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Dissertation/Thesis Abstract

Visual Basic Simulation of H2S Removal from Natural Gas at Downhole in an Extraction Well
by Yasa, Santosh Reddy, M.S., University of Louisiana at Lafayette, 2017, 80; 10282466
Abstract (Summary)

Over the years, natural gas consumption has grown significant globally rendering natural gas as one of the important energy source of the future. Although the known natural gas resources are significant, more than 40% of the natural gas reservoirs are sub quality because of the presence of acid gases like carbon dioxide (CO2) and hydrogen sulfide (H2S). These impurities need to be removed from natural gas because in the presence of water, acids are formed that can corrode pipelines and other processing equipment. H2S is toxic gas and prolonged exposure to this gas can cause severe health issues and even cause death. Because of its highly toxic nature, H 2S presents greater challenge than CO2. Gas processing to remove acid gasses is referred to as natural gas sweetening. Absorption process is widely used gas sweetening technology which uses chemical solvents such as alkanolamines. However, the use of alkanolamines for the absorption process of H2S removal is a two-stage process (absorption and desorption) which involves high capital cost, demand larger energy inputs and additionally results in the generation of secondary hazardous wastes. 1,3,5-tri-(2-hydroxyethyl)-hexahydro-s-triazine has been used in this work as the H2S scavenger. Furthermore, it is economically favorable to use liquid scavengers like triazine at sites where 50 kg/day removal of H2S. The research presented in this thesis is focused on development of the Visual Basic simulation for hydrogen sulfide removal using triazine for oil and gas field applications. An algorithm developed by Smith and Missen has been utilized to develop the VB simulation. Aspen Plus property estimation simulation and Spartan molecular simulator are used in this work to simulate the thermodynamic properties of triazine and its intermediate products. Dr. Garber’s UL gas well model was utilized to simulate the gas and liquid phase composition, H2S concentration, temperature and pressure at different depths along the well. VB simulation was developed for H2S removal from natural gas at different depths using triazine as H2S scavenger. ELECNRTL property method was used for this simulation. The simulation results express the optimum depth for maximum H2S removal with minimum triazine requirement.

Indexing (document details)
Advisor: Subramaniam, Ramalingam
Commitee: Bajpai, Rakesh, Hernandez, Rafael
School: University of Louisiana at Lafayette
Department: Chemical Engineering
School Location: United States -- Louisiana
Source: MAI 57/01M(E), Masters Abstracts International
Subjects: Engineering, Chemical engineering
Keywords: Downhole, Hydrogen sulfide, Natural gas, Simulation, Visual basic
Publication Number: 10282466
ISBN: 978-0-355-52058-3
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