Method for hydraulic fracturing of subterranean formation

E - Fixed Constructions – 21 – B

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E21B 43/267 (2006.01)

Patent

CA 2640359

The invention provides economically effective methods for hydraulic fracturing a subterranean formation that ensure improvement of the hydraulic fractureconductivity because of forming strong proppant clusters uniformly placed in the fracture throughout its length. One of these methods comprises: a first stage that involves injection into a borehole of fracturing fluid containing thickeners to create a fracture in the formation; and a second stage that involves periodic introduction of proppant into the injected fracturing fluid to supply the proppant into a created fracture, to form proppant clusters within the fracture to prevent fracture closure and channels for flowing formation fluids between the clusters, wherein the second stage or its sub-stages involve additional introduction of either a reinforcing or consolidation material or both, thus increasing the strength of the proppant clusters formed into the fracture fluid.

L~invention concerne des procédés économiques de fracturation hydraulique d~une formation souterraine permettant d~améliorer la conductivité hydraulique des fractures grâce à la formation d~agrégats d~agent de soutènement solides uniformément répartis sur toute la longueur des fractures. L~un des procédés comprend : une première étape consistant à injecter dans un puits de forage un fluide de fracturation contenant des agents épaississants pour créer une fracture dans la formation ; et une deuxième étape consistant à introduire périodiquement un agent de soutènement dans le fluide de fracturation injecté pour l~amener dans la fracture créée de manière à y former des agrégats d~agent de soutènement empêchant la fracture de se refermer et des passages permettant l~écoulement des fluides de la formation entre les agrégats. Le procédé est caractérisé en ce que la deuxième étape ou ses étapes secondaires consiste(nt) à introduire en outre une matière de renforcement et/ou de consolidation, de manière à accroître la solidité des agrégats d~agent de soutènement formés dans le fluide de fracturation.

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