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A liner hanger is used to suspend a liner inside of a string of casing. The reasons for this are varied but include; preventing damage to the liner due to buckling, preventing damage to the liner from pulling and pushing tools, and installing a slotted production liner. Rigger Engineering offers two basic types of liner hanger; those with seals and those without seals.

Plain Hangers

The plain liner hanger is our basic liner hanger design. It is used to hang a liner where no type of seal or packer is required. As with all of our liner hangers it comes in (3) basic configurations…Single Slip; Double Slip; and Hold Down slip. It was the first liner hanger to feature the recessed slip design whereby each slip is contained within it’s own pocket. This prevents the hanger from hanging up on ledges or doglegs and possibly damaging the slips or the hanger. It also makes it virtually impossible to set the hanger prematurely while tripping into the hole. The plain hanger can be used in oil or gas wells but is especially effective in geothermal applications.

Seal Type Hangers

We offer several different liner hangers with seals. These are broken down into (3) basic types…the regular action type where the weight of the liner helps to set the seal once the releasing tool is disengaged; the delayed action type where the seal is set in an operation independant of the hanging operation; and the circulating type which is similar to the delayed action type but features circulation ports to help direct fluid around the seal during circulation operations. All of these come in Single Slip, Double Slip, or Hold Down Slip versions. The type of seal is varied. Lead is the least expensive and is useful where a low pressure seal is required. The lead seal is rated at about 1,000 psi. Rubber seals come in a wide variety that are progressively more expensive. Neoprene is the least expensive type of rubber while EPDM is slightly more expensive but is rated for temperatures up to about 350 degrees. Viton and aflast are rated at even higher temperatures and have different properties depending on the environment where they are being used. They are also both substantially more expensive. All of the rubber seals are rated for about 3,000 psi pressure.


September 2017
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