深水气井测试水合物生成的预测及防治

发布时间：2018-01-16 19:36

  本文关键词：深水气井测试水合物生成的预测及防治　出处：《西安石油大学学报(自然科学版)》2017年06期 　论文类型：期刊论文

  更多相关文章： 深水气井 水合物 井筒温度 井筒压力 探井测试

【摘要】：深水气井测试时,海水段较长且温度较低,天然气容易在泥线至海平面之间形成水合物,堵塞井筒,导致测试失败。建立深水气井井筒温度-压力模型,模拟南海西部某深水探井测试制度,求解得到井筒流体温度、压力分布;对该区域天然气样进行水合物生成实验,得到天然气水合物生成临界条件。结合测试模拟结果,认为温度是影响水合物生成的主要因素且常规测试过程中该井会在泥线附近生成水合物。隔热油管能够降低井筒整体传热系数,提升流体温度,模拟显示采用隔热油管后流体温度整体升高30℃左右,不同产量下测试均不会生成水合物,能够保证测试顺利进行,该井实测情况也证实了这一预测。实测不同产量下井口温压数据与模拟结果对比,误差均小于5%,证明了模型的准确性,表明该方法能够为深水气井测试过程中水合物预测和防治提供依据。
[Abstract]:When testing deep water gas wells, the sea water section is longer and the temperature is lower, the natural gas is easy to form hydrate between the mud line and sea level, which leads to the failure of testing, and establishes the temperature and pressure model of the well bore of deep water gas wells. The testing system of a deep water exploration well in the western part of the South China Sea is simulated and the temperature and pressure distribution of the wellbore fluid is obtained. The critical conditions of gas hydrate formation were obtained by gas hydrate formation experiments in this region. The test results were combined with the simulation results. It is considered that temperature is the main factor affecting the formation of hydrates and during the routine testing the hydrates will be formed in the vicinity of the mud line. The heat insulation tubing can reduce the overall heat transfer coefficient of the wellbore and raise the temperature of the fluid. The simulation results show that the temperature of the fluid increases about 30 鈩，

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