Cationic water purifying agent and application of same in oilfield chemical flooding produced liquid

Abstract

The invention relates to a cationic water purifying agent and application of the same in an oilfield chemical flooding produced liquid. The cationic water purifying agent is prepared through the following steps: mixing dodecylamine, an emulsifier OP-10 and chloropropylene oxide, carrying out dissolving with stirring and then heating to 80 DEG C so as to obtain a mixed solution; adding a mixed liquor of an aqueous hexamethylene tetramine solution and dimethylamine into the mixed solution drop by drop; and after a reaction solution is cooled to 70 DEG C, adding acid to adjust the pH value of the reaction solution to 5, adding a catalyst, maintaining a temperature to be 70 DEG C, carrying out a reaction for 4 h and then cooling to room temperature so as to obtain the cationic water purifying agent. The invention further provides application of the cationic water purifying agent in purifying of an oilfield ternary composite flooding produced liquid. The cationic water purifying agent provided by the invention is a condensed type quaternary ammonium salt high polymer and has the advantages of a good flocculation effect, a small usage amount, low cost and a substantial purifying effect especially on the oilfield ternary composite flooding produced liquid.

Description

technical field [0001] The invention relates to a cationic water purifying agent and its application in oilfield chemical flooding production fluid, in particular to a quaternary ammonium cationic high-efficiency water purifying agent for oilfield chemical flooding production fluid and its application, belonging to the technical field of petrochemical industry . Background technique [0002] Oilfield chemical flooding production fluids include production fluids produced by chemical methods such as alkali flooding, active agent flooding, and polymer flooding for the purpose of enhancing oil recovery. [0003] Oilfield chemical flooding production fluid, especially ASP flooding production fluid is characterized by: high alkalinity, high content of polyacrylamide residual polymer, high content of surfactant, high content of suspended solids, high oil content, is A relatively stable oil-in-water negatively charged colloidal emulsion. Therefore, the purification treatment and r...

AI Technical Summary

Problems solved by technology

[0004] In this regard, conventional inorganic flocculants such as polyaluminum chloride have poor flocculation effects; anionic or non-ionic polymer flocculants have poor or no purification effects; cationic polymer water purifiers integrate The advantages of conventional inorganic flocculants and organic flocculants are more efficient, but for ASP flooding, there are still disadvantages of high cost and large dosage

Among various cationic polymer flocculants, the polycondensate of epichlorohydrin and dimethylamine has the lowest overall cost, but its flocculation efficiency for chemical flooding production fluid needs to be improved, and the main disadvantage is that the required dosage is relatively small Big

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