Chemical Engineering Commons^™

Degradation And Hydrate Phase Equilibria Measurement Methods Of Monoethylene Glycol, Khalid Alef, Stefan Iglauer, Ahmed Barifcani

Research outputs 2014 to 2021

Monoethylene glycol (MEG), a common chemical used for the inhibition of gas hydrate formation may undergo degradation in the regeneration/reclamation process. Limited research exists on the effect of degradation of MEG on hydrate formation, production facilities and equipment especially in the presence of other chemical additives. The proposed method allows for streamlining the process of preparing, degrading and analysis of MEG solutions for hydrate testing and degradation products.

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Procedure to prepare accurate MEG solutions avoiding oxidative degradation of MEG (i.e., controlling oxygen ingress).

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Two methods are suggested to mimic field-like degradation of MEG solutions (i.e., degradation by reclamation …

Investigating The Use Of Class C Flyash-Based Geopolymer Cement As A Potential Alternative To Portland Cement To Seal Co₂ Storage Wells, Priyesh Parimal Jani

Masters Theses

"Capturing emitted carbon dioxide from the source of emission and storing it underground is one effective way to reduce the amount of CO₂ in the atmosphere and is called carbon capture and storage (CCS). For the successful CCS project, it is necessary to ensure long term storage of injected CO₂ inside these selected reservoirs. Portland cement used to cast wells in these reservoirs degrade in CO₂ environment and can create migration path for leakage of CO₂. The aim of this study was to provide a comprehensive review about the problem, to propose a new geopolymer …

Computational Fluid Dynamics Modeling Of Proppant Static Settling Velocity In High Viscosity Friction Reducers, Chen Yuan

Masters Theses

"In the current petroleum fracturing industry, it is necessary to understand the downhole migration and settling velocity of the proppant. If we can master this information well, it will be a great help to obtain effective propped fracture conductivity. In order to study the transport of proppants in the well, we used laboratory experiments and computer numerical simulations to compare the results to get a meaningful conclusion. We spent a lot of time building models on a powerful computer and comparing the experimental conclusions. We finally decided to use computational fluid dynamics (CFD) as the simulation platform, discrete phase method …

Gel Composition And Brine Concentration Effect On Hydrogel Dehydration Subjected To Uniaxial Compression, Xinrui Zhao

Masters Theses

"Gel treatment is a process that injects the gel into a reservoir to control the conformance and improve the sweep efficiency of injection fluids. At a certain pressure gradient, the gel dehydrates in a reservoir due to mechanical forces. This work evaluates the effects of the gel composition and brine concentration on gel dehydration under uniaxial compression. A sodium acrylate-co-acrylamide based gel cross-linked with N, N'-Methylenebisacrylamide (MBAA) was used for the study. The compression test is performed with a rheometer with a plate-plate geometry. The gel dehydration under pressure was measured to see how gel dehydration would be impacted by …

Breaker Evaluation And Formation Damage Remediation Of Re-Crosslinkable Preformed Particle Gel (Rppg), Enze Zhou

Masters Theses

"Re-crosslinkable preformed particle gel (RPPG) is a newly developed preformed particle gel for improving sweep efficiency and oil recovery by blocking or reducing the conductivity of fractures and fracture-like channels or conduits. However, RPPG has the potential to plug the facilities or damage the formation if a treatment is not properly conducted.

This work presents the performance of selected oxidizing breakers on the degradation of RPPG. The influence of a few factors on the degradation process was investigated, including breaker type, breaker concentration, temperature, gel concentration, gel aging time, and gel size. Results indicate that breaker type, concentration, and temperature …

Review And Data Analysis Of Low Salinity Water Effect Through Induced Fine Migration, Dawei Xu

Masters Theses

"Low salinity water flooding (LSWF) is well proved to be an effective EOR technology both in laboratory and field tests, however, the conditions for LSWF to work and EOR mechanism is still debatable. Up till now, many mechanisms have been proposed to explain the incremental oil recovery in sandstone by LSWF, for instance, fine migration, ionic exchange, wettability alteration and pH increase.

