Analyzing reservoir thermal behavior by using thermal simulation model (sector model in stars)

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2011

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Samadov, Hıdayat

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It is observed that the flowing bottom-hole temperature (FBHT) changes as a result of production, injection or shutting the well down. Variations in temperature mainly occur due to geothermal gradient, injected fluid temperature, frictional heating and the Joule-Thomson effect. The latter is the change of temperature because of expansion or compression of a fluid in a flow process involving no heat transfer or work. CMG STARS thermal simulation sector model developed in this study was used to analyze FBHT changes and understand the reasons. Twenty three main and five additional cases that were developed by using this model were simulated and relation of BHT with other parameters was investigated. Indeed the response of temperature to the change of some parameters such as bottom-hole pressure and gas-oil ratio was detected and correlation was tried to set between these elements. Observations showed that generally FBHT increases when GOR decreases and/or flowing bottom-hole pressure (FBHP) increases. This information allows estimating daily gas-oil ratios from continuously measured BHT. Results of simulation were compared with a real case and almost the same responses were seen. The increase in temperature after the start of water and gas injection or due to stopping of neighboring production wells indicated interwell communications. Additional cases were run to determine whether there are BHT changes when initial temperature was kept constant throughout the reservoir. Different iteration numbers and refined grids were used during these runs to analyze iteration errors; however no significant changes were observed due to iteration number differences and refined grids. These latter cases showed clearly that variations of temperature don’t occur only due to geothermal gradient, but also pressure and saturation changes. On the whole, BHT can be used to get data ranging from daily gas-oil ratios to interwell connection if analyzed correctly.

Subject Keywords

Oil wells

URI

http://etd.lib.metu.edu.tr/upload/12613336/index.pdf
https://hdl.handle.net/11511/20645

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

H. Samadov, “Analyzing reservoir thermal behavior by using thermal simulation model (sector model in stars),” M.S. - Master of Science, Middle East Technical University, 2011.