A Temperature Well Test Analysis Method Considering Variable Thermal Storage Effect

Temperature well test is an important method to obtain reservoir thermodynamic parameters. Reservoir parameters evaluation can be achieved by monitoring bottomhole temperature data and conducting temperature data interpretation to understand the dynamic changes of the reservoir. The phenomenon of "variable well storage" often appears in the early stage of the field measured temperature well test curve so that conventional temperature well test models are often difficult to be widely used because of the poor model data fitting effect. Therefore, in order to ensure the reliability of matching interpretation of early temperature data, a temperature test model of variable thermal storage effect was established by introducing a temperature correction function into wellbore boundary conditions. The solution is solved analytically by Laplace transform. The temperature well test curve chart is drawn. Temperature difference and derivative of temperature difference logarithmic curve have obvious "concave" or "cross" characteristics in the early stage. The curve fitting effect and the accuracy of interpretation results could be improved by using the improved model to fit and analyze the temperature data of an oil field example well. This method provides a reference for the early stage interpretation of temperature well test curve.