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Simulation of fractured reservoirs is an old headache in oil industry, especially for reservoirs located in southern west of Iran. The situation is much more complex when dealing with heavy oil. Most of the simulation results are not reliable due to the many uncertainties in the data related to fractured reservoirs, especially characterizing the fl...
Contexts in source publication
Context 1
... important issue in optimization of number of cell is that the cells near fractures due to harsh changes of saturations and pressures should be very fine. In the Table 4 the optimum number of cells and their sizes are specified. ...Context 2
... selected. The results are compared with simulation results of oil with data reported in both Table 3 and Table 4. ...Context 3
... important issue in optimization of number of cell is that the cells near fractures due to harsh changes of saturations and pressures should be very fine. In the Table 4 the optimum number of cells and their sizes are specified. ...Similar publications
Spontaneous imbibition is an important mechanism for oil recovery in the natural fractured reservoirs. It’s crucial to study the characteristics and influence factors of the imbibition process. We present analytical solutions for the one-dimensional incompressible imbibition process. Based on analytical solution, we study the effect of some factors...
Imbibition oil recovery in low permeability fractured reservoirs has been acknowledged as an efficient method to enhance oil recovery. However, the effects of the complex pore structure and the hydraulic pressure in fracture on the fluids transport were not considered comprehensively in any model at pore scale in literature. This paper aims to stud...
At the conclusion of waterflooding phase, significant volume of oil still remains in reservoir formations. In this paper, waterflooding was performed at a designed sequential rate mode with an aim to further reduce the remaining oil saturation (Sor). Waterflooding process was monitored continuously by a low-field Nuclear Magnetic Resonance (NMR) sp...
Citations
... where r 35 is the pore size corresponding to 35% mercury saturation on mercury intrusion porosimetry curve. Rock quality is one of the main factors affecting capillary-driven displacement (Handy, 1960;Cai et al., 2014;Hamidpour et al., 2015Hamidpour et al., , 2018Abbasi et al., 2017;Harimi et al., 2019). Analyzing spontaneous imbibition experiments may provide information about rock quality (Akin et al., 2000;Roychaudhuri et al., 2013;Hu and Ewing, 2014;Liu et al., 2015;Mirzaei-Paiaman and Saboorian-Jooybari, 2016;Liu, 2017). ...
Determining reservoir quality is vital in order to efficiently produce hydrocarbon and/or inject fluids for secondary/tertiary recovery and carbon sequestration. In this study, we introduce a new approach and present dynamic reservoir quality index (DRQI). A high-quality reservoir would have high displacement (recovery) rate and displaceable (recoverable) saturation of oil. A modified true effective mobility (TEM) function is developed representing displacement rate of oil by an injected fluid (e.g., water or CO2). DRQI is defined as the area under modified TEM curve of oil and includes the well-known reservoir quality index (RQI) as its special case. A large dataset composed of 220 water displacing oil relative permeability experiments, conducted on limestone and dolomite rocks from three Iranian carbonate reservoirs, was used to investigate the potential relationships between DRQI and other reservoir characteristics (e.g., irreducible water saturation, bulk irreducible water, maximum movable oil saturation, and bulk maximum movable oil) as well as quality indicators of RQI, flow zone indicator (FZI), and Winland r35. Results showed that irreducible water saturation and maximum movable oil saturation as well as their bulk variants may not be appropriate for characterizing multiphase quality of reservoirs. Furthermore, the frequently-used single-phase rock quality indicators RQI, FZI, and Winland r35 were not found to be very accurate in characterization of dynamic reservoir quality. DRQI can be used in reservoir simulation studies as a criterion for defining quality maps, and in petrophysical tasks for rock typing and comparing between dynamic qualities (in terms of displacement rate and displaceable saturation of oil) of rock samples.
... Special core analysis (SCAL) is the main method to collect capillary pressure and relative permeability information for reservoir simulation models (Mirzaei-Paiaman et al., 2011, 2017aMirzaei-Paiaman, 2015;Abbasi et al., 2017;Hamidpour et al., 2018). Due to the time-consuming and costly nature of these measurements, conventional or routine core analysis (RCAL) data should be inspected thoroughly to select a representative subset of samples for SCAL stage. ...
Special core analysis (SCAL) measurements play a noteworthy role in reservoir engineering. Due to the time-consuming and costly character of these measurements, routine core analysis (RCAL) data should be inspected thoroughly to select a representative subset of samples for SCAL. There are no comprehensive guidelines on how representative samples should be selected. In this study, a new framework is presented for selection of representative samples for SCAL. The foundation of this framework is using methods of PSRTI, FZI* (FZI-star) and TEM-function for the early estimation of petrophysical static, dynamic, and pseudo-static rock types at RCAL stage. The global hydraulic element (GHE) approach is benefitted and a FZI*-based GHE method (i.e., GHE*) is presented for partitioning data. The framework takes into consideration different laboratory, reservoir engineering, geological, petrophysical and statistical factors. A carbonate reservoir case is presented to support our methodology. We also show that the current forms of Lorenz and Stratigraphic Modified Lorenz Plots in reservoir engineering are not appropriate, and present new forms of them.
