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- W2042606554 abstract "Abstract We describe the development and successful testing of an axial-symmetric simulation algorithm that couples geomechanical deformation with pressure-transient analysis in a stressed vertical borehole. The objective is to quantify the sensitivity of two-phase flow properties of unconsolidated clastic sediments to presence of wellbore stress. We consider the situation in which the mechanically stressed rock formations are probed with a dual-packer formation tester to assess petrophysical properties. The simulation takes into account the mechanical deformation of the rock due to in-situ stresses as well as by wellbore stress imposed by overbalance mud circulation and by the dual-packer itself. Mechanical deformation of the compressible rock causes variations of the porosity and permeability in the near-wellbore region that are evidenced by the pressure transients measured with the dualpacker pressure probes. The processes of multi-phase flow in the near-wellbore region due to mud-filtrate invasion and fluid pumpout are simulated with an IMPES finite-difference formulation that assumes axial-symmetric petrophysical properties and fluid distributions around the axis of a vertical borehole. On the other hand, mechanical deformation is simulated with a finite-element code that assumes 2D axial-symmetric linear deformation. The latter simulator assumes a pre-stressed initial condition due to mud overbalance and computes the incremental deformation due to fluid pumpout with the formation tester. Coupling of mechanical deformation with porosity and permeability assumes a staggered-in-time loosely coupled volumetric model that is enforced by the time-marching IMPES formulation. Sensitivity studies for the case of unconsolidated clastic formations indicate that relative variations as high as 15% in porosity and as high as 13% in permeability can ensue in the near-wellbore region due to overbalance mud pressures of 700 psi and wellbore pressures of 6500 psi applied by the inflatable packers. Such spatial variations of petrophysical properties can significantly bias the corresponding pressure-transient measurements performed with the dual-packer formation tester." @default.
- W2042606554 created "2016-06-24" @default.
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- W2042606554 date "2006-09-24" @default.
- W2042606554 modified "2023-10-17" @default.
- W2042606554 title "Coupled Pressure-Transient Behavior and Geomechanical Deformation in the Near-Borehole Region of Unconsolidated Clastic Rock Formations" @default.
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- W2042606554 doi "https://doi.org/10.2118/102904-ms" @default.
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