0 Reviews
Deployed by 10 companies

Wireline Retrievable DHSV SwellStack

Page last modified
April 11 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 Title Specification Description
Asset Life Extension
Regains and maintains well integrity, as well as successfully restoring production.
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.
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.
Tendeka’s patented technology (patent No WO2006045794 A1).
SwellStack, is a swellable sealing solution which is designed to seal in damage within the bore of a safety valve.


Get access to reviews

to your explorer or platform subscription to get access to the reviews written about this technology.

Technology Readiness Level

The Technology Readiness Level (TRL) indicates the maturity level of novel technologies. Learn more about the TRL scale used by us.


Development Technology demonstration Mature / Proven
Ask the supplier
 to contact this technology supplier.

TAQA Well Completions 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. TAQA Well Completions invests in research and development, bringing to market disruptive technologies and offering solutions targeted to operators’ specific production challenges.

Established in 2009, TAQA Well Completions operates globally: regional hubs in Europe, Asia Pacific, Middle East, North America

Relative Business Impact

Solution Deployed By
Company Name

to your explorer or higher plan to get access to all the 10 deployment references.

Last Deployment YearTotal DeploymentsComment