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US 8,950,430 B2Granted
Internal blow out preventer
AssigneeNational Oilwell Norway AS
InventorSlawomir Kukielka
Life of this patent
Estimating the term…
Abstract
An internal blow out preventer for use in a drill string, comprising a housing having an outer valve closure element and where the outer valve closure element is configured to be moved between an open and a closed position, wherein the outer valve closure element is provided with an inner valve closure element that is configured to be moved between an open and a closed position inside the outer valve closure element.
Claims23
An internal blow out preventer comprising:
- a housing having a central axis;
- an outer valve closure element rotatably disposed in the housing, wherein the outer valve closure element is configured to move between an open and a closed position;
- an inner valve closure element rotatably disposed within the outer valve closure element, wherein the inner valve closure element slidingly engages the outer valve closure element and is configured to move between an open and a closed position inside the outer valve closure element;
- and
- a ring coaxially disposed in the housing axially adjacent the outer valve closure element, wherein the ring includes an annular sealing surface that slidingly engages the outer valve closure member and is configured to seal against the outer valve closure element.
2 more elements
An internal blow out preventer comprising:
- a housing having a first end, a second end and a central bore extending between the first end and the second end along a longitudinal axis of the housing;
- an outer valve member movably disposed within the housing, wherein the outer valve member has a bore extending therethrough and an axis of rotation;
- an inner valve member movably disposed within and slidingly engaging the outer valve member, wherein the inner valve member has a bore extending therethrough and an axis of rotation coaxially aligned with the axis of rotation of the outer valve member;
- and
- a first ring disposed within the housing, wherein the first ring sealingly engages the outer valve member and is coaxially aligned with the longitudinal axis of the housing.
2 more elements
Dependencies are inferred from the claim text.