Oil & Gas Science and Technology

https://ogst.ifpenergiesnouvelles.fr/

List of Papers (Total 990)

Optical Engines as Representative Tools in the Development of New Combustion Engine Concepts

Single cylinder optical engines are used for Internal Combustion (IC) engine research as they allow for the application of qualitative and quantitative non-intrusive, diagnostic techniques to study in-cylinder flow, mixing, combustion and emissions phenomena. Such experimental data is not only important for the validation of computational models but can also provide a detailed...

Diesel Lean NOx-Trap Thermal Aging and Performance Evolution Characterization

The work described in this paper focuses on the impact of thermal aging on NOx trap structure and functions. They were evaluated on a Synthetic Gas Bench (SGB) and correlated with the analysis of the structural and chemical evolution of the catalyst. A FTIR Operando study allowed to further analyse the mechanisms occurring on the catalyst surface and highlight the most critical...

A Comprehensive Numerical Study on Effects of Natural Gas Composition on the Operation of an HCCI Engine

Homogeneous Charge Compression Ignition (HCCI) engine is a promising idea to reduce fuel consumption and engine emissions. Natural Gas (NG), usually referred as clean fuel, is an appropriate choice for HCCI engines due to its suitable capability of making homogenous mixture with air. However, varying composition of Natural Gas strongly affects the auto-ignition characteristics of...

A New Multi-Sample EOS Model for the Gas Condensate Phase Behavior Analysis

Equations of State EOS are vastly being used to predict the phase behavior of reservoir fluids. The accuracy of EOS modeling technique over conventional correlation models would benefit an improved property prediction of these fluids. Once the crude oil or gas condensate fluid system has been probably characterized using limited laboratory tests, its PVT behavior under a variety...

A Mechanistic Model for Predicting and Optimising Oil-Sand Flow in Horizontal Wells

Smart well completion technology for sand management is being used more and more in the petroleum industry to increase productivity and cumulative hydrocarbon production over that of classical sand control techniques. While an understanding of the geomechanics aspects of sand production has begun to emerge, predicting and optimising two-phase oil-sand flow performance...

Russian Arctic Petroleum Resources

The Arctic continental shelf is believed to be the area with the highest unexplored potential for oil and gas as well as for unconventional hydrocarbon resources such as gas hydrates. Despite a common view that the Arctic has plentiful of hydrocarbon resources, there are ongoing debates regarding the potential of this region as a future energy supply base. Driving forces for such...

Unconventional Gas Resources in the Paleozoic of Central Europe

Whereas gas production from unconventional reserves has greatly increased over the past decades, there is still a largely unexplored potential in the Paleozoic of Central Europe. For this area, the paper summarizes some important aspects of the geology of tight sandstone gas reservoirs, gas shales and coalbed methane. Tight sandstones with low permeabilities are especially...

Sedimentary Records of Paleogene (Eocene to Lowermost Miocene) Deformations near the Contact between the Carpathian Thrust Belt and Moesia

The kinematic models proposed for the Tertiary evolution of the Romanian Carpathians explain its arcuate shape by the progressive displacement of the upper plate (Tisza-Dacia block) around the western margin and then along the northern margin of Moesia, the latter representing the stable foreland autochthon. The main tectonic events took place in the Eocene when a former nappe...

Impact of the Heat Transfer on the Performance Calculations of Automotive Turbocharger Compressor

Usually, turbochargers used within internal combustion engine simulation software are modelled in an adiabatic manner. However, during our experimental tests we found that this is not necessarily the case. The direct use of the manufacturer’s map is not possible anymore. A simple method which considers the heat transfers is proposed. It is based on experimental tests made on hot...

Spray Atomization Models in Engine Applications, from Correlations to Direct Numerical Simulations

Sprays are among the very main factors of mixture formation and combustion quality in almost every (IC) engine. They are of great importance in pollutant formation and energy efficiency although adequate modeling is still on development. For many applications, validation and calibration of models are still an open question. Therefore, we present an overview of existing models and...

Analytical Solutions and Optimization of the Exo-Irreversible Schmidt Cycle with Imperfect Regeneration for the 3 Classical Types of Stirling Engine

The “old” Stirling engine is one of the most promising multi-heat source engines for the future. Simple and realistic basic models are useful to aid in optimizing a preliminary engine configuration. In addition to new proper analytical solutions for regeneration that dramatically reduce computing time, this study of the Schmidt-Stirling engine cycle is carried out from an...

Modelling of a Spark Ignition Engine for Power-Heat Production Optimization

Spark ignition gas engine is more and more used in order to produce electricity and heat simultaneously. The engine crankshaft drives a synchronous electric generator. The thermal power output is recovered from the engine coolant system and exhaust gas, and is used to produce generally hot water for heating system. In order to have a better adequacy between supply (production of...

