Oil & Gas Science and Technology

https://ogst.ifpenergiesnouvelles.fr/

List of Papers (Total 616)

Experimental Study and Mathematical Modeling of Asphaltene Deposition Mechanism in Core Samples

In this work, experimental studies were conducted to determine the effect of asphaltene deposition on the permeability reduction and porosity reduction of carbonate, sandstone and dolomite rock samples using an Iranian bottom hole live oil sample which is close to reservoir conditions, whereas in the majority of previous work, a mixture of recombined oil (a mixture of dead oil...

Modeling of 1D Anomalous Diffusion in Fractured Nanoporous Media

Fractured nanoporous reservoirs include multi-scale and discontinuous fractures coupled with a complex nanoporous matrix. Such systems cannot be described by the conventional dual-porosity (or multi-porosity) idealizations due to the presence of different flow mechanisms at multiple scales. More detailed modeling approaches, such as Discrete Fracture Network (DFN) models...

Rheophysics of Lamellar Phases

We have developed several techniques to study the effect of shear on complex fluids. These techniques are based on shear cells specially adapted to scattering techniques or transport properties. A brief description of the cells will be given together with the results that can be obtained using these techniques. Exemples on lyotropic systems will be detailed. The effect of shear...

Reversible Thermoassociation of Water-Soluble Polymers

In various industrial fields, water soluble polymers are commonly used as thickening agents to control the reology of aqueous fluids. Nevertheless, their properties are weakened as the temperature increases. In order to overcome this problem, the concept of thermoassociativewater soluble polymers was developed. Such new amphilic systems can be obtained by grafting on an...

Prediction of Volumetric Properties and (Multi-) Phase Behaviour of Asphaltenic Crudes

Asphaltenes flocculation is described as a thermodynamic transition inducing the formation of a new liquid phase with a high asphaltenic content; this phase being the asphaltenic deposit. The thermodynamic model selected is the Peng-Robinson Equation of State associated with the Abdoul and Péneloux group contribution mixing rules. The oil is modeled by 33 pseudocomponents. Mainly...

Kelvin Notation for Stabilizing Elastic-Constant Inversion

Inverting a set of core-sample traveltime measurements for a complete set of 21 elastic constants is a difficult problem. If the 21 elastic constants are directly used as the inversion parameters, a few bad measurements or an unfortunate starting guess may result in the inversion converging to a physically impossible solution . Even given perfect data, multiple solutions may...

Combustion Modeling with the G-Equation

Numerical investigations concerning the turbulent flame front propagation in Gasoline Direct Injection (GDI) engines were made by implementing a flamelet model in the CFD code Fire. The advantage of this combustion model is the decoupling of the chemistry from the turbulent flow. For this purpose the combustion chamber has to be divided into a burned and an unburned area, which...

Synthetic Or Reformulated Fuels: a Challenge for Catalysis

Despite comparative figures for wordwide crude oil and natural gas proven reserves, present time contribution of syngas chemistry to motorfuels remains marginal when the refining industry is faced to main constraints: market demand evolution, stringent specifications and environmental issues. Actually natural gas upgrading via syngas chemistry yields key products (e. g. methanol...

Poroelasticity and Poroplasticity At Large Strains

This paper reviews some aspects of the formulation of the constitutive behavior of a saturated porous material in isothermal evolutions in the domain of large strains. First, the results concerning the nonporous solid are recalled. Then, the poroelastic and poro-elastoplastic behaviors at large strains are successively considered. When the solid phase is elastic at large strains...

Rock Permeability and Fluid Pressure At the Ktb. Implications from Laboratory-And Drill Hole-Measurements

Rock permeability and the fluid pressure were investigated at different scales at the two drill holes of the Continental Deep Drilling Program (KTB). Drill hole tests and fluid inclusion investigations both implicate the existence of hydrostatic fluid pressure in situ with respect to salinity of the formation fluid. Matrix permeability and in situ values from hydraulic tests...

Methodology for Investigating the Mechanical Strength of Reforming Catalyst Beads

Reforming catalyst beads must exhibit strong resistance to the mechanical and thermal stresses they experience during their lifetime in a continuous regenerative catalytic unit. An inventory of the mechanical stresses, e. g. compressive, impact and shearing, is presented. It shows that a multitest approach must be designed in order to measure the particle strength and then...

