High expansion sealing device with leak path closures

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/128 (2006.01) E21B 33/12 (2006.01)

Patent

CA 2496036

A high expansion packer or bridge plug is described. It features an external portion of a soft material (28) that flows into spiral exterior leak paths (30) formed when the sealing element (20) is subjected to longitudinal compression. Preferably, the sealing element is an elastomer such as cured rubber, while the outer material (28) is a soft uncured or somewhat cured rubber. The outer covering (28) may itself be covered for protection when running in with such protective covering (36) breaking or otherwise getting out of the way during the element compression process. As a result of compression, the soft material occupies the exterior helical or other leak paths for a sufficient length along the sealing element to withstand high differential pressures, without leakage.

L'invention concerne un élément à dilatation élevée ou un bouchon de support. Il comprend une partie externe d'un matériau mou (28) qui s'écoule dans des chemins de fuites externes (30) en spirale qui sont formés lorsque l'élément d'étanchéité (20) est soumis à une compression longitudinale. De préférence, l'élément d'étanchéité est un élastomère, par exemple un caoutchouc durci, tandis que le matériau extérieur (28) est un caoutchouc mou non durci ou relativement durci. Le revêtement extérieur (28) peut être lui-même recouvert aux fins de sa protection lorsqu'il pénètre, ledit revêtement de protection (36) se rompant ou s'écartant lors du procédé de compression de l'élément. De la compression, il résulte que le matériau mou occupe le chemin de fuite hélicoïdal externe ou d'autres chemins de fuites sur une longueur suffisante le long de l'élément d'étanchéité de façon à résister à des pressions différentielles élevées, sans qu'il y ait des fuites.

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