An Investigation into Energy Modelling of Gas ReservoirsHayden Moriaty
Australian School of Petroleum
University of Adelaide
Temperature logs can give us some interesting insights into reservoir characteristics as they are used qualitatively to determine flow regimes, gas or water entry into a well, evaluation of cement quality and detection of lost circulation zones. The use of temperature logs for qualitative petrophysical analysis has been due to the lack understanding and applicability of current energy modelling used in the oil & gas industry.
Many energy models within the literature do not often take into account the Joule Thomson (JT) effect, such as viscous dissipation, and heat loss to the adjacent strata. These parameters were found to be significant reasons why the sand face temperature is different to the geothermal temperature gradient. In the near wellbore region the difference between the two will become more pronounced due to skin damage. By better understanding the effect which the damaged zone has on temperature readings, some new information may be inferred.
This project focussed on researching energy balances to determine whether a connection could be made between temperature logging data and the radius of damage, the skin factor and reservoir pressure data. Several different energy balance equations were researched and a robust model was generated. This model was derived for steady state and transient well conditions.