Research On Flow Rules In The Pumping Wells Producing Oil Of High Pour Point

Electrical trace heating is the dominating factor to influence the developing cost of high pour point oil, therefore, how to effectively reduce the immense energy consumption and cost of wells producing high pour point oil is an important research topic for more economic and efficient exploitation. Taking the pumping wells of Shen84-An12 block of ShenYang oilfiled for the studying object, this paper maked a research on the law of wellbore multiphase flow in the pumping wells producing high pour point oil, which could help to enhance understanding of the boundary conditions of the cold pumping of high pour point oil and perfectly provide a theoretical basis and technical support for efficient development of high pour point oil.First of all, the paper maked an experimental and theoretical study on the fluid properties of which the emphasis is the water content of wells including the free and emulsive water, the viscosity-temperature characteristics and rheological properties of crude oil. Through the data of fluid high pressure properties, using relevant literature for reference, some more practical physical parameters of fluid such as oil viscosity were given, which constitute the basis for the subsequent study. Secondly, the paper investigated the flow patterns of the gas-liquid multiphase flow in the high pour point oil pumping wells and its transformation mechanism by an theoretical research, the corresponding three-dimensional flow pattern maps were then drawed according to the flow pattern transition equation, on which an essential analysis was maked. Finally, considering the Joule-Thomson coefficient and the effects of fluid convection heat transfer in the tubing-casing annulus, an integrative mathematical model was formulated to predict simultaneously the pressure and temperature distribution of multiphase fluid in the high pour point oil wells. Besides the model was implemented using iteration method and an application software was developed ralated to the model. Furthermore, the model was revised using field measured data and an actual calculation example was then given, of which the results shows that the proposed model has good performance, and could predict the pressure and temperature distribution excellently of multiphase fluid in the pumping wells producing high pour point oil.