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- W2058873889 abstract "The interpretation of borehole breakouts suggests that minimum horizontal stress (σh) Is regionally oriented approximately N-S in the Barrow-Dampier Sub-Basin. More locally, breakout interpretation suggests that σh orientation is 005°-010° in the Wanaea/Cossack area, and 012°-022° in the Griffin/Chinook/Scindian area. Horizontal stress magnitudes in the Wanaea/Cossack area, derived from modified leak-off tests, together with vertical stress magnitudes derived from density and sonic log data, suggest that the stress (fault) regime in the Wanaea/Cossack area is on the boundary of extension (normal faulting) and strike-slip.The contemporary stress field impacts on planning the drilling direction of deviated and horizontal wells through the issues of mechanical wellbore stability and fracture intersection. In order to maximise intersection with any open, natural fractures, and to optimise any hydraulic fracturing program, wellbores should be horizontal and parallel to σh (minimum horizontal compressive stress) in the extensional (normal fault) and strike-slip stress regimes, and vertical in the compressional (reverse fault) regime. In order to minimise the tendency for borehole breakout, the stress anisotropy around the wellbore should be minimised — i.e. horizontal wells should be drilled in the direction of σh in the extensional regime, and in the direction of σH (maximum horizontal compressive stress) in the compressional regime. In the strike-slip regime, horizontal wells can be oriented such that they are not subject to any stess anisotropy by progressively changing from the σh direction towards the σH direction as the horizontal stresses increase with respect to the vertical.In the Wanaea/Cossack area, wells drilled towards 005°-010° or 185°-190° will maximise the potential for intersection with open, natural fractures (should they be present), and recovery from any induced, hydraulic fracturing will be optimised. Furthermore, wells in this direction will be subject to the minimum stress anisotropy, and are thus least likely to be subject to breakout." @default.
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- W2058873889 date "1993-09-01" @default.
- W2058873889 modified "2023-10-06" @default.
- W2058873889 title "The Contemporary Stress Field of the Barrow-Dampier Sub-Basin and Its Implications for Horizontal Drilling" @default.
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- W2058873889 doi "https://doi.org/10.1071/eg993567" @default.
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