Optimization of Spore Forming Bacteria Flooding for Enhanced Oil Recovery in North Sea Chalk Reservoir

Amalia Yunita Halim, Sidsel Marie Nielsen, Anna Eliasson Lantz, Alexander Shapiro

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Abstract

Little has been done to study microbial enhanced oil recovery (MEOR) in chalk reservoirs. The present study focused on core flooding experiments to see microbial plugging and its effect on oil recovery. A pressure tapped core holder with pressure ports at 1.2 cm, 3.8 cm, and 6.3 cm from the inlet was used for this purpose. A spore forming bacterium, Bacillus licheniformis 421, was used as it was shown to be a good candidate in the previous study. Bacterial spore can penetrate deeper into the chalk rock, squeezing through the pore throats. Our results show that B. licheniformis 421 when injected as a secondary technique can recover 4% more of the original oil in place (OOIP) as compared with the seawater flooding. Furthermore, when applied as tertiary technique it can recover 1.4% OOIP of the residual oil. The effective permeability decreased in the first two sections of the core (0-1.2 cm and 1.2-3.8 cm) during bacteria injection. Further seawater flooding after three days shut in period showed that permeability gradually increased in the first two sections of the core and started to decrease in the third section of the core (3.8-6.3 cm). Complete plugging was never observed in our experiments.
Original languageEnglish
Title of host publication20th RMF Conference Proceeding
Number of pages1
Publication date2015
Publication statusPublished - 2015
Event20th Reservoir Microbiology Forum (RMF2014) - ICO Conference Centre, London, United Kingdom
Duration: 18 Nov 201419 Nov 2014

Conference

Conference20th Reservoir Microbiology Forum (RMF2014)
LocationICO Conference Centre
CountryUnited Kingdom
CityLondon
Period18/11/201419/11/2014

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