E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/127 (2006.01) E21B 33/124 (2006.01) E21B 34/08 (2006.01)
Patent
CA 2169382
A system for relieving pressurized fluid entrapped in a annular space between a casing and the surrounding wall of a well bore hole during deployment of a packer exterior of the casing for sealing engagement with the wall. When a packer is inflated in a zone where fluid is entrapped, such as an intermediate packer between two previously inflated packers, the squeeze pressure developed by the inflating packer has been found to be sufficient to prevent effective and lasting sealing of the intermediate packer. The present system includes a valve mechanism which is activated by the pressurized fluid providing for inflating the packer to open a passageway to bleed the entrapped fluid into the casing and to then close the passageway as inflation of the intermediate packer is completed.
La présente invention vise un système permettant de libérer un fluide sous pression piégé dans l'espace annulaire compris entre un tubage et la paroi d'un puits de forage au moment du déploiement d'un packer, à l'extérieur du tubage, destiné à sceller ledit espace. Il a été démontré que lorsqu'un packer est gonflé dans une zone où un fluide est emprisonné, comme dans le cas de la mise en place d'un packer intermédiaire entre deux packers déjà gonflés, la pression générée est suffisante pour empêcher le packer intermédiaire d'assurer un scellement durable et efficace. Le système, objet de la présente invention, comporte une soupape actionnée par le fluide sous pression, qui permet d'acheminer dans le tubage, le fluide piégé dans l'espace annulaire, et de refermer par la suite le passage une fois le packer intermédiaire entièrement gonflé.
Marks & Clerk
Mcallister Petroleum Services Ltd.
Weatherford/lamb Inc.
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