安岳气田须二凝析气藏油气水关系研究

发布时间：2018-03-18 15:48

本文选题：凝析气田　切入点：油气水关系　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,凝析气田在世界油气田开发中占据着举足轻重的位置,高效开发凝析气田已然成为油气开采的重要问题。然而,低渗透凝析气田通常存在储层物性差,渗透率低等特点,致使此类气田稳产能力弱。安岳须二气藏为低渗致密砂岩凝析气藏,工区内单井动储量普遍较低。随着生产进行,气藏地层压力逐渐降低,地层水不断侵入到井筒,部分气井出现了携液困难的情况；且反凝析现象使得气相渗流能力减弱,气井产能降低。因此,开展安岳须二气藏油气水关系研究,对于气藏合理生产有着十分重要的现实意义。本文是在气藏油气水关系分析方法建立的基础上,结合动静态资料,综合研究得到气藏油气水关系。首先,从气藏地质及测试资料出发,研究了油气水关系静态特征；其次,建立了气水、油气关系动态分析方法,研究了气水、油气关系动态特征；最后,在油气水关系结论的基础上,研究了气藏产液井携液能力,提出了合理的排液采气措施。通过分析,取得了以下主要成果： (1)平面上,天然气主要分布在储层物性较好,且地震振幅随偏移距变化现象较明显的含气有利区,产水井主要呈西南—东北分布,原油井主要分布在局部洼地及鼻突构造附近；纵向上,产气层主要分布在须二2亚段,水层、气水层及原油产层主要分布在须二2下亚段及须二’亚段。 (2)在水侵动态理论研究的基础上,建立了水侵能量分析方法,实例分析结果显示,该方法适合于安岳须二气藏水侵动态分析。 (3)通过油气相平衡理论研究,建立了单井油气界面分析方法,并计算得到了取样井油气界面。 (4)通过油气水关系动态特征分析表明,气藏水侵整体弱,局部强；纵向上无统一油气界面。 (5)在携液模型对比基础上,研究了气藏产液井携液能力,结合实际生产情况得到,气藏大部分单井能正常生产,仅有13口出现携液困难。
[Abstract]:At present, condensate gas field plays an important role in the development of oil and gas field in the world. High efficiency development of condensate gas field has become an important problem in oil and gas production. However, low permeability condensate gas field usually has the characteristics of poor reservoir physical property and low permeability, etc. As a result, the stable production capacity of this kind of gas field is weak. Anyue No. 2 gas reservoir is a condensate gas reservoir with low permeability and tight sandstone, and the dynamic reserves of single well are generally low in the working area. With the development of production, the formation pressure of the gas reservoir decreases gradually, the formation water invades to the wellbore, and some gas wells have difficulty in carrying liquid. The reverse condensate phenomenon weakens the gas phase percolation ability and reduces the gas well productivity. Therefore, it is of great practical significance to study the oil-gas-water relationship of Anyue Xuer gas reservoir for the rational production of the gas reservoir. In this paper, based on the establishment of the analysis method of oil-gas-water relationship in gas reservoir, combined with the dynamic and static data, the oil-gas-water relationship in the gas reservoir is comprehensively studied. Firstly, the static characteristics of oil-gas-water relationship are studied based on the geological and test data of the gas reservoir; secondly, the static characteristics of the oil-gas-water relationship are studied. The dynamic analysis method of gas-water and oil-gas relationship is established, and the dynamic characteristics of gas-water and oil-gas relationship are studied. Finally, on the basis of the conclusion of oil-gas-water relationship, the liquid carrying capacity of liquid-producing wells in gas reservoirs is studied. The reasonable measures of discharging liquid and gas are put forward. Through analysis, the main results are as follows:. (1) on the plane, natural gas mainly distributes in the favorable gas-bearing area where the reservoir physical property is good, and the seismic amplitude varies obviously with the migration distance. The producing wells are mainly distributed in the southwest to northeast, and the crude oil wells are mainly distributed near the local depressions and nasal outburst structures. Longitudinally, the gas producing beds are mainly distributed in Xuer 2 submember, water layer, gas water layer and crude oil production layer are mainly distributed in the lower part of Xuer 2 and Xuer 'submember. 2) on the basis of the theoretical study of water invasion dynamics, a water invasion energy analysis method is established. The results of practical analysis show that this method is suitable for water invasion analysis of Anyue Xuer No. 2 gas reservoir. 3) based on the study of hydrocarbon phase equilibrium theory, a single well oil-gas interface analysis method is established, and the oil-gas interface of the sampling well is calculated. 4) through the analysis of the dynamic characteristics of oil-gas-water relationship, it is shown that the whole water invasion of the gas reservoir is weak and local strong, and there is no unified oil-gas interface in the longitudinally. On the basis of comparison of liquid carrying models, the liquid carrying capacity of liquid producing wells in gas reservoirs is studied. Combined with actual production conditions, it is obtained that most single wells in gas reservoirs can be produced normally, and only 13 wells have difficulty in carrying liquid.
【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】：TE312

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