The vertically integrated conservation equations for momentum and mass are solved for a computati... more The vertically integrated conservation equations for momentum and mass are solved for a computational domain that considers the changes in bathymetry due to the longshore sediment transport in the nearshore environment. The model considers the driving forces due to the radiation stress field established by an integrated wave transformation model that includes both refraction and diffraction. For the sediment transport, an energetic approach is implemented that allows various formulations to be tested against field data. The changes in bathymetry are allowed for through local changes in porosity factors that affect both computational cell areas and volume. The solution algorithm used is the SIMPLEST and the iterative method has proved to converge adequately.
A 50 kg. satellite is being developed at the University of Mexico as an engineering test bed. SAT... more A 50 kg. satellite is being developed at the University of Mexico as an engineering test bed. SATEX-l is programmed to be launched to polar orbit early in 1995 by Ariane. The satellite structure comprises aluminum sandwich panels and composites in the form of a cube made with two matting U-shaped parts. This solution was selected for simplicity during assembly and testing. The sIc body is further stiffened by an internal panel which supports a pressurized gas tank and other hardware. All panels are joined by standard comer and edge close-outs and splices. At present, a finite element model for the validation of the design, regarding static and dynamic behaviour is being conducted. The paper presents numerical results for quasi static and dynamic analysis, such as eigen-values, free vibration and sinusoidal vibrations. The testing program follows closely launcher agency requirements and is supported by previous similar experiences in our laboratory. Also,a general description of the project is included.
Oil and gas gathering systems can experience flow instabilities characterized by cyclic pressure ... more Oil and gas gathering systems can experience flow instabilities characterized by cyclic pressure variations and liquid or free water surges out of the flowlines that typically cause liquid or gas handling problems in receiving facilities and dynamic external loads in elbows and T-junctions. This study describes a new mechanism of instability of gas-liquid flow in a well-flowline-receiving facility system referred to in other industrial applications as the density or liquid holdup wave oscillations (DWO). Unlike instability phenomena related to hydrodynamic slugs, terrain-induced slugs or riser-induced severe slugging, this type of instability is a result of multiple feedback effects between the flow rate, pressure drop, and liquid inventory (the total volume) in the flowline. The specific DWO instability mechanism proposed in the present study is related to generation and propagation of a liquid holdup wave with a large amplitude and wavelength several times greater than the length ...
A study of transient oil-water flow in hilly-terrain pipelines is described in the present paper.... more A study of transient oil-water flow in hilly-terrain pipelines is described in the present paper. Numerical simulation of terrain slug propagation during the line startup is performed using a novel computer code, mFLOW, for modeling transient flow of two immiscible liquids in pipelines. It is shown that a startup slug may propagate through the system without deformation of its front and tail or may dissipate. The mechanisms of slug dissipation are discussed. It is shown that the fluid pressure response is governed mainly by the process of water holdup wave propagation. It is demonstrated that the analysis of fluid transients in pipelines conveying oil-water mixtures provides useful information for the evaluation of the risk of over-pressurization during the startup period.
Localized internal corrosion, paraffin/wax deposition, microbiologically induced corrosion or MIC... more Localized internal corrosion, paraffin/wax deposition, microbiologically induced corrosion or MIC, and solids accumulation are some of the primary issues throughout a pipeline's lifecycle, especially, at low flow conditions. Although significant progress has been made in the development of methodologies and standards for detecting internal corrosion in different types of pipelines, little work has been done on providing cost-effective methods and technologies for the implementation of preventive corrosion strategies. Pigging and chemical inhibition continue to be the first choice of oil and gas producers in addressing asset integrity and flow assurance issues. This paper describes an Artificial Intelligence (AI) technology that enables operators of oil and gas gathering facilities to transport produced fluids as a sequence of alternating controllable fluid batches to remove stationary beds of solids or soft wax from flowlines and pipelines, including unpiggable lines, without hu...
International Petroleum Conference and Exhibition of Mexico, 1998
This paper was prepared for presentation at the 1998 SPE International Petroleum Conference and E... more This paper was prepared for presentation at the 1998 SPE International Petroleum Conference and Exhibition held in Villahermosa, Mexico, 3-5 March 1998.
Engineering Technology Conference on Energy, Parts A and B, 2002
A numerical model of transient two-phase in a wellbore after startup of electrical submersible pu... more A numerical model of transient two-phase in a wellbore after startup of electrical submersible pump (ESP) was developed in the present study. The model consists of three modules. The first module, the wellbore model, predicts two-phase gas-liquid flow in the wellbore. The second module describes performance characteristics of centrifugal pumps. The third module, the reservoir model, predicts the variable well inflow after startup of the pump. The wellbore model is based on a drift-flux model (three equation model) of two-phase flow. The relative velocity is determined using a flow regime-dependent slip correlation or a mechanistic steady flow model. Field data collected during a startup of an ESP well were analyzed. This analysis showed that the response of the system to the ESP startup is governed by dynamic interacticn between the well and reservoir. The results obtained can be used for the development of production startup or restart procedures for wells equipped with ESP systems.
