Hybrid Safety Valve Straddle System

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Isolates safety valve control line

Page last modified
December 17 2024

The Hybrid Safety Valve Straddle System is an innovative downhole intervention tool developed by Oilenco to overcome limitations of traditional wireline retrievable subsurface safety valve (WRSSSV) systems. It features a unique dual isolation bore seal system to provide superior sealing capability. 

The straddle is deployed on slickline into the wellbore and lands at the safety valve nipple no-go. It contains upper and lower expanding seals connected by a mechanical linkage. During setting, the seals are expanded simultaneously into the seal bores of the safety valve, isolating the control line. This "under gauge" design protects the seals during run in. 

Once set, the control line can be purged of gas by pumping fluid through a lower wiper seal and out an upper exit port. This ensures a clean hydraulic system. The safety valve can then be opened by pressuring up the control line. 

The simultaneous dual seal expansion provides reliable isolation even in damaged seal bores. The straddle is compatible with most major OEM safety valves. Its innovative sealing system and ability to purge gas makes it a superior solution for re-establishing control of wireline retrievable subsurface safety valves.

Pros & Limitations
1
Unique sealing system that expands into seal bore for improved sealing capability
1
Seals run 'under gauge' to virtually eliminate risk of damaging seals during installation
1
Can be retrofitted and used with any OEM WRSSSV
1
Contains patented Dual Isolation Bore Seal System
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Simultaneous seal energisation enables purging of control line
Specification
Specification Title Specification Description
Sealing System
Unique expanding seals that interconnect and energize simultaneously
Seal Diameter
Under-gauge, less than straddle diameter
Benefits
Eliminates seal damage risk during installation, Enables purging of control line
Compatibility
Existing OEM TRSSSVs or Oilenco WRSSSV
Patent
Dual Isolation Bore Seal System (GB2586537)
Deployment Method
Slickline
Setting Method
Light downward jarring
Locking Mechanism
Dogs locate into nipple key profile
Control Line Isolation
Instant upon seal expansion
Running Tool Release
Via further jarring

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Oilenco design, engineer and manufacture specialised well intervention and completion tool solutions for the global oil and gas industry. Founded in 2009, the company has facilities in Westhill, Aberdeen and Stavanger, Norway. Employing some of the best and most creative engineers in the industry, the team can develop a design from concept to completion, reinforced by manufacturing excellence, product inspection, validation testing and full product testing, supported by services including practical training, tool redressing and refurbishment. With an extensive rental fleet, they have a range of products available for immediate turnaround. Oilenco are committed to working closely with clients to develop high-quality solutions that optimise functionality of challenging offshore operations, reducing time and cost of operations, whilst maintaining integrity and safety critical processes.

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