Multilayered ball sealer and method of use thereof

E - Fixed Constructions – 21 – B

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Details

E21B 33/138 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2701700

A multilayered ball sealer having a deformable layer. The multilayered ball sealer has an outer or intermediate layer that is deformable under pressure. In the former, the deformable layer may be water-soluble or hydrolysable. In the latter, the outer layer is a sheath that contains the deformable layer and adapts to its shape. A multilayered ball sealer may be used as a diversion agent by being suspended in a fluid injected into a wellbore and applying pressure to deform the shape of the intermediate layer such that the multilayered ball sealer adapts to the shape of a perforation opening on which the multilayered ball sealer has seated.

La présente invention porte sur un obturateur sphérique multicouche ayant une couche déformable. L'obturateur sphérique a une couche externe ou intermédiaire qui est déformable sous pression. Dans la première, la couche déformable peut être soluble dans l'eau ou hydrolysable. Dans la seconde, la couche externe est une gaine qui contient la couche déformable et s'adapte à sa forme. Un obturateur sphérique multicouche peut être utilisé comme agent de diversion en étant suspendu dans un fluide injecté dans un puits de forage et en appliquant une pression pour déformer la couche intermédiaire de telle sorte que l'obturateur sphérique multicouche s'adapte à la forme d'une ouverture de perforation sur laquelle l'obturateur sphérique multicouche a été placé.

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