Proceedings of SPE Annual Technical Conference and Exhibition, 2006
Numerical simulations of the pump start-up in an ESP were performed A comparison of the model pre... more Numerical simulations of the pump start-up in an ESP were performed A comparison of the model predictions with field data is shown. Results of numerical simulations of the ESP start-up in a well producing heavy (13 °API) crude oil are presented. Liquid level variations in the casing annulus observed during the well start-up are explained. A parametric study was carried out to investigate the effects of reservoir characteristics and oil viscosity on the pressure and flow rate variations, as well as on the system response time. The results obtained can be used for the development of operational strategies for artificial lift systems with ESP.
Proceedings of First International Oil Conference and Exhibition in Mexico, 2006
Continuous flow gas-lift wells are susceptible to hydrodynamic instability (heading), which cause... more Continuous flow gas-lift wells are susceptible to hydrodynamic instability (heading), which causes cyclic variations of the wellhead pressure, oil and injected gas flow rates. Flow instability is an important issue in the design and operation of continuous flow gas-lift installations used in floating production systems. In such systems, the produced fluids from wells are transported through a flexible riser pipe to the Floating Production, Storage and Offloading (FPSO) vessel. In this paper, the influence of the riser design, the well design, and the gas injection system design on the stability of the production facility is studied. Gas-lift stability maps showing the operational and stability boundaries are presented. The application of different well stabilization techniques in offshore gas-lift installations is discussed.
Proceedings of SPE Annual Technical Conference and Exhibition, 2005
... AIME. SPE, Richardson, Texas. 3. Poblano, E., Camacho, R. and Fairuzov, Y. : Stability Analy... more ... AIME. SPE, Richardson, Texas. 3. Poblano, E., Camacho, R. and Fairuzov, Y. : Stability Analysis of Continuous-Flow Gas-Lift Wells, SPE 77732, SPE ATCE held in San Antonio, Texas, 29 September2 October 2002. 4. Fairuzov ...
Fluid transients in the production system caused by startup of electrical submersible pump (ESP) ... more Fluid transients in the production system caused by startup of electrical submersible pump (ESP) were studied in the present paper. A numerical model of an ESP well was developed. The system model consists of three modules. The first module, the well model, predicts transient flow in the tubing and the casing. The second module describes the ESP performance characteristics. The third module is a model of single-phase flow in the reservoir. The modules developed are integrated into the whole production system model using an iterative coupling algorithm. The model predictions are compared with field data. The study revealed that the system response on the ESP startup is controlled by dynamic interaction between the well and the reservoir. Model predictions are found to agree qualitatively with field data.
Summary In this study, a lumped-parameter model of transient two-phase gas/liquid flow in a wellb... more Summary In this study, a lumped-parameter model of transient two-phase gas/liquid flow in a wellbore is presented. The model is based on the assumption that the flow process is essentially one-dimensional so that an area's average properties can be represented as a function of one space variable and time. The wellbore is divided into a number of control volumes (nodes) that are connected by junctions (flow paths). A mass equation is formulated for each control volume, and an approximate momentum equation is used to calculate the flow rate at each junction. A numerical algorithm for coupling the wellbore model with a reservoir model is proposed. Calculations were carried out to determine the behavior of the wellbore flow during a pressure-buildup test. The results obtained from these calculations are compared to previously published theoretical results.
A two-phase cooling system with a jet pump is proposed for the thermal control of spacecraft. The... more A two-phase cooling system with a jet pump is proposed for the thermal control of spacecraft. The system does not require an external source of energy, the pumping of the working fluid is performed by the work that is produced in a thermodynamic cycle being carried out in the heat transport loop. The cooling system has no moving parts or
Transient conjugate two-phase heat transfer during depressurization of pipelines containing flash... more Transient conjugate two-phase heat transfer during depressurization of pipelines containing flashing liquids is examined in this paper. A numerical model for transient flashing liquid flow in a pipe is formulated. The model takes into account the transient radial heat conduction and the forced convection effects. Numerical simulation of flashing two-component (propane and butane) flow is performed in order to investigate the effect of wall friction on the heat transfer conditions in the pipe. The simulation results are compared with predictions of the model that are based on a new formulation of energy equation proposed by the author in an early study. A comparison of the results obtained allows one to determine the range of applicability of the new energy equation formulation. A procedure is proposed for choosing an appropriate model for predicting transient conjugate two-phase heat transfer during releases of flashing liquids from pipes. A criterion of thermodynamic similarity for...
