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68th EAGE Conference and Exhibition incorporating SPE EUROPEC 2006
- Conference date: 12 Jun 2006 - 15 Jun 2006
- Location: Vienna, Austria
- ISBN: 978-90-73781-00-9
- Published: 12 June 2006
461 - 462 of 462 results
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Prediction of Petrophysical Characteristics from Borehole Gas and Drilling Data
Authors G. Tischler, R. Arkalgud and A. HurstSeveral sources of data are available at the well site during drilling operations that have potential for prediction of petrophysical characteristics. Data of particular interest include gas analyses (borehole gas), which conventionally comprises low molecular-weight hydrocarbons (C1 to C3 ± C4 and C5) but more recently may include a wide range of non-organic gases from well-site mass spectrometry, and rate of (bit) penetration (ROP) and the associated drilling exponent. (DXC, defined as R/N = A (W/B)2 where R = rate of penetration, N = revolutions per minute, A = matrix strength, W = weight on bit and B = bit diameter). Because borehole gas, ROP and DXC are available in real time, and at no extra operational expense, their amenability to prediction of petrophysical characteristics is important to establish as by using them it may be possible to produce synthetic wireline logs and/or direct estimates of porosity, saturation and permeability during drilling at the well site.
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True-Amplitude Wide-Angle One-Way Operators and High-Gradient Zones
Authors C. J. Thomson and C. H. ChapmanAccurate one-way wave equations should simulate waveforms with a completeness that is intermediate between ray-based methods and full wave equation finite differences, for an intermediate computational effort. There is a hierarchy of one-way options, including exact coupled forward and backward operators which are mathematically equivalent to the omni-directional parent wave equation. We show numerical results obtained by using an approximate one-way equation with high-accuracy full wave equation finite-difference results, for both reflected and transmitted waves. The effects of lateral gradients in particular are discussed.
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