非均质碳酸盐岩储层基质酸化三维仿真模拟研究

发布时间：2018-09-08 15:24

【摘要】：基质酸化作为一种解除近井带伤害的常用手段,在实际生产中取得了较好的成效。而对于碳酸盐岩储层,基质酸化在解除近井带伤害的同时,还能沟通微裂缝,起到增产效果。对于储层物性较好的储层,基质酸化相比于酸化压裂,具有成本低,见效快的优势。海外油气田多为储层本身物性较好且天然微裂缝比较发育的储层,故碳酸盐岩储层基质酸化技术拥有广阔的应用前景。碳酸盐岩储层基质酸化过程中酸蚀蚓孔的预测和描述是设计、效果预测的技术关键点之一。本文充分调研分析了目前关于蚓孔发育的模型,建立了基于双重尺度模型并考虑了孔渗非均质性及矿物非均质性等多种因素的三维蚓孔扩展模型,并对该模型进行了数值求解及结果分析。通过论文的研究,主要取得了以下成果和认识：(1)通过调研大量的文献资料及室内试验,选取了双重尺度模型作为三维模型的基础并加以改进。(2)针对随机法生成孔隙度场进行了改进,使用正态分布函数生成部分数据点并使用克里金插值法进行数据完善,生成具有一定空间连续性的岩心孔隙度物理场。使用同样的思路完成了矿物分布非均质物理场的生成。(3)基于三维块中心网格和有限体积法,对三维模型进行了数值求解及结果显示。进行了大量的模拟分析及对比。模拟结果表明：注入速度、温度、非均质性、岩石矿物分布等因素对蚓孔的生长都会有影响。本文的研究成果对碳酸盐岩基质酸化蚓孔扩展机理研究可以提供一个有效的工具和验证手段,对酸化设计可以进行科学指导。无论在理论上和现场应用上都有一定的意义。
[Abstract]:Matrix acidification, as a commonly used method to relieve near well zone damage, has achieved good results in practical production. For carbonate reservoir, matrix acidification can not only relieve the damage of near well zone, but also can communicate microfractures and increase production. Compared with acidizing fracturing, matrix acidizing has the advantages of low cost and quick effect for reservoirs with better reservoir physical properties. Most overseas oil and gas fields are reservoirs with good physical properties and relatively developed natural micro-fractures, so the matrix acidizing technology of carbonate reservoir has a broad application prospect. The prediction and description of acid wormhole in carbonate reservoir matrix acidification is one of the key points of design and effect prediction. In this paper, the current models of wormhole development are investigated and analyzed, and a three-dimensional wormhole expansion model is established based on the dual scale model and considering many factors, such as porosity and permeability heterogeneity, mineral heterogeneity and so on. The model is solved numerically and the results are analyzed. Through the research of the thesis, the following achievements and understandings have been obtained: (1) through the investigation of a large number of documents and laboratory experiments, The dual scale model is selected as the basis of the 3D model and improved. (2) the porosity field generated by the random method is improved, the normal distribution function is used to generate some data points and the Kriging interpolation method is used to perfect the data. The physical field of core porosity with certain spatial continuity is generated. The inhomogeneous physical field of mineral distribution is generated using the same idea. (3) based on the three-dimensional block central grid and the finite volume method, the numerical solution and the results of the three-dimensional model are presented. A large number of simulation analysis and comparison were carried out. The simulation results show that the injection rate, temperature, heterogeneity, rock mineral distribution and other factors will affect the growth of the wormhole. The research results in this paper can provide an effective tool and verification method for the study of the spreading mechanism of acidified vermis pores in carbonate matrix, and can be used as a scientific guide for acidizing design. Both in theory and in the field of application have a certain significance.
【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

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