Method and apparatus for formation damage removal

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 21/16 (2006.01) E21B 34/06 (2006.01) E21B 37/00 (2006.01) E21B 43/25 (2006.01)

Patent

CA 2416116

A method of treating an underground formation that has been penetrated by a well, the well having a wellbore. The method comprising the steps of lowering a valve into the well until the valve is adjacent the formation with the valve being placed to control flow of fluid between the formation and the wellbore, establishing a pressure differential across the valve; and selectively and repeatedly opening and closing the valve to cause cyclical pressure variation in the formation and induce surges of fluid from the formation into the wellbore. Apparatus for carrying out the method is also disclosed. A method of operating a downhole valve is also disclosed. A method of formation evaluation is also disclosed.

Procédé servant à traiter une formation souterraine dans laquelle a pénétré un puits possédant un trou de sondage. Ce procédé consiste à descendre une vanne dans le puits jusqu'à ce que cette vanne soit contiguë à la formation et placée de manière à réguler l'écoulement de liquide entre la formation et le trou de sondage, ce qui crée une différence de pression d'un côté à l'autre de la vanne, puis à ouvrir et à fermer cette vanne, de façon sélective et répétée, afin de provoquer une variation de pression cyclique dans la formation, ainsi que l'écoulement du liquide en vagues depuis la formation jusqu'à l'intérieur du trou de sondage. L'invention concerne également un dispositif servant à mettre ce procédé en application. Elle concerne également un procédé de mise en service d'une vanne en fond de puits. Elle concerne, de plus, un procédé permettant d'évaluer une formation.

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