Study of the Effect of Additives on the Rheological Properties of Crude Oils and Asphaltene-Resi̇n-Paraffine Compounds

Abstract

Studies of the rheological properties of oil during transportation depending on the content of resinous components and on the intensity of asphalten-rezin-parphine deposits (ARPD). Exploitation and development of heavy oil fields requires the use of non-traditional methods of their extraction, collection and transportation by pipeline. The rheological properties of the oil are used as the primary source information for design and operation issues during field development and subsequent pipeline transportation. In practice, chemical, thermal and mechanical methods are often used together to clean the ARPD. In this case, the technological and economic effect is achieved as a result of the complete elimination of ARPD and the acceleration of the process. It is important to follow safety rules when using chemical methods in combination with mechanical and thermal methods. One of the main tasks of rheological research is to determine the relationship between the force acting on the environment under study and the deformation forces that occur under the influence of this force. The results of experimental studies of low-paraffinic and high-paraffinic oils show that the presence in the oil of a dispersed system of asphaltenes and resins can lead to depressant effects. In the process of completing the graduation qualification work were overview of ARPD, mechanism of formation and factors, influencing the formation of ARPD. Detailed description is given existing ARPD control technologies with results of pilot tests at various fields and presented comparative analysis of control methods. The study revealed the most effective technologies for prevention and removal of asphalt-resin-paraffin sediments, as well as proposed improvement of one of the methods combating ARPD. The conclusion concluded on the prospects of application technologies during operation of complicated well stock Azerbaijani. These technologies are useful for fields with high content of asphalt-resin-paraffin substances in oil, which leads to a decrease in production of well products. Effective viscosity and tensile strength were measured in a rotary rheometer REOTEST-2 using a measuring system in accordance with GOST 26581-85. The results of electron microscopic studies of the oil sample extracted from the Balakhani field show that only with the addition of BAF-1 reagent, the asphaltene-resin-paraffin associations are completely dissolved and dissolved in the volume of oil. According to the obtained results, it was found that asphalteno-resinous components are natural depressants that reduce the crystallization temperature of paraffin depending on the type of oil. Difron-4201 and BAF-1 were used in different proportions as additives in the article. BAF-1 and Difron 4201 reagents were added to the 1:1:1 ratio of paraffin-resin-asphaltene mixture in Balakhani heavy oil, respectively, in a 1:1 ratio of Difron 4201 and BAF-1 reagents. As a result of the 1:1 ratio of Difron 4201 and BAF-1 reagents to the mixture, the uniform distribution of parasite-resin-asphaltene asociates was observed, which is one of the main conditions for improving the oil relog. The effect of Difron-4201 and BAF-1 additives on the properties of the oil sample extracted from the higher paraffin Bulla field was studied. Difron-4201 and BAF-1 composites consisting of a 1:1 mixture were found to be more effective among the studied ARD additives, which reduces the freezing temperature of the oil sample in the range of 200-800 kg/ton. The optimal density of Difron-4201 and BAF-1 composites was determined to be 600 kg/ton. Similar studies were conducted on Balakhani heavy and Surakhani oil samples. After exposure of BAF-1 and Difron-4201 to resin-asphaltene-paraffin compounds separated from Bulla and Balakhani oil samples by their additives, their electron microscopic studies were studied. According to the research, it is more expedient to use a composite made of a mixture of reagents BAF-1 and Difron-4201 to improve the rheological properties of paraffin, resin, asphaltene oils. Keywords: viscosity, asphaltene, resin, paraffin, association, additive, Difron-4201, BAF-1.