Synthesis And Evaluation Of Polymer Viscosity Reducer For Crude Oil

The crude oil recovery is important in the Petroleum industry, because theresources of crude oil are plentiful in China. High viscosity, high density and poorflow ability of crude oil brought great difficulties to the Production and transportationof the crude oil. With the development of science and technology, the application ofamphiphilic polymer is also more widely. It has important value to improve its flowbehavior in production process by developing various chemical flows improve.At present, the main methods of exploitation of heavy oil for mixing light oilmethod with high fever mining method, these two methods consume energy more, theextraction efficiency is low. In order to improve the efficiency of crude oil recovery,the polymer viscosity reducer was gradually used.On the basis of summarization andexploration of the mechanism of viscosity reducer, the viscosity reducer which aimsto crude oil’s character was designed. Systematically study of the emulsifying effectthat contains emulsifier concentration, the oil-water ratio, temperature and otherfactors through the Brookfield DV-II+viscometer to test the viscosity of the emulsion.In addition to the amphiphilic comb polymers APEG/St/ODMA were synthesized byfree radical polymerization, and its solution properties were studied. The amphiphiliccomb polymer can self loaded micelles, and laid foundation for the micelles used incrude oil recovery.The article was divided into three parts:The first part described the crude oil and its components, and used theliquid-solid adsorption chromatography for separation of the crude oil components.Each component of the crude oil was analyzed using the nuclear magnetic resonancespectroscopy and infrared spectroscopy. The property of the crude oil and itscomponents was an important factor affecting the crude oil emulsion formation andstability. Can also in-depth study on the nature and structure of crude oil and itscomponents, in essence, to explain the in-water crude oil emulsion formed between the crude oil component and emulsifier, crude oil fractions the role of relationship.The resin and aspartames, saturates, aromatics content of the total were36.96%,5.67%,27.12%and30.25%and free water content of13.11%. Contrast to the~1HNMR and FTIR of these three components, substances similar to the benzene ringstructure, and the long carbon chain alkenes were found.The second part was the preparation and application of crude oil emulsifier.Through analysis the content and structure of the various components of the crude oil,suitable emulsifier for the crude oil was prepared. Systematically study of theemulsifying effect that contains emulsifier concentration, the oil-water ratio,temperature and other factors through the Brookfield DV-II+viscometer to test theviscosity of the emulsion. At the temperature of45℃, when the emulsifier contentwas2.7%and oil-water ratio of was60:40, the viscosity of the emulsion was thelowest. The viscosity of the emulsion from40,0000mPa.s reduced to00mPa.s.Emulsifier particles of crude oil can be clearly observed through a microscope.The third part of was to prepare the polymer viscosity reducer for crude oil. Ascommonly the octadecyl acrylate was used to prepare polymer viscosity reducer forcrude oil. The octadecyl acrylate was easily hydrolysis in the environment of hightemperature and alkalinity. This paper attempted to use ODMA instead of octadecylacrylate as monomer. The polymer viscosity reducer for crude oil was synthesized byODMA, St and APEG. The structure and performance of the polymer were tested. Themicelles in aqueous solution were tested in order to measure its emulsifying properties.The structure and molecular weight of the polymer were characterized by FT-IR,1H-NMR and GPC; the viscosity of the polymer solution, state and morphology ofmicelle formed in the polymer solution were characterized by Ubbelohde viscometer,DLS and TEM. It showed that, APEG、 St and ODMA had synthesizedAPEG/St/ODMA comb polymer. Amphiphilic comb polymers APEG/St/ODMA weresynthesized by free radical polymerization, and its solution properties were studied.The structure and molecular weight of the polymer were characterized by FT-IR,1~H-NMR and GPC; the viscosity of the polymer solution, state and morphology ofmicelle formed in the polymer solution were characterized by Ubbelohde viscometer, DLS and TEM. It showed that, APEG、 St and ODMA had synthesizedAPEG/St/ODMA comb polymer. The polymer synthesized by APEG monomer shouldbe oligomers; the micelles formed by APEG/St/ODMA polymer solution werecomplied with the law of formation-increase-gathered, its critical micelleconcentration was about0.3g/L; the micelles were more stable than the micellaraggregates in the APEG/St/ODMA solution, so it would be propitious to preparestable micellar system. The core-shell structure of micelles can be clearly observedthrough TEM and the average size of micelle was about200nm.Through the study of the crude oil viscosity reducer for this series of polymers,polymer viscosity reducer in the oil field will bring new ideas and broad prospects.