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The Influence Factors Research of CO2 Concentration Change Within the Oil Associated Gas

Author: MaXiaoQiang
Tutor: LuYan
School: Northeast University of Petroleum
Course: Environmental Engineering
Keywords: Crude oil associated gas CO2 origin Oilfield Microbiology Ternary system Corrosion
CLC: P618.13
Type: Master's thesis
Year: 2011
Downloads: 93
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Abstract


With the increase of years of Daqing oilfield development and development of the deepening, CO2 corrosion as the oil and gas industry has been plagued by serious problems, find their rational solution becomes more urgent. Especially in the late stage of development, the concentration of CO2 recovery system also showing a rising trend. In order to effectively address a reasonable increase in CO2 concentration problems caused by the need to increase the concentration of CO2 from the source to find the cause. The research over the years associated gas in oil content of C02 changes, and through the actual track and monitor oil and gas wells to obtain some of the CO2 concentration data. By means of gas chromatography, analytical got four plants crude oil associated gas CO2 content in the variation. Data show Daqing crude oil associated gas in the variation of CO2 concentration showed a growing trend in recent years. In 2000 to 2010 data, an increase of 286%, monitor to the maximum value of 296% increase. Experiments on-site gas samples collected by means of GC analysis of the carbon isotope values ??of CO2 d13CCO2, most of the carbon isotope values ??of samples δ13CCO2 gt; 10 ‰, showing widespread emphasis on the characteristics of the reasons for this phenomenon reduction is caused by bacteria. Analytical methods combined with a variety of causes, draw crude oil associated gas in the C02 comes from thermal decomposition of carbonate rocks, that mixture of inorganic genesis. Experimental study of reservoir microbial sulfate-reducing bacteria (SRB), saprophytes (TGB), iron bacteria (FB), petroleum hydrocarbon degrading bacteria (HDB), etc. and the interaction of CO2 gas. CO2 concentration in the same circumstances, in contact with CO2 in the process, the majority of the sample concentrations FB and HDB slight increase over time (variation of magnitude of 100-101), the TGB and the SRB concentration with time increased significantly (amount of change of magnitude 102-104); CO2 concentration in the sample be slightly reduced early experiments, Late with FB, TGB, SRB and other microorganisms catabolism HDB organic, and the petroleum hydrocarbon HDB decomposition, resulting in increasing the concentration of C02 to. Experimental study of polymers, surfactants, alkali and field applications both scale inhibitor and demulsifier and one case of CO2 alone, in order to examine ASP flooding agent used mainly for CO2 concentration. The results show that the polymers, the surface active agent content of less influence of CO2 (12.8% -16.9%), an alkaline solution can reduce the content of CO2 in the gas phase, chemical demulsifier taken out of the system and inhibitor (1.5% -11.8 %) had little effect on the concentration of CO2. The effects of CO2 enrichment experiments alkali ASP system for the alkali concentration, viscosity and interfacial tension variations. With the increase in contact time with C02, the alkali concentration in the ternary system at reduced; with the increase of the alkali concentration, the viscosity of the ternary system decreased, with the increase in contact time and CO2 was gradually reduced viscosity trend. Pure CO2 has little effect on the viscosity of the system; ternary system interfacial tension with alkali concentration increases. Blank contrast, CO2 presence can reduce the interfacial tension. Experiment focuses on the analysis of the CO2 system oilfield corrosion and scaling effects. Experimental and simulated by hanging piece oil field environment, the effects of different concentrations of different CO2 produced liquid steel commonly used for oil and 20 # steel A3 steel effect. Prior to joining 100ml CO2 Flooding ternary liquid corrosion rate of 3.297 × 10-2 (mm / a), not added CO2 Flooding ternary liquid corrosion rate of 1.726 × 10-2 (mm / a) , the former is about two times the latter. 20 # steel more corrosion resistant than steel A3; three yuan produced liquid polymer flooding out over more corrosive liquid steel; CO2 gas can be exacerbated by adding steel corrosion.

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