The Experts below are selected from a list of 40146 Experts worldwide ranked by ideXlab platform
Euripides Papamichos - One of the best experts on this subject based on the ideXlab platform.
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Erosion and multiphase flow in porous media: Application to Sand Production
European Journal of Environmental and Civil Engineering, 2010Co-Authors: Euripides PapamichosAbstract:ABSTRACT Experimental results from Sand Production hollow cylinders tests are presented for cavity failure and Sand Production quantification. The effects of important parameters such as the Sandstone class, stress rate, fluid flow rate, and time are presented and show how they influence Sand Production. A model for hydro-mechanical erosion of porous rocks is presented as it is applied to the Sand Production problem in hydrocarbon Production. The model is based on a continuum theory for erosion, which regards the continuum as a three-phase medium and establishes a set of mass balance equations for the various phases. The solution requires an additional equation in the form of a constitutive or evolution law for the Sand rate. Erosion is coupled with the mechanical behavior of a Sand-producing cavity, and leads to enlargement of the erosion zone. Finally, multiphase flow and its effect on Sand Production is presented experimentally and theoretically by analyzing water invasion in the Sand Production test.
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The Variable Rate of Sand Production Captured by an Analytical Model
Proceedings of the First Southern Hemisphere International Rock Mechanics Symposium, 2008Co-Authors: Erling Fjaer, Euripides PapamichosAbstract:An analytical model for the rate of Sand Production from cylindrical cavities has been calibrated on laboratory tests, and used for prediction of Sand Production under field-like conditions. The model is based on the assumption that Sand Production is driven by erosion from plastified material around the cavity. The model predicts, in agreement with field observations, that Sand Production may occur in different forms: It may be continuous, at a relatively constant rate; it may be transient, where continuous Production at a declining rate follows a burst of Sand, or it may be catastrophic, where Sand is produced at a very high rate. The predictions are found to vary significantly, depending on rock type, in situ stress and pore pressure conditions, and well pressure and fluid flow rate.
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Sand Production: Physical and experimental evidence
Revue Européenne de Génie Civil, 2006Co-Authors: Euripides PapamichosAbstract:Experimental results and observations from Sand Production hollow cylinders tests are presented both with respect to cavity failure and Sand Production initiation but also with respect to Sand quantification. The effects of important parameters such as the Sandstone class, the scale effect, and the stress anisotropy are presented and show how they influence Sand Production.
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Sand Production in the statfjord field
Journal of Petroleum Technology, 2006Co-Authors: Marc H. Hettema, Jamie Stuart Andrews, Marit Blaasmo, Euripides PapamichosAbstract:Sand-Production behavior at Statfjord field can be described as controlled by two Sand-Production regimes, one controlled by shear failure and the other controlled by rate. Study results show that Sand Production will limit well Production rates for most formations and that Sand control is needed to ensure high Production rates during the late-life development of the field.
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Sand Production: Mechanical failure or hydrodynamic erosion?
International Journal of Rock Mechanics and Mining Sciences, 1997Co-Authors: Johan Tronvoll, A. Skj˦rstein, Euripides PapamichosAbstract:Abstract The objective of this work was the experimental investigation of Sand Production during hydrocarbon Production in ultra-weak Sandstones, that is Sandstones of uniaxial compressive strength in the range 0–2 MPa. Homogeneous synthetic Sandstone specimens were manufactured through consolidation of Sand mixed with a cementing material. The consolidation and cementation led to a frictional material with low cohesion dominated by plastic behaviour. Synthetic Sandstones of different granulometry were obtained by varying the grain size distribution of the Sand. Physical model experiments of producing cavities were conducted with fluid flowing through the test specimen and escaping through the cavity. The stability limit in terms of critical external stress both related to macroscopic rupture at the cavity surface and initial Sand Production, appears to scale with the average grain size of the rock. In contrast to stronger materials, Sand Production seems to initiate prior to macroscopic failure. Finite Element bifurcation analysis of the experiments demonstrated that the strong compacting behaviour of the material leads to early material softening. In contrast to the experience with more intact Sandstones, classical surface instability associated with rock dilation could not be obtained. It is thus believed that Sand Production in this material is due to hydrodynamic instability of a softened material near the cavity surface.
Tian Hong - One of the best experts on this subject based on the ideXlab platform.
