Sand control seal for subsurface safety valve

Details Sand control seal for subsurface safety valve Sand control seal for subsurface safety valve

E - Fixed Constructions

21

B

E21B 34/10 (2006.01)

Patent

CA 2455476

A seal is provided to prevent contamination by sand or grit in the clearance between a flow tube and the inner housing wall in a safety valve. An enlarged space is provided adjacent the seal to allow accumulation of sand or grit in the annular clearance space without causing seizure of the flow tube. The insert safety valve is assembled without a spacer with a seal mounted to the lower end of the insert valve to engage the bottom sub on the SSV. As a result, particularly for larger sizes of insert safety valves, the assembly is lighter and shorter, which facilitates use of readily available standard lubricator and wireline equipment.

L'invention concerne un joint d'étanchéité empêchant une contamination par du sable ou par des gravillons dans l'espace entre une tuyauterie d'écoulement et la paroi intérieure du logement d'un clapet de sécurité. Un espace agrandi est pratiqué adjacent au joint d'étanchéité afin de permette une accumulation de sable ou de gravillon dans l'espace libre annulaire sans provoquer un grippage de la tuyauterie d'écoulement. Le clapet de sécurité inséré est assemblé sans espaceur avec un joint monté à l'extrémité inférieure du clapet de sécurité afin d'engager la réduction de fond sur le clapet de sécurité souterrain. Il en résulte que, particulièrement pour des clapets de sécurité insérés de plus grands diamètres, l'assemblage est plus court et plus léger, ce qui facilite l'utilisation d'équipement de câble et de lubrifiant standards disponibles.

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