Cenk Temizel | University of Southern California (original) (raw)

Papers by Cenk Temizel

Research paper thumbnail of Aspects of Reservoir Characterization from Waterflood Performance Data

SPE/PS-CIM/CHOA International Thermal …, 2005

Analytical techniques for prediction of waterfloods using homogeneous models are non-representati... more Analytical techniques for prediction of waterfloods using homogeneous models are non-representative of behaviors observed for actual reservoirs. We have noted, however, that a scrutiny of such deviations can lead to estimation techniques for characterization of ...

Research paper thumbnail of Optimization of CO2 Sequestration in Reservoirs under Geochemistry and Thermal Effects

Disposal and long-term sequestration of anthropogenic "greenhouse gases" such as CO2 is a propose... more Disposal and long-term sequestration of anthropogenic "greenhouse gases" such as CO2 is a proposed approach to reducing global warming. Deep, regional-scale aquifers in sedimentary basins are possible sites for sequestration, given their ubiquitous nature. In order for CO2 to be stored in aquifers responsibly, it is essential to identify key concepts that need to be considered for potential implementation. Ideally, injected CO2 will migrate through an aquifer from injection wells to remote storage sites, and remain isolated from the atmosphere for a considerable period of time. Fundamental topics of interest in sequestration research have concerned not just scientific and technical aspects, but practical concerns such as the economic feasibility of storage, safety, and the maximum possible amount of CO2 storage globally and for specified regions. Thus, it is crucial to have a robust understanding of this important process not only in theory but in practice too through illustration with solid examples as in this study. A robust commercial optimization and uncertainty software is coupled with a full-physics commercial simulator that models the phenomenon in order to investigate the significance of the major parameters on performance of wells in CO2 sequestration under geochemistry and thermal effects. CO2 injection is done for first 25 years. The injector is shut-in thereafter and the fate of CO2 is modeled for the next 225 years. Chemical equilibrium constants are functions of temperature. Trace gas is used. Molecular diffusion of CO2 in water is modeled. Thermal effects due to injection of CO2 at are modeled. Sensitivity and optimization have been done on major reservoir parameters such as fluid and rock properties and well operational parameters and then significance of each has been illustrated in tornado diagrams. It is observed that a robust approach on handling of uncertainties in reservoir are as important as management of well operational parameters in the scope of reservoir management. Presence of impact of geochemistry and temperature effects have proven to play an important role in the process.

Research paper thumbnail of Methods and Systems Related to Hydrocarbon Recovery Strategy Development

Research paper thumbnail of Method and System of Selecting Hydrocarbon Wells for Workover

Research paper thumbnail of Production Optimization in Heavy Oil Recovery Processes

SPE Heavy Oil Conference and Exhibition, 2016

Research paper thumbnail of Surface Web Balance Method: A Neural Network-Based Approach to Mitigate Subsidence in Diatomites Coupling Surface Deformation and Injection/Production Data

SPE Annual Technical Conference and Exhibition, 2016

Research paper thumbnail of Production Optimization Through Voidage Replacement Using Triggers for Production Rate

SPE Heavy Oil Conference and Exhibition, 2016

Research paper thumbnail of Improved Optimization Through Procedures as Pseudo Objective Functions in Nonlinear Optimization of Oil Recovery With Next-Generation Reservoir Simulators

SPE Annual Technical Conference and Exhibition, 2016

Research paper thumbnail of Optimization of Steamflooding Heavy Oil Reservoirs Under Uncertainty

SPE Asia Pacific Oil & Gas Conference and Exhibition, 2016

Research paper thumbnail of An Investigation of Gas Recycling in Fractured Gas-Condensate Reservoirs

Abu Dhabi International Petroleum Exhibition & Conference, 2016

Research paper thumbnail of Turning Data into Knowledge: Data-Driven Surveillance and Optimization in Mature Fields

SPE Annual Technical Conference and Exhibition, 2016

Research paper thumbnail of An Analysis of Multiplicative Schwarz Procedure in Coupling of Reservoir and Networks in Next-Generation Reservoir Simulators

International Petroleum Technology Conference, 2016

Research paper thumbnail of Optimization of Hydraulic Fractures in Tight-Oil Reservoirs Using Different Numerical Fracture Models