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Development of Prediction Technique of Sand Production Rate in Weak Cementation Sandstone Reservoir
Petroleum Geology & Oilfield Development in Daqing, 2006Co-Authors: Tian HongAbstract:Prediction technique has experienced a process from simple to complex and from qualification to quantification. At present, with the proposing of new techniques of cold Production of heavy oil and Sand Production management , prediction of Sand Production amount in oil and gas well Production process becomes an important problem. This paper illustrates the development of technique of Sand Production mechanism and prediction of Sand Production amount in weak cementation Sand stone reservoir. It divides Sand Production prediction models of oil and gas wells into field engineering method, stress-strain analysis model, earthworm hole model and flow and solid coupling model. It gives the application range of different models and relationship among them, and proposes study direction aiming at disadvantages of each model.
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Laboratory simulation on Sand Production of heavy oil reservoir in Bohai area
Acta Petrologica Sinica, 2005Co-Authors: Tian HongAbstract:A series of laboratory experiments on Sand Production behaviors of heavy oil reservoir in Bohai area were performed under different test conditions. The theoretical models were verified by the tested result of Sand Production. Real time changes of flow rate and Sand Production rate were measured under different injection pressure. The dynamic change of permeability was calculated using Darcy's law. The influences of pressure fluctuation on Sand Production and wormhole formation were analyzed. The experimental results can provide a quantitative base for the determination of proper Sand control measures in field.
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Application of Logging Data in Predicting Sand Production in Offshore Oilfields
Journal of Jianghan Petroleum Institute, 2004Co-Authors: Tian HongAbstract:In the process of prediction and Production of oil and gas wells in Sand-shale stone strata, often because formation is too loose or tested pressure differential is higher than the one that formation can support, serious Sand Production is caused, thus the Sand control liner is packed and blocked by Sand or even the test formation is buried by settled Sand. In order to accurately determine the horizon of Sand Production, the maximum and safety of non-Sand Production pressure differential is quantitatively calculated, based on Biot porous elastic theory and Mohr-Coulomb's criterion of fracture, the logging data of array sonic logging and density logging are used to calculate the in-situ stress distribution around wellbore and perforation, the conditions inducing shear fracture and the calculating formulae for related maximum and safety Production pressure differential are derived, which are successfully used for Sand Production prediction in offshore oilfields.
Ariffin Samsuri - One of the best experts on this subject based on the ideXlab platform.
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The influences of perforation parameters to wellbore instability and Sand Production
Mechanics of Jointed and Faulted Rock, 2018Co-Authors: Ariffin Samsuri, Surej Kumar SubbiahAbstract:This paper presents a series of laboratory experiment had been performed to see the influences of perforation parameter to wellbore instability and Sand Production. Shot density and perforation pattern has been varied for entire laboratory work and the stability test conducted to see the effects on the wellbore stability decreases. Whereas as the perforation pattern changes from spiral to inplane and inline the wellbore stability decreases. The Sand particles produced were found by sieve analysis to be oversized 500 micron. Generally, stable perforated wellbore produced less Sand particle, therefore minimizing the Sand Production problem.
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An integrated simulation model for Sand Production prediction and Sand control
2002Co-Authors: Ariffin Samsuri, S. H. Sim, C. H. TanAbstract:The paper decribes the development of a computer package that can be used to predict Sand Production and select the optimum Sand control. This package consists of two major parts. The first is simulation of perforation stability and onset of Sand Production. This is a coupled mechanical and fluid flow model. The main objectives of this model are predicting the onset of Sand Production, study the effect of perforation patternm, perforation density, phasing angle and 2-phase fluid (oil and water) Production on the perforation cavity stability. The finite element method is used to develop this model. Among the assumptions made were that the reservoir rock surrounding the perforation cavity is assumed isothermal with its pores completely filled with fluid. The oil and water either in perforation cavity or in pores are considered totally immiscible. The deformation condition is considered nonlinear. The perforation boundary that is in contact with cement is assumed to be under no flow and displacement condition. In the events that Sand Production cannot be avoided, gravel packing is normally carried out to prevent the Sand from entering the wellbore. This causes decline in well productivity, which is characterized by the additional pressure drop across the well. The productivity impairment is often aggravated by high-velocity flow. A finite-difference model is developed to evaluate the productivity of gravel-packed wells. This is the second part of the computer package and it represents an improved approach to the study of Production impairment due to gravel-packing compared to the current practice of using the skin concept. In this work, the perforations are treated as cylinders and the annulus between the perforation and screen is filled with gravel.
