Hu Ruien, Crawshaw John
Chemical Engineering Department, Imperial College London, Qatar Carbonate and Carbon Storage Research Centre.
Chemical Engineering Department, Imperial College London, Qatar Carbonate and Carbon Storage Research Centre;
J Vis Exp. 2017 Jun 6(124):55749. doi: 10.3791/55749.
A rheometer system to measure the rheology of crude oil in equilibrium with carbon dioxide (CO2) at high temperatures and pressures is described. The system comprises a high-pressure rheometer which is connected to a circulation loop. The rheometer has a rotational flow-through measurement cell with two alternative geometries: coaxial cylinder and double gap. The circulation loop contains a mixer, to bring the crude oil sample into equilibrium with CO2, and a gear pump that transports the mixture from the mixer to the rheometer and recycles it back to the mixer. The CO2 and crude oil are brought to equilibrium by stirring and circulation and the rheology of the saturated mixture is measured by the rheometer. The system is used to measure the rheological properties of Zuata crude oil (and its toluene dilution) in equilibrium with CO2 at elevated pressures up to 220 bar and a temperature of 50 °C. The results show that CO2 addition changes the oil rheology significantly, initially reducing the viscosity as the CO2 pressure is increased and then increasing the viscosity above a threshold pressure. The non-Newtonian response of the crude is also seen to change with the addition of CO2.
描述了一种用于在高温高压下测量与二氧化碳（CO₂）处于平衡状态的原油流变学的流变仪系统。该系统包括一个连接到循环回路的高压流变仪。流变仪具有一个旋转流通测量池，有两种可选几何形状：同轴圆筒和双间隙。循环回路包含一个混合器，用于使原油样品与CO₂达到平衡，以及一个齿轮泵，该齿轮泵将混合物从混合器输送到流变仪并将其再循环回混合器。通过搅拌和循环使CO₂和原油达到平衡，并用流变仪测量饱和混合物的流变学。该系统用于在高达220巴的高压和50°C的温度下测量与CO₂处于平衡状态的祖阿塔原油（及其甲苯稀释液）的流变特性。结果表明，添加CO₂会显著改变油的流变学，最初随着CO₂压力的增加粘度降低，然后在超过阈值压力时粘度增加。还可以看到原油的非牛顿响应随着CO₂的添加而变化。
