An Evaluation of IOR Potential for the Norne Field’s E-Segment using Low Salinity Water Injection
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The objective of this master thesis is to evaluate the IOR potential for the NorneField’s E-segment using low salinity water injection. Sea water/high salinity waterwas injected into this formation in the past. The Norne Field’s E-Segment has produced about 40% of the oil in place so far afteremploying the combination of primary and sea water flooding as a secondary recovery technique for a period of 7 years of production (i.e. from 6 November 1997 to 1 December 2004). There is about 60% oil is still trapped as residual oil especially in the Ile and Tofte formations which take hold of about 80% of oil in the reservoir. The oil trapped as a result of high capillary action of water which keeps this oil immobile. Low salinity water injection could be an effective recovery mechanism to extract this residual oil from the reservoir. For the modeling of low salinity water injection for the Norne Field’s E-Segment, low salinity water is injected from 1 January 2005 as tertiary recovery method using ECLIPSE 100 reservoir simulator and the simulation is ended on 1 December 2022.Simulation studies using the original wells shown that low salinity water injection with optimal concentration of salinity 1,000 ppm TDS (Total Dissolved Salts) or 1.0kg/m3 revealed substantially higher oil production (34.13 MSCM) compared to seawater/high salinity water injection (32.95 MSCM). Having found that the low salinity water injection is an effective IOR technique for the Norne Field’s E-Segment, the next job was to find the different ways to extractmore oil using low salinity water injection. For extracting more oil there are six significant different simulations have been run using different well configurations including base case such as; (1) Base case/sea water injection using the existing or the original wells (i.e. twoinjectors: F-1H & F-3H and two producers: E-2H & E-3AH), (2) Low salinity water injection using the original wells, (3) Low salinity water injection using the original wells in addition to a new producing well PROD-1H, (4) Low salinity water injection using the original wells in addition to recompleted producing well E-3AH, (5) Low salinity water injection using the original wells in addition to a new injection wellINJ-1H, and (6) Low salinity water injection using the original wells in addition to recompleted injection well F-3H.