Fracture stimulation process for carbonate reservoirs

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01) C09K 8/66 (2006.01) C09K 8/72 (2006.01)

Patent

CA 2502196

A new process of fracture stimulating a carbonate reservoir in a subterranean formation to stimulate the production of hydrocarbon fluids from the formation is described. During the process, the composition and reactivity of the fracture stimulation fluid that is injected into the formation surrounding a wellbore is varied from a lower reactive fluid to a higher reactive fluid. The process is designed to stimulate the fracture starting from the tip of the fracture and progressing along the fracture back to the wellbore. The reactivity of the fracture stimulation fluid is increased to maintain optimum stimulation conditions for the formation of conductive flow channels along the faces of the fracture. An optimum fracture stimulation efficiency number, Ff , is used (generally integrated into a fracture simulator computer program) to regulate the fluid composition by reactivity and flow rate, based on formation and fluid parameters.

L'invention concerne un processus de stimulation de fracture d'un réservoir de carbonate dans une formation souterraine afin de stimuler la production d'hydrocarbures dans cette formation. Lors du processus, la composition et la réactivité du fluide de stimulation de fracture injecté dans la formation entourant un forage est variée entre un fluide peu réactif et un fluide très réactif. Le processus est conçu afin de stimuler la fracture partant du bout de la fracture et progressant le long du dos de la fracture vers le forage. La réactivité du fluide de stimulation de fracture est augmentée afin de maintenir des conditions optimales de stimulation pour la formation de canaux d'écoulement conducteurs le long des faces de la fracture. On utilise un nombre optimal d'efficacité de stimulation de fracture, F¿f?, (généralement intégré dans un logiciel de simulation de fracture) afin de réguler la composition du fluide par sa réactivité et son débit, en fonction de la formation et des paramètres des fluides.

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