英台气田井下防冻堵技术研究

发布时间：2018-03-04 10:04

本文选题：水合物　切入点：冻堵　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：英台气田2009年开始开发,前期该区气藏采气工艺多是沿用普通的气藏开发模式,在开发过程中普遍存在水合物冻堵现象,为解决冻堵问题,前期主要采用的抑制剂法中的热力学防治方法(注甲醇),其用量大、成本高、有效期短,具有毒性等,对安全、环境等影响很大,因此需要开展英台气田井下防冻堵技术研究,使气藏得以合理、高效、科学的开发利用。本研究系统评价了英台气田井下冻堵机理,研究并优选了解决办法,解决的冻堵问题。一是明确了英台气田水合物生成主控因素,英台气田天然气组分以甲烷为主,压力、温度是水合物生成的主控因素,受产水量影响较小,凝析油在不同井况下影响不同。二是应用wellflo析软件建立井筒计算模型,对井下深度-温度-压力等水合物生产的主控因素进行了预测,结果与现场情况吻合度较高,并明确了提高气量解堵方式不适合英台气井水合物解堵。三是优选JL-PVV-1新型水合物抑制剂,进行室内压力、过冷度、抑制剂浓度、凝析油影响等实验评价,同效果情况下浓度仅为甲醇和乙二醇的1/5-1/8,对水合物生产有较强抑制作用。四是建立了井下节流参数计算模型,可定量计算井口外输压力、井下节流油嘴嘴径、井下节流下入深度等参数,并在英G井上初步试验成功。本研究形成的成果在现场得到有效应用,取得较好效果,一定程度上解决了气井井下冻堵这一较为复杂和艰难的工程问题,确保了气田正常生产。
[Abstract]:In 2009, Yingtai gas field began to develop. In the early stage, gas recovery technology of gas reservoir in Yingtai gas field is based on the common gas reservoir development model. In order to solve the problem of frozen plugging, the phenomenon of hydrate freezing plugging is common in the development process of Yingtai gas field. The thermodynamics prevention and cure method of the inhibitor method used in the early stage (injecting methanol with large amount, high cost, short validity period, toxicity, etc.) has great influence on safety, environment and so on. Therefore, it is necessary to carry out research on the technology of anti-freezing and plugging in Yingtai gas field downhole. This study systematically evaluates the mechanism of freezing plugging in Yingtai gas field, studies and optimizes the solution, and solves the problem of freezing plugging. First, the main controlling factors of hydrate formation in Yingtai gas field are defined. The composition of natural gas in Yingtai gas field is dominated by methane, the pressure and temperature are the main controlling factors of hydrate formation, the influence of water production is small, and the effect of condensate oil is different under different well conditions. Secondly, the wellbore calculation model is established by using wellflo software. The main controlling factors of hydrate production, such as depth, temperature and pressure, are predicted. The results are in good agreement with the field conditions. It is determined that the method of removing gas plugging is not suitable for gas hydrate removal in Yingtai gas well. Third, JL-PVV-1 new type hydrate inhibitor is selected for indoor pressure, undercooling, inhibitor concentration, condensate effect and so on. Under the same effect, the concentration of methanol and ethylene glycol is only 1 / 5 / 1 / 8 of that of methanol and ethylene glycol, which has a strong inhibitory effect on hydrate production. Fourthly, a calculation model of downhole throttling parameters is established, which can quantitatively calculate the outlet pressure and nozzle diameter of downhole throttle nozzle. The downhole throttling depth and other parameters have been tested successfully in YingG well. The results obtained in this study have been effectively applied in the field, and good results have been obtained. To some extent, it solves the complicated and difficult engineering problem of freezing plugging in gas wells and ensures the normal production of gas fields.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE358

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