In this study, we only focus on low salinity water flooding effect through induced fine migration mechanism. The objective of this study is to conduct a comprehensive analysis using statistical analysis methods and explaining the mechanism of fine …

การขจัดพอลิไซคลิกแอโรแมติกไฮโดรคาร์บอนในน้ำมันไพโรไลซิสจากยางรถยนต์เหลือทิ้ง, สุรีกาญจน์ กิ่งพุทธพงษ์

Chulalongkorn University Theses and Dissertations (Chula ETD)

น้ำมันที่ได้จากการไพโรไลซิสยางรถยนต์เหลือทิ้ง (waste tire pyrolysis oil, WTPO) ประกอบไปด้วยสารประกอบพอลิไซคลิกแอโรมาติกส์ไฮโดรคาร์บอน (polycyclic aromatic hydrocarbon, PAHs) ประมาณ 10% โดยน้ำหนักเมื่อเทียบกับปริมาณ WTPO โดย PAHs ที่พบมากที่สุด คือ แนฟทาลีน ซึ่งมีความเป็นพิษต่อมนุษย์และสิ่งแวดล้อม นี่จึงเป็นข้อจำกัดที่ทำให้ไม่สามารถนำ WTPO ไปใช้ในเครื่องยนต์ได้ ในงานวิจัยนี้จึงศึกษาการกำจัดแนฟทาลีนซึ่งเป็นแบบจำลองของ PAHs ผ่านกระบวนการไฮโดรจิเนชัน โดยใช้ตัวเร่งปฏิกิริยานิกเกิลบนตัวรองรับแกมมาอะลูมินา (Ni/γ-Al2O3) ที่มีและไม่มีตัวสนับสนุนโมลิบดินัม (Mo) ทังเสตน (W) หรือ แพลตินัม (Pt) สำหรับภาวะที่ศึกษาในการไฮโดรจิเนชัน ได้แก่ ความดันแก๊สไฮโดรเจนเริ่มต้น (10-40 บาร์) อุณหภูมิ (250-400 องศาเซลเซียส) และระยะเวลาในการทำปฏิกิริยา (2-8 ชม.) ก่อนทำปฏิกิริยาตัวเร่งปฏิกิริยาถูกรีดักชัน (reduction) แบบอิน-ซิทู (in-situ) ที่ความดันแก๊สไฮโดรเจนเริ่มต้น 30 บาร์ อุณหภูมิ 400 องศาเซลเซียส เป็นเวลา 2 ชม. ในกรณีที่ไม่มีตัวสนับสนุน Ni ปริมาณ 1-30% โดยน้ำหนักเมื่อเทียบกับตัวรองรับถูกเตรียมลงบน γ-Al2O3 ที่ถูกเตรียมด้วยวิธีไฮโดรเทอร์มัล และค่าการเปลี่ยนแปลงแนฟทาลีนถูกวิเคราะห์ด้วยแก๊สโครมาโทกราฟี ตัวตรวจวัดชนิดเฟลมไอออไนเซชัน (GC-FID) พบว่าเมื่อใช้ตัวเร่งปฏิกิริยาที่มีปริมาณ Ni 20% โดยน้ำหนักเมื่อเทียบกับตัวรองรับให้ค่าการเปลี่ยนแปลงแนฟทาลีนสูงสุดที่ 29.5% โดยภาวะที่ใช้ คือความดันไฮโดรเจนเริ่มต้น 30 บาร์ อุณหภูมิ 350 องศาเซลเซียส นาน 4 ชั่วโมง ในกรณีมีตัวสนับสนุน ตัวเร่งปฏิกิริยา NiMo NiW และ NiPt ให้ค่าการเปลี่ยนแปลงแนฟทาลีนสูงสุดที่ 44.7 46.4 และ 55.8% เมื่ออัตราส่วนเชิงอะตอมของตัวสนับสนุนเป็น 0.27 0.05 และ …

Geomechanical Modeling Of Salt Cavern Stability For Carbon Dioxide Storage In The Maha Arakham Formation, Northeastern Thailand, Narumas Pajonpai

Chulalongkorn University Theses and Dissertations (Chula ETD)

In Thailand, CO2 emissions quadrupled over the past three decades since 1989, with the power generation sector as the main contributor by burning fossil fuels to produce electricity. Therefore, the power generating industry has come under scrutiny and been pressed by society to take responsibility. Carbon Capture and Storage (CCS) is one of the many methods to deal with CO2 emissions. Generally, CO2 is captured and stored in geological formations, e.g. rock salt deposits. Salt caverns have been intensively studied regarding their usage for CO2 storage because of their favourable characteristics. In this research, the Finite Element Method (FEM, ANSYS …

The Mixed Integer Non-Linear Programming For Combined Heat And Mass Exchanger Network Synthesis With The Effect Of Emcd And Emat On Economic Analysis, Eleonora Amelia

