Interaction of coal and oil in confined pyrolysis experiments: Insight from the yield and composition of gas hydrocarbons |
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| Institution: | 1. Key Laboratory of Petroleum Resources, Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Gansu Province, Lanzhou 730000, China;2. Powerchina Water Environment Governance, Shenzhen 518102, China;3. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei 430100, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;1. University of Silesia, Faculty of Natural Sciences, 60 B?dzińska Street, 41-200 Sosnowiec, Poland;2. Oregon State University, Department of Chemistry, College of Science, Corvallis, OR 97331, USA;1. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;2. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;3. GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam 14473, Germany;4. State Key Laboratory of Heavy Oil Processing, Petroleum Molecular Engineering Center (PMEC),China University of Petroleum, Beijing 102249, China |
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| Abstract: | Isothermal pyrolysis experiments were performed for coal alone, oil alone and coal plus oil with oil/coal ratios ranging from 0.0065 to 0.1995 at 305 °C and 50 MPa for 72 h in confined systems (gold capsules). The results of these experiments reveal the interaction between coal and oil, demonstrating that oil retards the generation of gas hydrocarbons from coal cracking while coal accelerates oil cracking into gas hydrocarbons. The yields of gas hydrocarbons vary greater with oil/coal ratio in the experiments of coal B plus oil than coal A plus oil because coal A has a higher HI value than does coal B. Oil cracking rate could increase by up to 10 or even higher times in the experiments of coal plus oil compared with oil alone, deduced from the yields and chemical compositions of gas hydrocarbons. This result suggests that gas hydrocarbons, especially wet gases were largely generated from the cracking of oil or extractable bitumen in the experiments of coal plus oil with oil/coal ratio higher than 0.1. |
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| Keywords: | Gas hydrocarbon generation Confined pyrolysis Interaction of coal and oil |
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