迭代法计算油气井密闭环空压力

Calculating the pressure in sealed annulus in oil well by iterative method

邓元洲 陈平 张慧丽

Deng Yuanzhou Chen Ping Zhang Huili

油气藏地质与开发工程国家重点实验室。西南石油大学, 四川 成都 610500

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

在充分考虑压力和体积耦合变化的基础上, 建立了计算密闭环空压力的数学模型, 并简要阐述了用迭代法计算环空压力的思路。以文献1中的实例为例, 计算了环空温度变化所引起的环空压力增加值。计算表明, 同文献1的结果比较, 用迭代法计算的环空压力平均小大约10%。文章方法对高温高压井井身结构设计、套管强度设计有一定的指导作用。

Volume and pressure had coupled effect on each other, based on it the authors established mathematic model to calculate pressure in the sealed annulus by iterative method. With example in literature 1 to calculate pressure which changed due to temperature, the result indicated that the pressure in the sealed annulus based on this model was 10% less than that based on the absolutely rigidity casing model. The method could instruct well structure design and casing intensity design in HP/HT wells.