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• W4253408824 abstract "A Dual-Grid Automatic History-Matching Technique With Applications to 3D Formation Testing in the Presence of Oil-Based Muds Mayank Malik; Mayank Malik The University of Texas at Austin Search for other works by this author on: This Site Google Scholar Carlos Torres-Verdin; Carlos Torres-Verdin The University of Texas at Austin Search for other works by this author on: This Site Google Scholar Kamy Sepehrnoori Kamy Sepehrnoori The University of Texas at Austin Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Annual Technical Conference and Exhibition, Anaheim, California, U.S.A., November 2007. Paper Number: SPE-109956-MS https://doi.org/10.2118/109956-MS Published: November 11 2007 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Malik, Mayank, Torres-Verdin, Carlos, and Kamy Sepehrnoori. A Dual-Grid Automatic History-Matching Technique With Applications to 3D Formation Testing in the Presence of Oil-Based Muds. Paper presented at the SPE Annual Technical Conference and Exhibition, Anaheim, California, U.S.A., November 2007. doi: https://doi.org/10.2118/109956-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Annual Technical Conference and Exhibition Search Advanced Search AbstractProbe-type formation testers are often used to estimate permeability and permeability anisotropy from pressure transient measurements. The interpretation of these measurements is not trivial in the presence of oil-base mud-filtrate invasion due to miscibility with formation oil and gas. Simple analytical expressions of spherical and linear single-phase flow may not give correct estimates of permeability in miscible or partially miscible flow regimes. A computationally demanding three-dimensional (3D) numerical model is required to provide accurate and reliable estimates of formation properties. Because pressure transients are nonlinearly dependent on the permeability of the formation, repeated 3D numerical simulations are necessary to match the measured pressure transients.We describe the development and successful implementation of a new inversion method that efficiently estimates permeability and permeability anisotropy with a cascade sequence of least-squares minimizations. Measurements consist of pressure transients acquired at the sand face with a probe-type wireline formation tester (WFT). The new inversion method executes the forward 3D problem only in an outer loop. In the inner loop, we perform fast minimizations with an equivalent two-dimensional (2D) cylindrical grid. Transient measurements of pressure at the sand face simulated with the 2D cylindrical grid are correlated to the corresponding measurements simulated with the 3D grid. Once the 2D minimization is completed, we perform a 3D simulation of transient pressure to update the 2D-3D correlation parameter and a new 2D minimization is performed until convergence is reached. The process repeats itself until the simulated 3D pressure transients reproduce the field measurements within pre-stipulated error bounds.We perform tests of the new inversion algorithm on synthetic and field data sets acquired in the presence of oil-base mud-filtrate invasion. Results successfully confirm that our coupled 2D/3D hybrid inversion approach enables significant savings in computer time and provides reliable and accurate estimates of permeability and anisotropy. In most cases, we are able to estimate permeability under 2% error within 20% of the computational time required by 3D minimization. Sensitivity analysis indicates that permeability estimates may be biased by noisy measurements and uncertainty in (a) flow rates, (b) relative permeability, (c) radial extent of invasion, (d) formation damage, and (e) location of bed boundaries. Keywords: Modeling & Simulation, CPU time, relative permeability, Probe, Upstream Oil & Gas, pressure differential, hybrid inversion technique, flow in porous media, radial length, pressure measurement Subjects: Reservoir Fluid Dynamics, Formation Evaluation & Management, Flow in porous media This content is only available via PDF. 2007. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4253408824 title "A Dual-Grid Automatic History-Matching Technique With Applications to 3D Formation Testing in the Presence of Oil-Based Muds" @default.
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