摘要
准确预测气井积液时间并及时采取排水采气工艺措施,对于维持低产气井稳定生产至关重要。为此,基于对国内外气井积液预测方法及积液气井数值模拟方法的广泛调研和总结,综合分析了目前解释气井积液的液滴反转模型、液膜反转模型和气井稳定性分析方法,阐述了积液气井瞬态数值模拟的研究进展。研究结果表明:(1)不同积液预测模型计算值之间及不同类型气藏气井携液临界气量之间存在着巨大的偏差,引起气井积液的机理不仅仅由单一液体反转现象造成,而是地层与井筒共同作用的结果 ;(2)液体反转理论在解释气井出现动液面上有悖于气液两相管流的基本规律,气井动液面的产生与气井受到瞬态扰动相关。在上述研究的基础上,指出了气井积液机理研究的发展方向:结合地层数值模拟,建立合理井筒压力波动模型并将其考虑为内边界条件,开展地层—井筒耦合实验及理论研究,揭示不同类型气藏积液的控制机理并建立相应积液预测模型,以期为气井排水采气工艺设计提供理论依据和技术支撑。
In order to maintain the stable production of low-yield gas wells,it is crucial to accurately predict the onset of liquid loading and take the technical measures of drainage gas recovery in time.In this paper,domestic and foreign prediction and numerical simulation methods used for liquid loading in gas wells were extensively investigated and summarized.Then,the methods which are currently used to interpret the liquid loading in gas wells were analyzed comprehensively,including liquid-droplet reversal model,liquid-film reversal model and gas-well stability analysis method.Finally,the research progress in the transient numerical simulation of gas wells with liquid loading was illustrated.And the following research results were obtained.First,the calculation results of different liquid-loading prediction models and the critical liquid-carrying gas rates of gas wells in different gas reservoirs are greatly different.The mechanism of liquid loading in gas wells is not only caused by single liquid reversal phenomenon,but also the joint effect of formation and wellbore.Second,in interpreting the dynamic liquid level of gas well,the liquid reversal theory is contrary to the basic rule of gas-liquid two-phase pipe flow.The dynamic liquid level of gas well is related to the transient disturbance of gas well.Based on above studies,the development direction of the studies on the mechanism of liquid loading in gas wells was pointed out as follows.Establish a reasonable wellbore pressure fluctuation model on the basis of the numerical reservoir simulation,and take it as the inner boundary condition.Carry out experimental and theoretical studies on formation-wellbore coupling.Reveal the control mechanisms of liquid loading in different types of reservoirs,and establish liquid-loading prediction model correspondingly so as to provide theoretical basis and technical support for the design of drainage gas recovery of gas wells.
作者
张烈辉
罗程程
刘永辉
赵玉龙
谢春雨
张琦
艾先婷
Zhang Liehui;Luo Chengcheng;Liu Yonghui;Zhao Yulong;Xie Chunyu;Zhang Qi;Ai Xianting(State Key Laboratory for Oil & Gas Reservoir Geology and Exploitation//Southwest Petroleum University,Chengdu,Sichuan 610500,China;HSE and Technical Supervision Research Institute,PetroChina Southwest Oil & Gasfield Company,Chengdu,Sichuan 610041,China;Northeast Sichuan Division,PetroChina Southwest Oil & Gasfield Company,Dazhou,Sichuan 635000,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2019年第1期57-63,共7页
Natural Gas Industry
基金
国家自然科学基金重大项目"致密气藏储层干化
提高气体渗流能力的基础研究"(编号:51534006)
国家自然科学基金项目"基于边界元法的页岩气藏缝网多段压裂水平井不稳定渗流理论研究"(编号:51704247)
国家自然科学基金项目"耦合压裂缝网扩展机制的页岩气藏动态模拟研究"(编号:51874251)
关键词
气井积液
液滴反转模型
液膜反转模型
气井稳定性分析
地层-井筒耦合
数值模拟
实验室试验
Liquid loading of gas wells
Liquid-droplet reversal model
Liquid-film reversal model
Stability analysis on gas well
Formation-wellbore coupling
Numerical simulation
Laboratory experiment
