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Total 70 records
Investigation of Formation Damage with Oil-Based Mud (Invert Emulsion) Using Microfluidic Method
, M.Sc. Thesis Sharif University of Technology ; Mahani, Hassan (Supervisor)
Abstract
Formation damage is one of the most important challneges in hydrocarbon production; drilling mud invasion is one of its common types. This damage is caused by the penetration of the drilling fluid into the porous media, which its filtrate and solid pareticles block the pores and cause permeability reduction. The main purpose of this thesis is to investigate the pore-scale mechanisms of the formation damage induced by invert-emulsion drilling fluid and to investigate the effect of adding nanoparticles to the drilling fluid on the severity of the damage using microfluidic technique. According to the latest published articles, there has not been any research conducted at the pore-scale with...
Characterization of Formation Damage Induced by Oil-Based Drilling Fluid and Proposing its Optimized Remedy
, M.Sc. Thesis Sharif University of Technology ; Masihi, Mohsen (Supervisor) ; Tahmasbi, Koroush (Supervisor) ; Kalhor, Mojtaba (Co-Supervisor)
Abstract
During all operations in hydrocarbon reservoirs, there is a possibility of formation damage. These damages can reduce the production of fluids from reservoir. One of the major damages that can seriously affect the performance of a reservoir is the damage caused by drilling fluid. The main purpose of this research is to study the main mechanisms of formation damages when using oil-based drilling fluids and fixing or preventing these damages. Once the mechanisms are identified, it is tried to cure the damages but without acid-washing. The alternative method is surfactant-washing which is a surfactant-brine injection. This injection has been done for the first time. This study helps to industry...
Investigating the Effect of Drilling Fluid Properties and its Compositions on the Mud Loss Mechanism
,
M.Sc. Thesis
Sharif University of Technology
;
Shad, Saeed
(Supervisor)
;
Zahedi Far, Amir
(Co-Supervisor)
Abstract
Currently, one of the most important problems in the field of drilling is the issue of drilling fluid loss in different formations. The problem of mud loss has been evident since the beginning of oil and gas well drilling operations, so that oil companies spend millions of dollars annually to solve the problem of mud loss. Problems such as pipe jamming, loss of rig production time, well blowout, loss of a large volume of drilling mud and damage to reservoir formations due to loss of drilling fluid are caused. Regarding the drilling variables, many factors cause the decrease or increase of the loss, the most important of which are the weight on the drill bit, drilling speed, the rate of...
Investigation on Effects of Nanoparticles Presence on Hydrate Formation Characterization During Drilling
, M.Sc. Thesis Sharif University of Technology ; Mohammadi, Ali Asghar (Supervisor) ; Zarenezhad, Bahman (Co-Advisor) ; Ramazani, Ahmad (Co-Advisor)
Abstract
In past two decades, the direction of oil and gas exploration has moved towards deep water drilling. The pressure and temperature in these zones are ideal for gas hydrate formation that can cause serious and sometimes uncontrollable issues during drilling operations. Gas hydrate formation while drilling can cause problems such as occurrence of kick and blowout, plug chock and kill line, and change in rheology of drilling mud. On the other hand, nowadays, nanotechnology has created an evolution in engineering sciences and because of the wide range of this science, drilling industry is affected like other industries. In the meantime, because of high yield, high stability and various methods of...
Simulation of Drilling Fluid Movement Using Neural Network Modeling and Comparison with CFD Methods
, M.Sc. Thesis Sharif University of Technology ; Jamshidi, Saeid (Supervisor)
Abstract
We report on numerical and intelligent modeling of three-dimensional laminar flow of non-Newtonian fluids driven by axial pressure gradient in annular media consisting of a coaxially rotating inner cylinder. This is an example of a rotating Couette flow with vast applications in food, oil and gas, and chemical engineering industries. We study the dynamics of pressure in and the velocities (in three directions X, Y and Z) of every grid in presence of rotation and without that by means of CFD. Afterward, we develop a novel predictive model based on an Artificial Neural Network (ANN). The hybrid ANN framework is trained and tested by over 100000 data which collected by CFD. We then perform...
