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首页> 外文期刊>International Journal of Geosciences >Risk Analysis of Gas Hydrate Formation during Deepwater Gas Well Testing
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Risk Analysis of Gas Hydrate Formation during Deepwater Gas Well Testing

机译：深水气井测试中天然气水合物形成的风险分析

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During deep-water gas wells testing period, predicting the generating zone of hydrate precisely in the whole flow range (bore holes and surface flow lines) is the key prerequisite of guarantee for testing flow. The unusual deep-water environment and low gas density make it easy to meet the conditions of hydrate generation during deep-water gas wells testing period, such as low temperature and high pressure, especially under the testing conditions, for instance, near mud line, surface chock line, low gas generating rate and surface shut-in. Wherefore, in view of all the operational modes during testing period (clean-out, variable rate flow, downhole and surface shut-in), based on temperature field of the whole flow range and phase equilibrium condition of hydrate, predicting method of hydrate generation zone is published; by taking enthalpy as the object of study, temperature calculation model increases the accuracy of temperature prediction; by integration of bore holes and surface lines, predicting plate of hydrate generation in the whole flow range is published. During flow period, the generating condition of hydrate is affected by rate of flow, and the lower the rate of flow is, the wider the hydrate generation zone is; during the stage of shut-in and initial flow, if pressure of strings is higher and temperature is lower, risk of hydrate generation will be greater and hydrate generation zone will be larger, so relevant actions should be taken to restrain hydrate generation.
机译：在深水气井测试期间，准确预测整个流量范围（钻孔和地面流线）中水合物的生成区域是保证测试流量的关键前提。异常的深水环境和低气体密度使它很容易满足深水气井测试期间水合物生成的条件，例如低温和高压，尤其是在测试条件下，例如泥线附近，表面堵塞线，低产气率和表面封闭。因此，鉴于测试期间的所有运行模式（清理，变速率流量，井下和地表封闭），基于整个流量范围的温度场和水合物的相平衡条件，预测水合物生成的方法区域已发布;温度计算模型以焓为研究对象，提高了温度预测的准确性。通过钻孔和表面线的整合，预测了整个流量范围内水合物生成的板块。在水流期间，水合物的生成条件受流速的影响，流速越低，水合物的生成区越宽。在关断初流阶段，如果管柱压力较高，温度较低，则水合物生成的风险较大，水合物生成区较大，因此应采取相应措施抑制水合物生成。

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