Geomechanical analysis of an oil field: numerical study of wellbore stability and reservoir subsidence

, Article Petroleum Research ; Volume 8, Issue 3 , 2023 , Pages 350-359 ; 20962495 (ISSN) Shad, S ; Kolahkaj, P ; Zivar, D ; Sharif University of Technology

KeAi Publishing Communications Ltd 2023

Abstract

Geomechanics as the knowledge of rock deformation and stability is an indispensable part of all field development plans. Conducting geomechanical analyses leads to a safer and more efficient operation otherwise different kinds of instability and distortion might occur. In this study, the geomechanical behavior of Ilam and Sarvak formations of an oil field in southwest of Iran was investigated. The research objectives can be summarized as wellbore stability evaluation and predicting the value of reservoir subsidence due to pressure drop as a result of reservoir fluid production. To fulfill these, a set of petrophysical logs run in the exploration well of this green field were collected. Next,...

Folate conjugated hyaluronic acid coated alginate nanogels encapsulated oxaliplatin enhance antitumor and apoptosis efficacy on colorectal cancer cells (HT29 cell line)

, Article Toxicology in Vitro ; Volume 65 , 2020 Movahedi Shad, P ; Zare Karizi, S ; Safaie Javan, R ; Mirzaie, A ; Noorbazargan, H ; Akbarzadeh, I ; Rezaie, H ; Sharif University of Technology

Elsevier Ltd 2020

Abstract

Oxaliplatin (OXA) has been widely used for treatment of colorectal cancer. In this study, to enhance antitumor and apoptosis efficacy, OXA was encapsulated in a novel folate conjugated hyaluronic acid coated alginate nanogels (F/HA/AL/OXA). The F/HA/AL/OXA nanogels were prepared by cross-linking process. The physico-chemical properties of F/HA/AL/OXA nanogels were characterized using scanning electron microscopy, transmission electron microscopy, fourier transform infrared spectroscopy, dynamic light scattering, and fluorescent spectrophotometry. The in-vitro antitumor activity of free OXA, AL, HA/AL, HA/AL/OXA and F/HA/AL/OXA nanogels were assessed using MTT assay against colorectal cancer...

Numerical Modeling of Solid Transport in a Transparent Fracture

, M.Sc. Thesis Sharif University of Technology Shad, Ehsan (Author) ; Shad, Saeed (Supervisor) ; Zivar, Davood (Co-Supervisor)

Abstract

Hydraulic fracturing, as an industry-leading technology, has proven to be very efficient in increasing the productivity of oil and gas wells. Therefore, this technology has been taken into attention in recent years and the number of hydraulic fracturing operations has been increasing. In order to enhance the efficiency of this technology, the final transmissibility of the fracture needs to be at the maximum possible value. To do so, proppant injection is the most common way to maintain a fracture open. To achieve a successful hydraulic fracture operation, detailed knowledge of the particle's transport and distribution inside the fracture is needed.In this study, a static fracture geometry...

Effect of plasma electrolytic oxidation on joining of AA 5052 aluminium alloy to polypropylene using friction stir spot welding

, Article Surface and Coatings Technology ; Volume 313 , 2017 , Pages 274-281 ; 02578972 (ISSN) Aliasghari, S ; Ghorbani, M ; Skeldon, P ; Karami, H ; Movahedi, M ; Sharif University of Technology

Elsevier B.V 2017

Abstract

The effect of a plasma electrolytic oxidation (PEO) pre-treatment on joining of AA 5052 aluminium alloy and polypropylene by friction stir spot welding (FSSW) is investigated using lap tensile shear tests. Two surface conditions of the AA 5052 alloy are compared, one with a PEO pre-treatment in a silicate-based electrolyte, another without any pre-treatment. The resultant specimens are examined by high resolution scanning electron microscopy, thermogravimetric analysis and attenuated total reflectance-infrared spectroscopy. The PEO treatment generated a thermally-insulating, porous ceramic coating, which has a highly porous, rough surface that is favourable for incorporating polypropylene...

