Demulsification enhancer, preparation method and application thereof

Abstract

The present disclosure relates to an emulsification enhancer, wherein the emulsification enhancer is made from the following components by weight: 3.8-18 parts of melamine, 0.1-2.7 parts of urea, 2-9.6 parts of monoaldehyde, 0.2-8.4 parts of dialdehyde, 0.9-4.8 parts of hydrochloric acid (HCl) and 56.5-93 parts of water. The present disclosure provides a preparation method of the demulsification enhancer and the application of the demulsification enhancer as an auxiliary agent in the improvement of oil demulsification. The demulsification enhancer of the present disclosure can assist a traditional demulsifier to accelerate the three-phase separation of oil, water and sludge in the oilfield produced-fluid, which is helpful to efficiently extract crude oil from oil sludge emulsion layer and water, reduce oil footprint of the oilfield flowing to the environment, reduce energy consumption of crude oil dehydration and carbon emission of the oilfield, and achieve good three-phase separation effect of oil, water and sludge.

What is claimed is: 
     
         1 . An emulsification enhancer made from the following components by weight:
 3.8-18 parts of melamine, 0.1-2.7 parts of urea, 2-9.6 parts of monoaldehyde, 0.2-8.4 parts of dialdehyde, 0.9-4.8 parts of hydrochloric acid (HCl) and 56.5-93 parts of water.   
     
     
         2 . The emulsification enhancer according to  claim 1 , wherein the dialdehyde is selected from any one or several of glyoxal, malondialdehyde, succinaldehyde and glutaric dialdehyde. 
     
     
         3 . The emulsification enhancer according to  claim 1 , wherein the monoaldehyde is selected from any one or several of formaldehyde, acetaldehyde, propionaldehyde and butyraldehyde. 
     
     
         4 . A preparation method of the emulsification enhancer according to  claim 1 , comprising the following steps:
 S1: taking 2-9.6 parts by weight of monoaldehyde and 0.2-8.4 parts by weight of dialdehyde, adding them to 56.5-92.93 parts by weight of water, and mixing to form an aldehyde liquid;   S2: adding 3.8-18 parts by weight of melamine into the aldehyde liquid formed in the step S1 and mixing them to form a mixed solution;   S3: adding 0.9-4.8 parts by weight of HCl into the mixed solution formed in the step S2 to form an acid liquor;   S4: subjecting the acid liquor formed in the step S3 to an aldehyde-amine condensation reaction to form an aldehyde-amine solution; and   S5: adding 0.1-2.7 parts by weight of urea into the aldehyde-amine solution formed in the step S4 to conduct a polymerization reaction to form the demulsification enhancer.   
     
     
         5 . The preparation method according to  claim 3 , wherein in the step S3, the formed acid liquor has a pH value of 1-3. 
     
     
         6 . The preparation method according to  claim 3 , wherein in the step S4, the aldehyde-mine condensation reaction of the acid liquor comprises:
 adjusting the acid liquor to conduct a first heat preservation reaction at a first temperature; and   adjusting the acid liquor to conduct a second heat preservation reaction at a second temperature after the first heat preservation reaction.   
     
     
         7 . The preparation method according to  claim 6 , wherein the first temperature is 85-90° C., and the first heat preservation reaction is conducted for 0.2-1 h. 
     
     
         8 . The preparation method according to  claim 6 , wherein the second temperature is 92-96° C., and the second heat preservation reaction is conducted for 0.1-0.3 h. 
     
     
         9 . The preparation method according to  claim 4 , wherein the polymerization reaction is conducted at 60-70° C. for 0.1-0.5 h. 
     
     
         10 . An application of the demulsification enhancer according to  claim 1  as an auxiliary agent in the improvement of oil demulsification.