Between 1985 and mid-1993 estimates of STOUP in the Rob Roy Field varied from 89 mmbbls to 110 mmbbls. In 1993 three well workovers resulted in a significant increase in dry oil production from the field. This increased production could not be history matched to the existing simulation model of the field.
This paper summarises the subsequent geoscience and engineering work which has led to a new STOIIP estimate of 143 mmbbls, a significant revision of the field reservoir simulation model, and a substantial increase in estimated oil reserves. These were achieved principally by a reinterpretation of the same geophysical dataset that was available at the time of the Annex B in 1985.