Study and Application of Phase Curve of Hydrates in Deep Water Gas Well Testing
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摘要: 针对深水气井测试过程中井筒温度场的变化带来水合物生成的巨大风险，易导致测试管柱堵塞、环空出现较大的带压值等严重问题，对水合物生成相态曲线在深水气井测试过程中的多方面应用进行了研究。首先在深水气井测试井筒温度场精确预测的基础上，结合水合物相态曲线，定量预测了测试期间管柱内水合物的生成区域，计算得出了测试管柱上的化学药剂注入阀的下入深度，并设计确定了测试期间井筒及地面油嘴处水合物抑制剂的注入量，形成了深水气井测试水合物相态曲线应用方法。该方法在南海深水某气井进行了综合应用，计算得出该井测试期间化学药剂注入阀下入深度为2 450 m，井筒及地面油嘴处水合物抑制剂注入分别为甲醇和（3%～5%）乙二醇，综合应用测试作业工作制度，测试期间井筒无水合物生成，地面油嘴处水合物生成注入抑制剂后压力下降约13.6%，保证了现场测试作业的成功实施，可为其他深水气田测试过程中天然气水合物的防治提供借鉴。Abstract: In deep water gas well testing, changes in the temperature field of the wellbore usually result in a huge risk-the formation of hydrates. The hydrate generated will cause test pipes to block, and the annular space to have high pressure. Study has been conducted on the application of the phase curve of hydrate generation in deep water gas well testing. Based on an accurate prediction of the wellbore temperature field in deep water gas well, the area inside the test string in which hydrate will be generated during well testing is quantitatively predicted using the phase curve of hydrate, the depth at which the chemical injection valve is run on the test string is calculated, and the amount of hydrate inhibitor injected in wellbore and at the surface (choke) during testing is determined. All these together form the method of using the phase curve of hydrate in deep water well testing. This method has been used on a deep water gas well in South China Sea. The depth at which the chemical injection valve was run was calculated to be 2,450 m. Two hydrate inhibitors, methanol and glycol (3%-5%), were injected into the wellbore and at the choke on the surface respectively. Well testing was done in accordance with the standard work system, no hydrate had ever occurred in the wellbore during testing. Hydrate was produced at the choke, and after injecting hydrate inhibitor, the pressure was reduced by 13.6%, ensuring the success of the well testing operations. The operation procedure can be used for reference in controlling the formation of gas hydrate during well testing in deep water gas fields.
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Key words:
- Deep water /
- Well testing /
- Phase curve of hydrate /
- Generation area /
- Injection of inhibitor
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