A preparation method of core-shell ceramsite fracturing proppant for oil and gas collection

Abstract

The invention relates to a preparation method of a core-shell ceramsite fracturing proppant for oil and gas collection, comprising: (1) pulverizing municipal sludge containing organic matter, then granulating and drying to obtain a core precursor. (2) Mix clay and scrap iron powder evenly, then add water and stir evenly to obtain inner coating layer slurry. (3) Mix the clay and water and stir evenly to obtain the outer coating layer slurry. (4) Immerse the core precursor in the inner coating layer slurry to make the outer surface uniform, then take out the inner core precursor to dry, and then immerse the obtained particles in the outer coating layer slurry to make the outer surface uniform Hang the slurry, then take out the particles and dry them. After the completion, arrange the particles evenly, and then calcinate. After the completion, the ceramsite fracturing proppant is obtained. The core-shell type fracturing proppant of the present invention not only has low density, but also has good compression resistance, and realizes the purpose of reducing the density of the fracturing proppant while maintaining its good compression resistance.

Description

technical field [0001] The invention relates to the technical field of fracturing proppants, in particular to a preparation method of a core-shell type ceramsite fracturing proppant used for oil and gas collection. Background technique [0002] Fracturing proppant is mainly used in deep wells and fracturing reconstruction of high-pressure oil and gas layers. The fracturing proppant is driven into the cracks of the fractured rock formation through high-pressure carrier fluid, and plays a role in supporting the cracks from closing due to stress release, thereby maintaining High conductivity, make the oil and gas unimpeded, increase production. Practice has proved that fracturing with the addition of fracturing proppant can increase production by more than 30%, effectively improving the efficiency of oil and gas collection. [0003] The main raw material of traditional fracturing proppant is bauxite, which is crushed and finely ground into fine powder and then sintered at high...

AI Technical Summary

Problems solved by technology

[0003] The main raw material of traditional fracturing proppant is bauxite, which is crushed and finely ground into fine powder and then sintered at high temperature after compounding with additives. After sintering, the main crystal phase is usually corundum phase, which has a high density, resulting in the The density is high, which affects the subsequent use of the carrier fluid to carry it into the rock formation

However, the density of the fracturing proppant should not be too low, otherwise the compressive strength of the fracturing proppant cannot meet the demand

[0004] In order to overcome the above-mentioned problems, some studies have achieved certain results by using composite materials to prepare low-density fracturing proppants, but these technologies generally have problems such as complex processes, high raw material costs, and unsuitability for large-scale production. More importantly, it did not reduce the density of the fracturing proppant while maintaining its good compression resistance, resulting in poor overall performance of the fracturing proppant