Application of pressure build up analysis for reservoir oil

Abstract

The well analysed in this paper is A-1 well, T field, located approximately 90 km north of Bali. Reservoir in this field is gas reservoir with sandstone rock formation, one of the problems of A-1 well is sand problem. Due to the sand problem in well A-1, well test analysis must be done first, to see if there is any damage to the formation if the flow rate is increased. Identification of formation damage in a well can be done by doing Pressure Build up test. The method used is pressure build up test by Horner method with Sapphire software v.3.20. The determination of deliverability test was conducted by back pressure test. Given the results of the analysis, the permeability value remains, the value of the skin and reservoir pressure decreased. From the results of the tests, there were no significant changes, indicating no formation damage. The results of the deliverability tests decrease, due to decreased reservoir pressure. Since there is no formation damage, the flow rate can still be increased up to 30% of AOFP.