天然气井布阀气举排水采气数值研究

发布时间：2018-06-10 02:31

本文选题：布阀气举 + 数值模拟　；参考：《东北石油大学》2017年硕士论文

【摘要】：随大庆油田深层气藏的深入开发,出水井数逐年增多,部分深层气井进入稳产后期,气井产能下降,井底压力逐年降低,水气比升高,出现多口高产水量深层气井,导致产气量呈断崖式下降,水淹特征明显。目前在大庆油田应用较成熟的泡沫排水采气技术对深层大产水量气井表现出一定的不适应性,机抽、电泵等机械排采技术成本较高且受泵抽深度限制均无法满足深层大产水量气井排水需求。本文在考虑大庆气田高产水量深层气井实际工况的基础上,开展布阀气举排水采气数值研究。研制了适用于深层气井高温高压井下环境的气举配套封隔器,封隔器采用液压坐封、上提解封方式,配套设计了回接插入密封段和解封打捞器;同时建立了气举阀检测与调试装置,并开展气举阀室内性能评价检测试验,提高了布阀气举管柱的安全可靠性。根据气液两相流基础理论建立了气举排液数值模型,并利用FLUENT软件进行布阀气举过程数值模拟,分析气举阀数量、布阀方式对气举效果的影响规律。模拟结果表明气举阀数量和阀间分布距离对气举工艺效果影响较大。根据3口高产水深层气井实际井况,结合数值模拟结果,优化设计了最佳的布阀气举工艺参数,包括注气类型、注气方式、气举管柱、注气量、注气压力、阀数量、布阀深度、开启压力等,现场试验表明该工艺排水采气效果良好。本文建立的气井布阀气举排水工艺优化设计方法,有效解决了硬举注气压力较高,布阀气举设计不合理等问题。研制的布阀气举配套工具满足大庆油田深层气井井况应用,可实现高产水量水淹气井成功复产,满足升深Y高产水区块整体治水的需求,可延长气田稳产周期,保证区块持续稳产。本课题的研究对大庆油田深层气井持续稳定开发具有重要意义。
[Abstract]:With the further development of deep gas reservoirs in Daqing Oilfield, the number of production wells increases year by year, and some deep gas wells enter the latter stage of stable production, the productivity of gas wells decreases, the bottom hole pressure decreases year by year, the ratio of water to gas increases, and many deep gas wells with high water production appear. As a result, gas production decreased precipitously, and the characteristics of water flooding were obvious. At present, foam drainage and gas recovery technology, which is mature in Daqing Oilfield, has shown some inadaptability to deep gas wells with large water production. The high cost of mechanical extraction technology such as electric pump and the limitation of pump pumping depth can not meet the drainage demand of deep gas wells with large water production. On the basis of considering the actual working conditions of deep gas wells with high water production in Daqing gas field, the numerical study of drainage gas recovery with valve gas lift is carried out in this paper. A gas lift Packer suitable for deep gas wells under high temperature and high pressure downhole environment is developed. The Packer adopts hydraulic seal setting, lifting and unsealing method, and reconnect insert seal section and unseal fishing device are designed. At the same time, the testing and debugging device of the gas lift valve is established, and the indoor performance evaluation test of the gas lift valve is carried out, which improves the safety and reliability of the air lift pipe string of the distribution valve. According to the basic theory of gas-liquid two-phase flow, the numerical model of gas-lift discharge was established, and the numerical simulation of the gas-lift process was carried out by using fluent software, and the influence of the number of gas-lift valves and the distribution mode on the gas-lift effect was analyzed. The simulation results show that the number of the gas lift valves and the distribution distance between the valves have great influence on the effect of the gas lift process. According to the actual well conditions of three deep gas wells with high production water and combined with the results of numerical simulation, the optimum parameters of valve distribution gas lift are optimized and designed, including gas injection type, gas injection mode, gas lift pipe string, gas injection volume, gas injection pressure, valve quantity and valve distribution depth. The field test shows that the process has good effect of drainage and gas production. In this paper, the optimized design method of gas lift drainage technology for gas well distribution valve is established, which effectively solves the problems of high pressure of hard lift gas injection and unreasonable design of gas lift distribution valve, etc. The gas lift tool developed in this paper can meet the application of deep gas well conditions in Daqing Oilfield, realize the successful recovery of high water production and flooded gas wells, meet the demand of integral water control in high depth Y high yield water block, and prolong the stable production period of gas field. Ensure continuous and stable production of the block. The research of this subject is of great significance to the sustained and stable development of deep gas wells in Daqing Oilfield.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE377

【相似文献】