2results about How to "Reduce mass transfer rate" patented technology

The application discloses an online mixing-free variable-viscosity high-resistance-slowing acid, and provides an online mixing-free variable-viscosity high-resistance-slowing acid system, wherein the performance of acid liquid can be changed by changing the adding amount of the agent, and the acid liquid does not need to be prepared in advance. The film-forming agent can form an adsorption film on the surface of rock, and the adsorption film blocks the contact between H+ and rock, thereby slowing the acid-rock reaction rate. The application also has multiple composite slow-down performances, and combines the characteristics of foam slow-down acid and gelling slow-down acid. Through the thickening and slowing down of the multiple-effect agent and the blocking and slowing down of the film-forming agent, the acid-rock reaction rate is greatly reduced under the double slow-down effect of the two. In addition to the good thickening effect, the application also has excellent resistance-reducing performance, and one agent is used for multiple purposes to reduce the adding amount and type of the additive. Meanwhile, the resistance-reducing rate of the system reaches more than 85%, which is much higher than the 70% of the traditional system.

The application provides a triazine three-arm long-chain amide quaternary ammonium salt corrosion inhibitor and a preparation method and application thereof, and relates to the technical field of oil and gas field acidification corrosion prevention.The method comprises the following steps: long-chain fatty acid and N,N-dimethylethylenediamine are mixed according to a molar ratio of 1:1-1.5, a catalyst is added, and a condensation reaction is carried out under a protective atmosphere to obtain a long-chain fatty amide intermediate; the long-chain fatty amide intermediate and cyanuric chloride are mixed according to a molar ratio of 3.0-3.6:1, and a substitution reaction is carried out in an organic solvent; after the reaction, the solvent is removed under reduced pressure, washing, recrystallization or vacuum drying are carried out, and the triazine three-arm long-chain amide quaternary ammonium salt corrosion inhibitor can be obtained.The corrosion inhibitor is a three-arm cationic corrosion inhibitor with a s-triazine ring as a core and three long-chain fatty amide quaternary ammonium salt side arms as functional units, and can solve the problems of slow film formation, insufficient long-acting stability and reduced corrosion efficiency of the existing acidification corrosion inhibitor in the solid organic acid anhydride retarding acid system.