Multiple-block downhole anchors and anchor assemblies

Details Multiple-block downhole anchors and anchor assemblies Multiple-block downhole anchors and anchor assemblies

E - Fixed Constructions

21

B

E21B 23/01 (2006.01)

Patent

CA 2741118

Multiple-block downhole anchors and anchor assemblies are provided. A downhole anchor assembly for a tubing string includes an anchor block, a drag block, a biasing arrangement, and a mandrel to be coupled to the tubing string. The anchor block moves, with rotation of the mandrel, between a run position out of contact with a well bore and a set position in contact with the well bore to set the downhole anchor assembly in the well bore. The drag block contacts the well bore at least when the anchor block is out of contact with the well bore. The biasing arrangement biases the anchor block away from the well bore and the drag block toward the well bore. The anchor block is thus protected from the well bore by the drag block, and the biasing arrangement provides for automatic un-setting of the anchor block when torque is removed from the mandrel.

Cette invention concerne des ancrages et ensembles dancrage à blocs multiples pour fond de puits. Un ensemble dancrage pour colonne de production comprend un bloc dancrage, un bloc de traînée, un dispositif de sollicitation, et un mandrin à coupler à la colonne de production. Avec la rotation du mandrin, le bloc dancrage se déplace entre une position mobile dans laquelle il nest pas en contact avec un trou de forage, et une position installée dans laquelle il est en contact avec le trou de forage de manière à installer lensemble dancrage pour fond de puits dans le trou de forage. Le bloc de traînée entre en contact avec le trou de forage au moins quand le bloc dancrage nest pas en contact avec le trou de forage. Le dispositif de sollicitation sollicite le bloc dancrage à lécart du trou de forage et le bloc de traînée vers le trou de forage. Le bloc de traînée protège ainsi le bloc dancrage du trou de forage, et le dispositif de sollicitation assure une libération automatique du bloc dancrage quand le couple appliqué au mandrin est retiré.

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