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| Numerical simulation of throttling effect on throttle valve at well bottom hole |
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ZHOU Jinhui1,2, ZHANG Yun3,4, XIONG Zhiyi3,4, SHANG Jie5
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(1.MOE Key Laboratory of Petroleum Engineering in China University of Petroleum (Beijing), Beijing 102249, China;2.State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum (Beijing), Beijing 102249, China;3.College of Mechanical and Transportation Engineering in China University of Petroleum (Beijing), Beijing 102249, China;4.Beijing Key Laboratory of Process Fluid Filtration and Separation Technology in China University of Petroleum (Beijing), Beijing 102249, China;5.China Petroleum Materials Company Limited, Beijing 100029, China)
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| Abstract: |
| In the process of coalbed methane exploitation, a throttle valve was set to reduce the pressure and control the flow. However, if the temperature drops after throttling, and it is easy to form natural gas hydrate under certain conditions. To obtain the conditions when the natural gas hydrate is formed after coalbed methane throttling through throttles valve, the effects of such parameters including the throttling ratio and inlet pressure, on the throttling effect were studied by numerical simulation method. The results show that, when the inlet pressure is within the scope of 1、2、3、4、5 and 6 MPa and the throttling ratio is a constant, the pressure drop and temperature drop increase with the increase of the inlet pressure, and the Joule-Thomson coefficient decreases with the increase of the inlet pressure. When the inlet pressure is a constant, the pressure drop and temperature drop decrease with the increase of throttling ratio. When the inlet pressure is greater than 5 MPa, it is easy to form natural gas hydrate. |
| Key words: throttling effect Joule-Thomson coefficient temperature drop natural gas hydrate coalbed methane |
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