cutting tool and the Casing can be recovered in sections and individually jacked free with the DHPT. The DHPT should allow for recovery in larger sections than conventional cut and pull operations due to the controlled and sustained high force delivered without workstring friction losses.
We have an existing tool available for pulling 4-1/2" Casing inside 9-5/8" Host Casing.
Check out the following links for more details.
Hope this helps.
Notes from moderator: Great response by Ed, who also provided his email address. We have removed his email address, because we tend to discourage one-to-one contact, since it circumvents the rest of us (who may miss out on useful dialogue)