SPE Asia Pacific Hydraulic Fracturing Conference, 2016

Research paper thumbnail of An Approach to Mitigate Subsidence in Soft Rocks through Coupling Surface Tiltmeter and Injection/Production Data

SPE Heavy Oil Conference and Exhibition, 2016

Research paper thumbnail of Production Optimization under Injection of Biopolymer, Synthetic Polymer and Gels in a Heterogeneous Reservoir

SPE Eastern Regional Meeting, 2016

Research paper thumbnail of Optimization of Production in Slanted Horizontal Wells in Tight Reservoirs

SPE Reservoir Characterisation and Simulation Conference and Exhibition, 2015

Research paper thumbnail of Optimization of Well Placement in Real-Time Production Optimization of Intelligent Fields with Use of Local and Global Methods

SPE Annual Technical Conference and Exhibition, 2014

Research paper thumbnail of An Analysis of the Effect of Surfactant Flood on Residual Oil under Composition-Dependent Multi-Contact Water-Oil Miscibility in a North Sea Reservoir

Offshore Technology Conference, 2015

Research paper thumbnail of Understanding the Key Parameters in Optimization of Steamfloods in Heavy Oil Fields with Application on SPE Comparative Solution Project

SPE Kuwait Oil and Gas Show and Conference, 2013

ABSTRACT Heavy oil has gained significant attention and importance recently because of a multitud... more ABSTRACT Heavy oil has gained significant attention and importance recently because of a multitude of reasons—growing demand of oil from developing economies, declining availability of easily recoverable or "conventional?? oil, and significant advances in required technology. Even though the current estimates of heavy oil in place are three times that of conventional oil, they have only recently become economically viable because of sustained high oil prices. Improved technology has also driven down the recovery risk to minimal levels. The earliest recovery methods for heavy oil were largely cyclic stimulation, with steamflooding gaining acceptance in the 1970s. Despite other thermal and non-thermal recovery methods for heavy oil, steamflooding remains the most widely used technology. Current production by steamfloods alone totals more than 1.1 million BOPD. Previous studies have established how steamfloods are affected by parameters, such as rock properties, oil composition, degree of steam override, sweep efficiency, steam quality, and steam injection rate. However, the capital-intensive nature and low profit margins of the steamfloods mean that each field development decision is crucial and the oil recovery and margins are much more susceptible to uncertainties in oil price, well performance, facility costs, and subsurface parameters. While studies have been performed to corroborate the effect of subsurface parameters and economic uncertainties separately, there has been little advancement in terms of coupling all of them together in one unified study. In this paper, the effects of uncertainties on project net present value (NPV) are studied by coupling numerical reservoir simulation; a design-of-experiments based approach to handle uncertainty, an established economic model, and a commercial optimizing tool to determine the optimal field operating variables. Introduction Heavy oil has been defined as any liquid petroleum with an API gravity less than 20°. Physical properties that differ between heavy crude oils and lighter grades include higher viscosity and specific gravity, as well as heavier molecular composition. In 2010, the World Energy Council (WEC) defined extra-heavy oil as crude oil that has a gravity of less than 10° API (i.e., with a density greater than 1000 kg/m3 or, equivalently, a specific gravity greater than 1 and a reservoir viscosity of no more than 10,000 cp) (Farouq Ali et al. 1974) With a specific gravity of greater than 1, extra-heavy crude is present as a dense non-aqueous phase liquid in ambient conditions. Heavy crude oil is closely related to natural bitumen from oil sands. Petroleum geologists categorize bitumen from oil sands as "extra-heavy oil?? because of its density of less than 10°API. According to the U.S. Geological Survey, bitumen is further distinguished as extra-heavy oil with a higher viscosity (i.e., resistance to flow): "Natural bitumen, also called tar sands or oil sands, shares the attributes of heavy oil but is yet more dense and viscous. Natural bitumen is oil having a viscosity greater than 10,000 cp Conventional heavy oil and bitumens differ in the degree by which they have been degraded from the original crude oil by bacteria and erosion?? (Farouq Ali et al. 1974) Often, bitumen is present as a solid and does not flow at ambient conditions.

