Notional Field Development Final Report - EBN

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EBN Notional Field Development Plan Figure 3-12, Resulting Similar Planar Fracture Geometry for both 20/40 & 30/50 Fracture Treatments, Aalburg Shale Figure 3-13, Representative 3D Planar Fracture Geometry, Aalburg Shale © 2011 Halliburton All Rights Reserved 32
EBN Notional Field Development Plan 3.2.3 Discrete Modeling Scenario Most conventional fracture treatments result in bi-wing fractures. However, some naturally fractured coal and shale formations have geomechanical properties that allow hydraulically induced discrete fractures to initiate, propagate and create complex fracture networks, modeled discretely. Discrete Fracture Network (DFN) modeling is based on a methodology similar to that presented by Warren and Root (1963) for dual porosity naturally fractured reservoirs and Meyer et. al (2010) in SPE 140514. The discrete fracture network may be composed of secondary fractures in all three principal planes. The discrete fractures created in the x-z (major axis) and y-z (minor axis) planes are vertical, while the induced fractures created in the x-y plane are horizontal. The spacing in the x-z, y-z, and x-y planes are ∆ y , ∆ x , and ∆ z , respectively. The Preliminary Discrete Fracture Network Model Summary with two sizes of proppant is shown in Table 3-6, Preliminary DFM Fracture Model Summary (σ2> σ3, average for two networks), Posidonia shale below. Table 3-6, Preliminary DFM Fracture Model Summary (σ 2 > σ 3 , average for two networks), Posidonia shale 20/40-mesh RC proppant 30/50-mesh RC proppant • Efficiency, h = 75% • Efficiency, h = 75% • DPnet = 45.3 bar (657 psi) • DPnet = 45.7 bar (662 psi) • hf = 39 m (128 ft) • hf = 39 m (128 ft) • xf create = 205.2 m (673 ft) • xf create = 205.5 m (674 ft) • xf prop = 152.4 m (500 ft) • xf prop = 152.95 m (502 ft) • wf prop = 0.32 cm (0.12 in) • wf prop = 0.32 cm (0.12 in) • kfwf = 56.3 mD-m (184.7 mD-ft) • kfwf = 28.3 mD-m (92.8 mD-ft) • CfD = 7390 • CfD = 3699 • Network Width: ~35 m (~115 ft) • Network Width: ~35 m (~115 ft) With the Discrete Fracture Network the length of the single wing fracture remains the same for both sizes of proppant. The DFN geometry can be seen in Figure 3-14, Resulting Similar Discrete Fracture Model Geometry (20/40 & 30/50 Fracture Treatment), Posidonia Shale. © 2011 Halliburton All Rights Reserved 33
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