气水同产水平井井筒压力及产能计算研究

发布时间：2018-01-31 02:08

本文关键词： 水平井井筒压力产能气水同产耦合　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以气水同产水平井气水两相流为研究对象,综合采用渗流力学、采气工程、计算数学等方法,对气水同产水平井的产能和井筒压降进行研究,取得了以下成果。 (1)调研并归纳了气水两相管流流型研究成果,分直井段、斜井段、水平段分别总结了各段的流型分类、流型判别条件及判别流程。 (2)分直井段、斜井段、水平段分别建立了压降计算模型,编制了计算程序,用现场实例对计算结果进行了验证,并分析了产量、水气比、油管内径对井筒压降的影响。通过将井斜数据导入程序的方法,把斜井段计算结果的精准度提高了一个台阶。且该方法简单易操作,具有较强的普适性。 (3)在归纳分析经典水平井气井、水平油井产能的基础上,建立了基于相渗曲线的气水同产水平井产能计算方法,并对影响产能的因素进行了分析。该方法的优点是可快速地将任意水平气井及水平油井的产能公式推导为两相水平井的产能公式,而无需从渗流部分开始推导。 (4)通过质量守恒原理将水平井筒变质量流和气藏地层渗流耦合起来,建立了考虑井筒变质量流的气水同产水平井压降模型。通过软件编程实现了模型的求解,获得了水平段沿程压降分布及产量分布,并分析了储层厚度、油管内径及生产水气比等因素对压降分布及产量分布的影响。 (5)通过导入水平井段井斜数据的方法,获得了考虑重能压降的水平井筒变质量流和气藏地层渗流的耦合结果。由于实例中的水平段起伏较大且不规则,故该耦合结果规律性也不明显。但该方法开拓出了一个以往学者们没有考虑到的视角,是一次非常有意义的尝试。
[Abstract]:In this paper, the gas-water two-phase flow in gas-water co-producing horizontal wells is taken as the research object. The productivity and wellbore pressure drop of gas-water co-producing horizontal wells are studied by comprehensively adopting the methods of seepage mechanics, gas production engineering and calculation mathematics. The following results have been achieved. 1) the research results of flow pattern in gas-water two-phase pipe flow are investigated and summarized. The flow pattern classification, flow pattern distinguishing conditions and discriminating flow process are summarized respectively in the straight well section, inclined well section and horizontal section. The calculation model of pressure drop is established in the vertical section, the inclined section and the horizontal section, and the calculation program is compiled. The calculation results are verified by a field example, and the production rate and the ratio of water to gas are analyzed. The influence of tubing inner diameter on wellbore pressure drop. By introducing well deviation data into program, the accuracy of calculation results of inclined well section is improved by a step. This method is simple and easy to operate and has strong universality. 3) on the basis of induction and analysis of gas well and horizontal well productivity of classical horizontal well, the productivity calculation method of gas-water horizontal well with same production rate is established based on phase permeability curve. The advantage of this method is that the productivity formula of any horizontal gas well and horizontal well can be quickly deduced into the productivity formula of two-phase horizontal well. It does not need to be derived from the seepage section. 4) Coupling horizontal wellbore variable mass flow with gas reservoir percolation by mass conservation principle. The pressure drop model of gas-water horizontal wells with variable mass flow is established. The solution of the model is realized by software programming, and the distribution of pressure drop and output along horizontal section is obtained, and the reservoir thickness is analyzed. The influence of the inner diameter of tubing and the ratio of production water to gas on the pressure drop distribution and output distribution. 5) the coupling results of variable mass flow in horizontal wellbore and formation percolation of gas reservoir considering heavy energy pressure drop are obtained by introducing well deviation data of horizontal well section, because of the large fluctuation and irregularity of horizontal section in the example. Therefore, the regularity of the coupling results is not obvious, but this method opens up a visual angle which has not been considered by scholars in the past, and is a very meaningful attempt.
【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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