Dolomite mineralization method

Abstract

The invention provides a dolomite mineralization method, comprising the steps of: (1) fully immersing the porous medium material in the dolomite mineralization liquid, and vacuumizing the system to maintain a vacuum state; Keep it under pressure for 2-5 hours, then return to normal pressure and keep it for 10-20 hours, so that the above-mentioned internal space is filled with fully saturated CaCO3 mineralized liquid. (3) The temperature or pressure in the container is raised from room temperature and normal pressure to 600-1200°C, 5-10MPa, and kept for 20-48 hours to complete the mineralization of dolomite on the inner surface of the porous media material, and then return to Temperature and pressure. This method can realize dolomite mineralization in difficult-to-reach positions such as the inner surface of porous media; it can make dolomite mineralization form a thinner dolomite film, which is higher than the existing co-precipitation or ion exchange methods. Calcite; can realize the simulation of dolomite reservoir core in the oil and gas field.

Description

Technical field [0001] The invention relates to the field of dolomite processing, in particular to a dolomite mineralization method. Background technique [0002] Dolomite is a trigonal system of CaMg (CO 3 ) 2 , Is one of the most common carbonate minerals and one of the most difficult to simulate synthetic minerals. There was a large number of dolomite in the marine strata of the Paleozoic. According to research, its formation may be related to the slow action of sulfate-reducing bacteria. However, it is difficult to synthesize dolomite under low-temperature seawater conditions in modern laboratories. The Dolomite Problem". [0003] Dolomite formation is one of the main oil reservoirs in the world, and it has the common characteristics of porous media. The study of dolomite reservoirs not only faces the difficulty of artificial synthesis of dolomite, but also the artificial simulation of dolomite porous media. At present, some materials are commonly used in academia to replace...

AI Technical Summary

Problems solved by technology

The study of dolomite reservoirs not only faces the difficulty of artificial synthesis of dolomite, but also the artificial simulation of dolomite porous media

At present, some materials are commonly used in the academic circles to replace dolomite reservoirs, such as porous sandstone, porous 3D printing models, etc., but due to the different chemical compositions of materials, the surface properties are very different from those of dolomite. The surface and interface properties such as wettability, adsorption and polarity are very different, which restricts the development of research in this field.

[0004] At present, there is no method for uniform dolomite mineralization on the inner surface of porous media containing internal spaces such as pores, cracks, and cavities. Therefore, it is necessary to provide a mineralization treatment method to achieve dolomite mineralization on the inner surface of porous media materials.