靖边气田增压开采动态分析

发布时间：2018-04-14 06:10

本文选题：增压开采 + 动态特征　；参考：《西南石油大学》2015年硕士论文

【摘要】：靖边气田位于鄂尔多斯盆地东部,是长庆气区的重要气田。目前靖边气田进入开发中后期,气藏资源和气藏压力迅速下降,部分气井井口压力已经接近甚至低于输气管网入网压力；气田储层非均质性明显,产水井、间开井比重增大,为了提高气田采收率、稳产能力和产量,2010年起,靖边气田对老井开始增压开采。随着增压开采井数目的增加,需要监测和评价增压开采的工艺技术和开发效果。靖边气田位于陕西与内蒙古交界处,主要含气气层位于奥陶系马家沟组,主力储层是马五段。碳酸盐岩储层岩石微裂缝发育,主力气层马五1+2气层孔隙度5.2%。天然气类型为干气,微含硫,二氧化碳含量基本不变。气藏无边底水,为封闭定容气藏。压力分布为沿着西南-东北方向,地层压力逐步降低。气藏具有统一的地温梯度,说明为统一的地温场。本文对靖边气田南8-9-14增压站的增压气井进行生产动态分析,生产动态分析表明南8-9-14站气井基本不产地层水,为干气气井。基于气井增压前后日产气量、气井产能指数、气井单井控制储量对增压效果进行评价。对比了增压前后各气井的日产气量；使用Topaze历史拟合法计算了增压开采时各气井的当前地层压力,使用平均参数方法计算了南8-9-14增压站各气井增压前后的井底流压,计算了气井增压前后的产能指数；使用流动物质平衡法计算了气井增压开采前后的单井控制储量。分析表明增压开采可以显著提高日产气量、产能指数和单井控制储量,改善开发效果。运用一点法经验公式和理论计算公式评价气井增压后的产能,考虑到理论计算公式更符合实际流动情况,采用理论公式计算值计算的无阻流量作为气井无阻流量。分别使用经验法、采气指数法和节点分析法分析了气井合理工作制度。基于高速非达西渗流原理,为了提高地层能量的使用效率,基于采气指数法配产产量制定气井合理工作制度。目前的气井配产量高于优化后的气井产量,需要降低配产。对增压开始后按照合理工作制度生产时不同时间的地层压力进行了预测,拟合结果表明按照优化过的工作制度生产可以延缓地层压力下降速度,目前的配产偏高,需要进行优化处理,降低配产；针对气井增压开采后期定产降压和定压降产两个生产阶段,编制软件绘制了气井的生产动态预测曲线,以本文中计算的合理产量预测了气井稳产时间、稳产末期地层压力、稳产末期采出程度和采出程度增幅,计算了各气井稳产结束时间。
[Abstract]:Jingbian gas field, located in the eastern part of Ordos Basin, is an important gas field in Changqing gas area.At present, in the middle and late stage of development of Jingbian gas field, the gas reservoir resources and gas reservoir pressure are rapidly decreasing, the wellhead pressure of some gas wells is close to or even lower than that of the gas transmission network, the reservoir heterogeneity of the gas field is obvious, and the proportion of production wells and open wells increases.In order to improve oil recovery, stable production capacity and production, Jingbian gas field began pressurized production of old wells in 2010.With the increase of the number of pressurized production wells, it is necessary to monitor and evaluate the process technology and development effect of pressurized production.Jingbian gas field is located at the junction of Shaanxi and Inner Mongolia, the main gas-bearing reservoir is located in Majiagou formation of Ordovician, and the main reservoir is Ma-5 formation.The rock microfractures of carbonate reservoir are developed, and the porosity of the main gas layer Ma 512 is 5.2.Natural gas type is dry gas, slightly sulfur, carbon dioxide content is basically unchanged.The gas reservoir has boundless bottom water, which is a sealed and constant volume gas reservoir.The pressure distribution is along the southwest-northeast direction, the formation pressure gradually reduces.The gas reservoir has a uniform geothermal gradient, indicating a unified geothermal field.In this paper, the production performance of the pressurized gas well at the South 8-9-14 booster station in Jingbian Gas Field is analyzed. The analysis of the production performance shows that the gas well of the South 8-9-14 Station basically does not produce formation water and is a dry gas well.Based on the daily gas production before and after pressurization, the productivity index of gas wells and the controlled reserves of single well in gas wells, the pressurization effect is evaluated.The daily gas production of each gas well before and after pressurization is compared, the current formation pressure of each gas well during pressurized production is calculated by using Topaze historical fitting method, and the bottom hole flow pressure before and after pressurization of each gas well in Nan8-9-14 turbocharging station is calculated by using the average parameter method.The productivity index of gas well before and after pressurization is calculated and the controlled reserves of single well before and after pressurized production of gas well are calculated by using the method of flowing material balance.The analysis shows that pressurized production can significantly increase daily gas production, productivity index and controlled reserves of single well, and improve the development effect.The one-point empirical formula and theoretical calculation formula are used to evaluate the productivity of gas wells after pressurization. Considering that the theoretical calculation formula is more in line with the actual flow situation, the unobstructed flow rate calculated by the theoretical formula is used as the unhindered flow rate of the gas well.The rational working system of gas wells is analyzed by means of empirical method, gas recovery index method and node analysis method respectively.Based on the principle of high-speed non-Darcy percolation and in order to improve the efficiency of using formation energy, the reasonable working system of gas wells is established based on the production ratio of gas production index method.The current gas well production is higher than that of the optimized gas well, so it is necessary to reduce the production.The formation pressure at different time after production according to the reasonable working system is predicted. The fitting results show that the optimized working system can delay the falling rate of formation pressure, and the current distribution production is higher.The production performance prediction curves of gas wells are drawn up by software aiming at the two production stages of constant production and constant pressure drop in the later stage of gas well pressurization production.The reasonable production rate calculated in this paper is used to predict the stable production time of gas well, the formation pressure at the end of stable production, the recovery degree and the increase of recovery degree at the end of stable production, and the end time of steady production of each gas well is calculated.
【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】