Downhole anchor

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 23/01 (2006.01)

Patent

CA 2227057

A downhole anchor for preventing rotational movement of a member within a well has a central tubular member (10), a slip housing (20) and a drag assembly (13) disposed about the tubular member. The slip housing carries at least two slip members (26, 27, 28), each slip member being rotatable about an axis substantially parallel to the central axis of the tubular member between a retracted position against the housing, and an extended position. The drag assembly is mounted on and rotatable about the tubular member and carries drag means (14). An actuator drives the rotation of the slip member in response to the rotation of the drag assembly about the tubular member. Drag means comprise a spring loaded drag block to frictionally engage a well casing, or, alternatively, unique vane members for reacting with a viscous fluid trapped between the vane members and well casing to cause drag.

La présente invention concerne un dispositif d'ancrage fond-de-trou qui permet d'empêcher le mouvement rotatif d'un élément à l'intérieur d'un puits. Ce dispositif d'ancrage comprend un élément central tubulaire (10), un boîtier coulissant (20) et un ensemble de résistance (13) disposé autour de l'élément tubulaire. Le boîtier coulissant supporte au moins deux éléments coulissants (26, 27, 28), chacun de ces éléments coulissants pouvant tourner autour d'un axe sensiblement parallèle à l'axe central de l'élément tubulaire entre une position rentrée contre le boîtier et une position sortie. L'ensemble de résistance est monté pivotant sur l'élément tubulaire et supporte des moyens de résistance (14). Un actionneur entraîne la rotation de l'élément coulissant en réponse à la rotation de l'ensemble de résistance (14) autour de l'élément tubulaire. Les moyens de résistance comprennent un bloc de résistance sollicité par ressort de manière à entrer en contact par friction avec un cuvelage ou, dans une variante, des ailettes uniques qui entrent en réaction avec un fluide visqueux entre lesdites ailettes et le cuvelage, provoquant une résistance à l'entraînement.

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