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在深水气井测试设计中,通常采用定值曳力系数悬浮液滴理论模型判断气井测试流量是否具备携液能力。由于对深水气井全井筒携液能力预测缺乏针对性的研究,上述方法设计的携液临界条件较为保守,导致结果误差偏大,实际作业中存在着积液风险,影响了深水气井现场测试的安全性。为此,通过全域拟合方法采用雷诺数修正曳力系数得到计算关联式,据此确定适合深水气井条件的较高精度天然气物性参数,最终建立了修正参数临界携液模型。基于实际案例对模型进行对比分析,证明修正参数模型能够满足深水气井测试临界携液条件设计需要,有效解决了现有悬浮液滴理论模型采用定值曳力系数对全井段进行携液预测临界值偏小等问题,提高了预测精度。结论认为,修正参数模型针对温度、压力、凝析液气比及测试管柱内径等进行敏感性分析,较为直观了解深水气井测试管柱内临界携液条件变化趋势,为优化深水气井测试安全高效参数设计提供了技术支撑。
In the deepwater well test design, the fixed-drag coefficient suspension droplet model is usually used to determine whether the gas well test flow has liquid-carrying capacity. Due to the lack of targeted research on the prediction of the carrying capacity of the whole well in deepwater gas wells, the critical conditions for carrying liquid in the above-mentioned method are relatively conservative, resulting in large errors in the results. There is a risk of liquid accumulation in actual operations, which affects the safety of on-site testing of deepwater gas wells Sex. Therefore, the global fitting method is used to calculate the correlativity by using the Reynolds number correction drag coefficient to determine the higher accuracy natural gas physical parameters suitable for the deepwater gas well conditions. Finally, a modified liquid medium criticality model is established. Based on the actual case, the model is compared and analyzed, which proves that the modified parameter model can meet the design requirements of the critical liquid-carrying conditions for deepwater gas well testing and effectively solves the problem that the traditional suspension liquid drop theory model uses the drag coefficient of fixed value to carry the liquid- Small value and other issues, improve the prediction accuracy. The conclusion is that the correction parameter model is sensitive to temperature, pressure, condensate gas-liquid ratio and inner diameter of test string. It is more intuitive to know the changing trend of critical liquid-carrying conditions in the test string of deep-water gas well. Parameter design provides technical support.