Chulalongkorn University Theses and Dissertations (Chula ETD)

The Combined Heat and Mass Exchanger Network Synthesis (CHAMENS) which comprised a win-win strategy simultaneously diminishing the emission alongside maximizing the profits of the whole systems has been accomplished in this work. The novelty comes from the development of the original stage-wise superstructure (SWS) to be able to overcome the problems including detailed cost considerations by using more accurate formularies to determine the exchanger configurations, initializations, favorable boundaries to solve the complexities, eradicate the number of the heat and mass exchangers, and decrease the TAC. The purpose of this work is generate the new applicable method which is noticeable and …

A Critical Review Of Using High Viscosity Friction Reducers As Fracturing Fluids For Hydraulic Fracturing Applications, Mohammed Ba Geri, Abdulmohsin Imqam, Ralph E. Flori

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The primary purpose of using traditional friction reducers in stimulation treatments is to overcome the tubular drag while pumping at high flow rates. Hydraulic fracturing is the main technology used to produce hydrocarbon from extremely low permeability rock. Even though slickwater (water fracturing with few chemical additives) used to be one of the most common fracturing fluids, several concerns are still associated with its use, including usage of freshwater, high-cost operation, and environmental issues. Therefore, current practice in hydraulic fracturing is to use alternative fluid systems that are cost effective and have less environmental impact, such as fluids which utilize …

Confirmation Of Data-Driven Reservoir Modeling Using Numerical Reservoir Simulation, Al Hasan Mohamed Al Haifi

Graduate Theses, Dissertations, and Problem Reports (ETD)

Data driven reservoir modeling, also known as Top-Down Model (TDM), is an alternative to the traditional numerical reservoir simulation technique. Data driven reservoir modeling is a new technology that uses artificial intelligence and machine learning to build full-field reservoir models using field measurements (data - facts) instead of mathematical formulations that represent our current understanding of the physics of the fluid flow through porous media. TDM combines all field measurements into a comprehensive reservoir model to predict the production from each well in a field with multiple wells.

There are many opinions, speculations and criticism about not using the physics-based …

Pre-Feasibility Study Of Improving Quality Of Low-Grade Fluorite. A Case Study At Phanomthuan Deposit, Kanchanaburi, Thailand, Keosaychai Souvannavong

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this study was presented the pre-feasibility study of improving quality of low-grade fluorite from Phanomthuan deposit, Kanchanaburi province, Thailand. The purpose of this study aims to explore the optimal condition in order to remove the impurities which contained high SiO2, CaCO3 and other minerals, also evaluate the project in term of economic. Therefore, the improvement quality of fluorite by using froth flotation techniques was reach the ceramic grade. The raw material characterization contains CaF2 = 29.4 Wt.%, SiO2 = 43.9 Wt.% and CaCO3 = 6.9 Wt.%. After flotation process the optimal condition result which contains CaF2 = 96.46 Wt.%, …

Void Fraction Measurements In Large (0.3 M) Diameter Bubble Column Using Wire Mesh Sensor And Pressure Transducers- Effect Of Sparger, Afolabi Gabriel Ojo

Dissertations and Theses

The importance of the accurate temporal and spatial measurements of the two-phase flow parameters in bubble columns is very well known. The aim of this research work is to report the spatial measurements of the void fraction distribution in a 30 cm diameter cylindrical bubble column using Wire Mesh Sensor (WMS) tomography and Pressure Transducers. Pair of WMS sensors, with a 64×64 wire configuration of each sensor, were installed which are separated by a distance along the axis of the bubble column. Wire Mesh Sensors and PTs Data were collected for time-averaged and transient with a sampling frequency of 1000 …

Void Fraction Measurements In A Large (0.3 M) Diameter Bubble Column Using Wire Mesh Sensors And Pressure Transducers: Effect Of Spargers, Afolabi G. Ojo

Dissertations and Theses

The importance of the accurate temporal and spatial measurements of the two-phase flow parameters in bubble columns is very well known. The aim of this research work is to report the spatial measurements of the void fraction distribution in a 30 cm diameter cylindrical bubble column using Wire Mesh Sensor (WMS) tomography and Pressure Transducers. Pair of WMS sensors, with a 64×64 wire configuration of each sensor, were installed which are separated by a distance along the axis of the bubble column. Wire Mesh Sensors and PTs Data were collected for time-averaged and transient with a sampling frequency of 1000 …

Gas Hold-Up Measurements In 0.3 M Diameter Bubble Column: Effect Of Electrolytes, Heber Blanco De Brand

Dissertations and Theses

The present work reports the axial, radial and temporal gas hold-up profiles in a 0.3 m diameter batch bubble column using a pair of Wire Mesh Sensors and six pressure transducers.

