Prediction of SCP in gas wells based on gas channeling-path characterization

Journal of Engineering Research

Zhichuan Guan¹  Xiaofeng Zhao¹  Fei Cao²  Yanxian Wu³ 

[1] College of Petroleum Engineering, China University of Petroleum (East China);Department of Petroleum and Geosystems Engineering, The University of Texas at Austin;NO.1 Gas Production Plant, Petrochina Xinjiang Oilfield Company

关键词: annular equivalent permeability;    gas channeling;    gas well;    prediction;    sustained casing pressure;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Kuwait University * Academic Publication Council

【 摘 要 】

Sustained Casing Pressure (SCP) is a critical aspect to gas well safety and environmental protection. All regulations require SCP elimination. This paper focuses on the SCP which caused by gas migration in cemented casing annulus. We modeled the gas channeling-path of cemented section and further developed a modified method to predict casing pressure rise. A field study was presented in the paper to verify the result of the prediction. We also analyzed the effects of annular permeability, initial annular pressure, gas leakage pressure and cementing isolation interval length on SCP, which suggested that, the annular equivalent permeability and initial annular pressure influence the rising rate of casing pressure without influencing the maximum; while gas leakage pressure and the length of cementing isolation interval can influence both the rising rate and the maximum, after that we discussed the prevention measures. In particular, we suggest that the rising rate and the maximum of casing pressure should be considered while determine the cementing isolation interval.

【 授权许可】

Unknown