Investigation On Transportation Of Viscous Oil By Inputting Supercritical Carbon Dioxide

The viscosity of supercritical carbon dioxide is similar to the viscosity of gas. It is self-diffusion coefficient is about 100 times of liquid's, so supercritical carbon dioxide can permeate into the mixture easily. Therefore, in the transportation of viscous oil, some carbon dioxide is inputted into the viscous oil, which can mix with the viscous oil to a homogeneous phase easily in the critical condition. As a result, the viscosity of viscous oil can be cut down enormously. Finally, energy consumption drops.First, the viscosity-temperature characteristics and rheological characteristics of viscous oil have been researched. And then the mobility pattern of viscous oil has been stressly studied. The influence quantity of each flow parameter has been analyzed. According to the results, the dynamic viscosity of viscous oil is much greater than normal oil. The flowability of viscous oil is very terrible. After carbon dioxide is imputed into the viscous oil, the dynamic viscosity of viscous oil is readily reduced. Temperature,pressure and gas/oil ratio all have great influence on the flowability of viscous oil. Along with the rising of temperature, the flowability of viscous oil has exponential declined; And the dynamic viscosity of viscous oil decreases sharply along with rising of gas/oil ratio, but when the gas/oil ratio is greater than 20, the curve of gas/oil ratio -dynamic viscosity becomes a little smooth; The greater the transporting pressure is, the deeper the extent of the supercritical carbon dioxide- viscous oil miscible phase is. However, excessive syste??essure maybe have an objectionable influence on the dynamic viscosity of viscous oil. Finally, we have obtained conclusion that the preferable operational condition in this experimentation is: P=20MPa, T=90℃, n=20.In addition, the advantage and disadvantage of transporting viscous oil by inputting supercritical carbon dioxide technological process are detailed introduced. Afterwards, the disadvantage of available experimental apparatus and the highlight of future research have been pointed out.