Search for: formation-damage
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    Effect of nanofluid treatment on water sensitive formation to investigate water shock phenomenon, an experimental study

    , Article Journal of Dispersion Science and Technology ; Volume 35, Issue 7 , 21 May 2014 , Pages 889-897 Habibi, A ; Heidari, M. A ; Al-Hadrami, H ; Al-Ajmi, A ; Al-Wahaibi, Y ; Ayatollahi, S ; Sharif University of Technology
    Permeability reduction in porous media as a result of frail and tenuous fine particles migration would decrease the productivity index in the subterranean reservoirs. During reservoir stimulation by injecting fluids into the reservoir, as the salinity condition of the formation brine changes, fine particles initiate the triggering process. In this study, MgO-based nanofluid as a fines fixation agent was stably prepared based on the particle size distribution and characterized through transmission electron microscopy analysis. Afterward, several core flooding tests were performed using Berea sandstone cores to study the effect of nanofluid injection on fines fixation in the water shock... 

    Data-driven approach for evaluation of formation damage during the injection process

    , Article Journal of Petroleum Exploration and Production Technology ; Volume 10, Issue 2 , 2020 , Pages 699-710 Shabani, A ; Jahangiri, H. R ; Shahrabadi, A ; Sharif University of Technology
    Springer  2020
    Waterflooding is among the most common oil recovery methods which is implemented in the most of oil-producing countries. The goal of a waterflooding operation is pushing the low-pressure remained oil of reservoir toward the producer wells to enhance the oil recovery factor. One of the important objects of a waterflooding operation management is understanding the quality of connection between the injectors and the producers of the reservoir. Capacitance resistance model (CRM) is a data-driven method which can estimate the production rate of each producer and the connectivity factor between each pair of wells, by history matching of the injection and production data. The estimated connectivity... 

    Experimental and Modeling Investigation of the Near Wellbore Asphaltene Deposition Damage Removal by Ultrasonic Waves

    , M.Sc. Thesis Sharif University of Technology Keshavarzi, Behnam (Author) ; Ghotbi, Cyrus (Supervisor) ; Ghazanfari, Mohammad Hossein (Co-Advisor)
    This work concerns with experimental and modeling investigation of the asphaltene damage removal using ultrasonic wave irradiation. A specific core holder apparatus was designed and utilized for in situ ultrasonic exposure to damaged core plug at different conditions of exposure time, ultrasound power and distances between sound source and plug. Injection of many pore volumes of an asphaltenic crude oil was used for creating asphaltene induced damaged in porous media through permeability measurements. The deposited asphaltene during oil injection as well as asphaltene removal due to ultrasonic exposure was evaluated using IP-143 analysis. The results revealed that ultrasound application... 

    Stimulating Asphaltenic Oil Reservoirs, Experimental Investigation of Asphaltenic Sludge Formation to Plan Its Prevention

    , M.Sc. Thesis Sharif University of Technology Sisakhti, Hossein (Author) ; Ayatollahi, Shahaboddin (Supervisor) ; Shad, Saeed (Supervisor)
    Formation damage is probable to occur while drilling, work-over operations, and well completion in near wellbore zone due to different reasons; which leads to excess pressure drop through this area. Well stimulation operations are proposed to remove these damages and improve oil production; among which, acidizing is known as a traditional applicable method to stimulate oil and gas wells. Although this approach is accepted and chosen as a well stimulation method to remove formation damages, its poor design and implementation results in new formation damages. One of these arises when acid contacts asphaltic oil, which causes asphaltene particle instability and asphaltic sludge rapid... 

    Investigation and Simulation of near Wellbore Damage Effect on Reservoir Fluid Flow

    , M.Sc. Thesis Sharif University of Technology Shams, Mosayeb (Author) ; Jamshidi, Saeed (Supervisor) ; Pishvaei, Mahmood Reza (Co-Advisor)
    Many petroleum engineering operations, such as drilling, well completions, and workover, may cause an alteration in the properties of hydrocarbon-bearing formations, including porosity and permeability. Solid and fluid influx into the reservoir in an overbalanced pressure condition can cause permeability reduction from formation damage in the invaded zone. While the solid invasion is limited to a few inches away from the wellbore, the fluids will invade significantly deeper into the formation. Therefore, the invasion of fluids may be considered as the primary mechanism that causes the near-wellbore damage. Correct quantification of the damage is an important component for predicting well... 

    Modeling of Ultrasonic Effect on Stimulation of Production well

    , M.Sc. Thesis Sharif University of Technology Khorram, Akbar (Author) ; Ramazani Sa’adat Abadi, Ahmad (Supervisor) ; Jamshidi, Saeid (Supervisor)
    Near wellbore formation damage is caused additional pressure drop around the wellbore and therefore decreased the oil or gas productivity of the well. The usual methods for removal of these damages are acidizing and hydraulic fracturing which have operational limitations in addition to high costs. Thus the researchers are motivated to find new methods and technologies specially the use of mechanical waves for well stimulation purposes.Ultrasonic waves have been extensively used in many industrial applications including clean devices, pipes and vessels. A clear extension of this usage is the removal of wellbore contaminants by exposing it to high-power ultrasonic waves. Although several... 

