塔中地区鹰山组碳酸盐岩酸岩反应规律研究

发布时间：2018-01-06 01:10

本文关键词：塔中地区鹰山组碳酸盐岩酸岩反应规律研究　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：酸化压裂是塔中地区储层改造的重要技术手段。该地区常用胶凝酸和温控变黏酸提高酸蚀距离,沟通储集空间。但目前国内外学者对于胶凝酸和温控变黏酸酸岩反应规律的研究并不深入,不能为酸压设计提供有效数据,严重影响了施工效果,因此有必要深入研究胶凝酸、温控变黏酸与灰岩的酸岩反应规律。本文在广泛调研国内外关于酸岩反应理论与实验研究现状的基础上,通过引用Mitschka旋转圆盘对流扩散速度场模型,在酸岩反应受传质控制的条件下,考虑了酸液剪切稀释性对传质的影响,建立了反应表面酸液的H+传质模型,得到了反应表面酸液剪切速率、H+有效扩散系数、酸岩反应动力学参数和反应活化能的理论计算方法。流变性能测试发现,胶凝酸与温控变黏酸普遍表现为非牛顿剪切稀释性流体。温度、酸浓度对胶凝酸的表观黏度影响不大。随着稠化剂浓度的增大,胶凝酸表观黏度增大。而温控变黏酸的表观黏度受其交联度的控制,温度越低、酸浓度越小时,温控变黏酸的交联度越小,可能会出现未交联现象；温度越高、酸浓度越大时,温控变黏酸的交联度越大,可能会出现过交联、破胶现象。酸岩反应动力学实验发现,酸岩反应速率与剪切速率的关系均可以用二项式表示,可以预测表面反应速率,温度、酸浓度影响温控变黏酸H+传质速率的主要原因是其影响温控变黏酸的黏度。而温度、酸浓度影响胶凝酸酸岩反应速率的主要原因是其对H+活跃程度的直接影响。最后计算得到了不同实验条件下胶凝酸和温控变黏酸的H+有效扩散系数、酸岩反应动力学参数；得到了胶凝酸与灰岩的反应活化能为18.0357kJ/mol,温控变黏酸与灰岩的反应活化能为22.1656kJ/mol。研究表明,对于酸岩反应规律,必须结合酸液黏度变化来分析才能得到准确的认识。酸压施工时,应该结合该工区的酸岩反应规律,这样才能设计出有效的施工程序,保证酸压工艺效果。
[Abstract]:Acid fracturing is an important technical means for reservoir in Tazhong area. The commonly used gelling acid and temperature control in the area of variable viscosity acid acid to improve the communication distance, reservoir space. But the research scholars at home and abroad for gelled acid and temperature controlled variable viscosity acid rock reaction rules are not deep, cannot provide effective data for acid fracturing the design, has seriously affected the construction effect, it is necessary to study the law of gelled acid, acid rock reaction temperature variable viscosity acid and limestone.
Based on the extensive research at home and abroad on the acid rock reaction theory and experimental study on the basis of the status quo, by referencing the Mitschka rotating disc convection diffusion velocity model in acid rock reaction by mass transfer controlled conditions, considering the effect of acid fluid shear thinning on mass transfer, established the H+ model of mass transfer surface acid reaction. The surface acid reaction H+ shear rate, effective diffusion coefficient, calculation of acid rock reaction kinetic parameters and reaction activation energy theory method.
Rheological properties test found that gelled acid and temperature variable viscosity acid generally showed non Newtonian shear thinning fluid. Temperature, acid concentration on the apparent viscosity of gelled acid has little effect. With the increase of thickener concentration, the apparent viscosity increases gelled acid. And the temperature controlling variable viscosity and apparent viscosity by acid control of the cross-linking degree, the lower the temperature, acid concentration decreased, temperature controlled variable viscosity acid crosslinking degree is small, there may be no cross-linking phenomenon; the higher the temperature is, the greater the acid concentration, temperature and variable viscosity acid crosslinking degree bigger, there may be cross, gel breaking phenomenon.
It is found that the dynamic experiment of acid rock reaction, acid rock reaction rate and shear rate all can use the binomial that can predict the surface reaction rate, temperature, acid concentration mainly affect the temperature control of variable viscosity acid H+ transfer rate is the influence of temperature variable viscosity acid viscosity. While the temperature, acid concentration of main factors affecting the gelling acid rock reaction rate was the most direct influence degree of H+. The final calculation of gelled acid and temperature under different experimental conditions of variable viscosity acid H+ effective diffusion coefficient is obtained. The kinetic parameters of acid rock; the gelled acid and limestone reaction activation energy is 18.0357kJ/mol, temperature controlled variable viscosity acid and limestone the reaction activation energy is 22.1656kJ/mol.
Research shows that for acid rock reaction law, we must combine acid viscosity analysis to get accurate understanding. When acid fracturing is applied, we should combine the acid rock reaction rule in this area, so as to design effective construction procedures and ensure the effect of acid fracturing process.

【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】：TE357.2

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