In this work, the swelling, transformation, and dissolution of clay minerals after steam injection in heavy oil reservoir were investigated, and the damage mechanism of steam injection was discussed to research the microscopic mechanism of clay minerals on reservoir damage during steam injection in unconsolidated sandstone. The results show that the swelling of clay minerals increases with the increase of the pH of the brine and decreases with the increase of the salinity of the brine. As we all know, the swollen clay minerals are liable to fall from the inner wall of the pass, which may cause the blockage of reservoirs. What is more, the environment of high temperature and high pH would promote the transformation of the clay minerals. Montmorillonite can be transformed into illite and analcime, and kaolinite can be transformed—due to the water sensitivity of the clay mineral—to montmorillonite and analcime, whereas illite is relatively stable. For the movement of particles in the reservoir during the injection of steam, the water sensitivity of clay mineral montmorillonite and the new clay minerals analcime can easily plug the small reservoir pore, which is one of the main ways to cause damage to the reservoir during steam injection. The dissolution of clay minerals increases with the increase of temperature and increases with the increase of the pH of the brine. The dissolution of clay minerals would produce a large number of particles and make the rock matrix more loose, which may cause some reservoir damage, such as reservoir collapse, and so on.

中文翻译：

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粘土矿物对未固结砂岩注汽过程中储层损害的微观机制

本文研究了稠油油藏注蒸汽后黏土矿物的溶胀，转变和溶解，探讨了注蒸汽的破坏机理，研究了非固结砂岩注水过程中黏土矿物对油藏破坏的微观机理。 。结果表明，粘土矿物质的溶胀随盐水pH值的增加而增加，随盐水盐度的增加而减小。众所周知，溶胀的粘土矿物很容易从通道的内壁掉落，这可能会导致储层堵塞。此外，高温和高pH值的环境将促进粘土矿物的转化。蒙脱石可以转变为伊利石和方解石，由于粘土矿物对水的敏感性，高岭石可以转变为蒙脱石和方解石，而伊利石则相对稳定。对于注入蒸汽过程中储层中的颗粒运动，粘土矿物蒙脱土和新型粘土矿物止水剂的水敏感性很容易堵塞小储层孔隙，这是在蒸汽过程中破坏储层的主要方法之一注射。黏土矿物的溶解度随着温度的升高而增加，并且随着盐水的pH值的升高而增加。粘土矿物的溶解会产生大量的颗粒，并使岩石基质更加疏松，这可能引起一些储层破坏，例如储层塌陷等。伊利石相对稳定。对于注入蒸汽过程中储层中的颗粒运动，粘土矿物蒙脱土和新型粘土矿物止水剂的水敏感性很容易堵塞小储层孔隙，这是在蒸汽过程中破坏储层的主要方法之一注射。黏土矿物的溶解度随着温度的升高而增加，并且随着盐水的pH值的升高而增加。粘土矿物的溶解会产生大量的颗粒，并使岩石基质更加疏松，这可能引起一些储层破坏，例如储层塌陷等。伊利石相对稳定。对于注入蒸汽过程中储层中的颗粒运动，粘土矿物蒙脱土和新型粘土矿物止水剂的水敏感性很容易堵塞小储层孔隙，这是在蒸汽过程中破坏储层的主要方法之一注射。黏土矿物的溶解度随着温度的升高而增加，并且随着盐水的pH值的升高而增加。粘土矿物的溶解会产生大量的颗粒，并使岩石基质更加疏松，这可能引起一些储层破坏，例如储层塌陷等。粘土矿物蒙脱土和新型粘土矿物止水剂对水的敏感性很容易堵塞小储层孔隙，这是在注汽过程中破坏储层的主要途径之一。黏土矿物的溶解度随着温度的升高而增加，并且随着盐水的pH值的升高而增加。粘土矿物的溶解会产生大量的颗粒，并使岩石基质更加疏松，这可能引起一些储层破坏，例如储层塌陷等。粘土矿物蒙脱土和新型粘土矿物止水剂对水的敏感性很容易堵塞小储层孔隙，这是在注汽过程中破坏储层的主要途径之一。黏土矿物的溶解度随着温度的升高而增加，并且随着盐水的pH值的升高而增加。粘土矿物的溶解会产生大量的颗粒，并使岩石基质更加疏松，这可能引起一些储层破坏，例如储层塌陷等。