带井下节流器的低渗气井携液能力研究

发布时间：2018-07-12 21:20

本文选题：井下节流 + 通用模型　；参考：《西南石油大学》2015年硕士论文

【摘要】：近年来气井井下节流工艺技术在低渗透气田的开发中得到推广应用,对于有水气田,随着气田的不断开发,产水气井所占比例逐年增加,提前预测气井的携液能力,能够判断井底积液,对于气井生产有着重要的意义。本文对带井下节流器的低产水气井,考虑气井生产过程中的积液现象,首先采用平均参数法和Cullender-Smith法利用井口套压计算积液井井底压力；采用Hagedorn-Brown垂直管气水两相流压力计算方法计算油管内压力剖面；考虑气井井筒径向传热,计算气井油管内温度剖面。利用Perkins模型,计算流经节流嘴的压降；根据节流前后焓值相等的特点,并且基于相平衡理论,建立了节流温降计算模型。文中以垂直气井为研究对象,根据液滴质点力平衡理论,认为液滴在井筒中会发生变形,并考虑了液滴破碎时的最大尺寸,在综合对比曳力系数及计算液滴变形参数的基础上,建立了气井连续携液临界条件的通用模型。对已有的携液临界流量计算方法和通用模型进行对比分析,从机理上解释了不同的计算方法得到的结果相差较大的原因,并以苏里格气田100口实例井验证表明通用模型具有较好的普适性。对携液模型进行参数敏感性分析,并利用之前提出的井下节流气井压力场、温度场数学模型,结合气井生产数据,模拟井下节流气井温度压力场分布,并综合分析了带井下节流器的低渗气井携液能力。通过对苏里格气田实测井实例分析,通用模型能够准确预测气井积液,为后续的排水采气措施实施提供了依据。
[Abstract]:In recent years, the downhole throttling technology of gas wells has been popularized and applied in the development of low permeability gas fields. With the continuous development of the gas fields, the proportion of water-producing gas wells increases year by year, and the liquid carrying capacity of gas wells is forecasted in advance. It is of great significance for gas well production to be able to judge bottom hole fluid accumulation. In this paper, the low production gas well with downhole throttle is considered in the production process of gas well. The average parameter method and Cullender-Smith method are used to calculate the bottom hole pressure of the well. Hagedorn-Brown vertical tube pressure calculation method for gas-water two-phase flow is used to calculate the pressure profile in the tubing and the temperature profile in the tubing is calculated considering the radial heat transfer in the well bore. The pressure drop through the throttle nozzle is calculated by using Perkins model, and the calculation model of throttling temperature drop is established according to the characteristics of equal enthalpy before and after throttling and based on the theory of phase equilibrium. In this paper, the vertical gas well is taken as the research object. According to the theory of droplet particle force balance, it is considered that the droplet will deform in the wellbore, and the maximum size of the droplet breakage is considered. On the basis of comprehensive comparison of drag coefficient and calculation of droplet deformation parameters, A general model for the critical condition of continuous liquid carrying in gas wells is established. By comparing and analyzing the existing calculation method of critical flow rate of liquid carrying and the general model, the reason why the results obtained by different calculation methods differ greatly is explained from the mechanism. The results of 100 wells in Sulige gas field show that the universal model has good universality. The parameter sensitivity analysis of liquid carrying model is carried out, and the distribution of temperature and pressure field in downhole throttling gas well is simulated by using the mathematical model of pressure field and temperature field of downhole throttling gas well, and combining with the production data of gas well. The liquid carrying capacity of low permeability gas well with downhole throttle is analyzed synthetically. Through the analysis of the actual well in Sulige gas field, the general model can accurately predict the gas well fluid accumulation, which provides the basis for the subsequent implementation of the drainage and gas recovery measures.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE37

【参考文献】