碳酸盐岩储层非常规酸化改造

发布时间：2018-05-02 03:19

本文选题：碳酸盐岩 + 酸化　；参考：《西南石油大学》2016年硕士论文

【摘要】：酸化技术在碳酸盐岩储层增产作业中得到广泛的应用,酸液体系的设计与选择是其中非常重要的一环。但常规酸液体系在实际施工过程中存在反应速率过快、腐蚀性强、难以形成有效酸蚀蚓孔等问题。针对碳酸盐岩储层,本文研制了一种具有缓速、长效、深穿透能力强等特性的新型非常规酸液体系HR,并以之为核心技术提出了一套碳酸盐岩储层非常规酸化改造工艺。本文主要进行了如下工作：(1)通过核磁共振等微观分析方法分析了HR非常规酸液体系的主体结构,利用滴定实验绘制出酸度曲线；从理论与实验的双重角度出发分别分析了HR体系的多级电离特性、吸附成膜特性以及螯合特性,对该体系的各项性能从机理上进行分析论证；确定了该体系与碳酸盐岩反应时的主要反应机理为酸化反应与螯合反应共同作用。(2)通过实验手段对HR非常规酸液体系的各项性能进行了评价,并与常规酸液体系的各项性能进行了对比。讨论了动态条件下,pH值、反应温度以及转速对碳酸盐岩的溶蚀能力的影响,并获取了不同温度条件下HR体系的有效传质系数；通过螯合滴定实验测定了HR体系对各金属离子的螯合力,所得结果均优于常规螯合酸液体系；利用岩芯流动实验对各种酸液体系的蚓孔刻蚀能力进行对比分析,实验结论表明在相同条件下HR体系更易在碳酸盐岩芯中形成高导流能力的酸蚀蚓孔；在高温条件下,HR体系能够保证良好的缓蚀性能,满足行业标准。(3)围绕HR非常规酸液体系的特性,提出碳酸盐岩储层非常规酸化改造相关工艺。通过推导建立仅适用于螯合酸液体系的碳酸盐岩蚓孔扩展数学模型,得出了蚓孔增长速率与突破体积模型；给出了酸液用量、最佳注酸速率、关井时间等相关施工参数的计算方法。(4)结合碳酸盐岩储层条件,模拟了不同温度下HR非常规酸液体系的最佳注酸速率,并结合现场施工时最大泵注压力的需求和限制,可以对HR非常规酸液体系的pH值进行优选；绘制了碳酸盐岩储层非常规酸化最佳注酸速率模板,为碳酸盐岩储层非常规酸化工艺提供了指导作用。通过本论文的研究,提出了一套适用于碳酸盐岩储层基质深穿透酸化的非常规酸液体系,并以该体系为核心技术形成了对现场施工具有实际指导意义的非常规酸化工艺。本论文的研究成果对碳酸盐岩储层酸化提出了一种新方法,能够解决目前常规碳酸盐岩储层酸化过程中存在的一些问题,对今后碳酸盐岩储层酸化技术的发展具有一定的指导意义。
[Abstract]:Acidizing technology has been widely used in carbonate reservoir production, and the design and selection of acid system is very important. However, the conventional acid solution system has some problems such as too fast reaction rate and strong corrosiveness, so it is difficult to form effective acid wormhole. In this paper, a new unconventional acid system HRs with the characteristics of slow speed, long effect and strong penetration ability is developed for carbonate reservoir, and a set of unconventional acidizing modification technology for carbonate reservoir is put forward. The main work of this paper is as follows: (1) the main structure of HR unconventional acid system is analyzed by means of nuclear magnetic resonance (NMR) and the acidity curve is drawn by titration experiment. The multistage ionization characteristics, adsorption film-forming characteristics and chelating characteristics of HR system were analyzed from the view of theory and experiment, respectively. The main reaction mechanism of this system is acidizing reaction and chelating reaction. The performance of HR unconventional acid solution system is evaluated by means of experiment. The properties of the system were compared with those of the conventional acid system. The effects of pH value, reaction temperature and rotational speed on the dissolution capacity of carbonate rock under dynamic conditions were discussed, and the effective mass transfer coefficients of HR system at different temperatures were obtained. The chelating force of HR system to various metal ions was measured by chelating titration experiment, and the results obtained were superior to those of conventional chelate acid system. The experimental results show that it is easier for HR system to form acid wormhole with high conductivity in carbonate core under the same conditions, and that HR system can guarantee good corrosion inhibition performance at high temperature. According to the characteristic of HR unconventional acid system, the related technology of unconventional acidizing modification of carbonate reservoir is put forward. A mathematical model of vermis pore expansion in carbonate rock is established, which is only suitable for chelate acid system, and the growth rate and breakthrough volume model of vermis pore are obtained, and the amount of acid solution and the optimum acid injection rate are given. According to carbonate reservoir conditions, the optimum acid injection rate of HR unconventional acid system at different temperatures is simulated, and the requirement and limitation of maximum pump injection pressure during field operation are combined. The pH value of HR unconventional acid system can be optimized, and the optimum acid injection rate template of unconventional acidification in carbonate reservoir is drawn, which provides guidance for unconventional acidification process in carbonate reservoir. Through the research of this paper, a set of unconventional acid system suitable for deep penetration acidification of carbonate reservoir matrix is put forward, and the unconventional acidizing process with practical guiding significance for field construction is formed with this system as the core technology. The research results of this paper propose a new method for acidification of carbonate reservoirs, which can solve some problems existing in the acidification process of conventional carbonate reservoirs. It has certain guiding significance for the development of acidizing technology of carbonate reservoir in the future.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE357.2

【相似文献】