Magyar Szenhidrogenipari Kutato-/fejleszto Intezet

Koolaj-es Foldgazbanyaszati Ipari Kutato Laboratorium

Vsesojuzny Nauchno-issledovatelsky Institut Burovoi Technici

Istvan Zsoka

Zoltan Toth

Geza Rakar

Vladilen A Galusztainc

Albert A Gaivoronsky

Aleksandr I Lisov

Anatoly A Cubin

Lev H Farukshin

Laszlo Madar

Piotr A Morzsic

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

The invention concerns apparatus for performing underground measurements during drilling of underground strata using conventional measuring instruments. It comprises a closed instrument casing filled with oil, an adaptor coupling the casing to the drilling pipe, a spring holder connected to the instrument casing and carrying damping spring means, a helical plate controlling angular displacement and a piston-and-cylinder displacement control device, a first bore in the adaptor for conveying mud to a downward section of the drilling pipe, a second closable bore in the adaptor for permitting mud to flow from the annular space around the pipe through the instrument casing, and a closable bore in the instrument casing for communicating the pressure in the interior of the drilling pipe to the instrument casing.

Apparatus for carrying out underground measurements during drilling of

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Budapest, Hungary

Istvan Zsoka