Independent global completions service specialist Tendeka has worked with design engineering and manufacturing company Wellvene to create and qualify a new version of its swellable sealing solution, SwellStack.
The introduction of the enhanced Tendeka/Wellvene SwellStack provides a cost-effective sealing solution that is compatible with all Wellvene and original equipment manufacturer (OEM) insert safety valves.
The use of the patented technology ensures production can be reinstated to wells that are closed in due to the failed sealing of an insert safety valve, thereby eliminating any requirement to consider higher cost and long lead straddles or potential workovers.
Downhole safety valve seal bores can become corroded or damaged due to intervention activity such as wireline. Standard chevron stacks commonly provided for insert safety valves may be unable to effectively seal within such damaged bores. This results in a leak path for hydrocarbons to migrate up the control line. In such cases, the only solution is to perform a straddle installation or workover the upper completion and replace the damaged valve. Both options are costly and time-consuming.
Originally launched by Tendeka in 2013, the SwellStack has been utilised in more than 180 installations globally prior to the release of the next-generation design. Comprising of swellable O-ring technology and a bespoke chevron seal design, the swellable O-ring expansion within the damaged bore activates the chevron seals to both effectively and reliably provide integrity for up to 10,000psi in liquid and gas.
