Downhole safety valves can easily become corroded or damaged due to wireline activity. Standard chevron stacks are commonly provided with insert safety valves incapable of effectively sealing in this damage.

This results in a leak path that allows hydrocarbons to migrate up the control line.

The only solution for a leaking safety valve is to perform a straddle or workover, and replace the damaged valve, which is costly and time consuming.

In 2013 TAQA released SwellStack, a swellable sealing solution that can be installed in place of an existing chevron stack, sealing in damage within the bore of a safety valve.


This patented technology has been implemented with multiple operators globally, to regain well integrity via the safety valve. Comprised of a swellable seal element and multiple chevron seals, the swellable element seals damage in the seal bore and activates the chevron seals, effectively providing a seal for up to 10,000psi in liquid and gas.

In 2019, TAQA formed a partnership with Wellvene, further developing this technology, extending its scope of capabilities.

TAQA will work in collaboration with you to design and engineer a bespoke sealing solution tailored to your individual requirements. Whether accommodating non-standard internal diameters or unique fluid parameters, the result is always a system that perfectly satisfies the needs of your project.