    Experimental Investigation of Factors Affecting Formation Damage through Aqueous Phase Trapping in Gas Reservoirs

    , M.Sc. Thesis Sharif University of Technology Mirzaei Paiaman, Abouzar (Author) ; Masihi, Mohsen (Supervisor) ; Moghadasi, Jamshid (Supervisor)
    Aqueous phase trapping (APT) in many of the oil and gas reservoirs is a significant mechanism of formation damage during drilling, completion, work over, and stimulation operation. APT can limit the productivity of the well to a high extent, especially in low permeable gas reservoirs. Experimental investigation of factors affecting APT is vital to recognize extends of associated damage and contribution of each factor. Albeit many experimental studies have been conducted as regards factors affecting removal of phase traps in understudy mechanism of formation damage, but up to date no experimental data has been published regarding effect of different factors on reservoir’s potential for APT.... 

    Experimental Investigation of Effect of Nanoparticles on Fines Migration Control in Porous Media

    , M.Sc. Thesis Sharif University of Technology Movahedi, Nasir (Author) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Taghikhani, Vahid (Supervisor)
    Fines migration due to their severe problems during oil production must be controlled. They cause the productivity decline due to their deposition near the well bore. Recently, application of nanotechnology in fine migration control has been much attended in both experimental and field case investigations. The main goal of the present study is to find out the ability and different effects of Nano particles (NPs) such as concentration, types and even the magnetic sensitivity to retain fines migration. In order for this, two groups of tests were conducted by engineered porous media. In this study, for the first time, an experimental setup was designed and constructed to investigate the control... 

    Experimental Study of Formation Damage Reduction during Drilling of Horizontal Wells Using Nanoparticles

    , M.Sc. Thesis Sharif University of Technology Shojaei, Nima (Author) ; Ghazanfari, Mohammad Hossein (Supervisor)
    One the basic challenges during drilling of both vertical and horizontal wellbores is due to mud filtrate invasion into the formation. Addition of nanoparticles to composition of drilling fluid has been recognized as a measure of control and reduction of filtrate invasion. Despite notable advances in formulation of nano-enhanced drilling fluids, effects of surface wettability of nanoparticles on their performance have not been studied with any precision. Moreover, return permeability of a grain packed porous media after extreme invasion by mud filtrate has not been experimentally measured in a radial system, yet. The last but not least, Generation and development of mud cake opposite the... 

    Numerical Modeling of Formation Damage Due to Filtrate Invasion into the Formation During Drilling Operations in Vertical and Horizontal Wells

    , M.Sc. Thesis Sharif University of Technology Khalili, Sajad (Author) ; Ghazanfari, Mohammad Hossein (Supervisor)
    Formation damage in oil and gas wells is mainly induced by drilling operations. Filtrate and particle invasion into formation as the sources of this damage caused serious problems, e.g. reduction of production rates. Therefore numerical modeling of this phenomenon helps us to better understand the process, and as a result, control and reduce formation damage associated with this impairment. In this research, a model to estimate the invasion depth and damage of mud filtrate from water-based mud is presented. Filtrate invasion into the formation is investigated by convection-diffusion equation with regard to dispersion term. The invasion depth is obtained from mud filtrate profile in the... 

    Experimental Investigation of Mud-Induced Formation Damage in Fractured Reservoirs

    , M.Sc. Thesis Sharif University of Technology Bagheri, Abdolhossein (Author) ; Rashtchian, Davood (Supervisor) ; Moghadasi, Jamshid (Supervisor)
    Productivity reduction of oil and gas wells due to mud induced permeability impairment is one of challenging problems in drilling and production studies. This phenomenon is of prime importance in fractured reservoirs in which high permeability fracture networks act as conduits for feeding gas or oil from a tight matrix to the wellbore. Up to now, many experimental and modeling investigations have been done in formation damage in conventional reservoirs. But in spite of large contribution of fractured reservoirs in total hydrocarbon reserves, there is very little work reported in the literature investigating formation damage in such reservoirs. In this thesis, the effective parameters in... 

    Experimental Investigation of Stimulation Fluid Induced Formation Dmaged Using Micromodel

    , M.Sc. Thesis Sharif University of Technology Mirkhoshhal, Mehdi (Author) ; Mahani, Hassan (Supervisor) ; Ayatollahi, Shahaboddin (Co-Supervisor)
    Acidizing as the most frequent stimulation technique in the field, has been extensively used to increase the production rate. Even though acidizing treatments is well established, there is still an inherent risk for self-induced formation damage through incompatibilities of the fluids involved in this process.
    A main potential problem during acidizing is the incompatibility of the acid and the reservoir’s crude oil. Acid interaction with crude oil can produce two major damage mechanisms that could offset partially, if not totally the benefit of the acid stimulation. These mechanisms are the rigid film emulsion formation and the acid-sludge precipitation, result in well productivity... 