Asphaltene Stability In Crude Oil During Carbon Dioxide Injection And Its Impact On Oil Recovery: A Review, Data Analysis, And Experimental Study, Sherif M. Fakher

Masters Theses

"Crude oils are usually associated with many compounds, some of which are favorable and others, which are not. One of the most unfavorable components of crude oil that pose severe operational problems and decreases oil production significantly are asphaltenes. These compounds are solids that are homogenized in the crude oil at room temperature but tend to separate from solution when agitated. They can deposit in the reservoir pores, wellbore, and transportation pipelines thus causing severe operational problems and oil recovery reduction.

Even though researchers have been studying asphaltenes for more than 100 years, there is still an ambiguity concerning asphaltene …

Investigate The Rheological Behavior Of High Viscosity Friction Reducer Fracture Fluid And Its Impact On Proppant Static Settling Velocity, Mohammed Ba Geri, Abdulmohsin Imqam, Andrey Bogdan, Lingjuan Shen

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The recent and rapid success of using high viscosity friction reducers (HVFRs) in hydraulic fracturing treatments is due to several advantages over other fracture fluids (e.g. linear gel), which include better proppant carrying capability, induce more complex fracture system network with higher fracture length, and overall lower costs due to fewer chemicals and less equipment on location. However, some concerns remain, like how HVFRs rheological properties can have impact on proppant transport into fractures. The objective of this study is to provide a comprehensive understanding of the influence the rheological characterization of HVFRs have on proppant static settling velocity within …

Impact Of Natural Fracture Induced Elastic Anisotropy On Completion And Hydraulic Fracturing Designs, Emre Can Dundar

Graduate Theses, Dissertations, and Problem Reports (ETD)

Shale has been usually recognized as a transverse isotropic (TI) medium in conventional geomechanical log interpretation due to its laminated nature. However, when natural fractures (NFs) exist in the rock body, additional elastic anisotropy can be introduced, converting Shale to an orthorhombic (OB) medium. Previous study illustrates that treating the naturally fractured shale rock as a TI medium by ignoring the NF-induced anisotropy can cause the erroneous estimation of the geomechanical properties (i.e. Young’s modulus, Poisson’s ratio, brittleness index, and etc.) and in-situ stress. In this paper, the study is extended to quantify the impact of NF-induced elastic anisotropy on …

Modeling Overpressure Development During Shale Rock Compaction Coupling Poroelasticity And Permeability Evolution Above 3km Depth, Wenyu Zhao

Masters Theses

"The evolution of pore pressure including overpressure during sedimentation is an important process to consider when analyzing whether high pore pressure causes rock failure. High pore pressure is caused by under-compaction due to the rapid burial of low-permeability sediments, and as a result, porosity decreases less rapidly with depth than in normally compacted sediments where porosity decreases exponentially with depth. While under-compaction related pore pressure magnitudes have been determined empirically, in most numerical modeling approaches, the pore pressure is either applied as a static magnitude or coupled to a fluid flow simulator. This study simulates the pore pressure evolution during …

New Correlation For Calculating Acentric Factor Of Petroleum 2 Fractions, Samir Khaled

Petroleum Engineering and Gas

A proper description of the physical properties of the petroleum fractions in hydrocarbon mixtures is 12 essential in performing reliable phase behavior calculations and compositional modeling studies. This 13 paper presents a comparison study among five different correlations used to calculate the acentric 14 factor of undefined petroleum fractions. A new correlation was developed for calculating the acentric 15 factor of undefined petroleum fractions, a function of no carbon atoms with an average error of 0.099 16 and a correlation coefficient of 0.998.

