Numerical Simulation Of Heat Exchanger Process Of Super - Deep Heavy Oil Well

Heavy oil resources are rich in our country, but most of them are difficult to develop and the cost is high. With the progress of science and technology, heavy oil exploitation has good prospects. We often encounter this situation that heavy oil can flow in the formation, but not flow in the wellbore. To solve this problem, this paper bases on wellbore flow mechanism by searching a large number of domestic and foreign literatures. Ultra deep heavy oil Wells have been put as research objects, and the wellbore pressure and temperature coupling model been established. Considering the high cost of ultra heavy oil production by diluting light oil and the shortage of light oil resources in some heavy oil fields, and it is infeasible to lift ultra heavy oil by using heating technology, heating and blending diluting oil compound technology has been put forward in this paper.This paper mainly finished the following work:1) According to the heating or not, wellbore can be divided into two period(regular sections and heating sections). Based on Hagedorn-Brown pressure calculation method and Hasan-Kabir temperature calculation method, the regular sections of temperature and pressure coupling model has been established, and the calculation results have been compared with the field test results.2) Based on the basic principle of heat transfer, electric heating wellbore temperature model has been established. The main factors that influence the effect of electric heating have been analysed. It mainly includes length of heating, heating power, production rate and so on. In addition, the process design method is put forward.3) Based on the basic principle of heat transfer, flow circulation heating wellbore temperature model has been established. The main factors that influence the effect of flow circulation heating have been analysed. It mainly includes circulation depth, injection temperature, circulation rate, production rate and so on. In addition, the process design method is put forward.4) Based on the basic principle of heat transfer and Cragoe model, the reducing viscosity effect of light oil under different temperature has been studied. Light oil diluting wellbore temperature model has been established. The influence of light oil rate and injection temperature on wellbore temperature distribution has been studied.5) Taking theoretical studies into consideration, the project research of heating and blending diluting oil compound technology has been carried out. Through the study of flow law in wellbore and sensitivity analysis towards the light oil rate, heating power, injection temperature and cirlulation rate etc, this paper puts forward a method of heating and blending diluting oil compound design technology.Heating and blending diluting oil compound design technology can effectively solve the difficulty of ultra deep, ultra-heavy oil wells lifting in severe cold areas and alleviate the difficulty of heavy oil production in light oil resource scarcity areas. As domestic increasingly attention of heavy oil exploitation, the study of this paper has an important pratical significant to promote the exploitation of heavy oil resources.