1,961 Works

Natural gas vehicles, an idea whose time has come

The recent events in the Persian Gulf have again heightened the realization that the United States is still as energy dependent on Mideast supplies of oil as it was eighteen years ago when the Arabs imposed their first oil embargo. Petroleum dependency is a problem of the transportation sector. Since 1958 petroleum has supplied between 95.4 percent and 97.3 percent of all transportation energy in the U.S. However, oil production in the U.S. has continued...

Impact of central city revitalization on East Austin, Austin, Texas

Sharon Greenhill
This research invites a close scrutiny of an area subject to considerable change in Austin, Texas. The study area is a segment of East Austin bordering the Central Business District, marred by substantial instability, below median income, substandard housing and overall neighborhood decline. The presence of two ethnic groups --Mexican-American and Black --in this area create interesting cultural and political diversities. The adjacent Austin CBD is on the brink of extensive "revitalization" in an effort...

The life of José María Morelos, the founder of the Mexican nation

Wilbert H. Timmons
Upon the advent of Morelos, the Mexican movement for independence passed into its second phase, and the period from the death of Hidalgo in 1811 to the death of Morelos in 1815 may be called, with full justification, the Epoch of Morelos. Not only was Morelos the greatest military commander produced by that period, but he was a statesman of a high order, who decreed far-reaching political, social, and economic reforms, and provided the revolutionary...

Numerical Simulation of Geopressured Geothermal Aquifer Phenomena

Hiroshi Ohkuma
Hot brines in geopressured sandstones contain significant quantities of dissolved natural gas. If these sandstones are capable of producing brines at high rates, the natural gas and thermal energy may be economically recovered. However, brine withdrawal will result in a large pressure reduction over an extensive reservoir volume, and it may cause pronounced land subsidence. To minimize subsidence and increase recovery, brines may be reinjected into producing reservoirs. A local volume averaging technique was employed...

A Comparison of Iterative and Direct Methods in Compositional Ano Geopressureo-Geothermal Simulators

Janet Kay Ply
The use of fluid flow simulation programs has greatly increased as high speed computers have become more available. The growing complexity of these simulators arises from handling larger and more difficult problems while maintaining reliability and efficiency. (l) Accompanying more complicated models are longer execution ti mes and greater amounts of storage. The most important factors contributing to computing time and storage are the solution and representation of a larger system of equations. This system...

A Comparison of Three Equation of State Compositional Simulators

Kent Joseph Thele
During the past two decades, approximately one formulation per year has been published for compositional simulators. However, until now, no consistent comparison has been made on any of them. Three of these formulations were implemented on the Dual Cyber 170/750 machine and compared. Formulations by Nghiem, Fong, and Aziz (NFA) and Young and Stephenson (YS) were programmed for one and two dimensional problems, and the fully implicit formulation by Coats (C) was coded for one...

Pvt Simulators for Microcomputers

Thomas Nathan Tufts
Fluid analysis or pressure-volume-temperature (PVT) analysis of petroleum fluids can be obtained by either laboratory analysis, empirical correlations, or through the use of equations of state. Laboratory analysis is notably accurate but is expensive, time-consuming, and requires specialized equipment and personnel. Empirical correlations are readily available and easy to use but can have inherent inaccuracies because conditions vary from those in which the correlations were developed. Fluid analysis by si mu la ti on technique...

The perception and interpretation of Beethoven's piano sonatas in English and American publications of the nineteenth century

Victor Gavenda
This thesis presents the results of an investigation into how Beethoven's piano sonatas were reviewed and treated in musical journals and books on theory and piano playing published in England and America during the nineteenth century. The focus is not on Beethoven's sonatas themselves, but on the effect they had, and on the ways in which they were received, analyzed, and interpreted during this period. The thesis, therefore, falls within the parameters of two new...

Dielectric Properties of Fluid Saturated Rocks

Ali Garrouch
The objective of this dissertation is to study the effect of wettability, clay content, water saturation and salinity on the electrical properties of hydrocarbon bearing rocks. The frequency range of interest is 10 Hz to 10 MHz. Measurements were made for the impedance of both fully and partially saturated rocks using the four-electrode method and for fully saturated rocks using the two-electrode method. These measurements include both clean and shaly sand samples. For fully saturated...

