Open hole straddle system and method for setting such a system

Details Open hole straddle system and method for setting such a system Open hole straddle system and method for setting such a system

E - Fixed Constructions

21

B

E21B 33/127 (2006.01) E21B 33/124 (2006.01)

Patent

CA 2212743

A set of inflatable well packing elements (11, 13) are separated by a variable length of tubing and are set in a well to isolate a segment of the annulus by applying fluid under pressure through a tubing string to the well packing elements. The flow of the fluid under pressure to the inflatable packing elements is regulated by a flow control valve (10) which automatically cuts off the fluid flow at a predetermined tubing to annulus pressure differential and opens communication between the tubing string (96) and the isolated well zone. Fluid may thereafter be pumped into or swabbed from the isolated zone. Upon completing the zone servicing, pulling the tubing string up slightly will both equalize the pressure across the inflatable packing elements, and deflate the packing elements. Thereafter, the tubing string may be retrieved from the well or, if desired, moved to another location which can be serviced in the same manner.

Des packers (11, 13) gonflables pour puits sont séparées par différentes longueurs de tubage et placés dans le puits pour isoler un segment de l'espace annulaire en appliquant un fluide sous pression par le tubage de forage aux packers du puits. Le flux de fluide sous pression aux packers gonflables est commandé par une valve (10) qui coupe automatiquement le débit de fluide à un différentiel de pression prédéterminé entre le tubage et l'espace annulaire et met en communication le tubage (96) de forage avec la zone isolée du puits. Le fluide peut ensuite être pompé dans ou extrait de la zone isolée. Lorsque le traitement de la zone est terminé, le tubage de forage est monté légèrement, ce qui égalise la pression des deux côtés des packers gonflables et dégonfle les packers. Le tubage de forage peut alors être extrait du puits ou, lorsque cela est souhaité, déplacé vers un autre emplacement qui peut être traité de la même manière.

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