The Development Of Supper Heavey Oil Demulsifier In Low Temperature

The world oil-gas have been mined for many years, and the crisis is becoming more and more serious. The crude oil which has better quality become more and more less, so the difficult exploitation of oil, abundant heavy oil resource is taken seriously more and more, according to the survey, China’s heavy oil current output accounts for about ten percent of the total production of crude oil heavy oil resource, and it cannot be ignored, however heavy oil exploitation now still facing many difficulties, such as the emulsion breaking about super heavy oil produced liquid is one of them.generally super heavy oil refers to the more asphaltene colloid content, and high viscosity crude oil, at the same time in super heavy oil, and the asphaltene and colloid is natural emulsifier. in the crude oil extraction process, the emulsion type is complex, there is an oil-in-water emulsion, also has a water in oil emulsion, or double and multiple emulsion, and the emulsion formed from stable structure, so the breaking about the super heavy oil is difficult, which has seriously affected the heavy oil exploitation and transportation, and the study about the breaking of super heavy oil is special very important.An oilfield in China due to the use of some measures of increasing production of super heavy oil such as steam huff and puff joined the preflush, as well as the steam assisted gravity unloading technology, it can improve the super heavy oil production, but the various technology allows the use of heavy oil produced liquid becomes more and more complex, and the existing demulsifier cannot meet the requirements. When add demulsifier for dehydration in super heavy oil, the result exceed the standard about standard demulsifier, so it make oil yield loss not only in heavy, but also increase the difficulty of sewage treatment. This study on demulsifier in super heavy oil has a realistic significance for super heavy oil produced liquid treatment, and the development of super heavy oil demulsifying agent in actual production will have very broad market prospects.In this paper, from many years about the basis of the study on demulsifier, and aimed at mining process of heavy oil in a certain oil field, research the properties about produced liquid, using the basic theory of demulsifier demulsification and dehydration, combined with the actual situation of oilfield, and develop the qualified chemical treatment agent by means of experiment for super heavy oil. This paper mainly carried out the following work:(1) Firstly this paper carried out large number of extensive literature research about crude oil demulsifier, analysis of the history and various types about demulsifier for crude oil demulsifier development, while a more detailed description and research methods about the super heavy oil demulsifier at low temperature is presented in this paper, and associating the emulsion basic theory analyzes the characteristics of heavy oil emulsion, through the analysis summarized and presented the technical route and main research contentsin in this paper, and made the solid theoretical foundation for effective demulsifier in super heavy oil demulsifying agent.(2) This paper analyses super heavy oil property and the composition in super heavy oil for some oil field, also analyses its rheological properties and study the formation causes in super heavy oil emulsion and types of formation and emulsion composition. through the basic properties of heavy oil emulsion, this paper proceed emulsion stability research and analyses the variety affecting factor impact of the heavy oil, and obtain much detailed various natures in research object, and this result are basis for developing the emulsion demulsifier for super heavy oil effectively.(3) Based on the research results, this paper carried out the laboratory research about the heavy oil emulsification of produced liquid type and heavy oil composition and properties. through the single agent selection, selected the optimization and effective super heavy oil demulsifier for super heavy oil emulsion, and proceed the mixed research using the effective demulsifier, through chain extension synthesis, optimized the demulsification conditions, determine the optimal demulsifier formulations ultimately, and through a series of modern material test method, analyses the effect about the super heavy oil demulsifier;(4) Also this paper analyses the impact about the temperature which can be affect the effect about the in super heavy oil emulsion largely and studied how the demulsifier creating effect at low temperature by experimental method in emulsion breaking, in the condition of the water carry more oil demulsification, this paper designs the research train of thought using flocculant to complement, and optimized agent formula of super heavy oil demulsifying, through many experiments and analysis, developed the flocculant for super heavy oil under the condition of low temperature, and carried the performance evaluation for the flocculant, the results show that the agent can effectively reduce the problem of high oil content in water;(5) Finally using the super heavy oil demulsifying agent in a super heavy oil produced fluid, the results show that:at the present temperature of the field demulsification, utilizing this paper developed demulsifying agent in the lower10-15DEG, the operation effect is well, the target have reached the oil demulsification and dehydration standardized, which show that the super heavy oil demulsifying agent which this paper developed is a kind of excellent performance demulsifying agent.