Riyaz Kharrat
Petroleum Research Center, Petroleum University of Technology, Tehran, I.R. IRAN
[ 1 ] - The Performance Evaluation of Viscous-Modified Surfactant Water Flooding in Heavy Oil Reservoirs at Varying Salinity of Injected Polymer-Contained Surfactant Solution
This study examines the effects of change in the concentrations of monovalent and divalent ions in the polymer-contained surfactant solution on the macroscopic behavior of viscous-modified surfactant waterflooding in heavy oil reservoirs. Salts that are used in this set of floods were sodium chloride, magnesium chloride, and calcium chloride. The results indicate that four different ranges ...
[ 2 ] - Transport Property Estimation of Non-Uniform Porous Media
In this work a glass micromodel which its grains and pores are non-uniform in size, shape and distribution is considered as porous medium. A two-dimensional random network model of micromodel with non-uniform pores has been constructed. The non-uniformity of porous model is achieved by assigning parametric distribution functions to pores throat and pores length, which was measured using ima...
[ 3 ] - Investigation of Auto Ignition Condition under Different Parameters
In this work, the potential of auto-ignition of heavy oil during in-situ combustion (ISC) process was studied. Kinetic studies were carried out using Thermo Gravimetric Analyzer (TGA), Differential Scanning Calorimetry (DSC) and Accelerating Rate Calorimetric (ARC) techniques. Effects of oxygen partial pressure, reservoir pressure and clay on auto ignition condition were investigated on a n...
[ 4 ] - Effect of Fracture Spacing on VAPEX Performance in Heavy Oil Fracture Systems
The vapor extraction (VAPEX) process, a solvent-based enhanced oil recovery process has been found promising for some heavy oil reservoirs. In this work, the VAPEX process is studied using a compositional simulator on a number of single-block and multiple block fractured systems. PVT data of one of an Iranian heavy oil reservoir are used to tune the equation of state. Effects of fracture sp...
[ 5 ] - The Effect of Temperature and Injection Rate during Water Flooding Using Carbonate Core Samples: An Experimental Approach
In many reservoirs, after water flooding, a large volume of oil is still left behind. Hot water injection is the most basic type of thermal recovery which increase recovery by improved sweep efficiency and thermal expansion of crude.In the present work, the effects of injection rate and the temperature of the injected water were surveyed by using core flooding apparatus. Water flooding was perf...
[ 6 ] - Asphaltene Deposition Modeling during Natural Depletion and Developing a New Method for Multiphase Flash Calculation
The specific objective of this paper is to develop a fully implicit compositional simulator for modeling asphaltene deposition during natural depletion. In this study, a mathematical model for asphaltene deposition modeling is presented followed by the solution approach using the fully implicit scheme. A thermodynamic model for asphaltene precipitation and the numerical methods for performing f...
[ 8 ] - Stability of Silica Nanoparticle Dispersion in Brine Solution: An Experimental Study
Nanotechnology has various applications in oil and gas industry such as enhanced oil recovery (EOR). The main challenge in using nanoparticles in EOR processes is their stability in harsh conditions such as high temperature, high pressure, and intermediate to high salinity. However, most of the recent experimental works have been performed under unrealistic conditions such as the use of distill...
[ 9 ] - Fluid Injection Optimization Using Modified Global Dynamic Harmony Search
One of the mostly used enhanced oil recovery methods is the injection of water or gas under pressure to maintain or reverse the declining pressure in a reservoir. Several parameters should be optimized in a fluid injection process. The usual optimizing methods evaluate several scenarios to find the best solution. Since it is required to run the reservoir simulator hundreds of times, the process...
[ 10 ] - Investigating the Effects of Heterogeneity, Injection Rate, and Water Influx on GAGD EOR in Naturally Fractured Reservoirs
The gas-assisted gravity drainage (GAGD) process is designed and practiced based on gravity drainage idea and uses the advantage of density difference between injected CO2 and reservoir oil. In this work, one of Iran western oilfields was selected as a case study and a sector model was simulated based on its rock and fluid properties. The pressure of CO2 gas injection was close to the MMP of th...
