Naizhen Liu* | Qingchun Gao
OPEN ACCESS
Aerated fluids drilling has been widely used when drilling conventional oil wells, unconventional gas well and geothermal wells for many reasons. The main reason to use aerated fluids is that the technique can minimize circulation losses and prevent the formation from damaging. This paper studied the temperature distribution of oil well with high temperature, when the wells were drilled with aerated fluids and circulation losses occurred at the same time. A coupled wellbore flow model was developed considering the interaction between pressure distribution and temperature distribution. Then the temperature distribution was solved using MATLAB Software accounting for the transient heat transfer because of aerated fluids leakage into the reservoir. The simulation result shows that compared with the temperature prediction model assuming no gas compressibility, the temperature distribution model considering gas compressibility can fit field data better and the new model can predict the temperature distribution of aerated fluids with circulation losses well. When gases injected into the well increased, the temperature in the annulus at the wellhead increased at the same time, but the temperature at the bottom showed the opposite phenomenon. The increment of circulation losses will reduce the temperature of aerated fluids, but the effect is not much.
aerated fluids, circulation losses, oil well, temperature prediction
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