Experimental Study on Fluid Loss and its Effect on Permeability

, M.Sc. Thesis Sharif University of Technology Zamani, Hossein (Author) ; shad, Saeed (Supervisor)

Abstract

In order to prevent a blow out, cooling the bit, displacement of drilling particle, etc., it is necessary to use a suitable fluid called drilling mud. The construction of drilling mud, especially the oil base, has a high cost and covers more than 20% of drilling costs, so maintaining and proper use of it is important, as well as drilling the reservoir layer due to the higher permeability of this layer than Other layers allow the drilling mud to influx into the formation, which in addition to the cost of fluid loss, damage to the reservoir, reduce its permeability and many problems during production. Therefore, in order to investigate the phenomenon of fluid loss, measure its size and...

Geomechanical Analysis of Sand Production

, M.Sc. Thesis Sharif University of Technology Zivar, Davood (Author) ; Shad, Saeed (Supervisor)

Abstract

Production of solid particles is a phenomenon that occurs in most oil and gas well. This phenomenon can cause many problems in every life stage of a well such as erosion of surface equipment, subsurface equipment and environmental problems associated with solid particles disposal. On the other hand, this phenomenon can increase the permeability of near wellbore areas, which is considered to be the advantages of solid particles production. In this study, nine sandstone samples were prepared and different pressure ratios have been used for evaluation production of sand in different situations. Also, in the next step, by numerical simulations, studies of stresses around a well and...

Design and Modeling of the Cement Setting Time

, M.Sc. Thesis Sharif University of Technology Safaee, Reza (Author) ; Shad, Saeed (Supervisor)

Abstract

Cementing plays a crucial role in ensuring the long-term integrity of oil and gas wells, geothermal wells, and geologic sequestration (GS). The productivity of the well is directly impacted by the quality of cementing operations throughout its lifecycle, spanning drilling, production, and abandonment phases. This thesis focuses on modeling cement setting under varying pressure and temperature conditions within wells. It aims to accurately estimate the thickening time of cement slurry, and analyze the influence of thermodynamic factors like pressure, temperature, and heat generated by hydration reactions on the cement setting process through laboratory investigations. The study also delves...

Experimental Investigation of Brine Salinity Effect on Relative Permeability Curve in Tight Reservoir

, M.Sc. Thesis Sharif University of Technology Zeinolabedin, Roham (Author) ; Shad, Saeed (Supervisor)

Abstract

An experimental study was conducted to investigate the reduction of relative permeability caused by salt precipitation. Series of isothermal sand pack flood experiments were conducted on a sand pack composed of several minerals and relative permeability of the involved phases were determined. This compose was taken south of Iranian reservoir properties. A stainless steel sand-pack of 2.5cm internal diameter and 19.2 cm long was designed and built for experimental procedure. There are is different methods to determine relative permeability of porous media, According to available facilities in the lab and objective of this study unsteady state have been chosen to determine relative...

Modeling of Dynamic Kill in Gas-Condensate Well

, M.Sc. Thesis Sharif University of Technology Daneshpajouh, Abouzar (Author) ; Shad, Saeed (Supervisor)

Abstract

By exploring huge gas-condensate reservoirs, three-phase transient flow modeling demonstrates its crucial role in designing dynamic kill, relief well parameters and kill procedure of such wells. Controlling gas-condensate well needs robust transient three phase models capable of capturing discontinuities in density, geometry and velocity of phases. In this paper, two phase Advection-Upstream-Splitting-Method hybrid scheme is extended to three-phase model capable of modeling blowout and dynamic kill in gas-condensate-water wells. Density and viscosity changes are calculated using Peng-Robinson equation of state and in according, flow model parameters are corrected.The capability of this model...

Experimental Investigation of Formation Damage Caused by Polymer Mud

, M.Sc. Thesis Sharif University of Technology Mahdipoor, Morteza (Author) ; Shad, Saeed (Supervisor)

Abstract

In oil industry, increment of drilling mud viscosity is of great importance. Water based polymers are widely use as drilling fluid to achieve this goal. Formation damages can be occurred by invading polymer solution into the formation in different ways such as scale and precipitation. These damages appear in different shapes such as reduction in relative permeability and productivity index reduction. In this study we have proposed, designed and fabricated a novel device, called sand pack, to measure the damage of the reservoir which enable us to calculate relative permeability and recovery factor by means of pressure difference and flow rate. Using this lab-scaled device we have measured...

