鲁克沁油田原油流变性研究

THE STUDY ON THE RHEOLOGICAL CHARACTERISTIC OF THE CRUDE OIL IN LUKEQIN OILFIELD

重质高粘原油一般表现为非线性渗流特点 ,其流变性物理实验研究对指导油藏的开发具有重要意义。鲁克沁油田重质高粘原油流变性实验研究结果表明 ,该区脱气原油粘滞性较强 ,温度由低逐渐升高时 ,流体性质由塑性体向假塑性体和牛顿流体型过渡 ,当温度接近油层温度 ( 67℃ )以上时 ,非线性渗流性不显著 ,基本为牛顿流体 ;油层温度高于粘温曲线拐点( 5 8℃ ) ,具有一定的流动能力 ,只要控制合适的注水速度 ,就可充分的利用地层热能 。

The heavy and high viscous crude oil commonly has nonlinear flow characteristic through porous medium, physical experimental study of the rheological characteristic has significant guidance meaning to reservoir development. physical experiment on the rheological characteristic of the heavy and high viscous crude oil in Lukeqin oilfield shows that the degassing crude oil has strong viscous nature in this region. While the temperature rises gradually, the fluid character changes from plastic fluid to pseudoplastic fluid; when the temperature is over the oil layer temperature (67℃), the nonliner flow characteristic through porous medium is not remarkable, and the fluid is Newton fluid basically; and when the oil layer temperature is above viscosity-temperature curve inflexion (58℃), the fluid has definite flow capability. Therefore, if the injection velocity is controlled properly, the stratum heat energy could be utilized well and the reservoir can be waterflooded in the normal temperature.