中文摘要：

在煤气的井的持续 casing 压力(SCP ) 把严肃的威胁带到工人安全和环境保护。根据地质的条件，在四川重庆区域，中国，位置，时间，环境条件和 SCP 的值的煤气的井的 wellbore 结构和水泥数据被分析了。在这个基础上，压力流血下面阴谋和压力积聚阴谋的形状被诊断， SCP 的机制被澄清了。基于概括环形的 Darcy 过滤理论和煤气液体的二阶段的液体动力学理论， a coupled 在有在水泥上面的泥列的一个 cemented 体环的煤气的移植的数学模型被开发了。在体环和在四川在气体随着时间变化很好的 SCP 的价值移植的气体的体积被这个模型计算了。计算结果与实际的域数据与一致很好，它为下列安全评估和 SCP 的解决方案措施提供一些引用。

英文摘要：

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.