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

The only solution for a leaking safety valve was to perform a straddle or workover, and replace the damaged valve. This proved to be costly and time consuming.

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

This patented technology has been utilised with multiple operators globally, to regain well integrity via the safety valve. Comprising 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, Tendeka formed a partnership with Wellvene, further developing this technology, ensuring greater capabilities.
Tendeka will work with you to design and engineer a sealing solution tailored to your requirements. Whether accommodating non-standard internal diameters or unique fluid parameters, the end result is a system that perfectly fits the needs of your project.

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For more information, please contact: swellstack@tendeka.com

Bespoke designed swellable seals replace chevron seal stacks to provide pressure integrity in damaged side pocket mandrel bores.

The Side Pocket Mandrel Plug is a system component that provides a means of isolating damaged or leaking side pocket mandrels and gas-lift valves.  Tendeka’s oil and water swellable elastomers operate within a wide temperature range from 320°F(0°C) to 480°F (250°C), and are rated at 5,000psi continuous working pressure.

Tendeka offers a range of sealing technologies and can work with you to design and engineer a bespoke sealing solution tailored to your requirement.  Whether accommodating non-standard internal diameters or unique fluid parameters, our materials scientists have developed proprietary elastomer technology to deliver reliable isolation performance across a variety of well characteristics.

SwellRight swellable sleeves are a flexible barrier solution suitable for applications where a pressure seal or zonal isolation is required.  They reduce well construction costs, extend well life, and improve well integrity. These permanent packers provide the long-term stability and reliability required to isolate producing zones.  Tendeka’s proprietary elastomer technology has an extensive track record in delivering reliable isolation performance across a variety of temperature and salinity profiles, generating more radial seal force than any other swellable on the market.  After swelling, the element maintains flexibility where it can react to subsequent changes in the wellbore.

Tendeka has developed a cost-effective alternative sleeve for use in horizontal applications. Our SwellRight Elite sleeve utilises patented technology to provide a sleeve without an internal core but ensure the stability and pressure ratings required for vertical and horizontal applications.

Tendeka’s SwellRight Ultra sleeve is a high spec sleeve, capable of holding up to 5000psi and achieving high push off force ratings.  Commonly run with the FloUltra Premium Screen Range, they are field proven to reduce operational costs, improve well integrity and extend the life of horizontal, vertical and multi-lateral wells.

Our SwellRight Split Sleeve has been designed to work in conjunction with the 7” expandable screens to ensure zonal isolation integrity.  The cross coupling split swell sleeve fills the void visible at the coupling as soon as the screens have expanded, ensuring a correct fit over the require dimensions.