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well-production
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A novel method for mitigation of asphaltene deposition in the wellstring
, Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 29, Issue 2 , 2010 , Pages 131-142 ; 10219986 (ISSN) ; Rashtchian, D ; Tohidi, B ; Jamialahmadi, M ; Sharif University of Technology
2010
Abstract
Asphaltene precipitation and deposition is a serious problem in many Iranian fields. The deposited asphaltene results in partial or total blockage of the wellbore and wellstring reducing or completely seizing oil production. This paper studies the asphaltene problem and mitigation methods in wellstring systematically. It presents new approach based on the combination of thermodynamic modeling of asphaltene precipitation with hydrodynamic well modeling. The developed model is capable to determine the asphaltene precipitation and deposition interval through the wellstring. Therefore, it could study the effect of hydrodynamic parameters such as wellhead pressure, well flow-rate and tubing size...
Solar generated steam injection in HAMCA, Venezuelan extra heavy oil reservoir; Simulation study for oil recovery performance, economical and environmental feasibilities
, Article EUROPEC 2015, 1 June 2015 through 4 June 2015 ; 2015 , Pages 1176-1202 ; 9781510811621 (ISBN) ; Ayatollahi, S ; Bashtani, F ; Romero, C ; Sharif University of Technology
Society of Petroleum Engineers
2015
Abstract
Application of solar energy compared to conventional gas-burning boilers for steam generation in thermal Enhanced Oil Recovery processes is a newly attended technology, which brings significant benefits to the petroleum industry through environmental and economical aspects. This technique is especially designed for the regions in which gas-burning steam generation is not viable in large scale. The objective of this study is to investigate about viability of using solar energy to generate steam instead of using conventional steam generators in a Venezuelan extra heavy oil reservoir. Limited gas production policy of the Venezuelan government is the major challenge for utilizing gas steam...
A mixed integer-programming model for periodic routing of special vessels in offshore oil industry
, Article International Journal of Industrial Engineering : Theory Applications and Practice ; Volume 22, Issue 5 , 2015 , Pages 524-548 ; 10724761 (ISSN) ; Yazdeli Roohollah, I ; Sharif University of Technology
University of Cincinnati
2015
Abstract
In order to maintain the production of offshore oil wells, the National Iranian Oil Company periodically services facilities and equipment located in oil wellheads with mobile wellhead servants. It also gives technical supports to oil wellheads and mobile wellhead servants with supporter vessels. Due to supply limitations, there are not enough special vessels (namely supporter vessels and mobile wellhead servants) compared to the number of oil wellheads. The failure of special vessels to service oil wellheads and supporter vessels to technically support mobile wellhead servants based on a predetermined plan, will lead to considerable loss in production performance of oil wells and hence...
Study of ESP and Gas Lift Applications On low Productivity Wells of Alvand Oil Field
, M.Sc. Thesis Sharif University of Technology ; Jamshidi, Saeed (Supervisor)
Abstract
Alavand Oil field is located 50 Km away from west of Siri Island and includes DPG and DPH platforms. The production from Alavand field started in 1998 and till now 11 wells have been totally drilled .Since a production peak in 2001, the oil production in Alvand field has decreased. Water cut is increasing and reservoir pressure is decreasing gradually. Considering poor reservoir characteristic of this reservoir, productivity indexes of wells are relatively low. In addition; natural depletion of reservoir caused the wells to be unable to flow naturally and either closed or produce periodically consequently. To increase production and extend the lifetime of Alvand field, it is decided to start...
Investigation on Aplicability of Decline Curve Analysis for Gas Condensate Reservoirs
, M.Sc. Thesis Sharif University of Technology ; Masihi, Mohsen (Supervisor) ; Gerami, Shahab (Supervisor)
Abstract
Part 1: Techniques of production data analysis for single-phase oil and gas reservoirs have advanced significantly over the past few years. These techniques range from traditional (Arps and Fetkovich) to modern (they account for the variation of operating conditions at the wellbore). Although the production data analysis methods are used generally for single phase reservoirs, the application of these techniques for analysis of production data of a gas condensate reservoir may not yield the reliable answer due to the fact that the flow of fluid in gas condensate reservoirs is not single-phase. This study presents the treatment of the modern methods of production data analysis (single phase...
