Two-dimensional hydraulic fracture simulators are used to design the majority of hydraulic fracture treatments in West Texas. These models assume a fixed hydraulic fracture height. In many cases, hydraulic fracture treatments often do not stay confined within a fixed height as the two dimensional models assume. In the Spraberry/Dean siltstones of West Texas there are no strong barriers to vertical fracture migration, and two dimensional models are clearly inappropriate. Three dimensional hydraulic fracturing simulators overcome this limitation of a fixed height by calculating the fracture height. The inputs required are considerably more involved, and the 3D models require data from both the pay sands and boundary layers. If the raw input data are not available or if sufficient engineering effort is not invested the model output may be misleading. Wireline logs can provide valuable inputs to these three dimensional simulators. These inputs will be discussed, along with case studies where the inputs helped optimize the completion design.

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