Loading...
Search for:
oil-wells
0.011 seconds
Total 321 records
Finite Element Analysis of Contact Pressure for Dual Completion Packer Seal Element
, M.Sc. Thesis Sharif University of Technology ; Arghavani Hadi, Jamal (Supervisor)
Abstract
The current research was conducted to investigate the sealing behavior of single-string and dual-string completion Packer. In order to transfer the oil from reservoir located underground to the surface, the string of tubings is used which is called oil well completion string. A typical completion string not only consists of tubings but also the other facilities such as safety valve, traveling joint, sliding side door and Packer as well. Some reasons including: the cost of drilling and challenges in setting wellhead equipment at some geographical situations, producing more oil and gas lead to extraction oil form more than one zone in the oil well. In addition, taking into the account that,...
Acidizing Operation Design for Oil Fields by Use of Neural Network Method
, M.Sc. Thesis Sharif University of Technology ; Goodarznia, Iraj (Supervisor)
Abstract
The acidizing operations have significant impact on productivity and production of oil and gas wells, so that wells having shell or regional damage are good candidates for well stimulation operations which could result in significant increase for efficiency or injectivity. Generally, the neural networks are nonlinear learning mathematical systems. In this project consists, At first, wellhead data of acidizing operation are collected in two Gachsaran oil field (38 wells) and Nar and Kangan gas field (35 wells). Generally, the neural networks are nonlinear learning mathematical systems. In the neural Network by using two algorithms, back propagation algorithm and Quick Propagation algorithm...
Design, Analysis and Prototyping of Cylindrical Electropump with Radial Space Limit
, M.Sc. Thesis Sharif University of Technology ; Arghavani Hadi, Jamal (Supervisor)
Abstract
Inflatable packers are a class of downhole equipments that are used for oilwell pluging operations. To set the packer inside the well, it is necessary to apply hydraulic pressure to it. By using the setting tool and installing an electropump in it, it is possible to transfer the fluid into the packer and supply the required pressure. In this research, an electropump has been designed and built that, firstly, is dimensionally suitable for the conditions of oil wells and, secondly, can have a good performance in the environmental conditions inside the well. This electropump, which can be used in a 2.125-inch setting tool, consists of a brushless direct current motor and a piston pump. To test...
Study of Methods and Design of the Electronic Section for Detection of Fraction of Different phases (Water, Oil and Gas) in Deviated Wells and Flow Measurement for each phase
, M.Sc. Thesis Sharif University of Technology ; Movahedian Attar, Hamid (Supervisor)
Abstract
Most of the time there are three different materials in oil wells; Oil, water and gas. Measuring volume percentage and flow of the individual materials (phases) is an important issue, due to their critical role in extraction process control. Measuring tool should be able to measure flow and percentage of each phase in a case that they are separated (in deviated wells due to gravity). In addition, the measurement should be carried on in a high temperature and high pressure environment and in presence of corrosive substances. Most of previous researches on Multi-Phase Flow Meter (or MPFM) led to mechanical methods to measure flow and they usually use electrical impedance or permittivity for...
Reuse of Abandoned Oil Wells Using a Geothermal-Based Hybrid ORC Unit/Thermoelectric Generator: Energy,Exergy, Thermo-economic Analyses and Multi-criteria Optimisation
, M.Sc. Thesis Sharif University of Technology ; Moosavi, Ali (Supervisor) ; Sadr Hosseini, Hani (Co-Supervisor)
Abstract
In this thesis, three novel geothermal-based ORC systems are proposed to enhance efficiency and to recover the waste heat recovery. The proposed systems are modeled based on basic ORC system (concept 1), ORC system with internal heat exchanger (concept 2), and regenerative ORC system (concept 3). Accordingly, two thermoelectric generators are introduced into the systems to exploit the waste heat of the system. For this purpose, the condenser is replaced by a TEG unit, while the other TEG unit is employed to recover the waste heat of the reinjected geothermal fluid. A comprehensive numerical investigation is conducted to compare the proposed systems from thermodynamic and thermo-economic...
