Study On The Design And Synthesis Of Multiple Copolymer And Its Application In Oil Field

With the development of the tertiary oil recovery technology, the properties of the produced liquid become more complex and stable.make it difficult to dehydrate the produced liquid. The traditional demulsifiers can not meet the existing treatmen requirements. Multivariate copolymerization can be achieved on the structure and property of the polymer in the process of the dehydrating agent,Which becomes one of the most effective way to the research of new type demulsifier in recent years.Langmuir-Blodgett(LB) technique was used to research the stabilities of oil-water interfacial films in this paper. Design and synthesis of a series of quaternary copolymer macromolecule dehydrating agent aiming at the stabilities. And the relevant tests and site test are made to select best effect of dehydrating agent. The main research conclusions are as following.1.Langmuir-Blodgett(LB) technique was used to research the stabilities of oil-water interfacial films. Studies have shown that with the increase of polyacrylamide's concentration in water phase, oil-water interfacial film stability increased.2. The predehydrant have been prepared with the method of emulsion polymerization and the appropriate ratio of monomer dosing and the best reaction conditions are choosed by the orthogonal experiment and The structure of the quaternary copolymer predehydrant is characterized by infrared spectroscopy, which indicates that the structure coincide with the anticipated. The best ratio of monomer to prepare the polymer are as following, m(BA) = 25 g, m(MMA) = 8 g, m(St) = 8 g, m(AA) = 3 g, 75?, 4.5 h, 0.5%, 6% respectively are the best reaction temperature reaction, time, dosage of initiator and emulsifier dosage.3. Laboratory comparative evaluation showed that with the rising of temperature and dosing of concentration increased, predehydrant can make the the produced fluid's dehydration rate and dehydration speed rate increase. But the oil content in the dehydrated water is reduced with the increase of drug concentration and has no obvious relationship with the temperature. At 30?, 50 mg/L's concentration, the predehydrant WH-2's dehydration rate was 96.23%, oil content in the dehydrated water is 89.6 mg/L. When the WH-2 and ZP-1 are mixed together, the mass ratio is 1:2, the best dosing concentration is 50 mg/L and the demulsification temperature is 50?. At 30?,50 mg/L's concentration, the predehydrant WH-2's dehydration rate was 97.36%, oil content in the dehydrated water is 143.1 mg/L. Reached the technical indexes.4.The results of site test show that the WH-2 and ZP-1 with a mass ratio of 1:2, 1:4, 1:5 and make the dehydration rate up to 98%, the oil content in the dehydrated water less than 160 mg/L. And can make the minimum dosing concentration reduced to 9 mg/L at the same time. Could save as much as 50% of the cost. And be able to cut manifold pressure below 0.6 MPa and increase the mass of everday's produced oil.