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Friction 2024年第8期12卷 1785-1800页

作者： Javier BLANCO-RODRÍGUEZ Jacobo PORTEIRO JoséA.LÓPEZ-CAMPOS MartíCORTADA-GARCÍA Silvia FERNÁNDEZ-CASTEJÓN CINTECX Universidade de VigoLagoas-Marcosende s/nVigo 36310Spain repsol SA MadridSpain

Durability and reliability have been studied for decades through intensive trial-error ***,there are numerous fields of application where the costs associated with this approach are not *** lubricated machines with severe dynamic loads,such as high-power-density engines,simulation tools offer clear advantages over intensive *** and multiple scenarios can be cost-effectively simulated to assess different lubricants and engine *** work presented here details the study of wear based on a validated elastohydrodynamic(EHD)simulation model of the connecting rod journal *** model accounts for elastic deformation through a connecting rod finite element model(FEM).In addition,multiple lubricant rheological and tribological dependences,determined by specific experimental tests,are applied in the model through their interaction with the simulation ***,a novel wear algorithm is proposed to predict wear depth over time evolution along a proposed wear cycle based on the typical working ranges of high-performance engines.A final assessment is presented to compare 4 different ultralow-viscosity lubricants in their protective performance under severe *** results show the evolution of the wear load and wear depth over the wear *** evaluation is key to describing a lubricant selection procedure for high-power-density engines.

关键词： wear modelling finite element modelling mixed lubrication elastohydrodynamic(EHD) internal combustion engines bearings

An improved model for severe slugging stability criteria in offshore pipeline-riser systems

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Petroleum Research 2022年第3期7卷 318-328页

作者： Adesina Fadairo Chinemerem Obi Kegang Ling Vamegh Rasouli Olumuyiwa Aboaba Olumide Gbadamosi Department of Petroleum Engineering University of North DakotaUnited States Department of Petroleum Engineering University of Texas A&MUnited States Schlumberger Oifield Services Nigeria repsol NorgeAs Norway

Flow assurance has been a major challenge in petroleum production systems especially in offshore operations where severe slugging is a dominant aching *** is characterized by pulsating flow behavior which impacts the reservoir productivity,pipeline-riser systems,and surface facilities(separator).The only means so far,of delivering reservoir fluids from offshore wells to the separator at the surface is by pipeline-riser systems where slugging is most prominent and oftentimes *** passive and active measures have been deployed over time to mitigate the associated problem,there is the need to develop a predictive tool for mitigating offshore slugging in the riser *** study involves the use of a model and analysis approach to eliminate severe slugging based on the balance of forces acting on the pipeline-riser *** stability criteria which consider accumulation and frictional pressure drops have been *** current approach is solely physicsdriven,to predict the corresponding liquid and gas velocities at which the fluctuations would be severe when producing multiphase fluids through pipeline-riser *** balancing the forces acting on a riser-pipeline system and accounting for frictional and accumulation effects,two hydraulic flow modeling approaches have been used in this study to improve the criteria for predicting the condition of severe *** developed criteria were computed using MATLAB/Simulink and a severe slugging flow map was ***“new study 1”and“new study 2”showed a 16%and 13%increase respectively in predicted unstable cases than the Malekzadeh *** criteria were tested at different separator *** Taitel and Jansen criteria could not predict severe slugging at elevated separator ***,the developed flow maps using the“new study 1”are more reliable than the“new study 2”.This is because the“new study 2”approach over defines the physics of severe *** cr

关键词： Severeslugging Stability criteria Offshore Pipeline-Riser systems

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20世纪90年代世界巨型油气田发现综述

世界石油工业 2001年第6期8卷 38-41页

作者： Pett.,HS 西班牙repsol公司

Reservoir stress path and induced seismic anisotropy： results from linking coupled fluid-flow/geomechanical simulation with seismic modelling

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Petroleum Science 2016年第4期13卷 669-684页

作者： D.A.Angus Q.J.Fisher J.M.Segura J.P.Verdon J.-M.Kendall M.Dutko A.J.L.Crook School of Earth and Environment University of LeedsLeeds UK Formerly School of Earth and Environment University of Leeds Leeds UK Department of Earth Sciences University of Bristol BristolUK Rockfield Software Ltd. Swansea UK Three Cliffs Geomechanics Swansea UK repsol Madrid Spain ESG Solutions Kingston Canada

We present a workflow linking coupled fluid-flow and geomechanical simulation with seismic modelling to predict seismic anisotropy induced by non-hydrostatic stress changes. We generate seismic models from coupled simulations to examine the relationship between reservoir geometry, stress path and seismic anisotropy. The results indicate that geometry influences the evolution of stress,which leads to stress-induced seismic anisotropy. Although stress anisotropy is high for the small reservoir, the effect of stress arching and the ability of the side-burden to support the excess load limit the overall change in effective stress and hence seismic anisotropy. For the extensive reservoir, stress anisotropy and induced seismic anisotropy are high. The extensive and elongate reservoirs experience significant compaction, where the inefficiency of the developed stress arching in the side-burden cannot support the excess *** elongate reservoir displays significant stress asymmetry,with seismic anisotropy developing predominantly along the long-edge of the reservoir. We show that the link betweenstress path parameters and seismic anisotropy is complex,where the anisotropic symmetry is controlled not only by model geometry but also the nonlinear rock physics model used. Nevertheless, a workflow has been developed to model seismic anisotropy induced by non-hydrostatic stress changes, allowing field observations of anisotropy to be linked with geomechanical models.

