Browsing by Subject "Oil fields"
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Item Mapping fugitive sulfur emissions from Texas oil and natural gas production fields(Texas Tech University, 1995-08) Tarver, Gary A.Hydrogen sulfide and other reduced sulfur gases are released into the atmosphere during oil recovery operations; however, little is quantitatively known concerning total sulfur flux due to these fugitive emissions. A mobile atmospheric research laboratory (MARL) was constructed to furnish facile, selfcontained access to oil field sources of reduced sulfur gases. An instrument able to continuously detect pptv levels of hydrogen sulfide at near real time rates was developed and subsequently deployed on the mobile platform. Instrumentation to collect data on other gas and aerosol species along with information on meteorological conditions was also installed on the MARL. The MARL was used to collect and log quantitative data in the vicinity of various oil field operations. Atmospheric sulfur data was collected in the oil producing regions of several Texas counties including, Lubbock, Hockley, Terry, and Garza counties. The fugitive emission of hydrogen sulfide was found to be the major source of atmospheric sulfur, and a strong diurnal pattern was observed in the ambient hydrogen sulfide concentration. Work was done in the named regions to classify hydrogen sulfide in terms of source, quantity, and fate. Crude oil storage tanks and natural gas processing plants were found to be the major sources of sulfur gas emissions. Estimations of the atmospheric flux of hydrogen sulfide based upon the atmospheric concentrations recorded indicate that fugitive emissions of sulfur into the atmosphere are 10 to 30 times higher than that reported by the oil field operators to the Texas Railroad Commission. To elucidate the local fate of the fugitive emissions, soil sulfate levels in the proximity of crude oil storage tanks were determined. Soil sulfate levels upwind from crude oil tank farms were discovered to be 20 to 200 times higher than in non-oil producing regions, and the soil sulfate levels directly downwind from storage tank vents were observed to exceed the upwind levels by a factor of > 100.Item Mathematical model of the central battery for a major oil producing field(Texas Tech University, 1976-05) Skinner, David RandellNot available.Item Phase behavior of carbon dioxide sequestration in depleted gas reservoirs(Texas Tech University, 2003-08) Sobers, Lorraine ECarbon dioxide sequestration in depleted and abandoned gas reservoirs can accomplish two important objectives. Firstly, it could be important part of present climate control initiatives to reduce the concentration of carbon dioxide in the atmosphere. Secondly, it could be instrumental to enhanced gas and condensate recovery. Using the pressure-temperature diagrams and two phase flash calculations, the phase behavior of natural gas-carbon dioxide mixtures were analyzed to provide enlightenment on the carbon sequestration process. From the analysis of simulated results, it was found that carbon dioxide exhibited a drying effect on wet and retrograde gas mixtures and a wetting effect on dry gas. The results for retrograde gas condensate depended on the composition of reservoir fluids at abandonment conditions. The main difference being the liquid volume percent with increasing pressure and carbon dioxide concentration. This influenced the volume of condensate vaporized with the addition of carbon dioxide. It was also determined that carbon dioxide lowers the compressibility factor of all gas types. These results are favorable for carbon dioxide sequestration because decreasing compressibility factors represents increasing storage capacity.Item Principles of evaluation of telemetry systems for oilfield applications.(Texas Tech University, 1974-12) Loyd, George RichardNot available