Petruniak V. Improving methods of hydrodynamic well testing results interpretation from pressure build-up curves

The dissertation deals with accuracy improvement in evaluation of storage and flowing properties of productive reservoirs from the hydrodynamic well testing results using pressure build-up (PBU) curves. It has reviewed the current status of interpretation methods applicable to hydrodynamic testing of productive reservoirs from PBU curves. It has tagged their drawbacks which concern the justification of reservoir simulation model and generation of parameter estimates including those in the situation of information uncertainty. With the information on measuring equipment accuracy available taken into account, interpretation methods applicable to hydrodynamic well testing from PBU have improved concerning a selection of the most adequate reservoir model from some class of simulation models by the criterion of the maximum likelihood function. Estimating the flowing parameters of some reservoir system involves likelihood function criterion and criteria based on the properties of the matrix covariance of estimates. PBU interpretation algorithms have been developed for oil and gas reservoirs and tested in the field conditions in order to evaluate the efficiency of process-oriented actions in wells and refine or adjust hydrocarbon reserves estimates.