The vertically integrated conservation equations for momentum and mass are solved for a computati... more The vertically integrated conservation equations for momentum and mass are solved for a computational domain that considers the changes in bathymetry due to the longshore sediment transport in the nearshore environment. The model considers the driving forces due to the radiation stress field established by an integrated wave transformation model that includes both refraction and diffraction. For the sediment transport, an energetic approach is implemented that allows various formulations to be tested against field data. The changes in bathymetry are allowed for through local changes in porosity factors that affect both computational cell areas and volume. The solution algorithm used is the SIMPLEST and the iterative method has proved to converge adequately.
A 50 kg. satellite is being developed at the University of Mexico as an engineering test bed. SAT... more A 50 kg. satellite is being developed at the University of Mexico as an engineering test bed. SATEX-l is programmed to be launched to polar orbit early in 1995 by Ariane. The satellite structure comprises aluminum sandwich panels and composites in the form of a cube made with two matting U-shaped parts. This solution was selected for simplicity during assembly and testing. The sIc body is further stiffened by an internal panel which supports a pressurized gas tank and other hardware. All panels are joined by standard comer and edge close-outs and splices. At present, a finite element model for the validation of the design, regarding static and dynamic behaviour is being conducted. The paper presents numerical results for quasi static and dynamic analysis, such as eigen-values, free vibration and sinusoidal vibrations. The testing program follows closely launcher agency requirements and is supported by previous similar experiences in our laboratory. Also,a general description of the project is included.
Oil and gas gathering systems can experience flow instabilities characterized by cyclic pressure ... more Oil and gas gathering systems can experience flow instabilities characterized by cyclic pressure variations and liquid or free water surges out of the flowlines that typically cause liquid or gas handling problems in receiving facilities and dynamic external loads in elbows and T-junctions. This study describes a new mechanism of instability of gas-liquid flow in a well-flowline-receiving facility system referred to in other industrial applications as the density or liquid holdup wave oscillations (DWO). Unlike instability phenomena related to hydrodynamic slugs, terrain-induced slugs or riser-induced severe slugging, this type of instability is a result of multiple feedback effects between the flow rate, pressure drop, and liquid inventory (the total volume) in the flowline. The specific DWO instability mechanism proposed in the present study is related to generation and propagation of a liquid holdup wave with a large amplitude and wavelength several times greater than the length ...
A study of transient oil-water flow in hilly-terrain pipelines is described in the present paper.... more A study of transient oil-water flow in hilly-terrain pipelines is described in the present paper. Numerical simulation of terrain slug propagation during the line startup is performed using a novel computer code, mFLOW, for modeling transient flow of two immiscible liquids in pipelines. It is shown that a startup slug may propagate through the system without deformation of its front and tail or may dissipate. The mechanisms of slug dissipation are discussed. It is shown that the fluid pressure response is governed mainly by the process of water holdup wave propagation. It is demonstrated that the analysis of fluid transients in pipelines conveying oil-water mixtures provides useful information for the evaluation of the risk of over-pressurization during the startup period.
Localized internal corrosion, paraffin/wax deposition, microbiologically induced corrosion or MIC... more Localized internal corrosion, paraffin/wax deposition, microbiologically induced corrosion or MIC, and solids accumulation are some of the primary issues throughout a pipeline's lifecycle, especially, at low flow conditions. Although significant progress has been made in the development of methodologies and standards for detecting internal corrosion in different types of pipelines, little work has been done on providing cost-effective methods and technologies for the implementation of preventive corrosion strategies. Pigging and chemical inhibition continue to be the first choice of oil and gas producers in addressing asset integrity and flow assurance issues. This paper describes an Artificial Intelligence (AI) technology that enables operators of oil and gas gathering facilities to transport produced fluids as a sequence of alternating controllable fluid batches to remove stationary beds of solids or soft wax from flowlines and pipelines, including unpiggable lines, without hu...
International Petroleum Conference and Exhibition of Mexico, 1998
This paper was prepared for presentation at the 1998 SPE International Petroleum Conference and E... more This paper was prepared for presentation at the 1998 SPE International Petroleum Conference and Exhibition held in Villahermosa, Mexico, 3-5 March 1998.
Engineering Technology Conference on Energy, Parts A and B, 2002
A numerical model of transient two-phase in a wellbore after startup of electrical submersible pu... more A numerical model of transient two-phase in a wellbore after startup of electrical submersible pump (ESP) was developed in the present study. The model consists of three modules. The first module, the wellbore model, predicts two-phase gas-liquid flow in the wellbore. The second module describes performance characteristics of centrifugal pumps. The third module, the reservoir model, predicts the variable well inflow after startup of the pump. The wellbore model is based on a drift-flux model (three equation model) of two-phase flow. The relative velocity is determined using a flow regime-dependent slip correlation or a mechanistic steady flow model. Field data collected during a startup of an ESP well were analyzed. This analysis showed that the response of the system to the ESP startup is governed by dynamic interacticn between the well and reservoir. The results obtained can be used for the development of production startup or restart procedures for wells equipped with ESP systems.