    Acidizing Operation Design for Oil Fields by Use of Neural Network Method

    , M.Sc. Thesis Sharif University of Technology Masoumi, Abdolkhalegh (Author) ; Goodarznia, Iraj (Supervisor)
    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... 

    Experimental Investigation of Formation Damage Caused by Polymer Mud

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

    Experimental Investigation of Asphaltic Sludge Formation Caused by Asphaltenic Oil Carbonated Reservoir Acid Stimulation

    , Ph.D. Dissertation Sharif University of Technology Mohammadzadeh Shirazi, Meisam (Author) ; Ghotbi, Cyrus (Supervisor) ; Ayatollahi, Shahab (Supervisor)
    Acidizing is one of the most effective techniques to remove the formation damage and restore (or even increase) the permeability of the near wellbore region. Although this technique is widely used to resolve the skin problem, it could initiate new damages itself that hinder the fluid flow and decrease the well production, consequently. Acid-oil emulsion and sludge formation are known as two major induced formation damage and the main reasons for the oil well acid treatment failures.When the HCl is reacted with asphaltenic crude oil during matrix acidizing, it results in unexpected damage at the near wellbore region and hinder the fluid flow through certain mechanisms include:
    1- Pore... 

    Dynamic Modeling of Mud Loss in Iranian Fields Using Novel Multiphysics Methods

    , M.Sc. Thesis Sharif University of Technology Hosseini, Ala (Author) ; Shad, Saeed (Supervisor) ; Zivar, Davood (Co-Supervisor)
    The mud loss and its impact on the formation play a vital role in the productivity of the formation and the near wellbore area. Despite the importance of the use of mud during the drilling process, one cannot overlook the issues that may be caused by losing mud into the formation. In addition to the formation damage caused by mud loss, the cost associated with such phenomenon and drilling operational issues and challenges has motivated the industry to look into different avenues to resolve the mud loss issue or reduce its impact. Evaluating the impact of such a phenomenon on these issues requires accurate modeling. In this study different models have been developed to evaluate the impact of... 

    Characterization of Formation Damage Induced by Oil-Based Drilling Fluid and Proposing its Optimized Remedy

    , M.Sc. Thesis Sharif University of Technology Ahmadi, Amir (Author) ; Masihi, Mohsen (Supervisor) ; Tahmasbi, Koroush (Supervisor) ; Kalhor, Mojtaba (Co-Supervisor)
    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... 

    Reduction of fine migration in different pH and salinity conditions using nanofluid

    , Article SPE - European Formation Damage Conference, Proceedings, EFDC ; Volume 2 , 2013 , Pages 737-743 ; 9781627486101 (ISBN) Asset, Y ; Pourafshary, P ; Ayatollahi, S ; Sharif University of Technology
    Movement and transportation of fine particles in formations leads to clogging the pores and reduction in permeability. This type of formation damage is stronglycontingent upon water salinity and ionic conditions in the formation. The main parameters which control the particle release are the interactions and forces between particles and porous medium surfaces. Changing salinity which leads to pH alteration, affects these interactions and subsequently the fine migration process. Hence, pH and salinity variations should be considered to study and evaluate the portion of fine migration in formation damage. The principal challenge in this research therefore, is to try to change the surface... 

    Experimental Investigation of Water and Oil Based Colloidal Gas Aphron Drilling Fluid Performance Containing Nanoparticles in Formation Damage Reduction

    , M.Sc. Thesis Sharif University of Technology Hassani, Amir Hossein (Author) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Rashtchian, Davood (Supervisor)
    In recent years, utilizing the colloidal gas aphron (CGA) drilling fluids is getting more and more commonplace due to their little formation damage and filtration loss. This study tries to investigate the effect of presence of nanoparticles and their type (hydrophobicity) on stability and performance of water and oil based CGA drilling fluids. This is done through analyzing stability, filtration, rheology, and pore blockage tests. Water and oil based CGA drilling fluids consisted of stabilizer, surfactant, and nanoparticles are generated and through examining of the effects of polymer, surfactant, and nanoparticle concentrations, the optimum formulation is obtained. High pressure-high... 

    Multi-Objective Optimization of Drilling Operation and Formation Damage

    , M.Sc. Thesis Sharif University of Technology Azinpour, Behrouz (Author) ; Jamshidi, Saeed (Supervisor)
    Drilling operation is one of the most important parts of oil production procedure. Therefore, drilling optimization has an effective role in ultimate benefits and total cost reduction. Also formation damage can affect reservoir performance. In this study, a combination of optimization methods for each part of drilling operation has been used and fitness function of total cost is presented. This function includes number of bit runs, bit selection, controllable parameters and drilling mud properties. For prediction of formation damage radius and variable risk analysis, two new methods are proposed and have been used as fitness functions. Finally, by suggesting a multi objective optimization...