疏松砂岩气田气井携液、携砂机理研究及应用

发布时间：2018-04-19 08:11

本文选题：疏松砂岩气田 + 临界携液　；参考：《西南石油大学》2017年硕士论文

【摘要】：西北某疏松砂岩气田储层为一套发育受构造控制并有少量岩性控制的地层。该储层为泥质含量高、成岩性差、物性好、非均质性较强的碎屑岩储层,岩性以泥质含量较高的粉砂岩、泥质粉砂岩和少量细砂岩为主。由于处于成岩早期阶段,普遍保持着高孔、高渗特点。该储层气田具有多气水系统,气藏为边水环绕;储层岩性疏松,胶结差。因而,在该疏松砂岩气田的开发过程中,特别是气井生产到中后期,常伴随着气井产水以及井筒积液、出砂等现象。论文针对该疏松砂岩气田生产过程中出现的气井井筒积液现象,以气井临界携液、携砂模型为研究手段,分析并对比了前人的携液模型、相关的理论依据以及适用的范围;基于液滴在高速气流中的受力及液滴的形态分析,结合能量平衡理论,修正了液滴受力系数与形状因子,推导了新的气井携液模型;通过西北某疏松砂岩气田6000多井次气井积液实例分析数据,验证了模型的可靠性。基于疏松砂岩气田出砂机理,结合该气田气井生产出砂统计数据分析结果,分析了气体产量、生产压差、储层渗透率等参数对气井出砂的影响,建立了气井出砂预测方法,并进行了验证。本文研究了疏松砂岩气田气井积液规律与出砂机理,研究成果可用于对气井井筒积液与气井出砂的预测,为保证气井正常生产,确定合理工作制度,更好地解决气井出砂问题,保证正常生产提供了科学依据。
[Abstract]:The reservoir of a loose sandstone gas field in northwest China is a set of strata controlled by structure and controlled by a little lithology.The reservoir is clastic rock reservoir with high shale content, poor diagenesis, good physical property and strong heterogeneity. The lithology of the reservoir is mainly composed of siltstone with high shale content, argillaceous siltstone and a small amount of fine sandstone.Because of the early diagenesis stage, the characteristics of high porosity and high permeability are generally maintained.The gas field has many gas and water systems, the gas reservoir is surrounded by edge water, the reservoir lithology is loose and the cementation is poor.Therefore, in the development process of the loose sandstone gas field, especially in the middle and late stage of gas well production, it is often accompanied by gas well water production, wellbore fluid accumulation, sand production and so on.In view of the fluid accumulation phenomenon in the gas well bore during the production of the loose sandstone gas field, the paper analyzes and compares the previous liquid carrying model, the relevant theoretical basis and the scope of application with the critical liquid carrying and sand carrying model of the gas well as the research means.Based on the analysis of droplet force and droplet morphology in high speed airflow, and combined with the theory of energy balance, the force coefficient and shape factor of droplet are modified, and a new model of carrying liquid in gas well is deduced.The reliability of the model is verified by analyzing the data of fluid accumulation in more than 6000 wells in a loose sandstone gas field in northwest China.Based on the sand production mechanism of loose sandstone gas field, combined with the statistical data analysis of gas well production and sand production, the influence of gas production, production pressure difference and reservoir permeability on sand production of gas well is analyzed, and the sand production prediction method of gas well is established.And verified.In this paper, the fluid accumulation law and sand production mechanism of gas well in loose sandstone gas field are studied. The research results can be used to predict the sand production in gas well bore and gas well. In order to ensure the normal production of gas well, to determine the reasonable working system and to solve the sand production problem of gas well better,Ensuring normal production provides a scientific basis.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE37

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