Near wellbore thermal effects in a tight gas reservoir: Impact of different reservoir and fluid parameters

, Article Journal of Unconventional Oil and Gas Resources ; Volume 16 , 2016 , Pages 1-13 ; 22133976 (ISSN) Shad, S ; Holmgrün, C ; Calogirou, A ; Sharif University of Technology

Elsevier Ltd 2016

Abstract

Temperature changes in and around the wellbore could lead to significant well performance and flow assurance issues. Despite its importance, near wellbore temperature change due to gas production and its importance on well performance is not well understood. Reduction of temperature in the near well bore section, could potentially lead to hydrate formation and as a result reduction of well performance. This work is aimed at evaluating the thermal behaviour in the near wellbore region of a low to tight permeability gas reservoir (ranging between 0.02 and 10 mD) during its natural depletion. The study is conducted by using a thermal-compositional simulator. The process required to simulate...

Experimental investigation of two phase flow in horizontal wells: Flow regime assessment and pressure drop analysis

, Article Experimental Thermal and Fluid Science ; Volume 88 , 2017 , Pages 55-64 ; 08941777 (ISSN) Shams, R ; Tavakoli, A ; Shad, S ; Sharif University of Technology

Elsevier Inc 2017

Abstract

Multiphase flow is fundamental to different fields of engineering and science including petroleum engineering. In oil and gas, flow of multiple phases inside wells is a common phenomenon. In such conditions, petroleum engineers deal with different design and operational difficulties due to complexities involved in flow of multiple phases inside a well. Unlike flow of gas and liquid inside a well, the liquid-liquid flow inside a horizontal well has received rather less attention. This study is aimed at experimentally investigating multiphase flow in a horizontal well by using a 12 m length and 30 mm diameter well made of Plexiglas. Despite the importance of defining pattern transition...

Simulation Study of Inflow Control Device

, M.Sc. Thesis Sharif University of Technology Jokar, Mohammad Javad (Author) ; Shad, Saeed (Supervisor)

Abstract

Optimizing and improving the design of wells will have significant impact on any recovery method. As for horizontal wells, despite the fact that horizontal wells improve reservoir access, they suffer from significant pressure loss as well as limited flow control locations and flow control and management. In addition, reservoir quality varies along the length of the well and in the reservoir. This will add further complexity and challenge in well control and production optimization. The design of completions plays a significant role in improving the productivity of a well as well as the life of the reservoir. Intelligent or smart completions can be used to monitor, evaluate and manage the...

A Study on Two-Phase Flow in Bottom Hole Conditions in Horizontal Wells

, M.Sc. Thesis Sharif University of Technology Shenabi, Mohammad Amin (Author) ; Shad, Saeed (Supervisor)

Abstract

Considering the importance of oil and gas industries in Iran, issues related to drilling and exploitation of oil and gas fields are among the country's priorities and challenges in industries, research centers and universities, and extensive research is conducted in this field. Since during the process of oil production from oil wells and reservoirs, the formation of multiphase flows, including two-phase fluid flow, is inevitable, investigating the behavior of multiphase fluids, which is a branch of fluid mechanics, is of special importance. In this regard, in continuation of the research conducted in the Faculty of Chemical and Petroleum Engineering of Sharif University of Technology, in...

Simulation and Optimization of Downhole Pumps with Focus on IOR Application in Iranian Fields

, M.Sc. Thesis Sharif University of Technology Rajaei, Mohammad Mahdi (Author) ; Shad, Saeed (Supervisor)

Abstract

Three-dimensional (3D) computational fluid dynamics (CFD) was used in this study to investigate single and multi phase flow behavior related to three stages of ESP pump. Compared to experimental measurements, the numerical prediction for single phase flow of water is matched very well. Furthermore, the effects of viscosity and pump rotational speed for oil were investigated and the results show that by increasing oil viscosity and decreasing rotational speed, the pump head and efficiency reduced. ESP performance under two phase oil-methane flow and the effect of oil viscosity, rotational speed, intake pressure, gas bubble diameter, oil rate and gas volume fraction were studied. ESP boosting...

