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10 Deploys

Wireline Retrievable DHSV SwellStack

Page last modified
August 4 2023

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.


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


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.

Relative Business Impact


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Technology Readiness Level


Development Technology demonstration Mature / Proven
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Tendeka is a global specialist in advanced completions, production solutions and sand management for the oil and gas industry.

From simple to complex well designs, the company has extensive track record in enhancing productivity for clients’ reservoirs offshore and onshore. Tendeka invests in research and development, bringing to market disruptive technologies and offering solutions targeted to operators’ specific production challenges.

Established in 2009, Tendeka operates globally: regional HQs in Europe, Asia Pacific, Middle East, North America

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