Abstract: The present disclosure relates to the field of oilfield plugging agents, and in particular to a plugging agent for oil extraction in an oilfield and a preparation method therefor and an application thereof.

Abstract: The present invention provides a preparation method of Beta molecular sieve, comprising: activating a mineral having low silica-to-alumina ratio and a mineral having high silica-to-alumina ratio, respectively, wherein the mineral having low silica-to-alumina ratio is activated via a sub-molten salt medium, and the mineral having high silica-to-alumina ratio is activated via means of high-temperature calcination; mixing the activated minerals with sodium chloride, potassium chloride, water and template agent for hydrothermal crystallization, wherein the charged amounts of the raw materials satisfies a molar ratio of: 0.03-0.18 Na2O: 0.01-0.03 K2O: 0.1-0.4 (TEA)2O: 1 SiO2: 0.01-0.5 Al2O3: 12-40 H2O; cooling the crystallized product and removing the mother liquor by filtration, washing the resulting filter cake with water to neutral and drying it to obtain the Beta molecular sieve.

Abstract: The present invention provides a preparation method of Beta molecular sieve, comprising: activating a mineral having low silica-to-alumina ratio and a mineral having high silica-to-alumina ratio, respectively, wherein the mineral having low silica-to-alumina ratio is activated via a sub-molten salt medium, and the mineral having high silica-to-alumina ratio is activated via means of high-temperature calcination; mixing the activated minerals with sodium chloride, potassium chloride, water and template agent for hydrothermal crystallization, wherein the charged amounts of the raw materials satisfies a molar ratio of: 0.03-0.18 Na2O:0.01-0.03 K2O:0.1-0.4 (TEA)2O:1 SiO2:0.01-0.5 Al2O3:12-40 H2O; cooling the crystallized product and removing the mother liquor by filtration, washing the resulting filter cake with water to neutral and drying it to obtain the Beta molecular sieve.

Abstract: The present invention relates to a synthesis method of zeolite 4A, wherein natural clay mineral, provided as the total silicon source and aluminum source required for molecular sieve synthesis, is activated before they are crystallized under hydrothermal conditions to synthesize zeolite 4A. In the method of the present invention, a simple process is employed and inexpensive raw materials are used, resulting in zeolite 4A having a whiteness of 90% or more and a calcium ion exchange capacity of no less than 310 mg CaCO3/g zeolite. According to the present invention, the range of raw materials for the preparation of molecular sieve materials is broadened, and therefore not only the cost for molecular sieve production is greatly reduced by using the sub-molten salt activation method, but also the greenness in the production process of molecular sieve materials is significantly improved.