Research paper thumbnail of Investigation of Significance of Critical Components in Optimization of WAG Injection Processes under Uncertainty

SPE Energy Resources Conference, 2014

Research paper thumbnail of Aspects of Reservoir Characterization from Waterflood Performance Data

SPE/PS-CIM/CHOA International Thermal …, 2005

Analytical techniques for prediction of waterfloods using homogeneous models are non-representati... more Analytical techniques for prediction of waterfloods using homogeneous models are non-representative of behaviors observed for actual reservoirs. We have noted, however, that a scrutiny of such deviations can lead to estimation techniques for characterization of ...

Research paper thumbnail of Optimization of CO2 Sequestration in Reservoirs under Geochemistry and Thermal Effects

Disposal and long-term sequestration of anthropogenic "greenhouse gases" such as CO2 is a propose... more Disposal and long-term sequestration of anthropogenic "greenhouse gases" such as CO2 is a proposed approach to reducing global warming. Deep, regional-scale aquifers in sedimentary basins are possible sites for sequestration, given their ubiquitous nature. In order for CO2 to be stored in aquifers responsibly, it is essential to identify key concepts that need to be considered for potential implementation. Ideally, injected CO2 will migrate through an aquifer from injection wells to remote storage sites, and remain isolated from the atmosphere for a considerable period of time. Fundamental topics of interest in sequestration research have concerned not just scientific and technical aspects, but practical concerns such as the economic feasibility of storage, safety, and the maximum possible amount of CO2 storage globally and for specified regions. Thus, it is crucial to have a robust understanding of this important process not only in theory but in practice too through illustration with solid examples as in this study. A robust commercial optimization and uncertainty software is coupled with a full-physics commercial simulator that models the phenomenon in order to investigate the significance of the major parameters on performance of wells in CO2 sequestration under geochemistry and thermal effects. CO2 injection is done for first 25 years. The injector is shut-in thereafter and the fate of CO2 is modeled for the next 225 years. Chemical equilibrium constants are functions of temperature. Trace gas is used. Molecular diffusion of CO2 in water is modeled. Thermal effects due to injection of CO2 at are modeled. Sensitivity and optimization have been done on major reservoir parameters such as fluid and rock properties and well operational parameters and then significance of each has been illustrated in tornado diagrams. It is observed that a robust approach on handling of uncertainties in reservoir are as important as management of well operational parameters in the scope of reservoir management. Presence of impact of geochemistry and temperature effects have proven to play an important role in the process.

Research paper thumbnail of Methods and Systems Related to Hydrocarbon Recovery Strategy Development

Research paper thumbnail of Method and System of Selecting Hydrocarbon Wells for Workover

Research paper thumbnail of Production Optimization in Heavy Oil Recovery Processes

SPE Heavy Oil Conference and Exhibition, 2016

Research paper thumbnail of Surface Web Balance Method: A Neural Network-Based Approach to Mitigate Subsidence in Diatomites Coupling Surface Deformation and Injection/Production Data

SPE Annual Technical Conference and Exhibition, 2016

Research paper thumbnail of Production Optimization Through Voidage Replacement Using Triggers for Production Rate

SPE Heavy Oil Conference and Exhibition, 2016

Research paper thumbnail of Improved Optimization Through Procedures as Pseudo Objective Functions in Nonlinear Optimization of Oil Recovery With Next-Generation Reservoir Simulators

SPE Annual Technical Conference and Exhibition, 2016

Research paper thumbnail of Optimization of Steamflooding Heavy Oil Reservoirs Under Uncertainty

SPE Asia Pacific Oil & Gas Conference and Exhibition, 2016

Research paper thumbnail of An Investigation of Gas Recycling in Fractured Gas-Condensate Reservoirs

Abu Dhabi International Petroleum Exhibition & Conference, 2016

Research paper thumbnail of Turning Data into Knowledge: Data-Driven Surveillance and Optimization in Mature Fields

SPE Annual Technical Conference and Exhibition, 2016

Research paper thumbnail of An Analysis of Multiplicative Schwarz Procedure in Coupling of Reservoir and Networks in Next-Generation Reservoir Simulators

International Petroleum Technology Conference, 2016

Research paper thumbnail of Optimization of Hydraulic Fractures in Tight-Oil Reservoirs Using Different Numerical Fracture Models