An Expert System to Aid in Compositional Simulation of Miscible Gas Flooding

Sameer Ali Khan
An expert system (UTINPUT) has been developed for preparing appropriate input data sets to design miscible gas floods using The University of Texas Compositional Simulator (UTCOMP). The input data values for UTCOMP must be carefully assigned to represent the petroleum reservoir with an appropriate model and to make accurate and efficient simulations. Using emerging expert system technology, this expertise has been implemented on a workstation using an expert system shell. The resulting expert system is...

Identification, Classification and Regulation of Newly Discovered Gas Condensate and Volatile Oil Reservoirs

David Bryan Voorhis
Volatile oil and gas condensate reservoirs are special reservoirs because of their potential for improved hydrocarbon liquid recovery through some form of pressure maintenance operation. These reservoirs are difficult to identify from surface production characteristics. Many times, the correct determination of the reservoir fluid type requires laboratory analysis of the reservoir fluid. Current regulations enforced by the Texas Railroad Commission do not specifically recognize volatile oil or gas condensate reservoirs. Single phase reservoirs are classified...

Modeling and Application of Tracers for Reservoir Characterization

Vichai Maroongroge
There were two main objectives of this research. The first objective was to develop an accurate and efficient tracer model to study gas tracers used in both single-well and interwell tracer tests. The second objective was to develop an advanced technique for the description of reservoir characteristics using an interwell tracer test. The first objective was achieved by implementing a tracer option in UTCOMP (an equation of state compositional simulator). The code was made efficient...

Development of Three Dimensional Streamline Model (Utstream) and Its Application

Masanori Kurihara
Tracer test results can be analyzed to characterize flow through permeable media. Usually this is carried out by history matching with numerical models. However, a conventional streamline model, using line source and sink solutions, can be applied only to two dimensional (2D) areal geometry. Use of a numerical simulator for this purpose is limited because of numerical artifacts and large calculation time. We have developed a semianalytical three dimensional (3D) streamline model (UTSTREAM) for use...

A Study of Nonaqueous Phase Liquid Characterization and Surfactant Remediation

Minquan Jin
The objectives of this research were to identify and evaluate environmentally acceptable surfactants that could be used for surfactant enhanced aquifer remediation and to develop a partitioning tracer test method for the detection, estimation, and remediation performance assessment of subsurface nonaqueous phase liquids. First, a systematic approach for selection of surfactants for the remediation of nonaqueous phase liquid contaminated subsurface was developed. The approach entails the observations of the classical Winsor type phase behavior of...

Sandstone Acidizing Simulation: Development of an Expert System

Untung Sumotarto
Various models to simulate sandstone acidizing processes in oil well stimulations have been presented in the past. The standard "lumped" model representing the sandstone acidizing process that has been used until recently considers one acid and two representative minerals. Although this model has been employed for years, investigators have found tpat the model does not account for acid (HF) consumption consistently and cannot extrapolate laboratory data to different operating conditions. A secondary dissolution/precipitation reaction is...

Optimum Design of Field-Scale Chemical Flooding Using Reservoir Simulation

Wei-Jr Wu
Chemical flooding techniques for improved oil recovery are not widely applied in large-scale projects due to the high cost of chemical and uncertainty of oil price. An optimum design was constructed with new techniques and innovations such as high-efficiency chemicals, horizontal well technique, and advantage from the chemical reactions and interactions that is necessary to improve the cost-effectiveness of chemical floodings. A series of systematic sensitivity simulations with a realistic fluids and reservoir properties was...

Least-Squares Finite Element Method For Hydrocarbon Transport In Porous Media

Deepankar Biswas
Mathematical models for the transport of constituent components of a multicomponent system in a porous medium play an important part in petroleum reservoir analysis and production. The success of such models is dependent on (1) how well the relevant physical and chemical processes controlling subsurface transport is represented by mathematical equations and their parameters and (2) how accurately and efficiently the equations are approximated with numerical methods. The existing models of multicomponent transport employ two...

