陕北气田高压气井水合物堵塞预测模拟

SIMULATION OF HYDRATE PLUGGING IN HIGH PRESSURE GAS WELLS OF SHANBEI GAS FIELD

中国长庆油田陕北高压气井在试采过程中 ,均不同程度地存在油管出现水合物堵塞现象 ,严重影响了气井的正常生产。水合物形成的初始位置对于防冻剂的注入位置、数量及方式都是极其重要的。运用流体力学、传热学等有关理论 ,同时结合vanderWaals -Platteeuw理想固体溶液假设 ,提出了一个数学模型对水合物在井筒中的堵塞初始位置进行了预测。通过现场检验 ,该数学模型具有较高的精度 ,并且计算方法简单 ,使用方便 ,能够满足工程要求。

During production testing of Shanbei high pressure gas wells, the tubing is often plugged by gas hydrate, which influences the normal operation of the gas wells seriously. Identifying the location where the hydrate first forms is very important for the inhibitor injecting position, volume, and way. With the relative theories of hydrodynamics and diathermancy, combining van der Waals―Platteeuw assume of ideal solid solution, a mathematical model is developed to predict the beginning location where the hydrate plugs the tubing. The field testing shows that the model has the characteristics of high accuracy, simple calculating, and convenient applying. The model can meet the engineering requirements.