| Title | AN AUTOMATED WELL TEST ANALYSIS SYSTEM (AWTAS) |
|---|---|
| Authors | M.J. O'Sullivan, A.E. Croucher, J.A. Newson, E.B. Anderson, A. Hochwimmer, S. Yamazawa and S. Lin |
| Year | 2000 |
| Conference | Stanford Geothermal Workshop |
| Keywords | well test analysis |
| Abstract | Systems developed in the past for the computerised analysis of well tests are based on mathematical models of the reservoir that can be solved using analytical methods. Unfortunately, for many geothermal well tests the flows are non-isothermal and often involve phase changes. This means that the corresponding mathematical models cannot be solved analytically and traditional methods of well test analysis, either manual or computerised, do not work very well. In the system discussed here, instead of analytical techniques very fast numerical methods are used to solve the reservoir models. These fast solvers are linked to an optimiser, which carries out the model fitting task. The system includes a range of possible reservoir models such as uniform porous medium and double porosity medium, and can handle any fluid conditions ranging from warm water to two-phase mixtures of water and steam or dry steam. |