Nanometer poly-silicon emulsion and preparing method and application thereof

Abstract

The invention discloses a nanometer poly-silicon emulsion. The nanometer poly-silicon emulsion is prepared from 40-50 parts of hydrophobic nanosilicon dioxide, 10-15 parts of a sodium hydroxide aqueous solution, 10-15 parts of fatty alcohol-polyoxyethylene ether AEO-9, 8-10 parts of sodium alpha-olefin sulfonate and 5-10 parts of cocoalkanoylamido propyl betaine in 300-500 parts of deionized water. According to the formula proportion, part of the deionized water, fatty alcohol-polyoxyethylene ether AEO-9, sodium alpha-olefin sulfonate and cocoalkanoylamido propyl betaine are taken and uniformly mixed to be heated and stirred until a solution is clarified, cooling is conducted, the hydrophobic nanosilicon dioxide and the sodium hydroxide aqueous solution are added, the PH value is controlled to 8-10, the remaining part of deionized water is added, heating is conducted until the materials are boiled, turbid and then clarified, and then the nanometer poly-silicon emulsion is obtained. According to the nanometer poly-silicon emulsion, secondary pollution can be reduced, and the problems are effectively solved that in the later development period, the water injection pressure is high, the water injection amount does not meet the injection allocation requirement, and the injection increase validity period is short.

Description

technical field [0001] The invention relates to the technical field of pressure-reducing and increasing injection agents, in particular to a nano-polysilicon emulsion and its preparation method and application. Background technique [0002] Low-permeability reservoirs generally refer to reservoirs with petroleum geological reservoir permeability K less than 50×10-3 μm2. Low-permeability reservoirs are often classified into ordinary low-permeability reservoirs (K is 10×10-3~50×10-3 μm2) 3μm 2), ultra-low permeability reservoirs (K is 1×10-3~10×10-3μm 2 ) and ultra-low permeability reservoirs (K is 0.1×10-3~1×10-3μm 2 ), The reservoirs with reservoir permeability less than 0.1×10-3μm2 are called tight reservoirs. Water injection production is the main production method of low permeability tight oil reservoirs. However, low-permeability tight oil reservoirs have the characteristics of special microscopic pore structure, small pores, fine throats, and large pore-to-surface rat...

AI Technical Summary

Problems solved by technology

However, low-permeability tight oil reservoirs have the characteristics of special microscopic pore structure, small pores, fine throats, and large pore-to-surface ratio, which lead to prominent problems such as large seepage resistance, high water injection pressure, small water injection volume, and unbalanced injection and production. resulting in low oil recovery

In the later stage of development, the water injection pressure is high, the water injection volume is small, and the injection and production are unbalanced, resulting in large seepage resistance

Therefore, the water injection pressure often rises rapidly, the water injection volume drops rapidly, or even no water can be injected, resulting in a rapid decline in oil production.

[0003] At present, strong acid is commonly used to treat water injection wells, which is effective quickly, but the effect is poor for reservoirs with low permeability, and it will cause secondary pollution to the formation, and the effect of repeated acidification is getting worse and worse, and the overall construction cost is high.