Packer sealing element with shape memory material

Details Packer sealing element with shape memory material Packer sealing element with shape memory material

E - Fixed Constructions

21

B

E21B 33/12 (2006.01) E21B 33/128 (2006.01) E21B 36/00 (2006.01)

Patent

CA 2648847

A packer or bridge plug uses a sealing element made from a shape memory polymer (SMP). The packer element receives heat to soften the SMP while the element is compressed and retained. While so retained, the heat is removed to allow the SMP to get stiff so that it effectively seals a surrounding tubular. High expansion rates are possible as the softness of the material under thermal input allows it to be reshaped to the surrounding tubular from a smaller size during run in and to effectively retain a sealed configuration after getting stiff on reduction in its core temperature while longitudinally compressed.

La présente invention concerne une garniture d'étanchéité ou un bouchon provisoire qui comporte un élément d'étanchéité constitué d'un polymère à mémoire de forme (SMP). L'élément de garniture est soumis à de la chaleur afin de ramollir le SMP alors que l'élément est comprimé et retenu. Alors qu'il est ainsi retenu, la chaleur est retirée afin de permettre au SMP de devenir rigide de manière à rendre efficacement étanche un matériel tubulaire environnant. Des vitesses de dilatation élevées sont possibles puisque la mollesse du matériau sous l'effet d'un apport de chaleur permet de le façonner à nouveau sur le matériel tubulaire environnant à partir d'une taille plus petite lors d'une entrée et de conserver efficacement une configuration scellée après durcissement lors de la baisse de sa température à coeur pendant sa compression longitudinale.

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