The Effect And Mechanism Of Acrylamide And Its Derived Polymers On The Asphaltene Structure Of Crude Oil

A new molecular structure model analysis method is proposed by improving the molecular structure analysis methods which are proposed by Yen-Mullins, Rogel and Takanohashi. This new model analysis method is combined with the physical centroid theory and the Helen theorem of geometrical mathematics to realize accurate quantitative analysis of outside influence factor. The influence of environmental factors on the structure of asphaltene molecular aggregates and the mechanism of action can be quantitatively analyzed and the structure change of asphaltene molecular aggregates can be more accurately analyzed from the molecular structure level, which can overcome the previous defects of structural model analysis method of Yen-Mullins, Rogel and Takanohashi, whose analysis results are vague and not specific.This new molecular structure model analysis method is combined with the acrylamide molecular polymer which is widely used in crude oil extraction process, to test and verify rationality, reliability and adaptability of this new structural model analysis method. The mechanism of acrylamide polymer molecular chain with different polymerization degree on the asphaltene molecular structure was analyzed. In order to study the influence of polar groups and nonpolar groups on acrylamide molecules, new functional group were introduced through Amorphous Cell module and Discover module. Chlorine atom group, bromine atom group and nitro group were introduced respectively as typical polar groups, methyl, ethyl typical as typical non-polar groups. These new polymers with different functional groups of acrylamide molecules were chlorine acrylamide molecular polymer, bromine acrylamide molecular polymer, nitroacrylamide molecular polymer, butenamide molecular polymer, pentenamide molecular polymer.By analyzing the influence of the introduction of polar and non-polar functional groups on the interaction mechanism between acrylamide molecular chain and asphaltene molecule, changing the degree of polymerization of the newly-formed derivative polymer having different functional groups, controlling the temperature of the system composed of the asphaltene molecule and the newly-formed derivative polymer, the mechanism of the interaction between the polymer molecules and the asphaltene molecules and the degree of the influence and the changing trend were analyzed by the factors such as the polarity of the functional groups, the polymerization degree of the polymer chains and the temperature of the system.It is found that the effect of bromoacrylamide molecular polymer on the structure of asphaltene molecular aggregates was the most significant, and the structure deformation of asphaltene molecular aggregates was increased by 1781.903% at 298K. The influence of temperature on the introduction of non-polar functional group acrylamide molecular chain and the introduction of polar functional group of the acrylamide molecular chain is often not the same. The mechanism is:non-polar functional groups into the molecular chain belong to the interaction between ? electrons with ? electrons, and polar functional groups into the molecular chain belong to the interaction between p electrons with ? electrons. The effect of temperature on the two types of electron conjugation is not consistentThe results of this new molecular structural model analysis method and its research results can also be consistent with theoretical prediction and logical reasoning results, which further validates the reliability, stability and adaptability of this new structural model analysis method. This new molecular structural model analysis method and the application of its research results will be very beneficial for the practical engineering application development of new crude oil asphaltene precipitation inhibitor to provide a new theoretical basis and improve the research direction, reduce unnecessary repetition test, development costs and shorten the development cycle of new products which have important economic value.