Thermoreversible Gels and Temperature Triggered Kinetically Controlled Gels for Oilfield Applications

Siree Nasakul
Polymer gels have been extensively used in oil and gas wells. In this dissertation we explore the use of novel thennoreversible gels and temperature triggered kinetically controlled gels for application in water shutoff, gravel packing and fracturing. Thermoreversible gels consisting of block copolymer surfactants have the unique property of forming a gel between a certain temperature range. The range of gelation temperatures can be controlled by varying the surfactant concentration, molecular weight, hydrophobicity and functional...

Reservoir Characterization of North Buck Draw Field Based on Tracer Response and Production/Injection Analysis

Belkis Teresa Refunjol
A major goal in reservoir characterization is to develop methods to describe the spatial distribution of properties that incorporate observed heterogeneity and variability due to the geologic complexities. Among these, reservoir continuity is one of the properties that significantly affects production strategies and ultimate oil recovery. Furthermore, proper quantification of the spatial distribution of properties and associated uncertainties is important for most reservoir engineering applications. But, before applying any reservoir characterization technique, some factors have...

Role of Acid-Base Interactions in Colloid Adhesion and Stability of Aqueous Thin Films

Alexandre Mussumeci Freitas
Experiments were performed to evaluate the hydrodynamic force required to detach colloidal particles from different types of substrates by fluids in simple shear flow. The role of DL VO and acid-base interactions on the process of adhesion and removal of colloidal particles, from model surfaces, in various fluid environments was investigated. Particles and substrates with varying degrees of hydrophobicity were used. The free energy of interaction between these surfaces in a number of fluid media...

Analytical Solutions for Hydraulic Fracture Diagnosis

Thomas Wagenhofer
This work presents old and new analytical solutions for hydraulic fracture diagnosis. The main body of this work is divided in two parts: Part I presents the main developments, theories and applications of pressure transient testing as a tool for hydraulic fracture diagnosis. Pressure transient analysis is an inverse process and therefore subject to uncertainties and uniqueness problems. Although the analysis of pressure data is nowadays fully computer automated which allows for faster, more accurate...

Modeling Asphaltene Precipitation and Implementation of Group Contribution Equation of State Into Utcomp

Xiangjun Qin
The main objective of this research was to improve the accuracy of the UTCOMP simulator for predicting oil production. This work includes two parts. The first part is to simulate the asphaltene precipitation during oil recovery, and the second part is to implement group contribution equation-of-state for the phase equilibrium calculations in reservoir simulations. Asphaltene precipitation is a serious problem in oil recovery, and it may damage the oil production. Many models have been developed...

Productivity Improvement of Gas-Condensate Wells by Fracturing

Kumar Rajeev
The objective of this thesis was to study the effect of vertical fractures in improving the productivity of gas-condensate wells by conducting numerical simulations. A single-well fracture-model, that includes a hydraulic fracture, was simulated using UTCOMP compositional simulator. The results show that a vertical fracture can significantly help in recovering the loss of productivity that occurs because of the condensate dropout near the wellbore. Effect of various factors such as fracture length, fracture conductivity, formation...

Improving Waterflood Techniques in Heterogeneous Reservoirs

Rajan Kumar Prasad
Heterogeneous reservoirs undergoing waterflooding contain zones in which oil in the small-permeability zones is bypassed by water (Fogg et al., 1991; Jennings et al., 1998; Mishra, 1993; Waggoner et al., 1992; Lucia et al., 1995; Wang et al., 1998). The profitability of producing from heterogeneous reservoirs can be poor because of water breakthrough in large-permeability layers (Hari Prasad Production Co., 1994). It seems possible to improve the profitability of producing from heterogeneous reservoirs by diverting...

A Methodology to Determine the Initial Field Development Strategy for a Naturally Fractured Shale Gas Resource

Raymond Leslie Johnson
Shale reservoirs represent a large portion of the world's elastic reservoirs and a large unconventional gas resource. Naturally fractured shale reservoirs that are organic-rich, highly porous, highly gas-desorptive, and possess extremely low values of permeability are often targeted for shale-gas potential. While these reservoirs generally possess low matrix permeability values, a well-connected set of natural fractures can access the highly porous matrix, containing a high degree of total organics with good gas storage potential. Furthermore,...

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