SPE Asia Pacific Hydraulic Fracturing Conference, 2016

Research paper thumbnail of An Approach to Mitigate Subsidence in Soft Rocks through Coupling Surface Tiltmeter and Injection/Production Data

SPE Heavy Oil Conference and Exhibition, 2016

Research paper thumbnail of Production Optimization under Injection of Biopolymer, Synthetic Polymer and Gels in a Heterogeneous Reservoir

SPE Eastern Regional Meeting, 2016

Research paper thumbnail of Optimization of Production in Slanted Horizontal Wells in Tight Reservoirs

SPE Reservoir Characterisation and Simulation Conference and Exhibition, 2015

Research paper thumbnail of Optimization of Well Placement in Real-Time Production Optimization of Intelligent Fields with Use of Local and Global Methods

SPE Annual Technical Conference and Exhibition, 2014

Research paper thumbnail of An Analysis of the Effect of Surfactant Flood on Residual Oil under Composition-Dependent Multi-Contact Water-Oil Miscibility in a North Sea Reservoir

Offshore Technology Conference, 2015

Research paper thumbnail of Understanding the Key Parameters in Optimization of Steamfloods in Heavy Oil Fields with Application on SPE Comparative Solution Project

SPE Kuwait Oil and Gas Show and Conference, 2013

ABSTRACT Heavy oil has gained significant attention and importance recently because of a multitud... more ABSTRACT Heavy oil has gained significant attention and importance recently because of a multitude of reasons—growing demand of oil from developing economies, declining availability of easily recoverable or "conventional?? oil, and significant advances in required technology. Even though the current estimates of heavy oil in place are three times that of conventional oil, they have only recently become economically viable because of sustained high oil prices. Improved technology has also driven down the recovery risk to minimal levels. The earliest recovery methods for heavy oil were largely cyclic stimulation, with steamflooding gaining acceptance in the 1970s. Despite other thermal and non-thermal recovery methods for heavy oil, steamflooding remains the most widely used technology. Current production by steamfloods alone totals more than 1.1 million BOPD. Previous studies have established how steamfloods are affected by parameters, such as rock properties, oil composition, degree of steam override, sweep efficiency, steam quality, and steam injection rate. However, the capital-intensive nature and low profit margins of the steamfloods mean that each field development decision is crucial and the oil recovery and margins are much more susceptible to uncertainties in oil price, well performance, facility costs, and subsurface parameters. While studies have been performed to corroborate the effect of subsurface parameters and economic uncertainties separately, there has been little advancement in terms of coupling all of them together in one unified study. In this paper, the effects of uncertainties on project net present value (NPV) are studied by coupling numerical reservoir simulation; a design-of-experiments based approach to handle uncertainty, an established economic model, and a commercial optimizing tool to determine the optimal field operating variables. Introduction Heavy oil has been defined as any liquid petroleum with an API gravity less than 20°. Physical properties that differ between heavy crude oils and lighter grades include higher viscosity and specific gravity, as well as heavier molecular composition. In 2010, the World Energy Council (WEC) defined extra-heavy oil as crude oil that has a gravity of less than 10° API (i.e., with a density greater than 1000 kg/m3 or, equivalently, a specific gravity greater than 1 and a reservoir viscosity of no more than 10,000 cp) (Farouq Ali et al. 1974) With a specific gravity of greater than 1, extra-heavy crude is present as a dense non-aqueous phase liquid in ambient conditions. Heavy crude oil is closely related to natural bitumen from oil sands. Petroleum geologists categorize bitumen from oil sands as "extra-heavy oil?? because of its density of less than 10°API. According to the U.S. Geological Survey, bitumen is further distinguished as extra-heavy oil with a higher viscosity (i.e., resistance to flow): "Natural bitumen, also called tar sands or oil sands, shares the attributes of heavy oil but is yet more dense and viscous. Natural bitumen is oil having a viscosity greater than 10,000 cp Conventional heavy oil and bitumens differ in the degree by which they have been degraded from the original crude oil by bacteria and erosion?? (Farouq Ali et al. 1974) Often, bitumen is present as a solid and does not flow at ambient conditions.

Research paper thumbnail of Investigation of Significance of Critical Components in Optimization of WAG Injection Processes under Uncertainty

SPE Energy Resources Conference, 2014