Fracturing method for subterranean reservoirs

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01) E21B 43/267 (2006.01)

Patent

CA 2725305

A method of creating multiple fractures in a well traversing a formation is described using pressurized fluids in a highly deviated or horizontal section of the well at a pressure above the fracturing pressure of the formation, wherein for creating a fracture the pressurized fluid is alternated between an acid fracturing fluid and a proppant loaded fluid, such that the proppant blocks the flow of pressurized fluid into a fracture created during a previous step of the method and the subsequently pressurized acid fracturing fluid creates a new fracture at a location along the highly deviated or horizontal section different from the location of the previously created fracture. Image

L'invention ci-décrite concerne un procédé destiné à créer des fractures multiples dans un puits traversant une formation à laide de fluides sous pression dans une section fortement déviée ou horizontale du puits à une pression supérieure à la pression de fracturation de la formation, en faisant alterner, afin de créer une fracture, le fluide sous pression entre un fluide de fracturation acide et un fluide chargé dagent de soutènement, de telle sorte que lagent de soutènement bloque lécoulement de fluide sous pression  dans une fracture créée lors dune étape précédente du procédé et que le fluide de fracturation acide sous pression qui suit crée une nouvelle fracture à un emplacement situé le long de la section fortement déviée ou horizontale et différent de lemplacement de la fracture créée précédemment.

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