Geomechanical Model for Well Path Optimization Based on Inclination, Azimuth and ROP

, M.Sc. Thesis Sharif University of Technology Elahi Khaledi, Alireza (Author) ; Shad, Saeed (Supervisor)

Abstract

The wellbore instability increases the cost of drilling operations due to problems such as pipe sticking and lost circulation, so it is important to find the optimal well path. In this research, building a one-dimensional geomechanical model is investigated, and then the wellbore stability during drilling in different layers is evaluated. The geomechanical model is constructed using available data (well log data, mud logging unit data, and drilling reports) in a study reservoir and the optimal well path is determined by the appropriate inclination and azimuth using the geomechanical properties of the field and the stress regime, taking into account the wellbore stability and shear failure...

Experimental and CFD simulation of slurry flow in the annular flow path using two-fluid model

, Article Journal of Petroleum Science and Engineering ; Volume 198 , 2021 ; 09204105 (ISSN) Movahedi, H ; Jamshidi, S ; Sharif University of Technology

Elsevier B.V 2021

Abstract

The current study is allocated to experimental evaluation of the multiphase flow of fine solid particles (FSPs) as well as comprehensive numerical study in an annular space under static, laminar, and turbulent flow conditions with consideration of the inner pipe eccentricity and rotation. The experimental investigation was carried out using an annular pipe flow loop. The numerical modeling and simulation of the multiphase flow in the annular space have been performed using the Euler-Euler approach. The unsteady-state multiphase model based on the kinetic theory of granular flow (KTGF) is developed to investigate the particulate flow characteristics in the annular space. Moreover, Standard...

New insight into hydrodynamic and cake erosion mechanism during rotating-disk dynamic microfiltration of concentrated bentonite suspensions at different salinity conditions

, Article Separation and Purification Technology ; Volume 300 , 2022 ; 13835866 (ISSN) Movahedi, H ; Jamshidi, S ; Sharif University of Technology

Elsevier B.V 2022

Abstract

The present study investigates the dynamic filtration of concentrated slurry fluids containing colloidal clay particles under different salinity, shear flow, and flux rate conditions. The dynamic filtration study was carried out by the filtration cell equipped with a rotating disk to apply shear stress over the membrane surface. A 3D CFD simulation has been implemented to model the hydrodynamic flows inside the filtration cell to obtain the wall shear stress (WSS) on the membrane surface at different disk rotation speeds. The thickness and surface patterns of fouling were captured utilizing a surface profilometer. First, the cake-filtration model was used to predict the flux rate and fouling...

Assessment of Seismic Retrofit Policies for Buildings

, M.Sc. Thesis Sharif University of Technology Movahedi, Ali (Author) ; Kashani, Hamed (Supervisor)

Abstract

Occurrence of natural disasters such as earthquake could seriously damage most buildings especially those with insufficient resistance located in urban worn-out textures. In order to reduce unpleasant consequences of an earthquake, appropriate policies need to be considered to persuade the beneficiaries to follow retrofitting standards in the process of planning, designing, and construction of buildings. These policies shall be implemented through institutions in arbitrary or obligatory forms, by encouragement or penalty mechanisms. In order to consider these policies, first of all we need to identify the beneficiaries and their particulars. By studying and considering subjects discussed in...

Simulation and Experimental Study of Permeability Reduction in Porous Media Due to Mud Filtrate Invasion Under Dynamic Conditions

, Ph.D. Dissertation Sharif University of Technology Movahedi, Hamed (Author) ; Jamshidi, Saeed (Supervisor)

Abstract

The reduction of the effective permeability of the reservoir rock in the production area due to various factors is called formation damage. Formation damage is always one of the topics discussed in petroleum engineering. Among the primary and important cases that lead to damage to the formation are the filtration of drilling mud into the production area and the deposition of colloidal particles inside the porous rock during the drilling operation. The length of the productive zone in contact with the drilling fluid usually reaches several hundred feet in Iranian formations. In this study, the aim is to more accurately estimate the amount of permeability reduction caused by the penetration of...