4results about How to "Avoid secondary precipitation" patented technology

This invention discloses a combined process for restoring reservoir drainage and gas production channels using high-pressure drive and chemical dissolution, relating to the field of efficient oilfield exploitation technology. The process includes: S1, conducting production profile testing and sampling analysis of blockages in the target gas well to determine the type, distribution location, and reservoir physical parameters of the blockages, and preparing a corresponding chemical dissolving agent based on the analysis results. This invention couples the mechanical fracture-creating effect of high-pressure pulsed fluid with the cavitation effect and vibrational mass transfer effect of ultrasound. Based on the initial dissolution of blockages by the chemical dissolving agent, the stress waves generated by the high-pressure pulse expand the reservoir microfractures. Simultaneously, the collapse of microbubbles generated by ultrasound enhances the dissolution reaction rate, and the vibration promotes the dissolving agent's penetration into the micropores, achieving a synergistic effect of chemical dissolution and physical displacement, thoroughly removing blockages from the pore throats, and avoiding secondary precipitation of dissolution products.

The present invention relates to an oil and gas field acid solution system and an injection method, and relates to the technical field of oil and gas field development engineering. In terms of weight percentage, the oil and gas field acid solution system comprises the following components: 8-15% of hydrochloric acid, 3-7% of hydrofluoric acid, 1-5% of oxaloacetic acid, and 3-12% of additives; the remainder is water; the additive is obtained by compounding 1-heptyl-3-methylimidazolium bromide and a Schiff base compound shown in formula (I) in a weight ratio of 100:(21-37). The present invention adds oxaloacetic acid to the existing soil acid system, and simultaneously cooperates with an additive compounded with 1-heptyl-3-methylimidazolium bromide and a specific Schiff base compound, significantly improving the initial acidification speed of the system, and having excellent precipitation inhibition ability, avoiding the generation of secondary precipitation, and meeting the operating requirements of acidification of deep formations, and having good application prospects in exploitation such as sandstone reservoirs.

This invention discloses a method for preparing Polygonatum wine through co-fermentation of a compound microbial strain. Firstly, this invention provides a compound microbial fermentation agent composed of *Lactobacillus plantarum*, *Bacillus lactis*, and *Saccharomyces cerevisiae* in a mass ratio of 2–4:1–2:50–100. This compound microbial fermentation agent, through the synergistic effect of the compound microorganisms, effectively balances and improves the original bitterness of Polygonatum, significantly improving the overall quality of the Polygonatum wine; it accelerates the fermentation process, significantly shortens the fermentation cycle, and improves production efficiency, thereby reducing production costs. This invention further provides a method for preparing Polygonatum wine based on this compound microbial fermentation agent. This method exhibits significant effects in improving taste, increasing fermentation efficiency, enhancing product stability, reducing adverse metabolites, and improving nutritional and health benefits, thus meeting consumers' pursuit of high-quality Polygonatum health drinks.

The invention discloses a low-dust-precipitation plastic weaving master batch and a preparation method thereof, and belongs to the technical field of plastic processing aids. According to the master batch disclosed by the invention, a core-shell-halo structure filler and a double-effect additive system are synergistically designed, and metallocene linear low density polyethylene / polybutylene-1 blending carrier resin, a silane coupling agent and an SEBS-g-MAH (Styrene-Ethylene-Butylene-Styrene-g-Maleic Anhydride) compatilizer are matched. According to the preparation process, uniform dispersion and strong interface combination of all the components are realized through the processes of filler vacuum activation, high and low speed segmented mixing and precise temperature control melt extrusion. The dust precipitation amount of the obtained master batch in plastic weaving processing is as low as 0.28-0.45 mg / m and is reduced by 59%-75% compared with that of a traditional master batch, meanwhile, it is guaranteed that the tensile breaking strength of a product is larger than or equal to 3.5 cN / dtex, the elongation at break is larger than or equal to 152%, and the master batch is suitable for the field of plastic weaving products with high requirements for dust control and mechanical properties such as chemical raw material packaging and high-end transportation packaging.