Numerical Study of Sand Production in Oil Extracting Wells
, M.Sc. Thesis Sharif University of Technology ; Pak, Ali (Supervisor)
Abstract
Sand production in petroleum industry is a phenomenon of solid particles being produced together with reservoir fluid. This phenomenon is costing industry billions of dollars every year. Corrosion of the pipelines and other instruments, sand-oil separation cost, possible wellbore choke and repeated shut-in and clean-up of the wellbore are some of examples of the costs. On the other hand, a controlled sanding or even sand production invocation has proved to be very effective in increasing production rate, especially in heavy oil recovery, asphalt wells and low PI wells. Discovering the best sand controlling procedure in oil extracting wells, parameters that have the most important effects on...
Design of a Barge Equipped with Turbojet for oil well Fire Extinguishing
, M.Sc. Thesis Sharif University of Technology ; Abbaspour Tehrani fard, Majid (Supervisor) ; Mehdigholi, Hamid (Supervisor)
Abstract
In this thesis, the use of jet-engine for oil well fire fighting which is a latest in kind is described and analyzed. For this purpose, more familiarization with this system and some knowledge’s such as hydrodynamics characteristic of nominated area, traditional ways of fire fighting in region, different types of jet engines available type of offshore vessels, type of flame and their characteristic are required, which after studying and analyzing above fields in details, the use of turbojet motors and barge has been chosen for the case to obtain optimum specification os this turbojet motors and required dimensions of barge Some information about oil well shuch as, fluid output, speed rate...
Numerical Investigation of Geometrical and Material Parameters Effect on Inflation and Deflation of oil well Inflatable Packers
, M.Sc. Thesis Sharif University of Technology ; Arghavani Hadi, Jamal (Supervisor)
Abstract
Inflatable packers have a great value in downhole operations due to their unique ability to expand to several times their initial diameter. These type of packers have a sealing element. This element is constructed of thin overlapped sheet metal ribs which are surrounding an inner tube. These overlapped ribs protect inner tube against the extrusion. The outer surface of this element covered by a layer of rubber. The outer elastomeric cover seals the annulus of the casing and isolates the zones in the well. In this study, some of the geometrical and material parameters effects on inflation and deflation of inflatable packers are investigated by numerical method. At first, for this purpose, the...
Minimizing the levelized cost of energy in an offshore wind farm with non-homogeneous turbines through layout optimization
, Article Ocean Engineering ; Volume 249 , 2022 ; 00298018 (ISSN) ; Khorasanchi, M ; Sayyaadi, H ; Sadollah, A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Minimum cost of energy is the main goal of a wind farm layout optimization. This is achieved by maximizing the total energy while minimizing the total costs of the farm. In this study, two sizes of commercial turbines were considered to investigate the effect of a non-homogenous farm on the layout optimization process. A cost model consisting of turbines, cable, transformers, foundation, and service vehicle routes was developed. Using Genetic Algorithm and Artificial Neural Network, first the superiority of the new algorithm in turbines and cable layout was verified versus previous studies. Next, two cases were investigated, i.e. (1) a farm populated with identical turbines and (2) a farm...
Experimental study of sand production and permeability enhancement of unconsolidated rocks under different stress conditions
, Article Journal of Petroleum Science and Engineering ; Volume 181 , 2019 ; 09204105 (ISSN) ; Shad, S ; Foroozesh, J ; Salmanpour, S ; Sharif University of Technology
Elsevier B.V
2019
Abstract
Production of sand is a common issue in oil and gas fields causing various production problems. However, as a result of sand production, rock permeability can also be increased at near-wellbore areas, which is considered to be an advantage of solid particles production. Therefore, this study aims to investigate sand production behavior and permeability changes during sand production experimentally. To do so, a specific core flooding system capable of applying different radial and axial stresses has been designed which is equipped with a special fluid distributer at the outlet to prevent any sand particle blockage during fluid production. As part of this study, eleven unconsolidated synthetic...
