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The Piper Field, Block 15/17, UK North Sea

Abstract The Piper Field is located in Block 15/17 and was discovered in 1972 by the 15/17–1A well, which tested 37° API oil from the Late Jurassic Piper Formation. The field is situated on a shelf on the northern margin of the Witch Ground Graben and comprises four tilted fault blocks dipping gently to the northeast away from the graben. The trap is formed by a combination of dip and fault closure. The reservoir comprises sandstones of the paralic Sgiath Formation and the shallow-marine wave-dominated deltaic Piper Formation. The original productive area of the field was 7350 acres with a maximum oil column of 1210 ft, containing approximately 1400 MMBBL STOIIP. Following cumulative production of 834 MMBBL, a productive area of 2500 acres remains. Ultimate recovery of approximately 70% of STOIIP is forecast, with estimated remaining reserves of 118 MMBBL. Hitherto, production has been through a fixed 36-slot platform which at the time of the platform explosion had 27 producing wells and 8 injectors. Production averaged over 250 000 BOPD for the first three years of the field's life and was reduced to approximately 200000 BOPD in 1980 to improve reservoir management and ultimate recovery. Production had declined to about 120000 BOPD by July 1988, water-injection rates having reached an average of 260 000BPD.