关键词： Coupled fluid-flow/geomechanics Reservoir characterization Seismic anisotropy Stress path

Tomographic inversion for microseismic source parameters in mining

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Applied Geophysics 2012年第3期9卷 341-348,362页

作者：缪华祥姜福兴宋雪娟杨淑华焦俊如北京科技大学中国石油勘探开发研究院 repsol USA The WoodlandsTexas 77380USA

We propose a new method for inverting source function of microseismic event induced in mining. The observed data from microseismic monitoring during mining are represented by a wave equation in a spherical coordinate system and then the data are transformed from the time-space domain to the time-slowness domain based on tomographic principle, from whichwe can obtain the signals related to the source in the time-slowness domain. Through analyzing the relationship between the signal located at the maximum energy and the source function, we derive the tomographic equations to compute the source function from the signals and to calculate the effective radiated energy based on the source function. Moreover, we fit the real amplitude spectrum of the source function computed from the observed data into the co-2 model based on the least squares principle and determine the zero-frequency level spectrum and the corner frequency, finally, the source rupture radius of the event is calculated and The synthetic and field examples demonstrate that the proposed tomographic inversion methods are reliable and efficient

关键词： Tomographic image microseismic event source function source spectrum the time-slowness domain

Geomechanical modelling of cold heavy oil production with sand

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Petroleum 2022年第1期8卷 66-83页

作者： Assef Mohamad-Hussein Pablo Enrique Vargas Mendoza Paolo Francesco Delbosco Claudia Sorgi Vincenzo De Gennaro Surej Kumar Subbiah Qinglai Ni Jose Maria Segura Serra MRLakshmikantha Jos Alvarellos Iglesias Rebecca Daniels Schlumberger Geomechanics Center of Excellence Gatwick AirportUnited Kingdom Schlumberger Calle Alvarez de Baena 4Planta Baja28006MadridSpain Schlumberger Av.A.NobelZI NordPau64000France Schlumberger 45th Floor Tornado TowerWest BayMajlis Al TaawonDohaQatar repsol Technology Center MostolesMadridSpain

The contribution of geomechanics to provide a rigorous quantification of porosity changes and associated permeability changes is often neglected when considering hydrocarbon ***,it often has significant effects on production rates and ultimate *** the cold heavy oil production with sand(CHOPS)technique,geomechanics is the key for reservoir simulations and promoting successful *** fact,the technique employed in CHOPS significantly affects the stress state within the reservoir by inducing“on-purpose”formation *** is not only vital to comprehend the behaviour of the reservoir during production,but it is crucial to identify how to harness that behaviour to improve *** order to simulate the mechanical behaviour of unconsolidated sand material,an elastoplastic damage model was ***-flow-geomechanical modelling was then performed for predicting individual well behaviour and overall field *** combined effect of fluid-flow and geomechanics improved predictions with respect to oil,water,and gas production rates at key *** rates matched satisfactorily most of the *** addition,the onset and propagation of equivalent wormhole networks were quantified throughout the production *** enabled quantification of the volume of produced sand at individual *** comparisons between the measured and simulated sand volume rate at well locations showed reasonable *** calibrated models can then be used for the placement of new wells to optimize production.

关键词： CHOPS Numerical simulation Sanding Geomechanics

Self-Organizing Maps in Seismic Image Segmentation

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Computer Technology and Application 2012年第9期3卷 624-629页

作者： Carlos Ramirez Miguel Argaez Pablo Guiilen Gladys Gonzalez Program in Computational Science The University of Texas at El Paso El Paso Texas 79968 United States Geophysics Research and Development Repsol USA the Woodlands Texas 77380 United States

Unsupervised neural networks such as the Kohonen Self-Organizing Maps （SOM） have been widely used for searching natural clusters in multidimensional and massive data. One example where the data available for analysis can be extremely large is seismic interpretation for hydrocarbon exploration. In order to assist the interpreter in identifying characteristics of interest confined in the seismic data, the authors present a set of data attributes that can be used to train a SOM in such a way that zones of interest can be automatically identified or segmented, reducing time in the interpretation process. The authors show how to associate SOM to 2D color maps to visually identify the clustering structure of the input seismic data, and apply the proposed technique to a 2D synthetic seismic dataset of salt structures.

关键词： Self-organizing maps image segmentation seismic attributes.

Automatically positioning microseismic sources in mining by the stereo tomographic method using full wavefields

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Applied Geophysics 2012年第2期9卷 168-176,234,235页

作者：缪华祥姜福兴宋雪娟宋建勇杨淑华焦俊如北京科技大学土木与环境工程学院中国石油勘探开发研究院地球物理研究所 repsol USA The WoodlandTexas77380USA

For microseisimic monitoring it is difficult to determine wave modes and their propagation velocity. In this paper, we propose a new method for automatically inverting in real time the source characteristics of microseismic events in mine engineering without wave mode identification and velocities. Based on the wave equation in a spherical coordinate system, we derive a tomographic imaging equation and formulate a scanning parameter selection criterion by which the microseisimic event maximum energy and corresponding parameters can be determined. By determining the maximum energy positions inside a given risk district, we can indentify microseismic events inside or outside the risk districts. The synthetic and field examples demonstrate that the proposed tomographic imaging method can automatically position microseismic events by only knowing the risk district dimensions and range of velocities without identifying the wavefield modes and accurate velocities. Therefore, the new method utilizes the full wavefields to automatically monitor microseismic events.

关键词： microseismic full wavefields wavefield mode identification tomographic image source parameters automatic positioning