Interpretation of Redondo Creek Field Pressure Buildup Tests

Recent pressure buildup analyses o f Redondo Creek F i e l d wells have been f a c i l i t a t e d by i den t i f i ca t i on o f wellbore storage. The w e l l bore storage coef f ic ient observed immediately a f t e r shut-in i s control led by the compressib i l i t y o f the two-phase wellbore f lu id , but the coef f ic ient decreases when the wellbore storage i s control led by a r i s i n g l i q u i d level. I den t i f i ca t i on o f such phenomena aids i n def i n ing the correct rad ia l f low regime o f the pressure buildup response.