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SwellStack
Wireline Retrievable DHSV SwellStack
Page last modified
May 22 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.
Pro/con
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
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
Technology Readiness Level
[9/9]
Development
Technology demonstration
Mature / Proven
Technology deployed by:
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