注水井合理地层保持温度和注入水温度的确定

The determining of reasonable formation keeping temperature and injection water temperature of water-injection wells

针对多数注水开发油田,由于注入水温度较低,随着注水量的增多,油层温度不断下降,从而造成油水粘度升高,影响水驱油的效果,因此,确定合理的注入水温度显得至关重要。根据实验测得的粘温特性曲线,引用经验公式转换为地下情况的粘温特性曲线,曲线趋于平缓处的温度即为合理的地层保持温度。引用Ramcy的热传导方程,可以得出在不同注入水温度情况下,不同注水量的注水井井底温度与时间的变化关系曲线,由注水井的配注量和地层合理的保持温度可以确定合理的注入水温度。

For the majority of water-injection oilfields, due to the low water-injection tem- peratures, along with the increasing of water-injection volumes, the temperatures of reser- voirs will decline that makes the oil-water viscosity increase, influencing the effect of water flooding, therefore, it is crucial to determine the reasonable injection water temperature. We can translate the curve of viscosity-temperature characteristic which are measured by the ex- periment into viscosity-temperature characteristic curve of underground circumstance by the experienced formula, the temperature of the flattening place of the curve is the reasonable formation temperature. Referencing Ramey＇s heat conduction equation, we can obtain the curves which inflect the changing relation of the well bottom temperatures of different water injection volumes and times, then we can determine the reasonable water-injection tempera- ture according to the allocated injection volume of the water-injection well and the reason- able keeping temperature of the formation.