Technical and Economic Feasibility Study of Utilizing Managed Pressure Drilling (MPD) Technology in Drilling HP/HT Oil and Gas Wells of Iran
, M.Sc. Thesis Sharif University of Technology ; Eshraghniaye Jahromi, Abdolhamid (Supervisor)
Abstract
Acceptance of new technologies in an industrial field generally takes a long time, and needs accelerators and facilitators to be thoroughly and truly understood, accepted, and then implemented. One of the most useful accelerators is Feasibility Study, which help the specialists to be confident that the whole technical and economic aspects of the issue are considered in an overall view and the technology is totally feasible and beneficial.Managed Pressure Drilling which was introduced as a new technology to drilling industry internationally in 2003 and developed rapidly till now, is one of the most useful technologies in the oil and gas wells drilling industry, and helps the Operator...
Investigating the effect of heterogeneity on infill wells
, Article Journal of Petroleum Exploration and Production Technology ; Volume 6, Issue 3 , 2016 , Pages 451-463 ; 21900558 (ISSN) ; Masihi, M ; Sharif University of Technology
Springer Verlag
2016
Abstract
In recent years, improving oil recovery (IOR) has become an important subject for the petroleum industry. One IOR method is infill drilling, which improves hydrocarbon recovery from virgin zones of the reservoir. Determining the appropriate location for the infill wells is very challenging and greatly depends on different factors such as the reservoir heterogeneity. This study aims to investigate the effect of reservoir heterogeneity on the location of infill well. In order to characterize the effect of heterogeneity on infill well locations, some geostatistical methods, e.g., sequential gaussian simulation, have been applied to generate various heterogeneity models. In particular, different...
Challenges in calculation of critical buckling load of tubular members of jacket platforms in finite element modeling
, Article Journal of Marine Science and Technology (Japan) ; 2019 ; 09484280 (ISSN) ; Erfani, M. H ; Sayyaadi, H ; Sharif University of Technology
Springer Tokyo
2019
Abstract
Accurate estimation of the capacity curve of offshore jacket structures to achieve performance levels and ductility is of great importance. Proper modeling of compressive members to correctly investigate global and local buckling is crucial in estimation of the capacity curve. Buckling modes and deformations due to local buckling can be considered, if the compressive braces are modeled by shell or solid elements. The purpose of this paper is to achieve the correct compressive behavior of braces with solid type elements and investigate the effects of five different parameters such as D/t, L/D, mesh size, mesh size ratio, and imperfections. ABAQUS FE software is used for this purpose. The...
Challenges in calculation of critical buckling load of tubular members of jacket platforms in finite element modeling
, Article Journal of Marine Science and Technology (Japan) ; 2019 ; 09484280 (ISSN) ; Erfani, M. H ; Sayyaadi, H ; Sharif University of Technology
Springer Tokyo
2019
Abstract
Accurate estimation of the capacity curve of offshore jacket structures to achieve performance levels and ductility is of great importance. Proper modeling of compressive members to correctly investigate global and local buckling is crucial in estimation of the capacity curve. Buckling modes and deformations due to local buckling can be considered, if the compressive braces are modeled by shell or solid elements. The purpose of this paper is to achieve the correct compressive behavior of braces with solid type elements and investigate the effects of five different parameters such as D/t, L/D, mesh size, mesh size ratio, and imperfections. ABAQUS FE software is used for this purpose. The...
Optimum arrangement of braces in jacket platform based on strength and ductility
, Article Marine Structures ; Volume 71 , 2020 ; Fatemi, M ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Nonlinear behavior of jacket platforms is important in both design and rehabilitation issues that depends on the bracing arrangement. Both ductility and strength of the structures derived from pushover analysis are highly related to configuration of the braces. Considering a suitable criterion such as constant weight or constant stiffness and period of the structure in all arrangement cases, one can compare the capacity curves and find the best configuration. In this paper a simple logical method for investigating the strength and ductility of the jacket structure is presented, it is shown that global geometry and configuration of the braces are very important and effective in both strength...
