深水气井测试临界携液条件的优化设计

发布时间：2018-05-28 04:25

本文选题：深水气井 + 测试　；参考：《天然气工业》2017年09期

【摘要】：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。
[Abstract]:In the test design of deep water gas wells, the theoretical model of constant drag coefficient suspension droplet is usually used to determine whether the test flow rate of gas wells has liquid carrying capacity. Due to the lack of targeted research on the prediction of the liquid carrying capacity of the whole well bore in deep water gas wells, the critical conditions of liquid carrying designed by the above methods are relatively conservative, resulting in a large error in the results and the risk of liquid accumulation in actual operation. The safety of field test of deep water gas well is affected. For this reason, the correlation formula is obtained by using Reynolds number to modify drag coefficient, according to which the parameters of high precision physical properties of natural gas suitable for deep water gas well conditions are determined, and the critical liquid carrying model of modified parameters is established at last. Comparing and analyzing the model based on actual cases, it is proved that the modified parameter model can meet the requirement of design of critical liquid carrying condition for deep water gas well testing. It effectively solves the problem that the theoretical model of suspended droplet adopts constant drag coefficient to predict the critical value of liquid carrying in the whole well section and improves the prediction accuracy. It is concluded that the modified parameter model is sensitive to temperature, pressure, condensate liquid / gas ratio and inner diameter of test string, and the change trend of critical liquid carrying condition in test string of deep water gas well is intuitively understood. It provides technical support for optimizing the design of safe and efficient parameters for deep water gas well testing.
【作者单位】：中海油研究总院;
【基金】：国家重点基础研究发展计划(973计划)“深水油气井完井与测试优化方法”(编号:2015CB251205)
【分类号】：TE53

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