Synthesis And Properties Evaluation Of Polymeric Viscosity Reducer For Heavy Oil

As an important energy and chemical raw material,petroleum resources play an important role in the development of the national economy and are an important strategic material of the country.Heavy oil resources occupy a large proportion in the production of petroleum industry due to their concentrated distribution and abundant reserves.Under this background,it is very important to study the technology of heavy oil to increase recovery factor,which has far-reaching significance for China's economic development.First,two types of surface-active polymerizable monomers were synthesized.One is an aromatic polyoxyethylene ether acrylate containing a benzene ring structure,and the other is an aliphatic polyoxyethylene ether acrylate containing a long-chain alkyl group.The two types of monomers were micellar copolymerized with other hydrophilic monomers respectively,and the surface-active amphiphilic polymer viscosity-reducing agent was obtained.Secondly,the synthesis conditions of the synthesized amphiphilic polymer viscosity reducer were optimized.The optimization results showed that:?1?the best experimental conditions for the synthesis of the di-tert-butylphenol amphiphilic polymer PAAD_n?n=10,15 and 20?are:the total monomer concentration is 20wt%,and the mass ratio of the three monomers is AM:AMPS:DP_n AA?n=10,15 and 20?=77:20:3,the experimental initiation temperature is 10?,the amount of APS is0.15%The amount of NaHSO₃ is 0.15%,the amount of AIBA is 0.02%,and the amount of SDS is 1.5%.?2?The optimal experimental conditions for the synthesis of13PAAC_x?x=12.5,15 and 17.5?containing tridecyloxy amphiphilic polymer are:the total monomer concentration is 20wt%,and the mass ratio of the three monomers is AM:AMPS:13C_x AA?x=12.5,15 and 17.5?=77.5:20:2.5,experimental initiation temperature is 10?,APS dosage is 0.12%,NaHSO₃ dosage is 0.12%,AIBA dosage is0.02%,SDS dosage is 2%.Finally,the performance evaluation of amphiphilic polymer viscosity reducer.The experimental results showed that the di-tert-butylphenol copolymer PAAD_n?n=10,15 and 20?and the tridecyloxy copolymer 13PAAC_x?x=12.5,15 and 17.5?It has a good thickening effect on the water phase and has certain temperature resistance,salt resistance and shear resistance.The polymer aqueous solution can reduce the oil-water interfacial tension to a low level,and the average contact angle with the heavy oil is small,and has good wettability.Both types of copolymers have a certain emulsifying viscosity reduction effect on the heavy oil.The viscosity reduction rate of di-tert-butyl phenolic polymer PAAD₁₀ can reach 82.6%.The viscosity reduction rate of the tridecyloxy polymer 13PAAC₁₅ is as high as 90.8%,and it has excellent viscosity reduction performance for heavy oil.At the same time,the mechanism of emulsification and viscosity reduction was also briefly analyzed.