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为了抑制深水天然气井生产测试时生成水合物,针对深水环境海底高压低温特性,研究水合物生成与井筒压力、温度分布和含液量的关系,通过井筒分段方式建立井筒温度分布预测模型,考虑冷凝水和凝析油的影响,建立含液天然气井井筒压力分布模型。实例计算表明,低产气量、低井口压力状态生产测试时和开关井过程中,靠近海床的井筒及以上部分温度下降显著,有利于水合物生成。理论计算和实测值吻合较好,说明建立的模型和理论计算结果能很好地指导实际生产。
In order to restrain the formation of hydrate during the production test of deepwater natural gas wells, the relation between hydrate formation and wellbore pressure, temperature distribution and liquid content is studied in the light of the seabed high pressure and low temperature characteristics in deepwater environment. The wellbore temperature distribution prediction model Condensate and condensate oil, the establishment of wellbore pressure distribution model containing liquid natural gas well. The calculation results show that during the production test with low gas production rate and low wellhead pressure and during well opening and closing process, the temperature drop near the wellbore and above the seabed obviously decreases, which is favorable for hydrate formation. The theoretical calculation is in good agreement with the measured value, which shows that the established model and the theoretical calculation can well guide the actual production.