Hybrid Safety Valve Straddle System

Hybrid Safety Valve Straddle System

  • Virtually eliminates risk of damaging seals during installation as the seals run 'under gauge'
  • Simultaneous seal energisation enables purging of control line
  • Can be retrofitted and used with any OEM WRSSSV
  • Patent application has been filed; Dual Isolation Bore Seal System, No:GB1909398.8

The Hybrid Straddle system was developed to overcome the limitations of WRSSSV Systems, boasting a unique sealing system that expands into the seal bore providing many operational benefits.

The Hybrid Safety Valve Straddle system features an upper and lower set of expanding seals that are interconnected by a mechanical linkage system. As a result both the upper and lower seal expand into the centre of the target seal bore simultaneously, potentially improving sealing capability in a damaged seal bore.

When run into the seal bore the diameter of the seal is less than the diameter of the straddle, known as running 'under-gauge'. This means the straddle lands on the Profile No-Go without the need to force the seals into the target seal bore. This feature virtually eliminates the risk of damaging the seals as they are naturally protected.

A wiper seal is positioned immediately below the lower set of expanding seals to provide a temporary seal below the lower seals of the straddle. This allows pumping of hydraulic control line fluid to flush out any residual, trapped gas within the control line. An exit port sits above the upper seals of the straddle allowing excess fluid to escape. In this way the control line can be fully purged to ensure clean hydraulic fluid. Once in position inside the TRSSSV the seals are then energised and expand into the seal bores simultaneously.


Straddle Schematic4

The Hybrid Safety Valve Straddle is deployed on slickline into the well and located inside the downhole safety valve. The seals, being under-gauge, are free to pass the upper and lower seals bores of the downhole safety valve. Therefore the Hybrid Straddle will land off at the nipple No-Go.

Following flushing of the control line, light downward jarring will set the Hybrid Straddle. During the setting sequence the lock dogs are located into the corresponding nipple key profile. Next the top and bottom set of dual sealing elements are expanded simultaneously into the seal bores, thereby instantly isolating the safety valve control line system. Further jarring releases the running tool and then it is possible to pressure up the control line and open the wireline retrievable safety valve.

The Hybrid Straddle system is compatible with existing OEM supplied wireline retrievable safety valves or can be paired with the Oilenco wireline retrievable safety valve.

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