Efficient back analysis of multiphysics processes of gas hydrate production through artificial intelligence
, Article Fuel ; Volume 323 , 2022 ; 00162361 (ISSN) ; Shadabfar, M ; Huang, H ; Leung, Y. F ; Uchida, S ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Natural gas hydrate, a crystalline solid existing under high-pressure and low-temperature conditions, has been regarded as a potential alternative energy resource. It is globally widespread and occurs mainly inside the pores of deepwater sediments and sediments under permafrost area. Hydrate production via well depressurization is deemed well-suited to existing technology, in which the pore pressure is lowered, the natural gas hydrate is dissociated into water and gas, and the water and gas are produced from well. This method triggers multiphysics processes such as fluid flow, heat transfer, energy adsorption, chemical reaction and sediment deformation, all of which are dependent on the...
Multi-criteria decision making for integrated urban water management
, Article Water Resources Management ; Volume 22, Issue 8 , 2008 , Pages 1017-1029 ; 09204741 (ISSN) ; Abrishamchi, A ; Ardakanian, R ; Sharif University of Technology
2008
Abstract
The city of Zahedan, in South-eastern Iran, has high population growth, limited local freshwater resources and inadequate water distribution system resulting in water supply failures in recent years. This paper will investigate integration of several demand management measures such as leakage detection on water distribution network, water metering and low volume water fixtures as well as the conjunctive use of surface and groundwater resources of this city. For integration of water management criteria, compromise programming will be used as a multi-objective decision making method. The criteria include minimizing the cost, maximizing water supply and minimizing the social hazards due to the...
A novel shape memory alloy-based element for structural stability control in offshore structures under cyclic loading
, Article Ships and Offshore Structures ; Volume 15, Issue 8 , 2020 , Pages 844-851 ; Alam, M. S ; Seethaler, R. J ; Zabihollah, A ; Sharif University of Technology
Taylor and Francis Ltd
2020
Abstract
Wind and ocean waves highly influence the performance and functionality of structures, requiring an efficient control element. The structural behavior of one of the most recent structural control elements, namely shape memory alloys (SMA)-based control element, under cyclic loadings of oceans waves, has been investigated. Shape memory alloys are one of the attractive smart materials with the ability to return to the initial shape after experiencing large deformation. Experimental tests have been conducted to study the effects of cyclic loads on several specimens of the SMA wires. The SMA wires are being used in the SMA-based structural control system to dissipate the energy of external...
A semi-active SMA-MRF structural stability element for seismic control in marine structures
, Article Applied Ocean Research ; Volume 100 , 2020 ; Zabihollah, A ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
The stability and integrity of structures under indeterminant external loadings, particularly earthquakes, is a vital issue for the design and safe operation of marine and offshore structures. Over the past decades, many structural control systems, such as viscous-based systems, have been developed and embedded in marine and offshore structures, particularly oil platforms to maintain the stability and mitigate the seismic hazards. Rapid improvement in intelligent materials, including shape memory alloys (SMAs) and Magnetorheological fluid (MRF), have led to the design and development of efficient structural control elements. The present work aims to establish a framework for the structural...
A study of pre-straining shape memory alloy (SMA)-based control elements subject to large-amplitude cyclic loads
, Article Ships and Offshore Structures ; 2020 ; Zabihollah, A ; Sharif University of Technology
Taylor and Francis Ltd
2020
Abstract
Dynamic environmental loads, such as winds and waves, make the stability of offshore structures at high risk, requiring reliable yet efficient control elements to ensure the stability of such structures under lateral loads. Among the variety of control elements that have been developed to enhance the stability of a structure, shape memory alloy (SMA)-based control elements are promising as they are low-cost, easy to embed into the main control element, and do not need an external power supply. However, cyclic loads may highly influence the performance and functionality of SMA-based elements. The present work investigates the effects of pre-straining SMA components in energy dissipation...
Comparison of different univariate and multivariate geostatistical methods by porosity modeling of an iranian oil field
, Article Petroleum Science and Technology ; Volume 29, Issue 19 , 2011 , Pages 2061-2076 ; 10916466 (ISSN) ; Masihi, M ; Salahshoor, K ; Sharif University of Technology
2011
Abstract
Geostatistical methods are grouped in two main divisions: univariate and multivariate. When there is adequate amount of primary data, univariate methods such as kriging and SGS give a good representation of property distribution in the reservoir, but practical difficulties appear when there is no sufficient data. In such a case it is necessary to choose multivariate geostatistical methods in which some covariables are contributed to model the primary variable. Multivariate geostatistics is a broad term that encompasses all geostatistical methods that utilize more than one variable to predict some physical property of the earth. Bivariate geostatistics is obviously the simplest subset of the...