Usage of Cfd Modelling for Improving an Fcc Riser Operation

The homogeneity of the regenerated catalyst flow upstream of the feed injectors at the bottom of an industrial FCC (Fluid Catalytic Cracking) riser was thoroughly investigated using several techniques (sampling, temperature and gamma-scan survey). It appeared that marked maldistribution was taking place, due to a bend at the bottom of the riser, which could not be corrected by...

Thermogravimetric Investigation of the Influence of Colloidal Phase on the Processing Properties of Crude Oil Residues

An atmospheric residue, a vacuum residue, a visbreaking residue, the maltene fractions of the residues, mixtures of the atmospheric residue with the vacuum residue and the residue from the supercritical extraction of the vacuum residue as well as residues mixed with dispersing agents were investigated by thermogravimetry at three different heating rates. From that, the activation...

Improvements of Ebullated-Bed Technology for Upgrading Heavy Oils

Residue from heavy crude oils can be upgraded through various existing processes. Among these processes, the catalytic hydroconversion ebullated-bed process (H-Oil) has the unique feature of deeply converting heavy feedstocks with high impurity contents while operating with a long cycle time. This is accomplished through daily on-line catalyst replacement of a small portion of...

A Reappraisal of Energy Supply and Demand in 2050

In this paper dealing with the medium term (2020) and long term (2050) world energy mix the author has attempted to present a single most likely scenario, contrary to the usual multiple scenario approach. A second main characteristic is that the emphasis is not on the uncertainties of energy demand but on the potential limitations on the offer of fossil fuels and mainly of oil...

Fatigue of Drillstring: State of the Art

Failure due to fatigue is a very costly problem in oil and gas industry. Many investigators have previously addressed this problem, but its frequency of occurrence is still excessive. Torque and tension can be correctly predicted but computations of fatigue duration are still approximate. Regarding the fatigue failure of drillstring, this paper summarizes the state of the art...

Analysis of Deformation Measurements for Reservoir Managemen

If reservoir deformation measurements can be analyzed to give consistent and coherent information on the volume changes and shear distortions taking place in the reservoir, data may be used for reservoir management and optimization of production and injection operations. Deformations may be measured at surface or at depth using a variety of technologies with different costs, ease...

Vector Development, Isolation of New Promoters and Enhancement of the Catalytic Activity of the Dsz Enzyme Complex in Rhodococcus Sp. Strains

Rhodococcus is a metabolically versatile genus, commonly found in soils and sea water,markedly solvent tolerant and capable of catalyzing diverse transformation reactions of compounds present in crude oil. Among these, oxidation and catabolism of alkanes and aromatics, sulfur removal from aryl- and alkyl-sulfonates and other organosulfur compounds areuseful characteristics. To...

Influence of Ageing of Polluted Soils on Bioavailability of Phenanthrene

Polycyclic aromatic hydrocarbons (PAH) are aromatic compounds persistent in the environment because of their hydrophobic nature, low water solubility and high adsorption onto soils and sediments. Bacteria can degrade phenanthrene dissolved in water but not when adsorbed onto soil particles. The bioavailability of phenanthrene for bacteria used for pollutant degradation was...

Development of Natural Gas Demonstrator Based on an Urban Vehicle with a Down-Sized Turbocharged Engine

The main objective of this project is to confirm the high efficiency of compressed natural gas (CNG) fuel when used in urban conditions. For this purpose, a demonstrator vehicle using only CNG fuel has been developed when modifying an existing gasoline urban vehicle. The target is to achieve low CO2 emissions with a maximum level of 100 g/km on the motor vehicles emissions group...

Model Based Diagnostic Module for a FCC Pilot Plant

This paper presents a diagnostic module developed by IFP and tested off-line on a FCC (Fluid Catalytic Cracking) pilot plant. The method uses four successive complementary techniques. They enable to go step by step from the observations to a sentence in natural language describing the faults. First, a quantitative causal model is elaborated from a quantitative behavioural model...