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• W2041478746 abstract "Abstract Three new pressure-transient testing methods are employed to determine horizontal and vertical permeability using a dual probe formation tester. Real-time interpretation during acquisition of pressure data, is the focus of all three new pressure-testing techniques. In the first, a new spherical flow model with anisotropy, storage, and skin is developed from first principles for dual probe analysis. Historically, pressure transient solutions are presented as Laplace transforms and approximated in the time domain using numerical techniques. Typically, early, intermediate and late time periods are identified using derivative plots; but very often, the selection of appropriate data results in confusion. Here, the Laplace transform is inverted to yield a single, exact, closed form, analytical, time domain solution valid for all times, making real-time parameter matching possible with high accuracy. The second technique uses an oscillatory displacement source at the piston face, and the phase delay of the pressure pulse between the probes is used to determine permeability and anisotropic index. This technique is particularly useful when the second monitoring probe signal is weak (as in high permeability zones) or where there is large spacing between the probes. Pulse timing can usually be detected more accurately than its magnitude, thus extending the range of permeability and anisotropic measurements. This methodology, which is based on a derived relationship between wave phase and permeability, was developed by mathematical analogy with resistivity determination methods used in induction logging. In the above method, it is often possible to encounter phase wrapping for excessively tight formations, leaving an indeterminate permeability. To circumvent this problem, in the third method, a short, abrupt pulse having a well-defined center frequency is produced at the piston face, and its travel time is measured until arrival at the receiver probes. The harmonic, closed form expression is then used to translate this travel time to permeability. This new method is analogous to sonic wave models; although, of course, waveforms are often smeared due to the diffusive nature of the problem. Simulation results using a detailed finite element, dual probe model are compared against the above analytical methods to assess the effects of near wellbore parameters such as mudcake effectiveness, probe, and packer size. Field-test results are shown to demonstrate the successful implementation of these new testing methods. The three methods described above provide a practical level of redundancy in permeability prediction. Also, monitoring permeability and anisotropy changes while sampling are shown to be beneficial in identifying fluid type changes." @default.
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• W2041478746 date "2000-11-07" @default.
• W2041478746 modified "2023-09-25" @default.
• W2041478746 title "Advanced Dual Probe Formation Tester with Transient, Harmonic, and Pulsed Time-Delay Testing Methods Determines Permeability, Skin, and Anisotropy" @default.
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• W2041478746 doi "https://doi.org/10.2118/64650-ms" @default.
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