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Development of Sand Production prediction computer model
2001Co-Authors: Ariffin Samsuri, Soon Hin SimAbstract:During Production, Sand inflow from poorly consolidated reservoir will cause problems of wear, casing collapse and surface facility deterioration. However, if the Sand control completion is used to minimize Sand Production risk, it may lead to high skins and resulting in large productivity loses. On the other hand, completion without Sand control device may lead to Sand Production problems with economial loss and safety risks. The best way to assess the problem is prediction of Sand Production, which basically come from the perforation. Therefore, a two-dimensional numerical model will be developed to simulate and monitor the stability of perforation and predict when Sand will be produced during Production phase. In developing the perforation cavity stability prediction model, the rock is assumed to be isotropic and homogeneous with the pores completely filled with fluid.
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Minimize Sand Production By Controlling Wellbore Geometry And Flow Rate
International Oil and Gas Conference and Exhibition in China, 2000Co-Authors: Ariffin Samsuri, P. V. ChuongAbstract:The Production of Sand particle has become serious problem to oil and gas well and was subject for study during the past years. Basically, Sand Production must be the results of a change in strength of the formation rock due to drilling, perforation and Production operation and drag forces of the produced fluids. Therefore, during designing and developing stages, parameters related to Sand Production need to be examined carefully. This paper presents an experimental study of the effects of wellbore geometry and flow rate to Sand Production and total oil recovery; to minimize Sand Production as well as optimize Production. The experimental works include of static and dynamic Sand Production tests, which were carried out on wellbore models with different wellbore angle, perforation shot density; and perforation pattern and flow rate using Servo Control Compression Testing Machine (SCCTM). The results show that oil Production is reduced as Sand Production increases and most of produced Sand are large size indicating the dominant effects of the breakage of cementing materials. Sand Production increase significantly after effective stress reaches 35-60% of rock compressive strength and followed by the reduction of total oil recovery to 55-73%. In addition, Sand Production increases as wellbore angle, shot density, flow rate increase and as perforation pattern change from spiral to inplane and finally inline, especially for model with more than 10o well bore angle, inline pattern and 1600cc/h flow rate. Therefore, in order to optimize Production, Sand Production must be minized by reducing wellbore angle (
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Effects of wellbore stability to Sand Production
1998Co-Authors: Ariffin Samsuri, Surej Kumar SubbiahAbstract:The paper describe a series of laboratory experiment to observe the effects wellbore stability to Sand Production. The wellbore stability is the most important of aspect that should be considered during and Production activities. The paper will presented only the effect of wellbore stability due the structure design at Production zone i.e. perforated cased wellbore. The physical model has been design as wellbore where different borehole angle and perforation parameter (shot density and perforation pattern) has been impose to see the effect on the stability and Sand Production. Generally all models fail and Sand particles were produced and found that stable perforated wellbore produce less Sand particles.
Babs Oyeneyin - One of the best experts on this subject based on the ideXlab platform.
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Fundamentals of Petrophysics and Geomechanical Aspects of Sand Production Forecast
Developments in Petroleum Science, 2015Co-Authors: Babs OyeneyinAbstract:Abstract Sand Production is one of the major problems facing the oil and gas industry and is common to clastic sedimentary basins throughout the world, affecting thouSands of oil and gas fields. Sand Production is not only a safety hazard for the oil industry but is also a source of revenue loss. This chapter focuses on Sand prediction, which is a term that refers to all the processes leading to the effective quantification of the propensity of a failed reservoir to produce Sand. Sand management, and the decision whether to exclude or accept Sand Production, requires an understanding of the mechanisms that cause Sanding and the development of a field-validated methodology to predict the critical conditions for Sand Production. Any Sand prediction estimation starts with an evaluation of the time to rock failure.
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Sand Production Forecasts for Unconsolidated Gas Reservoirs
Advanced Materials Research, 2009Co-Authors: Babs Oyeneyin, Babatunde MoriwawonAbstract:Development of appropriate strategy for the management of reservoirs with Sanding problems is rather complex and requires an integrated approach to finding the optimum solution to solving the problem. This requires integration of key aspects of reservoir characterisation, drilling, completion and Production technologies including Sand tolerances (Seabed wellhead/flow lines, topside facilities. Providing an accurate forecast of the tolerance depends on accurate prediction of Sand failure and the corresponding volume of produced Sand. This is a transient phenomena further complicated by gas reservoir fluid flow. In this paper the results of a comprehensive Thick Wall Cylinder[TWC] experimental Sand Production studies carried out on synthetic Sandstones are presented. The Sand Production prediction model for liquid flow are further calibrated and upscaled with field data for gas reservoirs. The prediction model developed is further validated with independent field data with good results. The results represent a first for Sand Production forecast for gas reservoirs. Mitigation of Sanding requires reliable Sanding prediction, precise well design, accurate technology selection as well as optimum completion strategy.
