PRESSURE TRANSIENT ANALYSIS IN HORIZONTAL WELLS IN SOME SOLE PIT AREAFIELDS, UK

This paper presents a discussion and interpretation of a variety of tr ansient pressure responses observed in nine flow and buildup surveys p erformed in horizontal wells in the Sole Pit area fields Barque and Cl ipper. Horizontal well pressure transient flow regimes and signatures associated with heterogeneous reservoirs are observed in the survey lo g-log pressure derivatives. The signatures show considerable variabili ty and emphasize the strongly heterogeneous nature of the reservoirs. Rapidly declining transmissibilities in the vicinity of the wellbore a re observed in two surveys, while other survey log-log derivative resp onses suggest a dual-porosity characteristic followed by horizontal we ll intermediate-time linear flow. Pressure transient testing contribut es to an understanding of the reservoir behavior by revealing essentia l characteristics of a flow model that can describe flow in the hetero geneous, fractured sandstone.