Fluid loss device

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/10 (2006.01) E21B 23/02 (2006.01) E21B 23/06 (2006.01) E21B 33/12 (2006.01) E21B 43/04 (2006.01) E21B 43/14 (2006.01)

Patent

CA 2197404

A fluid loss device has a housing, a seal assembly, a running tool, and a plug. The housing of the fluid loss device is placed in a production string before a well bore is completed. The plug is attached to the running tool, and the running tool is attached to a wash pipe. The fluid loss device is activated by lifting the wash pipe and the running tool, thereby engaging the plug with the seal assembly, engaging the seal assembly with the housing, and severing the plug from the running tool. Activation of the fluid loss device inhibits fluid communication through the fluid loss device and reduces damage to the well structure behind the fluid loss device while completion operations are performed in other areas of the well bore. The fluid loss device is deactivated by forcing the plug through the fluid loss device with mechanical force or pressure, or by chemically eroding the diameter of the plug until the plug passes through the fluid loss device. Once the fluid loss device is deactivated, the isolated area of the well bore is reopened for access through the production string.

L'invention concerne un dispositif de perte de fluide comportant un logement, un joint, un outil de pose et un bouchon. Le logement du dispositif de perte de fluide est placé dans une colonne de production avant la réalisation d'un puits de forage. Le bouchon est fixé à l'outil de pose, et l'outil de pose à un tube de surforage. On active le dispositif de perte de fluide en levant le tube de surforage et l'outil de pose, ce qui met le bouchon en contact avec le joint et celui-ci en contact avec le logement et dégage le bouchon de l'outil de pose. La mise en marche du dispositif de perte de liquide empêche la communication des fluides dans le dispositif et réduit les dommages à la structure du puits derrière le dispositif de perte de fluide pendant l'exécution des opérations dans d'autres secteurs du puits de forage. On désactive le dispositif de perte de fluide en forçant le bouchon dans le dispositif par application d'une pression ou d'une force mécanique, ou par érodage chimique du diamètre du bouchon jusqu'à ce que celui-ci puisse passer dans le dispositif. Une fois le dispositif désactivé, le secteur isolé du puits de forage est rouvert pour permettre l'accès à la colonne de production.

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