Investigating the rheological properties of nanofluids of water/hybrid nanostructure of spherical silica/MWCNT
, Article Thermochimica Acta ; Volume 578 , 20 February , 2014 , Pages 53-58 ; ISSN: 00406031 ; Rashidi, A ; Soleimanisalim, A. H ; Rashtchian, D ; Sharif University of Technology
Abstract
Regarding the importance of rheological properties of water based drilling fluids, the effects of silica nanospheres, multiwall carbon nanotubes (MWCNTs) and two types of their hybrid, i.e. H1 (80 wt.% silica nanosphere/20 wt.% MWCNT) and H2 (50 wt.% silica nanosphere/50 wt.% MWCNT) on the viscosity and density of distilled water were investigated. According to the results, viscosity and density of the nanofluids increased with the concentration, while they were reduced by increasing the temperature. At high concentrations, the least increase in the viscosity of distilled water by adding the nanomaterials is related to H2 (8.2% increase at 1.0 wt.%). Likewise, the optimum operating...
The preparation and rheological investigation of polymer and hydrogel modified drilling mud
, Article Petroleum Science and Technology ; Volume 30, Issue 10 , 2012 , Pages 1059-1068 ; 10916466 (ISSN) ; Ramazani, S. A. A ; Khosravi, N ; Sharif University of Technology
2012
Abstract
The authors carried out the study to prepare chitosan N-isopropylacrylamide hydrogel via heating and radiation processes. Properties investigation of prepared samples revealed that radiation prepared samples show higher yield and swelling ratios in comparison with the heating prepared ones. Effects of hydrogel addition to drilling mud on its important rheological properties such as apparent viscosity, plastic viscosity, and stress-strain behavior are measured. The rheological properties of hydrogel were compared with cellulosemethylcarboxyl and resins that are widely used in drilling fluid. The results demonstrate that whereas linear polymer effects on mud properties are more significant in...
Herschel-Bulkley rheological parameters of lightweight colloidal gas aphron (CGA) based fluids
, Article Chemical Engineering Research and Design ; Volume 93 , 2015 , Pages 21-29 ; 02638762 (ISSN) ; Arabloo, M ; Ghazanfari, M. H ; Rashtchian, D ; Sharif University of Technology
Institution of Chemical Engineers
2015
Abstract
The proper understanding of rheological characteristics of CGA based fluids is of crucial importance in determining the performance of the fluid, in order to maintain the most effective fluid properties for safe, efficient, and economical drilling operation. This paper presents a concise investigation on the effect of concentration of the three main components of a novel environmentally friendly lightweight CGA based drilling fluid, i.e., xanthan gum biopolymer, starch, and biosurfactant, to the Herschel-Bulkley rheological model parameters. The three parameters of Herschel-Bulkley model, i.e., yield stress, fluid consistency, and fluid flow index were calculated by fitting the experimental...
Effect of nanoclay on improved rheology properties of polyacrylamide solutions used in enhanced oil recovery
, Article Journal of Petroleum Exploration and Production Technology ; Volume 5, Issue 2 , June , 2015 , Pages 189-196 ; 21900558 (ISSN) ; Khalili Nezhad, S. S ; Kamari, M ; Hemmati, M ; Masihi, M ; Bazgir, S ; Sharif University of Technology
Springer Verlag
2015
Abstract
Recently, a renewed interest arises in the application of nanotechnology for the upstream petroleum industry. In particular, adding nanoparticles to fluids may drastically benefit enhanced oil recovery (EOR) and improve well drilling, by changing the properties of the fluid, rocks wettability alteration, advanced drag reduction, strengthening the sand consolidation, reducing the interfacial tension and increasing the mobility of the capillary trapped oil. In this study, we focus on roles of clay nano-particles on polymer viscosity. Polymer-flooding schemes for recovering residual oil have been in general less than satisfactory due to loss of chemical components by adsorption on reservoir...
The Effects of Various Parameters on Wellbore Stability During Drilling Through Shale Formations
, Article Petroleum Science and Technology ; Volume 33, Issue 12 , 2015 , Pages 1275-1285 ; 10916466 (ISSN) ; Ghotbi, C ; Pishvaie, M. R ; Sharif University of Technology
Taylor and Francis Inc
2015
Abstract
Field evidence indicates that the thermal and chemical regimes in wellbore considerably affect the wellbore stability. This study presents a general coupled model for transport of solute, solvent and heat including their combined effects on the wellbore stability. Optimization of drilling fluid parameters is crucial for wellbore stability analysis particularly in high pressure-high temperature environments. The coupled effects of chemical potential and temperature gradients on fluid flow significantly change the pore pressure and stress around a borehole. The effects of various parameters such as mud weight, solute concentration gradient, shale properties, and temperature gradient on...
