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高含水原油的视粘度是温度、含水率以 及剪切速率的函数。从现场实际出发 全面研究高含水原油流变特性,即含水原油视粘度与含水率的关系,含水原油视粘度与剪切速率的关系,含水原油视粘度与油温的关系等。给出了测试的相应曲线并对曲 线进行了分析。该油田油水乳状液转 相点在含水65 .2 % 左右,在转相点以前是以油为外相,水为内相 W/ O 型乳状液,视粘度随含水量上 升而增加,且受温度影响较大,同时剪切速率影响也相当明 显。随着剪 切速率的增加,转相点的视 粘度明显下降。用曲面拟合方法回归出流变参数方程。通过现场取样和数据处理分析可知,含水原油其流变特性可由幂律本构方程表示。这一结论为准确计算高含水原油管道工艺参数奠定基础。
The apparent viscosity of a high-water-content crude oil is a function of temperature, moisture content, and shear rate. Based on the actual situation in the field, the rheological properties of crude oil with high water cut were comprehensively studied, that is, the relationship between the apparent viscosity of water-containing crude oil and water cut, the relationship between apparent viscosity and shear rate of crude oil, the apparent viscosity of oil-bearing crude oil and oil temperature. The corresponding curve of the test is given and the curve is analyzed. The oil-in-water emulsion in the oil field has a water-swirling point of 65. About 2%, before the phase transition point is the oil as the external phase, water as the internal phase W / O emulsion, depending on the viscosity increases with the increase of water content, and more affected by temperature, while the shear rate of the impact is quite obvious . As the shear rate increases, the apparent viscosity of the phase transition point decreases significantly. Regress rheological parameter equation by surface fitting method. Through the field sampling and data processing analysis shows that the rheological properties of crude oil can be expressed by the power law constitutive equation. This conclusion lays the foundation for accurately calculating the process parameters of high-water-content crude oil pipeline.