Fluid Characterization of an Iranian Carbonate Oil Reservoir Using Different PVT Packages

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractPrecise and accurate characterization of a reservoir fluid is a very important factor in reservoir simulation studies. PVT experiments are usually expensive and performed in limited conditions. Therefore Computer EOS based PVT packages are used widely for the prediction and evaluation of fluid properties at reservoir, well and surface conditions over a wide range of temperature, pressure and composition 1,2,3,4 . In this work different PVT packages that are available in National Iranian Oil Company (NIOC) have been used to complete fluid analysis and experiment simulation of an Iranian oil reservoir and PVT model preparation for the reservoir simulators. This reservoir is a medium size, highly fractured carbonate reservoir located in southwest of Iran. The carbonate formation has dense matrix with improved permeability by presence of fracture network. This reservoir was initially highly undersaturated and after 5 years of oil production the oil pressure reached to the saturation pressure and gas injection was started into the reservoir 5 .In this work different equation of states, different regression methods and correlations were analyzed for the prediction of fluid properties. Considering the results of this work in general good agreement was obtained for the experimental and calculated data for used packages. However, the method used for tuning the equation of states is critical in getting good agreement.

Correlations for Optimum Separation Pressures for Sequential Field Separation System

“…Some relationships and many modern numerical methods have been implemented to perform flash calculation and subsequently the required fluid properties. The optimum stages pressures and their objective functions are predicted by OSPR model (1) which employs Constrained Rosenbrock (1,2) multivariable search technique besides the same equation of stat, relationships and numerical methods that used with SFPR model (1) . .…”

“…The prediction of phase behavior and fluid properties of hydrocarbon systems is important in several cases as aspects of the petroleum industry (2) . The optimization of separators pressures is one of these aspects because the determination of optimum separators pressures has been achieved by the calculations of the corresponding fluid properties at the pressure used during the optimization process.…”

“…In recent years, Peng -Robinson equation of state (4) and Soave -Redlich -Kwong equation of state (5) have been commonly used in the petroleum industry for predicting the phase behavior and volumetric properties of hydrocarbon fluid mixtures (2,6) .…”

A Semi-Analytical Method for Simulating Two-Phase Flow Performance of Horizontal Volatile Oil Wells in Fractured Carbonate Reservoirs

“…With the degree of deepening exploration and adoption of advanced technology, the exploitation of fractured carbonate volatile oil reservoirs has been attracting considerable attention in recent years [1][2][3][4]. Meanwhile, the application of horizontal wells not only increases the drainage area but also enhances production of a single well.…”