An experimental study on rheological property and influential factors of foamy oils
LU Teng1, LI Zhaomin1, LI Songyan1, LIU Shangqi2, WANG Chunzhi1
1. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China;
2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
An experimental device for testing rheological property of foamy oils was developed based on the experimental system for testing rheological properties of conventional oils. This experimental device can achieve measurements on rheological properties of foamy oils and dynamic observation of foamy-oil microstructures under different experimental conditions. The device is composed of foamy oil generation system, testing system of rheological properties and image acquisition system. It can be seen from foamy oil pictures that gas bubbles are highly dispersed in the oil, forming a stably flowing state of foamy oils. A mean equivalent diameter of gas bubbles in foamy oils under different pressures can be obtained through image processing and average volume weight. Analyses on influential factors of the foamy oil viscosity indicated that the effect of bubble size on the foamy oil viscosity increases gradually with the increase of the mean equivalent diameter of bubbles. A correlation between the foamy-oil or live-oil viscosity and foam quality was established and it showed that the foamy oil viscosity has an approximately linear relationship with foam quality. The viscosity of foamy oils decreases gradually with the increase of shearing rate, showing an obvious shear-thinning characteristic. A correlation between the foamy-oil flow behavior index and foam quality was established as well and it showed that the foamy-oil flow behavior index decreases with the increase of foam quality, i.e. the non-Newtonian viscosity behavior of foamy oils is stronger than that of live oils.
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