LINERS

The Liner Top Packer is run above a Liner Hanger to provide an annular seal in the casing and prevents formation breakdown, loss of cement slurry, and gas migration above the liner top during cement curing. Different Liner Top Packer models available can be mechanically or hydraulically set.

The Liner Hanger securely anchors a liner in the wall of a previous casing string. Liner hangers are available in a range of sizes and specifications to suit a variety of conditions, including onshore and offshore wells, HPHT environments and high hanging capacity requirements.

The Liner Hanger is made up of a mandrel, and one or more sets of slips and cone pads. Different models can be set mechanically or hydraulically. A Liner Hanger is typically run with a Liner Top Packer to make up a Liner Hanger System.

In rare occasions, due to a variety of reasons, liner hanger packers can fail or leak. Some of the more common reasons for packer damage are:

•                     Excessive annular velocities from running speeds or pump rates

•                 Debris, scale, or solids across packer sealing area causing hanger skidding or ineffective seal

•                 Packer damage when running through BOP

•                 Casing wear at setting depth

•                 Exceeding technical or pressure ratings of selected liner hanger and packer

•                 Casing metallurgy or ID installed differs from specification provided

The liner top repair system utilizes a liner packer primarily run on drill pipe to repair a liner lap leak or in monobore liner top completions. The packer can also be run when tying back a liner to surface or scabbing across damaged casing above the liner.

The Liner Repair Packer operates using a mechanical or hydraulic setting tool and a liner setting sleeve with a polished bore receptacle (PBR) extension. The straight slack off weight setting mechanism eliminates pipe rotation, hydraulic setting ports and plugs or balls to set the packer.