Hydraulic fracture initiation and propagation control in...

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01) E21B 33/068 (2006.01) E21B 43/267 (2006.01)

Patent

CA 2675823

A method and apparatus for initiating and propagating a vertical hydraulic fracture in unconsolidated and weakly cemented sediments from a single bore hole to control the fracture initiation plane and propagation of the hydraulic fracture, enabling greater yield and recovery of petroleum fluids from the formation. An injection casing with multiple fracture initiation sections is inserted and grouted into a bore hole. A foam fracture fluid carrying a proppant is injected into the injection casing and opens the fracture initiation sections to dilate the formation in a direction orthogonal to the required fracture azimuth plane. Propagation of the fracture is controlled by limiting the fracture fluid form to that of a stable foam fracturing fluid during the fracturing process. The injection casing initiation section remains open after fracturing providing direct hydraulic connection between the production well bore, the permeable proppant filled fracture and the formation.

La présente invention concerne un procédé et un appareil pour l'initiation et la propagation d'une fracture hydraulique verticale dans des sédiments faiblement consolidés et non consolidés à partir d'un forage unique afin de contrôler le plan d'initiation de la fracture et la propagation de la fracture hydraulique, permettant d'améliorer le rendement et la récupération de fluides de pétrole à partir de la formation. Un tubage d'injection avec de multiples sections d'initiation de fracture est inséré et scellé à l'intérieur d'un forage. Un fluide de fracturation sous forme de mousse transportant un agent de soutènement est injecté à l'intérieur du tubage d'injection et ouvre les sections d'initiation de la fracture afin de dilater la formation en une direction orthogonale au plan azimutal de fracture requis. La propagation de la fracture est contrôlée en limitant la forme du fluide de fracturation à celle d'un fluide de fracturation sous forme de mousse stable pendant le procédé de fracturation. La section d'initiation du tubage d'injection reste ouverte après la fracturation fournissant une connexion hydraulique directe entre le puits de forage de production, la fracture remplie d'un agent de soutènement perméable et la formation.

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