Showing papers in "Journal of Petroleum Science and Engineering in 2008"

TL;DR: In this article, statistical descriptive analyses were performed taking into account sulphur, vanadium and nickel concentrations in several non-mature crude oil samples collected in the last few years from various Venezuelan and Spanish basins.

TL;DR: In this article, the authors present an existing numerical tool for fracture growth analysis based on coupled fluid flow and structural deformation phenomena and show that if the well orientation and fracture configuration are not compatible with the in-situ stresses, complex fracture growth diminishes the likelihood of success.

TL;DR: In this paper, the authors used two topologically-disordered networks representing a sand pack and Berea sandstone to study the flow in porous media of Ellis and Herschel-Bulkley fluids, which model a large group of time independent non-Newtonian fluids.

TL;DR: In this article, the results of numerical simulations carried out in a centrifugal pump impeller of an electrical submersible pump conveying an air-water mixture were presented, including the impeller head and the relative flow angle at the outlet (β2) as a function of the liquid flow rate, and a sensibility analysis with regard to the Gas-Void Fraction and the bubble diameter was also included.

TL;DR: In this paper, the Coulomb Failure Stress Change (CFS) method was used to assess the fault reactivation tendency resulting from induced stress changes in poroelastic media, and the authors showed that the potential hazards resulting from these injected stress changes are the reactivation of existing faults or fractures, which may breach the hydraulic integrity of the caprocks that bound the reservoir.

TL;DR: In this article, the effect of temperature on chalk compaction is studied both in a static and dynamic way by performing hydrostatic tests by using of standard triaxial cells, and the mechanism for enhanced chemical induced weakening of chalk by seawater is discussed.

TL;DR: In this paper, a numerical code based on a finite difference scheme was developed to simulate two-fluid transient flow in pipelines, i.e. liquid-liquid, gas-gas, or liquid-gas products.

TL;DR: In this paper, the effect of re-injection of seawater and seawater to the North Sea Chalk was studied. But the authors focused on wettability modification, irreversible thermodynamics, and impact on the mechanical strength of the chalk matrix.

TL;DR: In this paper, the effect of brines, containing sulphate and magnesium (found in sea water) and distilled water as initial saturating and flooding fluids, on relative permeability of modified chalk cores by fatty acids to more oil-wet.

TL;DR: In this paper, the effect of five parameters (demulsifying agent concentration, temperature, wash water dilution ratio, settling time and mixing time with wash water) on performance of the desalting/dehydration process was investigated experimentally.

TL;DR: In this paper, a flow and heat transfer model for a crude oil pipeline buried in soil saturated with water during shutdown, where ambient temperature is below the freezing point of water, has been established.

TL;DR: In this paper, the authors used a plotting technique to predict sub-critical flow behavior of gas condensates through wellhead chokes, which can be applied to predict gas flow rates under a wide range of flow conditions.

TL;DR: In this paper, the authors used the Generalized Archie Equation Curve Fitting (GAECF) to determine the tortuosity and cementation factor for selected intervals in a carbonate reservoir.

TL;DR: This work presents a framework to integrate geostatistical modeling and history matching process, where geost atistical images are treated as matching parameters, and the viability of the genetic algorithm and direct search method in the proposed framework are presented.

TL;DR: In this paper, a dual-porosity/dual-permeability model is used to simulate the prevailing co-current and counter-current flow imbibition phenomena of the water-oil displacement process.

TL;DR: In this article, 10 crude oils samples from onshore and offshore Niger delta were characterized based on their biomarkers and isotopic composition by Gas chromatography-Mass Spectrometry and Isotope mass spectrometry.

TL;DR: In this article, three multivariate statistical methods (beta-Bayesian, multinomial logistic regression, and discriminant analysis) are examined using log and facies data from a western African sandstone reservoir.

TL;DR: In this article, a Partial Least Squares (PLS) method was applied to the Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) spectra of mineral mixtures, quarry sandstones and oilfield reservoir rocks.

TL;DR: In this paper, dimensionless groups using inspectional analysis for the miscible displacement in fractured porous media when there is flow through fracture were derived. And a new dimensionless group, Matrix-Fracture Diffusion Number (N M-FD ), was proposed for better defining the effectiveness of the process.

TL;DR: In this paper, the authors developed a unified model for predicting the pressure wave speeds for two-phase flow in long-distance pipelines based on the hyperbolic two-fluid model.

TL;DR: Oosthuizen et al. as discussed by the authors presented new procedures, similarly to the TDS technique, for analyzing transient pressure tests of Bingham non-Newtonian fluids for horizontal wells.

TL;DR: In this article, the effect of anisotropy on mechanical properties within two outcrop chalks is studied by drilling samples horizontally and vertically from the same chalk block, and the results showed that all mechanical properties, except permeability and tensile strength, displayed anisotropic behaviour.

TL;DR: In this paper, a 3D model map of the Tuzgolu Basin is presented and the most important and deepest part of the basin is located 30-35 km to the southeast of the Aksaray city center.

TL;DR: In this paper, a novel inversion algorithm for the in-situ petrophysical evaluation of hydrocarbon-bearing formations is presented. Butts et al. introduced a novel algorithm for inversion of petrophysics data, which simultaneously honors a set of multi-physics data: (a) pressure-transient, flowline fractional flow, and salt production rate measurements as a function of time acquired with a wireline- conveyed, dualpacker formation tester, and (b) borehole array induction measurements.

TL;DR: In this paper, the inverse procedure for history matching is achieved with an iterative process of successive co-simulations of reservoir characteristics in order to minimize an objective function of dynamic responses.

TL;DR: In this paper, a novel response surface method for characterizing the flow and its uncertainty in hydrocarbon reservoirs is developed, which combines conventional flow simulation results with secondary information provided by fast alternatives such as connectivity measurements, single phase tracer or streamline simulation.

TL;DR: In this article, a simulation study of the VAPEX process was made on a fractured model, which consists of a matrix surrounded by horizontal and vertical fractures, and the results showed a very interesting difference in the pattern of solvent flow in fractured model compared with the conventional model.

TL;DR: In this article, a theoretical analysis on the influence of confining and pore pressures on the deviatoric strength of shale is presented, and a model to predict pore pressure distribution within shale samples during a typical triaxial compression test is developed.

TL;DR: In this article, the sensitivity of core intergranular permeability to applied hydrostatic stress has been quantified through third-order polynomial fits to data from three loosely-to-moderately-consolidated sandstone formations from the same geological system.

TL;DR: In this article, the authors proposed a method to prolong the life of thermal recovery well's casing by using a half warm-up procedure. But, the results showed that the casing deforms when stresses exceed the yield point of its material.