กัมมันตภาพและเสถียรภาพของ Ptiro2 รองรับด้วยท่อนาโนคาร์บอนที่หุ้มพอลิแอนิลีนสำหรับเซลล์เชื้อเพลิงพีอีเอ็มแบบผันกลับได้, ลดาวรรณ์ ธูปชัย

Chulalongkorn University Theses and Dissertations (Chula ETD)

งานวิจัยนี้เป็นการศึกษาผลของตัวรองรับต่อกัมมันตภาพและเสถียรภาพของตัวเร่งปฏิกิริยาแพลทินัมอิริเดียมออกไซด์ในเซลล์เชื้อเพลิงพีอีเอ็มแบบผันกลับได้ ตัวรองรับที่ใช้ในการทดสอบ ได้แก่ คาร์บอนวัลแคน (C) ท่อนาโนคาร์บอน (CNTs) และท่อนาโนคาร์บอนที่หุ้มพอลิแอนิลีน (CNTs-PANI) พบว่าตัวเร่งปฏิกิริยา PtIrO2/CNTs-PANI มีกัมมันตภาพในการเร่งปฏิกิริยามากที่สุดทั้งในปฏิกิริยารีดักชันของออกซิเจนและปฏิกิริยาการเกิดออกซิเจน โดยความหนาแน่นเชิงจลนพลศาสตร์สำหรับปฏิกิริยารีดักชันของออกซิเจน ที่ 0.6 โวลต์เทียบกับศักย์ไฟฟ้ามาตรฐานคาโลเมล เท่ากับ 1.24 มิลลิแอมแปร์ต่อตารางเซนติเมตร และปฏิกิริยาการเกิดออกซิเจน ที่ 1.55 โวลต์เทียบกับศักย์ไฟฟ้ามาตรฐานคาโลเมล เท่ากับ 41.36 มิลลิแอมแปร์ต่อตารางเซนติเมตร หลังผ่านการทดสอบเสถียรภาพในสารละลายกรดซัลฟิวริก จำนวน 1000 รอบ พบว่าตัวเร่งปฏิกิริยา PtIrO2/CNTs-PANI มีการลดลงของความหนาแน่นกระแสไฟฟ้าและอัตราการลดลงของพื้นที่ผิวในการเกิดปฏิกิริยาน้อยที่สุด ทั้งในปฏิกิริยารีดักชันของออกซิเจนและปฏิกิริยาการเกิดออกซิเจน เนื่องจากพอลิแอนิลีนที่เติมลงไปช่วยในการยึดเกาะระหว่างตัวเร่งปฏิกิริยาและตัวรองรับ ทำให้ตัวเร่งปฏิกิริยากระจายตัวได้ดีและมีเสถียรภาพ จากผลการทดลองข้างต้น พบว่าตัวเร่งปฏิกิริยา PtIrO2/CNTs-PANI เหมาะสมสำหรับการเร่งปฏิกิริยาทั้งในปฏิกิริยารีดักชันของออกซิเจนและปฏิกิริยาการเกิดออกซิเจน เพื่อใช้เป็นตัวเร่งปฏิกิริยาแบบสองหน้าที่สำหรับเซล์เชื้อเพลิงพีอีเอ็มแบบผันกลับได้

Plugging Performance Of Preformed Particle Gels In Fractures And Its Influencing Factors, Ze Wang

Doctoral Dissertations

"Preformed particle gels (PPG) has been successfully applied to combat the water channeling caused by fractures or fracture-like channels. Understanding the placement and plugging of PPG in fractures is crucial for gel treatment design. The objective of the dissertation is to explore the plugging performance of three PPG products in two types of fracture models, the partially and fully open fractures. The following studies has been conducted and conclusions have been drawn based on the results and analysis. First, the placement and plugging performance of conventional PPG was investigated using core flooding experiments conducted partially open fractures. The plugging efficiency …

Correlation Development Of Wax Deposition Prediction From Fang Oil Field, Aung Thwin Thu Aye

Chulalongkorn University Theses and Dissertations (Chula ETD)

In petroleum industry, wax deposition is a critical operational challenge. It occurs in various locations in the petroleum production chain including well tubing. Hexane, chemical inhibitor, is used to prevent the wax problem of oil from Fang oilfield by the measurement of pour point, wax appearance temperature (WAT) and wax deposition. An increasing shear rate can reduce WAT and the deposited amount increases with lowering the temperature in Fang crude oil. Moreover, the non-linear regression analysis of Fang crude oil with and without hexane in different conditions are done for all three tests. Those regression analysis equations can predict WAT …

Ore Reserve Estimation By Using A Geostatistical Tool At Heinda Mine,Tanintharyi Region,Union Of Myanmar, Aye Min Tun -

Chulalongkorn University Theses and Dissertations (Chula ETD)

Heinda mine is one of major tin producers in Myanmar. The mine has been operated for over 100 years. The mine falls at Latitude 14° 8’ N and Longitude 98° 27’ E, approximately about 45 kilometers to the east of Dawei. The ore reserve is the principal factor of mining venture. The aim of this study is to improve the ore reserve estimation by using geostatistical method (ordinary kriging) compared with conventional method (polygonal method) In geostatistical evaluation, it involved variogram analysis, variogram modelling and kriging estimation. The exponential variogram modelling was used to calculate the ordinary kriging estimation. The …