[ 11 ] - Challenges in Well Testing Data from Multi-layered Reservoirs and Improving Nonlinear Regression: A Gas filed case
Well test analysis of multi-layer reservoir comprises several parts. The first part concerns the estimation of parameters values and next considers finding an appropriate method to determine the unknown reservoir parameters. If the initial estimations are less accurate and weak, the final assessment may lead to incorrect results, which are totally different from the reality. Utilizing Automated...
[ 12 ] - New Analytical Approach for Reservoir Stress Approximation Based on Acid Fracturing Data
In this research attempts were made to estimate the in-situ stresses acting on a hydrocarbon reservoir based on routine activities of acid injection in oil reservoir. It was found that the relation between the re-opening pressure of fracture and principal in-situ stresses can be estimated using rock mechanics equations for the circular underground cavities. An appropriate relation between the m...
[ 13 ] - بررسی آزمایشگاهی تغییر ترشوندگی سنگ مخزن نفت با استفاده از نانوذرات سیلیکا، آلومینا و تیتانیا
در سالهای اخیر تحقیقاتی درخصوص استفاده از نانوذرات آبدوست سیلیکا (SiO2)، آلومینا (Al2O3) و تیتانیا (TiO2) به منظور تغییر ترشوندگی سنگ مخزن نفت جهت بهبود فرآیند سیلابزنی و در نتیجه افزایش میزان برداشت نفت صورت گرفته که همگی مؤید تأثیر قابل توجه این نانوذرات است؛ اما میزان تغییر ترشوندگی، ازدیاد برداشت نفت و پایداری هر یک از این مواد در قیاس با دیگری مشخص نبوده و مقایسه یکپارچه آنها ضروری به ...
[ 14 ] - مطالعه آزمایشگاهی آسیب دیدگی سنگ مخزن در اثر رسوب آسفالتین طی فرآیند تخلیه طبیعی در یکی از مخازن ایران
رسوب آسفالتین میتواند در مراحل مختلفی از تولید یا طی فرآیندهای ازدیاد برداشت تشکیل شود. مطالعات میدانی و تحقیقات آزمایشگاهی بسیاری در این زمینه انجام شده است که همه روشهای ارائه شده در جهت بهینهسازی آن بوده و هزینههای زیادی را در برداشته است. از اینرو، بررسی مکانیسمهای رسوب، بهدست آوردن پارامترهای آنها و اجرای آنالیز حساسیت تحت سناریوهای مختلف به منظور مقابله با رسوب آسفالتین لازم وضروری...
[ 15 ] - بهینه سازی عملیاتهای حفاری از طریق مدیریت ریسک حفاری و طراحی مسیر چاه
تلاش در جهت مدیریت ریسکهای حفاری میتواند دستاوردهای قابل توجهی در جهتِ به حداقل رساندن هزینهها و بهبود سرعت حفاری داشته باشد. هدف این مقاله بیان نحوه صحیح اجرای مراحل مدیریت ریسک حفاری در جهت بهینهسازی عملیات است. شناسایی، ارزیابی و اولویتبندی مراحلی هستند که منجر به تشکیل ریسک فرم جامع حفاری میشوند. در ریسک فرم جامع حفاری تمام ریسکها در کنار سازند محل وقوع، احتمال وقوع و شدّت تأثیر آنه...
[ 16 ] - مطالعه و شبیهسازی کمّی دفع و ذخیرهسازی دیاکسیدکربن در آبده مخازن نفتی
زمینه و هدف: تولید و انتشار روزافزون گازهای گلخانهای باعث تغییرات آب و هوایی و همچین گرم شدن زمین گشتهاست. در نتیجه کاهش تولید گاز دیاکسیدکربن و یا دفع آن اهمیت فراوانی دارد که یکی از روشهای رفع این مشکل تزریق دیاکسیدکربن در مخازن نفتی به منظور ازدیاد برداشت در هیدروکربن میباشد. روش بررسی: در این پژوهش، شبیهسازی دفع و ذخیرهسازی دیاکسیدکربن در آبده یک...
نویسندگان همکار
M Asef 1