Magyar Szenhidrogenipari Kutato-/fejleszto Intezet

Vsesojuzny Nauchno-issledovatelsky Institut Burovoi Technici

Piotr A Morzsic

Istvan Zsoka

Laszlo Madar

Albert A Gaivoronsky

Lev H Farukshin

Aleksandr I Lisov

Anatoly A Cubin

Vladilen A Galusztainc

The invention relates to a packer for separation of zones behind casing in a well bore. It comprises a casing string serving as mandrel for the packer, an expandable packing element and first and second sleeves tightly fixed to the peripheries of the packing element, wherein the first sleeve is sealed and movable in respect of the casing string and the second sleeve is tightly fixed to the casing string. According to the improvement in this invention, a sleeve plug slides on and is sealed against the casing string and has a thicker upper part and a thinner lower part, the upper part is slidingly arranged at least partially between the casing and the collar and is sealed against both of them, the lower part is slidingly arranged at least partially between the casing and the packing element. The first sleeve slides tightly on the sleeve plug. A non-return valve in the casing connects the inside and the outside of the casing at the packing element. A bore in the lower portion of the sleeve plug connects the outside of the casing and the inside of the packing element. Another bore in the casing above the upper portion of the sleeve plug connects the outside of the casing and the inside of the collar.

Packer for separation of zones in a well bore

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Piotr A Morzsic