苏里格气田井下节流综合预测

传统井下节流工艺通常采用图版法、简化模型或焓熵图图解法来求解节流降温过程，这些算法都缺乏通用性和计算的连续性。为此，应用TACITE稳态模型分别结合Perkins和Fortunati节流模型对苏里格气田井下节流过程的温度、压力变化进行模拟，并采用NETOPT网络优化模型对井下节流器的内径进行预测优化，同时采用多种模型对井下节流过程进行井下节流敏感性分析、天然气水合物抑制效果预测和流体临界状态判断。模拟结果与现场实测数据比较表明：多种预测模型的综合运用可较好地对井下节流过程的压力、温度、节流器内径等节流参数进行预测模拟，为该气田井下节流工艺提供了可靠的预测手段；井下节流可较好地简化井口流程并改善井筒天然气水合物的形成条件；马赫数临界判定方法对井下节流流体临界状态的判定要比理论临界压力比判定方法更严格、准确。

An integrated forecast for downhole throttling at the Sulige gas field

Generally,the chart method,the simplified model and enthalpy entropy chart are adopted to solve the throttling and temperature dropping process in the traditional downhole throttling process.However,these methods lack commonality and continuity in calculation.Therefore,the TACITE steady-state model,combined with the Perkins and Fortunati throttling models respectively,is applied to simulate the temperature and pressure change at the Sulige gas field.Besides,the NETOPT network optimization model is used to p...