Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan Basin

Zhaoqian Luo, Qilin Liu, Fan Yang, Ziyuan Li, Huanhuan Wang, Bo Wang, Zhouyu Peng and Wenlong Jia ()
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Zhaoqian Luo: Northwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, China
Qilin Liu: Northwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, China
Fan Yang: Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
Ziyuan Li: Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
Huanhuan Wang: Northwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, China
Bo Wang: Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
Zhouyu Peng: Northwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, China
Wenlong Jia: Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China

Energies, 2022, vol. 15, issue 22, 1-14

Abstract: The gas reservoirs in the Northwestern Sichuan Basin have great development potential. However, their production efficiency is seriously reduced by the complex surface multistage throttling process and frequent hydrate plugging caused by the ultra-high-pressure sour gas. Considering the prevention and control of hydrates, properly designing the throttling temperature and pressure to optimize the surface production process is the key to solving this problem. First, this work presents a method for predicting the hydrate formation conditions of ultra-high-pressure sour natural gas based on the vdW-P (van der Waals–Platteeuw) model and the CPA (cubic-plus-association) equation of state (EoS) and considering the association between acid gases (H 2 S, CO 2 ) and H 2 O. Secondly, the throttling temperature prediction method was developed by coupling the isenthalpic throttling model and the modified Lee–Kesler EoS mixing rule; the maximum throttling pressure difference calculation method was constructed based on the critical flow principle. Finally, field cases are given to illustrate the distribution process of assigning the maximum throttling pressure differences. The results show that the proposed model can accurately predict the hydrate formation conditions and throttling temperature of ultra-high-pressure sour natural gas, and reveal their changing laws. The surface throttling technology of the ultra-high-pressure sour gas wells Long 004-X1 and Long 016-H1 was optimized from five-stage to three-stage, and the application of the fixed throttle valve in the field is successfully demonstrated.

Keywords: Northwestern Sichuan Basin; ultra-high-pressure; sour natural gas; throttling technology; hydrate; CPA equation of state (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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