Investigation of the effect of the added mass fluctuation and lateral vibration absorbers on the vertical nonlinear vibrations of the offshore wind turbine
, Article Nonlinear Dynamics ; Volume 103, Issue 2 , 2021 , Pages 1499-1515 ; 0924090X (ISSN) ; Moradi, H ; Vossoughi, G ; Sharif University of Technology
Springer Science and Business Media B.V
2021
Abstract
In this article, the effects of the changes in the mass of the floating wind turbine (as a multi-body system) on its nonlinear vertical vibrations are investigated. The fluctuations of the hydrodynamic added mass of the floating platform and the mass of the vibration absorbers, which added to the structure to mitigate the lateral vibrations, change the mass and consequently the dynamics of the vertical vibrations. In this regard, first, the governing equations of the vertical vibrations of the floating wind turbine are derived. The FAST code is used to validate the proposed model of the dynamics of the vertical vibrations through numerical simulations. Then, derived equations are solved...
Aerodynamic enhancement and improving the performance of a six-megawatt dowec wind turbine by micro-plasma actuator
, Article International Journal of Mechanical Sciences ; Volume 195 , 2021 ; 00207403 (ISSN) ; Mazaheri, K ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
We have investigated the usage of a Dielectric Barrier Discharge (DBD) plasma actuator to improve the aerodynamic performance of an offshore 6 MW wind turbine. By controlling the aerodynamic load combined with pitch angles of 2, 5, and 10 degrees, we studied the plasma actuator effect on the overall harvested power. Actuators were installed in single and tandem configurations in different chord-wise locations to find the optimum design. The improved phenomenological model developed by authors was used in an analysis to simulate the interaction of the electrostatic field, the ionized particles and the fluid flow. A design software was used to estimate the harvested power of the real 3D blade....
Conceptual study on dynamic response of semi-submersible
, Article Proceedings of the Institution of Civil Engineers: Maritime Engineering ; 2021 ; 17417597 (ISSN) ; Hajnoruzi, F ; Sharif University of Technology
ICE Publishing
2021
Abstract
Hydrodynamic analysis of semi-submersible offshore structures has been the topic of many researches performed numerically and experimentally in the past. In this paper, the effect of structure alignment and mooring lines on dynamic behaviour of semi-submersible platforms has been taken into account. The contribution of pitch and roll in heave motion of side points is also investigated. Mooring lines are connected to semi-submersible at sides and therefore total displacement of side points is related to total displacement of mooring lines and total tension as well. A three dimensional boundary element model of Amirkabir platform in Caspian Sea is implemented using boundary element method...
Vortex shedding modes around oscillating non-uniform double heave plates
, Article Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment ; Volume 235, Issue 2 , 2021 , Pages 558-569 ; 14750902 (ISSN) ; Alvandi, M ; Behzad, M ; Thiagarajan, K. P ; Sharif University of Technology
SAGE Publications Ltd
2021
Abstract
Multiple co-axial heave plates of uniform geometry are attached to offshore platforms for inducing damping and added mass. These effects generally decrease the magnitude of the dynamic response of the platform under applied environmental excitation forces. When spacing between heave plates is decreased the damping and added mass performance are altered due to their strong vortex interaction. A new non-uniform plate configuration is proposed that may create different hydrodynamic characteristics. The modes of vortex shedding around plate edges in a non-uniform arrangement under forced harmonic oscillation are investigated via the CFD method. Furthermore, a new simplified formula for the total...
Hydrodynamic damping enhancement by implementing a novel combined rigid-elastic heave plate
, Article Journal of Marine Science and Technology (Japan) ; Volume 26, Issue 1 , 2021 , Pages 216-232 ; 09484280 (ISSN) ; Behzad, M ; Thiagarajan, K ; Sharif University of Technology
Springer Japan
2021
Abstract
Heave plates are structural components used for reducing the vibrations caused by environmental forces on marine and offshore structures by changing the hydrodynamic properties. The fact that the added mass increase via heave plates does not always lead to the structural response reduction underscores the role of damping in maintaining the vibration amplitude within allowable limits. In the present experimental study, a novel combined rigid-elastic design is used to improve the damping through the velocity increase in the elastic part and added mass creation in the central rigid part. The desired percentage of total added mass and damping can be adjusted by changing the rigid-to-elastic...