Fully coupled analysis of interaction between the borehole and pre-existing fractures
, Article International Journal of Rock Mechanics and Mining Sciences ; Volume 89 , 2016 , Pages 151-164 ; 13651609 (ISSN) ; Goodarznia, I ; Shadizadeh, S. R ; Sharif University of Technology
Elsevier Ltd
2016
Abstract
The coupling of rock and thermal stresses along with fluid pressure are particularly important in fractured rock masses, since stress-induced changes in permeability can be large and irreversible under perturbations resulting from various natural and induced activities. A new method is presented to model fracture permeability changes during drilling in fractured rocks. The approach includes finite element method (FEM) for fully coupled thermo-poroelastic analysis of stress distribution around borehole and displacement discontinuity method (DDM) to model fracture deformation. Three cases of overbalanced, underbalanced, and balanced drilling fluid pressure conditions are employed. The...
Experimental investigation of self-repeating effect of different nanoparticles on internal mud cake formation by water-based drilling fluid in directional wells
, Article Drilling Technology Conference 2016, 22 August 2016 through 24 August 2016 ; 2016 ; 9781613994504 (ISBN) ; Shahbazi, K ; Ghazanfari, M. H ; Zargar, G ; Sharif University of Technology
Society of Petroleum Engineers
Abstract
In this paper, the impact of three parameters including nanoparticles geometry, particles aggregation and borehole inclination on induced formation damage from water based drilling fluids were investigated by means of experimental studies. Accordingly, we designed a dynamic filtration setup capable to rotate and change well inclination. Nano-based drilling fluids consisting of spherical, cubical and tubular shapes nanoparticles as fluid loss additives were used. Mud cake quality, core permeability impairment and degree of formation damage at various well inclinations were examined. The cluster structure of aggregated particles were determined using fractal theory and applying dynamic light...
The impact of nanoparticles geometry and particle size on formation damage induced by drilling nano-fluid during dynamic filtration
, Article Journal of Nano Research ; Volume 43 , 2016 , Pages 81-97 ; 16625250 (ISSN) ; Shahbazi, Kh ; Ghazanfari, M. H ; Zargar, Gh ; Sharif University of Technology
Trans Tech Publications Ltd
2016
Abstract
In this paper, the impact of three parameters including nanoparticles geometry, particles aggregation and borehole inclination on induced formation damage from water based drilling fluids were investigated by means of experimental studies. Accordingly, we designed a dynamic filtration setup capable to rotate and change well inclination. Nano-based drilling fluids consisting of spherical, cubical and tubular shapes nanoparticles as fluid loss additives were used. Mud cake quality, core permeability impairment and degree of formation damage at various well inclinations were examined. The cluster structure of aggregated particles were determined using fractal theory and applying dynamic light...
Nonlinear vibration analysis of directional drill string considering effect of drilling mud and weight on bit
, Article Journal of Vibroengineering ; Volume 18, Issue 2 , 2016 , Pages 1280-1287 ; 13928716 (ISSN) ; Monfared, V ; Daneshmand, S ; Abedi, E ; Sharif University of Technology
Vibromechanika
2016
Abstract
In this paper a nonlinear dynamic model for drill string in inclined well drilling is developed. Effects of drilling mud flow rate, weight on bit, angular velocity along with viscous damping on stability and vibration of the drill string are studied. Findings indicate the nonlinear effects are significant on the results. The effects of drilling mud flow rate and weight on bit on the natural frequencies and time responses are evaluated. Enhancement of drilling mud flow rate results in decreasing of natural frequencies and vibrational amplitude, while increasing the weight on bit, leads to decrease of the natural frequencies and increase the vibrational amplitude. © JVE INTERNATIONAL LTD
High molecular weight polyacrylamide nanoparticles prepared by inverse emulsion polymerization: reaction conditions-properties relationships
, Article Colloid and Polymer Science ; Volume 294, Issue 3 , 2016 , Pages 513-525 ; 0303402X (ISSN) ; Ramazani S. A ; Shaban, M ; Ayatollahi, S ; Tomovska, R ; Sharif University of Technology
Springer Verlag
2016
Abstract
High molecular weight polyacrylamide (PAM) nanoparticle dispersions are products with wide application possibilities, the most important of which is in petroleum industry such as drilling fluid and flooding agent in enhanced oil recovery. For that aim, it is necessary to achieve complete control of the final dispersion and polymer properties during the synthesis step. In this work, PAMs were synthesized by inverse emulsion polymerization of aqueous acrylamide solution in cyclohexane in the presence of emulsifier mixture of Span 20 and Span 80. We present a comprehensive study of the effects of variation of all important reaction conditions (agitation rate, reaction time and temperature,...