Experimental study of the chemical stimulation of Iranian fractured carbonate reservoir rocks as an EOR potential, the impact on spontaneous imbibition and capillary pressure
, Article Scientia Iranica ; Volume 17, Issue 1 C , 2010 , Pages 37-45 ; 10263098 (ISSN) ; Bastani, D ; Badakhshan, A ; Sharif University of Technology
2010
Abstract
Beside their worldwide abundance, oil recovery from fractured carbonate reservoirs is commonly low. Such reservoirs are usually oil-wet, thus, waterflooding leads into early breakthrough and low recovery due to the high conductivity of the fracture network, negative capillary pressure of the matrix and, consequently, the poor spontaneous imbibitions of water from fractures into the matrix during the course of waterflooding. In such problematic reservoirs, changing the wettability of the matrix toward water-wetness can improve spontaneous imbibition by changing the sign and, thus, the direction of capillary forces, resulting in an improvement of waterflood efficiency and, consequently, oil...
Visual investigation and modeling of asphaltene precipitation and deposition during CO2 miscible injection into oil reservoirs
,
Article
Fuel
;
Volume 160
,
2015
,
Pages 132-139
;
00162361 (ISSN)
; Dashti, H
; Ayatollahi, S
;
Sharif University of Technology
Elsevier Ltd
2015
Abstract
Abstract Miscible carbon dioxide (CO2 ) flooding has become the most commonly and favorable approach in Enhanced Oil Recovery (EOR) because of its high oil reservoir sweep efficiency and contribution to the reduction of greenhouse gas emissions. Despite this, it can significantly favor the asphaltene deposition, which leads to the wettability reversal and formation damage. A novel experimental setup was utilized to study asphaltene deposition on the model rock at reservoir condition. The evolution of asphaltene deposition was monitored by a microscope; then analyzed by image processing software to check the amount of deposited asphaltene and its size distribution at different...
Relative permeability measurement in carbonate rocks, the effects of conventional surfactants vs. Ionic liquid-based surfactants
, Article Journal of Dispersion Science and Technology ; Volume 41, Issue 12 , 2020 , Pages 1797-1811 ; Faraji, D ; Rahnama, Y ; Zeinolabedini Hezave, A ; Ayatollahi, S ; Sharif University of Technology
Bellwether Publishing, Ltd
2020
Abstract
In the present study, the effect of two different kinds of surfactants namely conventional (Sodium dodecyl benzene sulfonate (SDBS)) and ionic liquid (IL)-based surfactants are investigated on the tertiary oil recovery using relative permeability concept. In this way, besides the Amott wettability index measurement, unsteady state core flooding tests are performed to not only find the effect of surfactant injection on tertiary oil recovery, but also to investigate their effects on relative permeability of carbonate rocks. In addition, for more reliable conclusions regarding the possible mechanisms, interfacial tension (IFT), compatibility and emulsification tests are carried out as a...
Application of multi-criterion robust optimization in water-flooding of oil reservoir
, Article Journal of Petroleum Science and Engineering ; Volume 109 , September , 2013 , Pages 1-11 ; 09204105 (ISSN) ; Pishvaie, M. R ; Khorasheh, F ; Salahshoor, K ; Kharrat, R ; Sharif University of Technology
2013
Abstract
Most of the reported robust and non-robust optimization works are formulated based on a single-objective optimization, commonly in terms of net present value. However, variation of economical parameters such as oil price and costs forces such high computational optimization works to regenerate their optimum water injection policies. Furthermore, dynamic optimization strategies of water-flooding often lack robustness to geological uncertainties. This paper presents a multi-objective while robust optimization methodology by incorporating three dedicated objective functions. The goal is to determine optimized and robust water injection policies for all injection wells. It focuses on reducing...