大牛地气田采气管线沿程温降研究

Temperature Drop Along Gas Pipelines,Daniudi Gasfield

大牛地气田采用甲醇作为水合物抑制剂,加注量以PIPESIM软件模拟为指导,而参数之一的埋地采气管线沿程温度变化规律尚未形成具体结论。针对此问题,通过分析PIPESIM软件模拟水合物生成曲线,找到了水合物生成的关键节点,利用FLUENT软件模拟了采气管线在不同环境温度下的沿程温降变化情况,结合地温监测数据进行温度校正,形成了采气管线在不同环境温度下的沿程温降模型图,并指出在不同季节条件下应采用何种对应的管线沿程温降模型。

Methanol is used as a hydrate inhibitor in Daniudi gasfield, and its filling- up quantity may be guided by a software called PIPESIM simulator. However, as one of parameters in the simulator, the temperature change along the buried gas pipelines is still unclear. So, through this simulator, the hydrate- generating curves showing the key point to generate hydrate gain. Moreover, by means of another FLUENT simulator, the temperature drop along pipelines also obtains. And temperature is calibrated on the basis of geotemperature monitoring data. Subsequently, a model figure of temperature drop along pipelines forms. These can guide how to use a temperature-drop model along pipelines under different seasons.