A review on impacts of drilling mud disposal on environment and underground water resources in south of Iran
, Article Proceedings of the SPE/IADC Middle East Drilling Technology Conference and Exhibition, 26 October 2009 through 28 October 2009 ; 2009 , Pages 447-454 ; 9781615677450 (ISBN) ; Dashtian, H ; Paiaman Mirzai, A ; Al Anazi, B. D ; Sharif University of Technology
Abstract
In drilling oil wells a system of complex fluids and chemical additives is used. Losses of these fluids in the well during drilling or disposal of them in well site could transfer pollutants to groundwater. In the present study a number of well sites, located in South of Iran, were studied to indicate types and magnitude of various pollutant materials that remain in the environment undestroyed and have considerable impacts on the underground water resources. Hydrocarbons used in Oil Base Muds (OBM) that can't be biodegrade readily in nature found to be the most severe pollutant material caused by disposal of Drilling Mud and Cuttings. Volume of drilling waste for these oil wells evaluated to...
Application of Hydrated Basil Seeds (HBS) as the herbal fiber on hole cleaning and filtration control
, Article Journal of Petroleum Science and Engineering ; Volume 152 , 2017 , Pages 212-228 ; 09204105 (ISSN) ; Vasheghani Farahani, M ; Jamshidi, S ; Sharif University of Technology
Elsevier B.V
2017
Abstract
Application of the fiber contained fluids has been extensively increased in many industries. In the petroleum industry, fibrous fluids are utilized for different applications. For instance, they have been applied in drilling operations for hole cleaning and cutting removal. In this article, the results of the studies performed on the application of Hydrated Basil Seeds (HBS) as the herbal eco-friendly fiber on hole cleaning and filtration control were presented. In order to investigate the application of HBS on hole cleaning, Polyacrylamide (PA) was added to the pure water to provide the base fluid and HBS at different concentrations were suspended in the base fluid and the effect of HBS on...
Improvement of non-aqueous colloidal gas aphron-based drilling fluids properties: role of hydrophobic nanoparticles
, Article Journal of Natural Gas Science and Engineering ; Volume 42 , 2017 , Pages 1-12 ; 18755100 (ISSN) ; Ghazanfari, M. H ; Sharif University of Technology
Abstract
Application of the colloidal gas aphrons (CGAs) in minimizing formation damage by plugging pore mechanism is now wildly accepted due to numerous successful field experience. One of the pivotal factors which affects the pore blockage ability of micro-bubbles is their stability. This experimental study tries to investigate the possible synergistic effect of nanoparticles on improving the stability and other properties of non-aqueous CGA drilling fluids, in both bulk and porous media. In particular, two types of hydrophobic nanoparticles including silicon dioxide nanopowder coated with 2 wt% Silane and nanoclay, in presence of a treated version of bentonite (Bentone 34) as a stabilizer and...
Monitoring the role of polymer and surfactant concentrations on bubble size distribution in colloidal gas aphron based fluids
, Article Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 556 , 2018 , Pages 93-98 ; 09277757 (ISSN) ; Kazemzadeh, E ; Kamari, E ; Ghazanfari, M. H ; Soleymani, M ; Sharif University of Technology
Elsevier B.V
2018
Abstract
Colloidal gas aphron (CGA) based fluids have recently been introduced to develop depleted hydrocarbon reservoirs due to their ability in controlling fluid losses. Bubbles size of CGAs plays an important role in pore blockage ability as the controlling mechanism in fluid invasion reduction. However, fundamental understanding of how bubble size distribution is controlled by polymer and surfactant concentrations is not well discussed in the available literature. Almost all reported experiences on CGAs sizing were conducted on single bubble behavior, and little attention has been given to the variation of bubble size distribution (BSD) of CGAs at different levels of polymer/surfactant...
Estimating the drilling fluid density in the mud technology: Application in high temperature and high pressure petroleum wells
, Article Heavy Oil: Characteristics, Production and Emerging Technologies ; 2017 , Pages 285-295 ; 9781536108675 (ISBN); 9781536108521 (ISBN) ; Gharagheizi, F ; Shokrollahi, A ; Arabloo, M ; Mohammadi, A. H ; Sharif University of Technology
Nova Science Publishers, Inc
2017
Abstract
Appropriate execution of drilling operation, in particular for high pressure and high temperature wells, requires accurate knowledge of behavior of the drilling fluid density as a function of pressure and temperature. In this communication, a novel mathematicalbased approach is presented to develop a reliable model for predict the density of four drilling fluid including water-based, oil-based, Colloidal Gas Aphron (CGA) and synthetic. To pursue our objective, a predictive model is proposed using a robust soft computing approach namely least square support vector machine (LSSVM) modeling optimized with coupled simulated annealing (CSA) optimization tool. Moreover, leverage approach, in which...