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Abstract

Summary

In tight oil and gas reservoirs, the drainage area per well is relatively small in comparison with conventional reservoirs, so the drilling and stimulation of infill wells is a common practice to accelerate production. However, pressure changes due to production lead to anisotropic changes in the magnitude and orientation of the stresses across the reservoir, and this can affect the fracture geometry on the infill wells. For instance, depletion-induced stress changes have been associated with the development of asymmetric fractures, destructive well interference and production decline ( ). Yet, one could argue that the impact of depletion-induced stress on the geometry of hydraulic fractures would depend on how much the stress field is modified by depletion and on the relative contribution of other variables such as the rock fabric, the in-situ stress anisotropy, the distance among wells and the production time among other variables. To fully plan and optimize the placement of infill wells, the interplay among these variables must be understood. In this paper we give a step in this direction and study, via numerical simulations, the potential scenarios in which asymmetric fractures can develop. The relative weight of two variables is considered: the depletion-induced stress and the rock fabric.

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/content/papers/10.3997/2214-4609.201602351
2016-10-24
2024-04-26

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201602351
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Depletion-induced Stress and Rock Fabric as Controls to Hydraulic Fracture Geometry in Depleted Reservoirs
Conference Proceedings 2016, 1 (2016); https://doi.org/10.3997/2214-4609.201602351
/content/papers/10.3997/2214-4609.201602351
/content/papers/10.3997/2214-4609.201602351
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