SwellStack

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Deployed by 10 companies

Wireline Retrievable DHSV SwellStack

Page last modified

June 17 2024

Downhole safety valves become corroded or damaged due to wireline activity. Standard chevron stacks in insert valves are unable to effectively seal in this damage and result in a leak path for hydrocarbons to migrate up the control line.

SwellStack, a swellable sealing solution with multiple chevron seals, is installed in place of an existing chevron stack.

This patented technology regains well integrity, effectively providing a seal of 10,000psi in liquid and gas.

Pros & Limitations

Extends the life of existing DHSVs

Simple deployment on wireline

Maximum reliability for severely damaged and corroded seal bores

Maintains well integrity

Removes requirement for DHSV straddles and potential workovers

Easily retrieved on wireline

Cost-effective solution

Custom-designed to suit customer requirements

Hybrid swellable compound is currently not available

Specification

Specification Title	Specification Description
Asset Life Extension	Regains and maintains well integrity, as well as successfully restoring production.
Cost	Proven to be a simple solution with minimal cost to the operator. Significant cost reductions are seen compared to a work-over or a replacement of the damaged DHSV.
Capabilities	Tendeka design, manufacture and supply a range of patented SwellStacks in a large variety of sizes and different elastomeric compounds.
Operating Conditions	Designed, manufactured and rated specifically for each application and within a temperature range between 0-250°C.
Patents	Tendeka’s patented technology (patent No WO2006045794 A1).
Sealing	SwellStack, is a swellable sealing solution which is designed to seal in damage within the bore of a safety valve.