A new 3D hydraulic-fracturing simulator, GEOFRAC, is described that implicitly couples the solution of the fracture boundary movements with that of the fluid pressure and fracture width profiles over the fracture face. Results obtained with the new simulator are shown to be strictly consistent with its underlying assumptions for a simple case - a condition that may not always be true for the results of commercially available simulators. This difference in the results is shown to relate to the improved numerical procedures that have been implemented in the new simulator.

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