水平气井生产动态分析及配产制度研究
发布时间：2018-08-21 11:07
【摘要】：近年来,水平井逐渐成为气藏开发的主要手段,特别是随着低渗透气藏在我国天然气储量比例中的上升,使用水平井成为开发低渗气藏最有效的手段。但也由于其使用于气藏时间不长、特别是低渗气藏的使用,使得对水平井生产、气藏渗流等理论研究都还不完善。因此对于气藏水平井产能、生产系统分析及配产研究具有重要意义。 本文主要通过大量文献建立考虑启动压力的气藏水平井二项式产：能方程,分析启动压力梯度、表皮系数、水平井长度、气藏厚度、气藏各向异性对水平井产能影响,其次以水平井根端为节点,对水平井系统进行节点分析,分析了井口压力、地层压力、表皮系数、油管内径等对气井生产过程的影响,得出随着表皮系数降低,气井产能加速上升,通过节点分析油管内径,内径越大,产量越高,但增加幅度逐渐放缓。通过建立气藏渗流与水平井筒管流耦合模型,分析水平段井筒压力及产量随位置变化关系,得出随着水平段长度增加,水平段压降对水平井产量影响增加,相对于生产压差,影响很小。并通过建立直井段、倾斜段、水平段临界携液模型,针对直井段和倾斜段分别考虑高气液比、低气液比条件气井的临界携液状态,计算临界携液流量,得出随着产水量增加,低气液比临界携液流量要明显大于高临界携液流量。最后采用节点分析法、临界携液流量法、采气指数法、经验法分析气井配产,得出节点分析法为气井最高配产制度,而临界携液为保证气井正常生产的最低配产。最后通过物质能量平衡法对水平井进行单井储量及稳产末期压力分析和稳产年限分析,为气藏开发提供有效理论依据,通过编制水平气井合理工作制度软件,软件整体按照论文思路对水平井进行产能分析、生产动态分析、配产分析及稳产能力研究,对实际水平气井配产、生产系统分析具有重要的指导作用。
[Abstract]:In recent years, horizontal wells have gradually become the main means of gas reservoir development, especially with the increase of low permeability gas reservoirs in the proportion of natural gas reserves in China, the use of horizontal wells has become the most effective means to develop low permeability gas reservoirs. However, due to its use in gas reservoirs for a short time, especially the use of low permeability gas reservoirs, the production of horizontal wells, gas reservoir percolation and other theoretical studies are not perfect. Therefore, the analysis of production system and the study of production distribution are of great significance for horizontal well productivity of gas reservoir. In this paper, the binomial energy equation of gas reservoir horizontal well considering start-up pressure is established through a large number of literatures. The effects of starting pressure gradient, skin coefficient, horizontal well length, gas reservoir thickness and gas reservoir anisotropy on horizontal well productivity are analyzed. Secondly, taking the root end of horizontal well as the node, the joint analysis of horizontal well system is carried out, and the influence of wellhead pressure, formation pressure, skin coefficient, inner diameter of tubing on the production process of gas well is analyzed, and it is concluded that with the decrease of skin coefficient, The productivity of gas well increases rapidly. The larger the inner diameter of the tubing is, the higher the production is, but the increasing range is slowing down gradually through the nodal analysis of the inner diameter of the tubing. By establishing the coupling model of gas reservoir percolation and horizontal well bobbin flow, the relationship between wellbore pressure and production rate with the position of horizontal section is analyzed. It is concluded that with the increase of horizontal section length, the influence of horizontal section pressure drop on horizontal well output increases, relative to the production pressure difference. The impact is small. By establishing the critical liquid carrying model of vertical well section, inclined section and horizontal section, considering the critical liquid carrying state of gas well with high gas-liquid ratio and low gas-liquid ratio, the critical liquid carrying rate is calculated, and the results show that the critical liquid carrying rate increases with the increase of water production. The critical liquid carrying rate of low gas liquid is obviously larger than that of high critical liquid carrying rate. Finally, the nodal analysis method, critical liquid carrying rate method, gas recovery index method and empirical method are used to analyze the gas well production. It is concluded that the nodal analysis method is the maximum production system of the gas well, and the critical liquid carrying method is the minimum production rate to ensure the normal production of the gas well. Finally, through the method of material and energy balance, the single well reserves, the pressure analysis at the end of the stable production period and the stable production life analysis are carried out for horizontal wells, which provides an effective theoretical basis for gas reservoir development, and through compiling the reasonable working system software for horizontal gas wells, According to the idea of the paper, the software has an important guiding role in productivity analysis, production dynamic analysis, production distribution analysis and stable production ability research for horizontal gas well distribution and production system analysis.
【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
本文编号：2195527
[Abstract]:In recent years, horizontal wells have gradually become the main means of gas reservoir development, especially with the increase of low permeability gas reservoirs in the proportion of natural gas reserves in China, the use of horizontal wells has become the most effective means to develop low permeability gas reservoirs. However, due to its use in gas reservoirs for a short time, especially the use of low permeability gas reservoirs, the production of horizontal wells, gas reservoir percolation and other theoretical studies are not perfect. Therefore, the analysis of production system and the study of production distribution are of great significance for horizontal well productivity of gas reservoir. In this paper, the binomial energy equation of gas reservoir horizontal well considering start-up pressure is established through a large number of literatures. The effects of starting pressure gradient, skin coefficient, horizontal well length, gas reservoir thickness and gas reservoir anisotropy on horizontal well productivity are analyzed. Secondly, taking the root end of horizontal well as the node, the joint analysis of horizontal well system is carried out, and the influence of wellhead pressure, formation pressure, skin coefficient, inner diameter of tubing on the production process of gas well is analyzed, and it is concluded that with the decrease of skin coefficient, The productivity of gas well increases rapidly. The larger the inner diameter of the tubing is, the higher the production is, but the increasing range is slowing down gradually through the nodal analysis of the inner diameter of the tubing. By establishing the coupling model of gas reservoir percolation and horizontal well bobbin flow, the relationship between wellbore pressure and production rate with the position of horizontal section is analyzed. It is concluded that with the increase of horizontal section length, the influence of horizontal section pressure drop on horizontal well output increases, relative to the production pressure difference. The impact is small. By establishing the critical liquid carrying model of vertical well section, inclined section and horizontal section, considering the critical liquid carrying state of gas well with high gas-liquid ratio and low gas-liquid ratio, the critical liquid carrying rate is calculated, and the results show that the critical liquid carrying rate increases with the increase of water production. The critical liquid carrying rate of low gas liquid is obviously larger than that of high critical liquid carrying rate. Finally, the nodal analysis method, critical liquid carrying rate method, gas recovery index method and empirical method are used to analyze the gas well production. It is concluded that the nodal analysis method is the maximum production system of the gas well, and the critical liquid carrying method is the minimum production rate to ensure the normal production of the gas well. Finally, through the method of material and energy balance, the single well reserves, the pressure analysis at the end of the stable production period and the stable production life analysis are carried out for horizontal wells, which provides an effective theoretical basis for gas reservoir development, and through compiling the reasonable working system software for horizontal gas wells, According to the idea of the paper, the software has an important guiding role in productivity analysis, production dynamic analysis, production distribution analysis and stable production ability research for horizontal gas well distribution and production system analysis.
【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
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