Vortex shedding modes around oscillating non-uniform double heave plates
, Article Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment ; Volume 235, Issue 2 , 2021 , Pages 558-569 ; 14750902 (ISSN) ; Alvandi, M ; Behzad, M ; Thiagarajan, K. P ; Sharif University of Technology
SAGE Publications Ltd
2021
Abstract
Multiple co-axial heave plates of uniform geometry are attached to offshore platforms for inducing damping and added mass. These effects generally decrease the magnitude of the dynamic response of the platform under applied environmental excitation forces. When spacing between heave plates is decreased the damping and added mass performance are altered due to their strong vortex interaction. A new non-uniform plate configuration is proposed that may create different hydrodynamic characteristics. The modes of vortex shedding around plate edges in a non-uniform arrangement under forced harmonic oscillation are investigated via the CFD method. Furthermore, a new simplified formula for the total...
Hydrodynamic damping enhancement by implementing a novel combined rigid-elastic heave plate
, Article Journal of Marine Science and Technology (Japan) ; Volume 26, Issue 1 , 2021 , Pages 216-232 ; 09484280 (ISSN) ; Behzad, M ; Thiagarajan, K ; Sharif University of Technology
Springer Japan
2021
Abstract
Heave plates are structural components used for reducing the vibrations caused by environmental forces on marine and offshore structures by changing the hydrodynamic properties. The fact that the added mass increase via heave plates does not always lead to the structural response reduction underscores the role of damping in maintaining the vibration amplitude within allowable limits. In the present experimental study, a novel combined rigid-elastic design is used to improve the damping through the velocity increase in the elastic part and added mass creation in the central rigid part. The desired percentage of total added mass and damping can be adjusted by changing the rigid-to-elastic...
A Review on chemical sand production control techniques in oil reservoirs
, Article Energy and Fuels ; 2022 ; 08870624 (ISSN) ; Baghban Salehi, M ; Hosseinzadehsemnani, R ; Moghanloo, R. G ; Taghikhani, V ; Sharif University of Technology
American Chemical Society
2022
Abstract
This review aims to bring together the studies on petroleum reservoirs' sand production control in a comprehensive guide for the researcher to compare various methods for the chemical consolidation of sand. Sand production can be considered one of the major challenges in the petroleum production industry, causing severe operational issues. This study introduces various methods to control and prevent sand production in petroleum wells and evaluates their advantages and performance in tabular form. The use of chemical procedures is considered to be more efficient in counteracting the production and migration of sand. Various chemicals and polymers have been proposed for this purpose. These...
New technique for calculation of well deliverability in gas condensate reservoir
, Article Deep Gas Conference and Exhibition 2010, DGAS 2010 ; January , 2010 , p. 51-59 ; SPE Deep Gas Conference and Exhibition, 24-26 January, Manama, Bahrain Publication Date 2010 ; Sadeghi, A ; Masihi, M ; Sharif University of Technology
Abstract
Well deliverability is an important issue in forecasting the performance of many gas condensate reservoirs. Condensate accumulation near the wellbore can cause a significant reduction in productivity, even in reservoirs where the fluid is very lean. Generally, the well deliverability is affected by two pressure-drop sources due to depletion and condensate buildup. Recently Rapid spreadsheet tools have developed to evaluate the well performance using material balance equation for depletion and two-phase pseudo pressure integral for well inflow performance. Most of them account for the effects of negative inertia and positive coupling in the calculation of gas relative permeability. This paper...
New technique for calculation of well deliverability in gas condensate reservoirs
, Article Journal of Natural Gas Science and Engineering ; Vol. 2, issue. 1 , March , 2010 , p. 29-35 ; ISSN: 18755100 ; Masihi, M ; Sharif University of Technology
Abstract
Well deliverability is an important issue in forecasting the performance of many gas condensate reservoirs. Condensate accumulations near the wellbore may cause a significant reduction in the well productivity, even in the case of very lean fluids. Generally, the well deliverability is affected by two pressure-drop sources due to depletion and condensate buildup. Recently rapid spreadsheet tools have been developed to evaluate the well performance using material balance equation for depletion and two-phase pseudo pressure integral for well inflow performance. Most of them account for the effects of negative inertia and positive coupling in the calculation of gas relative permeabilities. This...