Application of thermotolerant petroleum microbes at reservoir conditions for enhanced oil recovery

Primary oil recovery is the first stage of hydrocarbon production in which a reservoir uses its natural energy to force wellbore. Secondary comes play when hydrocarbons can no longer be further produced by means. The purpose secondary maintain pressure so as displace toward Both primary and processes cannot more than 50% available reservoir. remaining are recovered through Tertiary/Enhanced Oil Recovery techniques. According literature, microbial enhanced has been identified tertiary method used improve efficiency from reservoirs. Microbial feasible technology, not widely gas industry owing attainment requisite conditions such temperature within microbes thrive. Literature shown that thermotolerant withstand optimum temperatures 50–90°C, while deep ultra-deep often above 100°C. This study identifies some isolated sandstone high 110°C via conventional methods molecular analysis. petroleum microbes: Bacillus amyloliquefaciens (A) nealsonii (B) were enhance results showed species A B at confined 3.0 MPa 27°C, gave 46.4% 48.6% recoveries, respectively, comparably higher value (26.9%) obtained for water flooded samples. At 80, 90, 100, 110 120°C, show factor (55.2–64.1%) compared range (46.7–57.5%) recorded A. onset core flooding experiments, there was an initial increment increased 80 110°C, whereas, it remained constant 110–120°C. trend coincides with drop thermal resistance exhibited exposed conditions. cumulative commercial Eclipse simulation closely matched those experiment results, slight difference attributed adjustment input parameters. experimental