Proceedings of SPE Annual Technical Conference and Exhibition, 2006
Numerical simulations of the pump start-up in an ESP were performed A comparison of the model pre... more Numerical simulations of the pump start-up in an ESP were performed A comparison of the model predictions with field data is shown. Results of numerical simulations of the ESP start-up in a well producing heavy (13 °API) crude oil are presented. Liquid level variations in the casing annulus observed during the well start-up are explained. A parametric study was carried out to investigate the effects of reservoir characteristics and oil viscosity on the pressure and flow rate variations, as well as on the system response time. The results obtained can be used for the development of operational strategies for artificial lift systems with ESP.
Proceedings of First International Oil Conference and Exhibition in Mexico, 2006
Continuous flow gas-lift wells are susceptible to hydrodynamic instability (heading), which cause... more Continuous flow gas-lift wells are susceptible to hydrodynamic instability (heading), which causes cyclic variations of the wellhead pressure, oil and injected gas flow rates. Flow instability is an important issue in the design and operation of continuous flow gas-lift installations used in floating production systems. In such systems, the produced fluids from wells are transported through a flexible riser pipe to the Floating Production, Storage and Offloading (FPSO) vessel. In this paper, the influence of the riser design, the well design, and the gas injection system design on the stability of the production facility is studied. Gas-lift stability maps showing the operational and stability boundaries are presented. The application of different well stabilization techniques in offshore gas-lift installations is discussed.
Proceedings of SPE Annual Technical Conference and Exhibition, 2005
... AIME. SPE, Richardson, Texas. 3. Poblano, E., Camacho, R. and Fairuzov, Y. : Stability Analy... more ... AIME. SPE, Richardson, Texas. 3. Poblano, E., Camacho, R. and Fairuzov, Y. : Stability Analysis of Continuous-Flow Gas-Lift Wells, SPE 77732, SPE ATCE held in San Antonio, Texas, 29 September2 October 2002. 4. Fairuzov ...
Fluid transients in the production system caused by startup of electrical submersible pump (ESP) ... more Fluid transients in the production system caused by startup of electrical submersible pump (ESP) were studied in the present paper. A numerical model of an ESP well was developed. The system model consists of three modules. The first module, the well model, predicts transient flow in the tubing and the casing. The second module describes the ESP performance characteristics. The third module is a model of single-phase flow in the reservoir. The modules developed are integrated into the whole production system model using an iterative coupling algorithm. The model predictions are compared with field data. The study revealed that the system response on the ESP startup is controlled by dynamic interaction between the well and the reservoir. Model predictions are found to agree qualitatively with field data.
Summary In this study, a lumped-parameter model of transient two-phase gas/liquid flow in a wellb... more Summary In this study, a lumped-parameter model of transient two-phase gas/liquid flow in a wellbore is presented. The model is based on the assumption that the flow process is essentially one-dimensional so that an area's average properties can be represented as a function of one space variable and time. The wellbore is divided into a number of control volumes (nodes) that are connected by junctions (flow paths). A mass equation is formulated for each control volume, and an approximate momentum equation is used to calculate the flow rate at each junction. A numerical algorithm for coupling the wellbore model with a reservoir model is proposed. Calculations were carried out to determine the behavior of the wellbore flow during a pressure-buildup test. The results obtained from these calculations are compared to previously published theoretical results.
A two-phase cooling system with a jet pump is proposed for the thermal control of spacecraft. The... more A two-phase cooling system with a jet pump is proposed for the thermal control of spacecraft. The system does not require an external source of energy, the pumping of the working fluid is performed by the work that is produced in a thermodynamic cycle being carried out in the heat transport loop. The cooling system has no moving parts or
Transient conjugate two-phase heat transfer during depressurization of pipelines containing flash... more Transient conjugate two-phase heat transfer during depressurization of pipelines containing flashing liquids is examined in this paper. A numerical model for transient flashing liquid flow in a pipe is formulated. The model takes into account the transient radial heat conduction and the forced convection effects. Numerical simulation of flashing two-component (propane and butane) flow is performed in order to investigate the effect of wall friction on the heat transfer conditions in the pipe. The simulation results are compared with predictions of the model that are based on a new formulation of energy equation proposed by the author in an early study. A comparison of the results obtained allows one to determine the range of applicability of the new energy equation formulation. A procedure is proposed for choosing an appropriate model for predicting transient conjugate two-phase heat transfer during releases of flashing liquids from pipes. A criterion of thermodynamic similarity for...
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Papers by Yuri Fairuzov