Hydraulic fracture initiation and propagation control in...

E - Fixed Constructions – 21 – B

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E21B 47/00 (2006.01)

Patent

CA 2647324

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 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 injection rate during fracture initiation and propagation and maintaining a minimum fracture fluid viscosity. 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.

L'invention concerne un procédé et un appareil destinés à amorcer et à propager une fracture hydraulique verticale dans des sédiments non consolidés et faiblement cimentés à partir d'un trou de sonde unique afin de contrôler le plan d'amorçage de la fracture et la propagation de la fracture hydraulique, permettant d'augmenter le rendement et le taux de récupération de fluides pétroliers à partir de la formation. Un tubage d'injection comportant des sections multiples d'amorçage de fracturation est inséré et scellé dans un trou de sonde. Un fluide de fracturation entraînant un agent de soutènement est injecté dans le tubage d'injection et ouvre les sections d'amorçage de fracturation pour dilater la formation dans une direction orthogonale au plan azimutal de fracturation souhaité. La propagation de la fracture est contrôlée en limitant le débit d'injection du fluide de fracturation pendant l'amorçage et la propagation de la fracturation, et en maintenant une viscosité minimale du fluide de fracturation. Les sections d'amorçage du tubage d'injection restent ouvertes après la fracturation, assurant une connexion hydraulique directe entre le puits de forage de production, la fracture remplie d'agent de soutènement perméable et la formation.

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