Detail Characterization of spatially correlated permeability fields using performance data Bibliografi Author: Al-Qahtani, Mohammed Yahya ; Ershaghi, Iraj (Advisor) Topik: ENGINEERING; PETROLEUM|GEOLOGY Bahasa: (EN )    ISBN: 0-591-11788-6     Penerbit: University of Southern California     Tahun Terbit: 1996     Jenis: Theses - Dissertation Fulltext: 9705064.pdf (0.0B; 0 download) Abstract Because of the underlying dependence of system performance on the permeability field, sufficient signals about the permeability field must exist in the performance data. A systematic examination of parameters affecting correlated permeability fields responses under immiscible fluid injection is presented. The inverse problem is then analyzed whereby from the performance data system parameters can be conditioned. Detailed quantification of the influence of horizontal and vertical correlation lengths on the system effective permeability and recovery factors under waterflood is presented. Reservoirs that are identical in the statistical sense and with similar permeability attributes are shown to exhibit different system effective permeability and production characteristics which could be expressed by an expected value and variance. For reservoirs with different correlation lengths, the expected value and variance are shown to be significantly influenced. The effect of capillary pressure, $P/sb[c],$ on the production characteristics and saturation profiles at different correlation lengths is also investigated. It is observed that neglecting $P/sb[c]$ causes considerable error at large horizontal and short vertical correlation lengths. The effect of using constant as opposed to variable relative permeability attributes is shown to be insignificant regardless of correlation length. The influence of correlation anisotropy for 2-D areal reservoir models is investigated. In fully developed fields under the five-spot waterflood pattern, recognition of anisotropy from performance data is shown to be feasible. For reservoirs with the same anisotropy but different correlation lengths, the influence is similar. This study proposes two methods for incorporating performance data in the image conditioning process using the simulated annealing method. The first method uses the system's effective permeability obtained from the performance data. The second method uses information obtained from the relative onset of successive breakthrough times which are manifested by sudden jumps in the fractional flow curve. These methods are shown to improve the reservoir characterization and history matching processes significantly. Finally, a procedure for estimating the spatial correlation length from performance data is presented. Both the production performance data and the system's effective permeability are shown to help in estimating correlation lengths. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Lihat Sejarah Pengadaan  Konversi Metadata   Kembali

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