| Popis: |
This study provides a quick method to estimate the orientations of permeability/flow anisotropy from pressure interference responses only. The method can identify a 90-degree range of the anisotropy orientation from two observation-well responses and a range approximately 45-degree (or less under favorable conditions) from three observation-well responses. Formal analysis (such as type-curve or simulation matching) and information of reservoir-fluid properties are not required.Significances of the developed method are: (1) It provides solution bound that contains the unique solution (if exists). (2) It may be the only solution obtainable if the adopted formal method (such as Papadopulos-Ramey procedure) fails (which is not known a priori). (3) It provides the most desirable information, namely, the anisotropy orientation, from a timeconsuming and expensive (e.g., lost production) interference test. (4) It can be implemented for two observation wells.The validity of the developed method is demonstrated by one ideal and two field examples. We strongly recommend the developed method as part of "diagnosis" prior to any formal interference-testing analysis. |