Musaed N.j. Al-awad - One of the best experts on this subject based on the ideXlab platform.
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Factors Affecting Sand Production from Unconsolidated Sandstone Saudi Oil and Gas Reservoir
Journal of King Saud University: Engineering Sciences, 2018Co-Authors: Musaed N.j. Al-awad, A.a.h. El-sayed, Saad El-din M. DesoukyAbstract:Abstract In this work a physical model has been constructed to simulate Sand Production from oil and gas reservoirs. The model can accommodate unconsolidated as well as consolidated Sandstone cores. The experiments were designed to investigate the effect of confining pressure, flow rate, and the displacing fluid viscosity on Sand Production mechanism in unconsolidated Sandstone formations. Saline water (3.5% NaCl by weight), light (35° API) and heavy (27° API) crude oils were used as displacing fluids in the tests. The main goal of this study was to examine if controlling of the Production rate alone can solve the problem of Sand Production in a Saudi oil reservoir. The oil reservoir is situated in an unconsolidated Sandstone formation. A produced Sand sample was obtained from this reservoir. Tests were conducted on Sand packs having a similar granulomere distribution to that of the reservoir. The experimental results showed that, the magnitude of Sand Production from the tested porous medium is strongly affected by both flow rate and confining pressure. Sand Production decreases with increasing confining pressure and/or decreasing flow rate. Only very fine particles of the porous medium are produced at high confining pressures. When water, or low viscosity crude oil are saturating the porous medium, Sand Production problem can be managed by controlling the flow rate. In case of saturating the porous medium by heavy crude oil, Sand Production mechanism becomes different and therefore, controlling only the flow rate cannot stop Sand Production. Hence, alternative Sand control measures must be applied to control Sand Production in heavy crude oil reservoirs such as down hole emulsification, gravel packing, screen liners, or down hole consolidation.
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Using Local Gravel to Control Sand Production in a Saudi Oil Field
Journal of King Saud University: Engineering Sciences, 2018Co-Authors: Adel M. Hemeida, Musaed N.j. Al-awadAbstract:Abstract Sand Production from oil and gas reservoirs is most commonly associated with unconsolidated and poorly cemented Sandstones. Sand Production problems are encountered throughout the world and recently are detected in Saudi Arabia. Several techniques could be used to minimize Sand Production such as drawdown control, installing screen liners, applying resin consolidation, gravel packing, etc. This work was conducted to investigate the possibility of using gravel packs made from gravel deposited in the central province of Saudi Arabia. Optimum gravel size, shape, crushing resistance and solubility in acids were tested. The results of the above analysis showed that the selected Saudi gravel properties meet the recommended API requirements. Furthermore, a physical model has been constructed to simulate Sand control process. This model was used to study the effect of drawdown pressure, confining pressure and gravel-pack thickness on rate of fluids and Sand Production in a Saudi oil field. The experimental results showed that Sand and fluid Production are affected by the gravel pack thickness, drawdown pressure and confining pressure. Therefore, it is recommended to utilize the tested Saudi gravel in Sand control applications after performing an economical feasibility study.
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Prediction of Sand Production from a Saudi Sandstone Reservoir
Revue de l'Institut Français du Pétrole, 1997Co-Authors: Musaed N.j. Al-awad, Saad El-din M. DesoukyAbstract:Sand Production is encountered in some Saudi oil fields. Six Sand samples produced from different wells in a Saudi oil reservoir were obtained. Sandstone samples obtained from the same reservoir were subjected to uniaxial and triaxial failure tests. The debris produced from the Sandstone samples and the six Sand samples were characterized for their mineralogy using X-ray diffractometer and grain size distribution using standard sieves. Statistical analyses were employed to check whether a statistical difference between the Sand samples produced from oil wells and debris collected from the failed Sandstone specimens is significant or not. The critical oil rates of the Saudi oil reservoir were also calculated for different well inclination angles. Results show that, no significant statistical difference between the Sand samples and debris exists at a confidence level of 95%. Two obvious failure mechanisms, splitting and shear failure, are responsible for Sand Production from the studied Saudi oil reservoir. The maximum Sand-free Production for the studied oil reservoir range from 960 to 4080 barrels per day.