A Real-Time Implementable NMPC Output Feedback for a Diesel Engine Air Path

In this paper, an experimental validation of a parameterized Nonlinear Model Predictive Control (NMPC) scheme with a Moving Horizon Observer (MHO) is presented for a Diesel engine air path. The control design based on the parameterized approach leads to a low dimensional optimization problem which makes the proposed controller real-time implementable. An attractive feature of...

System Properties and Control of Turbocharged Diesel Engines with High-and Low-Pressure EGR

An extension of the air-and exhaust-system with a low-pressure EGR has the potential to significantly reduce the NOx emissions. Besides a cooled high-pressure EGR and the turbocharger with variable geometry turbine, the low-pressure EGR introduces an additional degree of freedom to control the cylinder charge. This increasing complexity of the air system can be handled with model...

Nonlinear EGR and VGT Control with Integral Action for Diesel Engines

A nonlinear multivariable control design with integral action is proposed and investigated for control of Exhaust Gas Recirculation (EGR) and Variable Geometry Turbine (VGT) in heavy duty Diesel engines. The main control goal is to regulate oxygen/fuel ratio and intake manifold EGR-fraction, and they are specified in an outer loop. These are chosen as main performance variables...

TDC Offset Estimation from Motored Cylinder Pressure Data based on Heat Release Shaping

Finding the correct Top Dead Center (TDC) offset for an internal combustion engine is harder than it seems. This study introduces a novel method to find the TDC offset based on the simple assumption that the heat loss power through the combustion chamber walls is constant for motored cycles in a narrow Crank Angle interval around TDC. The proposed method uses nonlinear least...

Practical Achievable Performance in Diesel Oxidation Catalyst Temperature Control

This paper proposes a simple control-oriented model for a Diesel Oxidation Catalyst (DOC). This distributed parameter model accounts for spatially distributed heat generation due to oxidation of reductants. It aims at being used in the context of DOC outlet temperature control, which is required during Diesel Particulate Filter (DPF) active regeneration process. The paper focuses...

System Properties and Control of Turbocharged Diesel Engines with High-and Low-Pressure EGR

An extension of the air-and exhaust-system with a low-pressure EGR has the potential to significantly reduce the NOx emissions. Besides a cooled high-pressure EGR and the turbocharger with variable geometry turbine, the low-pressure EGR introduces an additional degree of freedom to control the cylinder charge. This increasing complexity of the air system can be handled with model...

A Dynamic Simulation Strategy for PCCI Combustion Control Design

Subject of this work is a dynamic simulation strategy for PCCI combustion that can be used in closed-loop control development. A detailed multi-zone chemistry model for the high-pressure part of the engine cycle is extended by a mean value model accounting for the gas exchange losses. The resulting stationary model is capable of describing PCCI combustion sufficiently well. It is...

Statistical Reconstruction of Gas Oil Cuts

Gas oil cuts are extremely complex mixtures of several thousands of different chemical species. Consequently, conventional petroleum analyses do not allow to obtain the molecular detail that is required for the development of robust and predictive kinetic models. Recently, two-dimensional Gas Chromatographic techniques (GC2D) have greatly improved the knowledge in the field of...

Experimental Investigation of the Asphaltene Deposition Process during Different Production Schemes

This paper presents the results of asphaltene precipitation and deposition during lean gas injection, CO2 injection and natural depletion in reservoir conditions. In addition, the effect of variations in operating pressure, injection gas concentration and production rate on asphaltene precipitation and deposition were investigated. The severity of asphaltene deposition was found...

Single Event Kinetic Modelling without Explicit Generation of Large Networks: Application to Hydrocracking of Long Paraffins

The single event modelling concept allows developing kinetic models for the simulation of refinery processes. For reaction networks with several hundreds of thousands of species, as is the case for catalytic reforming, rigorous relumping by carbon atom number and branching degree were efficiently employed by assuming chemical equilibrium in each lump. This relumping technique...

Fault Permeability and Strength Evolution Related to Fracturing and Healing Episodic Processes (Years to Millennia): the Role of Pressure Solution

It is well known that fluids flow through faults and fractures but it is also demonstrated that fault zones act as impermeable barriers. Consequently, one must consider that faults are successively open and closed paths for fluids. On the human-activity time scale (years to millennia), studies of the seismic cycle offer the possibility of making a model of such evolution...

Kinetic Modeling of Vacuum Gas Oil Hydrotreatment using a Molecular Reconstruction Approach

Vacuum Gas Oils (VGO) are heavy petroleum cuts (boiling points ranging from 350 to 550 ˚C) that can be transformed into valuable fuels (gasolines, diesels) by fluid catalytic cracking or hydrocracking. Prior to these conversion processes, hydrotreating is required in order to eliminate the impurities in VGOs. The hydrotreatment process enables to meet the environmental...