Pre-Feasibility Study On Granite Quarry For Aggregate: A Case Study At Kanchanaburi Province, Thailand, Bee Ziyivang

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aims to develop long term mine planning and design, equipment requirement calculation, and financial model analysis of mining and crushing plant. The ore reserve estimation and pit design carried out by using MineSight software (Ver. 9.50). A discounted cash flow model (DCF) and sensitivity analysis used to evaluate the financial project. Based on our study, the open-pit mining method was advisable for mine planning and design. Ore reserve estimated to 48.4 Mtons under the mining operation of 2.4 Mtos per year. The project time frame is 22 years which spends 21 years for operation and one year for …

Effectiveness Evaluation Of Fluorescent Tracer In Shaly-Sandstone Reservoir, Harid Pataveepaisit

Chulalongkorn University Theses and Dissertations (Chula ETD)

In petroleum exploration and production industry, tracer is a compound added to injected fluids, and can be easily detected even in a trace amount. Fluorescein sodium, a chemical tracer that can illuminate upon receiving a specific wavelength of light, was mentioned by several literatures due to its strong fluorescence at low concentration, non-toxicity, and non-biodegradability. In this study, fluorescein sodium in the form of fluorescein solution was evaluated with shaly-sandstone to observe their interactions. The first half of this study focused on the evaluation of the chemical characteristics of fluorescein. First, the detection limit of fluorescein solution in deionized water …

The Production Of Bio-Jet Fuel From Palm Fatty Acid Distiliate Over Covalt And Nickel Supported Hzsm-12 Catalysts, Ariya Eka Alel

Chulalongkorn University Theses and Dissertations (Chula ETD)

Aviation sector becomes one of the largest-developing public transportation nowadays, the number of air passangers always increases year by year. However, this number are proportionally related to the enhance of jet-fuel worldwide demand. The conventional jet-fuel are commonly known as a carbon dioxde emission source and the world has more concern to this pollutant due to its contribution to the climate change. The usage of renewable materials to produce jet fuel is more glanced. One of the renewable sources can be used to generate green jet fuel is palm fatty acid distillate (PFAD) which is a by-product of palm oil …

Natural Gas Storage Using Clathrate Technology : Enhanced Formation At High Temperature, Kan Jeenmuang

Chulalongkorn University Theses and Dissertations (Chula ETD)

Solidified natural gas (SNG) by storing natural gas in the hydrate form, which is safe and easy to recover stored gas compared to other methods. However, to make this technology competitive, storing natural gas at a higher temperature, lower pressure with faster formation is needed. Tetrahydrofuran (THF) is a well-known thermodynamic promoter used to increase the hydrate formation temperature. However, increasing the hydrate formation temperature has a drawback on decreasing the formation rate. Nonpolar amino acids have been used as a secondary promoter, which increases the hydrate formation kinetics. This work used 5.56 mol% THF cooperated with different concentrations of …

Stochastic Supply Chain Optimization For Ammonia And Urea Processes, Seangplang Srisamut

Chulalongkorn University Theses and Dissertations (Chula ETD)

To support the demand growth in the agriculture sector from increasing population, ammonia and urea productions have been continuously increasing. Methane from natural gas can be used as feedstock in the production process. Nevertheless, the conventional plant using natural gas feedstock produces carbon dioxide as a by-product of the process. This proposed plant contains two processes, producing ammonia and urea can be more efficient in the production, where the byproducts of CO₂ can be used to produce more urea and reduce CO₂ emission. This research proposes ammonia and urea synthesis process using PROII software to simulate workflow and estimate the …

Temperature Transient Analysis For Reservoir Characterization, Yilin Mao

LSU Doctoral Dissertations

Recent developments in downhole temperature measurements open new alternatives contributing to reservoir characterization. In this dissertation, novel forward and inverse models to analyze production- and injection-induced temperature signals are developed for conventional and unconventional reservoir applications. Important limitations of the proposed models are addressed by accounting for fluid property variations and complex production strategies.

Forward modeling approaches involve making relevant assumptions that allow rigorous analytical solutions to be constructed using Laplace transform, Method of Characteristics, and control volume analysis. Our results of the analytical models are benchmarked with those from commercial numerical simulation software. Multiple possible scenarios of conventional reservoirs …