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- W2045343397 abstract "Abstract Out-of-zone fracture growth can lead to inefficient stimulations and the loss of energy and injection fluids to surrounding rock formations. In unconventional shale resource plays, complexity in fracturing and lithology has a profound affect on the success of a completion program. In this paper we discuss the characteristic changes in seismic response associated with two case studies. The first study consists of out-of-zone fracture growth in inter-bedded sequences of shaley sandstone and carbonates. A zipper frac completion program was used on two stacked lateral treatment wells. A consistent stimulation program was utilized over all stages, however, following a shutdown interval of two days, upon re-initiation of the stimulation program, events migrated out-of-zone into the surrounding carbonate layers. These events were characterized by higher stress release values, consistent with the idea that fracturing was taking place in the carbonates and that more energy was required to activate fractures than typically seen in the fracturing of the shales. This suggests that during the shutdown interval, a relaxation in local stress magnitudes resulted in the re-orientation of the principal stresses into more optimal orientations to allow for fracturing within the carbonates. In a second case study, the stimulation of the Muskwa, Otter Park and Evie formations in the Horn River Basin, in Northeast British Columbia, resulted in localized out-of-zone growth for stimulations in all formations. These events were characterized by large stress release values, in contrast to the observed values for surrounding events within each formation. The evidence of high stress release within the formations suggests the activation of a fault that extended well below the target formations. Based on these observations of stress release, we postulate how additional seismic characteristics, such as stress release, can be used to identify out-of-zone growth in real-time." @default.
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- W2045343397 date "2014-10-27" @default.
- W2045343397 modified "2023-10-04" @default.
- W2045343397 title "Utilizing Microseismic Stress Release to Identify Out-of-Zone Fracture Growth" @default.
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- W2045343397 doi "https://doi.org/10.2118/170938-ms" @default.
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