Patent ID: 11892592
Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  E | IPC E  G

Claim 10:
11. A computer programmed to perform a method that includes:
identifying input parameters of a model of pressure transient in a discretely fractured reservoir to which the pressure transient output of the model is sensitive;
determining sensitivity indices of the input parameters via a global sensitivity analysis comprising:
(i) calculating global sensitivity indices for the input parameters of the model;
(ii) identifying which of the input parameters contribute most to expected uncertainty in pressure and pressure derivative output of the model; and
(iii) determining how contributions of the input parameters to the expected uncertainty vary over a time period comprising a plurality of time ranges;
generating a ranking of the input parameters according to their respective contributions to variance in output of the model, wherein generating the ranking of the input parameters includes generating a time-dependent ranking of the input parameters according to their respective contributions to variance in the output of the model;
selecting a testing period corresponding to a time range of the plurality of time ranges to use in performing a well test that is based on relative sensitivity of a highest ranked input parameter of the input parameters being high relative to sensitivities of any remaining input parameters such that that the highest ranked input parameter provides a greatest contribution to the expected uncertainty in pressure and pressure derivative output of the model during the selected testing period; and
updating the model based on generated results of a pressure transient well test performed utilizing the selected testing period.