Measurement and calculation of gas compressibility factor for condensate gas and natural gas under pressure up to 116 MPa |
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| Affiliation: | 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;2. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, China;1. Engineering Laboratory for Energy System Process Conversion & Emission Control Technology of Jiangsu Province, School of Energy & Mechanical Engineering, Nanjing Normal University, Nanjing 210000, China;2. Jiangsu Geology Geothermal Energy Co., Ltd., Nanjing 211100, China;3. School of Energy and Environment, Southeast University, Nanjing 210096, China;1. Higher Colleges of Technology, ETS, MZWC, Abu Dhabi, 58855, United Arab Emirates;2. Al al-Bayt University, Department of Physics, Faculty of Science, Al-Mafraq, Jordan;1. Institute of Electronic Systems, Warsaw University of Technology, Nowowiejska 15/19, Warsaw 00-665, Poland;2. Albert-Ludwigs-Universität-Freiburg- IMTEK, Freiburg, Germany |
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| Abstract: | The volumetric properties of two reservoir fluid samples collected from one condensate gas well and one natural gas well were measured under four groups of temperatures, respectively, with pressure up to 116 MPa. For the two samples examined, the experimental results show that the gas compressibility factor increases with the increase of pressure. But the influence of the temperature is related to the range of the experimental pressure. It approximately decreases with the increase of temperature when the pressure is larger than (45 to 50) MPa, while there is the opposite trend when the pressure is lower than (45 to 50) MPa. The dew point pressure was also determined for the condensate gas sample, which decreases with the increase of temperature. The capabilities of four empirical correlations and a thermodynamic model based on equation of state for describing gas compressibility factor of reservoir fluids under high pressure were investigated. The comparison results show that the thermodynamic model recommended is the most suitable for fluids whatever produced from high-pressure reservoirs or conventional mild-pressure reservoirs. |
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| Keywords: | Condensate gas Gas compressibility factor Dew point pressure Thermodynamics Model |
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