Petroleum Science >2012, Issue 1: 66-74 DOI: https://doi.org/10.1007/s12182-012-0184-y
Calculation analysis of sustained casing pressurein gas wells Open Access
文章信息
作者：Zhu Hongjun,Lin Yuanhua,Zeng Dezhi,Zhang Deping and Wang Feng
作者单位：
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;Jilin Field Company, PetroChina, Songyuan, Jilin 138000, China;Jilin Field Company, PetroChina, Songyuan, Jilin 138000, China;Jilin Field Company, PetroChina, Songyuan, Jilin 138000, China
投稿时间：2011-05-06
引用方式：Zhu, H., Lin, Y., Zeng, D. et al. Pet. Sci. (2012) 9: 66. https://doi.org/10.1007/s12182-012-0184-y
文章摘要
Sustained casing pressure (SCP) in gas wells brings a serious threat to worker safety and
environmental protection. According to geological conditions, wellbore structure and cement data of gas
wells in the Sichuan-Chongqing region, China, the position, time, environmental condition and the value
of SCP have been analyzed. On this basis, the shape of the pressure bleed-down plot and pressure buildup
plot were diagnosed and the mechanism of SCP has been clarified. Based on generalized annular Darcy
percolation theory and gas-liquid two-phase fluid dynamics theory, a coupled mathematical model of gas
migration in a cemented annulus with a mud column above the cement has been developed. The volume
of gas migrated in the annulus and the value of SCP changing with time in a gas well in Sichuan have
been calculated by this model. Calculation results coincided well with the actual field data, which provide
some reference for the following security evaluation and solution measures of SCP.
environmental protection. According to geological conditions, wellbore structure and cement data of gas
wells in the Sichuan-Chongqing region, China, the position, time, environmental condition and the value
of SCP have been analyzed. On this basis, the shape of the pressure bleed-down plot and pressure buildup
plot were diagnosed and the mechanism of SCP has been clarified. Based on generalized annular Darcy
percolation theory and gas-liquid two-phase fluid dynamics theory, a coupled mathematical model of gas
migration in a cemented annulus with a mud column above the cement has been developed. The volume
of gas migrated in the annulus and the value of SCP changing with time in a gas well in Sichuan have
been calculated by this model. Calculation results coincided well with the actual field data, which provide
some reference for the following security evaluation and solution measures of SCP.
关键词
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Sustained casing pressure, gas migration, coupled mathematic model, gas well