Injection of dilute brine and crude oil/brine/rock interactions

Tang, Guiqian; Morrow, Norman R.

doi:10.1029/129gm16

Cited by 27 publications

(17 citation statements)

References 13 publications

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“…The research work of Jadhunandan (1990) restated that injecting low salinity water into sandstone core samples can affect oil recovery. Extensive research works (Jadhunandan and Morrow, 1995;Yildiz and Morrow 1996;Tang and Morrow 1997;Tang and Morrow 1999;Tang and Morrow 2002;Zhang and Morrow 2006; have developed this idea into an emerged trend. The research efforts of Webb et al, (2005a), Lager et al, (2006), and Lager et al, (2007) have confirmed and validated the new trend through reservoir conditions coreflood experiments.…”

Section: Historical Backgroundmentioning

confidence: 99%

The Impact of the Injection Water Chemistry on Oil Recovery from Carbonate Reservoirs

2012

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Improved/enhanced oil recovery by tuning the ionic composition of the injection water is currently deemed as new emerging recovery method. In the recent years, extensive research on oil/brine/rock systems has shown that injection low salinity brines in sandstone reservoirs has a significant impact on the amount of oil recovered. Although, the potential for carbonates has not been thoroughly investigated, some reported studies have excluded carbonates from this effect. Based on the research work in the last years, we demonstrated in a previous reports (137634; SPEREE Journal, vol. 14(5), pp. 578-593, SPE 143550, SPE 141082) that substantial oil recovery beyond conventional waterflooding from carbonates can be achieved by optimizing the salinity and ionic composition of field injection brine. Also, research confirmed that the main cause for the substantial increase in oil recovery is wettability alteration of carbonate rock surface. This paper highlights extensive and a broad range of laboratory studies including wettability, surface chemistry, and zeta potential studies to define the role of water ions in the induced wettability alteration, which is crucial in determining the optimum composition of injection water for future field applications. The rock surface chemistry studies identified the potential mechanisms for wettability alteration triggered by injecting chemistry-optimized field injection water. The contact angle results confirmed that a sufficient reduction in the ionic strength of field injection water is required to trigger the effect of wettability alteration. Zeta potential measurements successfully addressed the impact of multivalent ions on rock surface charges. All evidence gathered during this research work indicates that interplay of water ions is important factor in this new recovery method.

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Section: Historical Backgroundmentioning

confidence: 99%

The Impact of the Injection Water Chemistry on Oil Recovery from Carbonate Reservoirs

2012

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“…Numerous laboratory coreflood studies have shown increased oil recovery is achieved by waterflooding using low salinity water, compared with injection of seawater or high salinity produced water. [1][2][3][4][5][6] Many of these academic studies were conducted using core material and crude oil from a BP North Sea reservoir. The increase in oil recovery for low salinity water injection from this North Sea reservoir ranged from 10 to 40%.…”

Section: Introductionmentioning

confidence: 99%

Low Salinity Oil Recovery: An Exciting New EOR Opportunity for Alaska's North Slope

McGuire¹,

Chatham²,

Paskvan³

et al. 2005

SPE Western Regional Meeting

522

214

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractLaboratory studies conducted over a period of many years have indicated that oil recovery could be improved by injecting lower salinity water (less than about 5,000 ppm). Although the recovery mechanisms are still uncertain, they appear to be similar to those found in alkaline flooding. Recent successful field trials have led to serious evaluation of field-scale implementation of low salinity EOR.

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“…Fines migration, where fines detach from pore walls under certain brine salinity and composition, polar components of oil attached to fines also detach along with fines improving water-wetness and oil recovery (Tang & Morrow, 1999;Tang & Morrow, 2002;Doust et al, 2009 These findings have led to further studies, such as, field tests, evaluation in secondary versus tertiary recovery mode, and combination of low salinity with surfactants and polymers (Kozaki, 2012).…”

Section: Low Salinity Brine Effects In Sandstonesmentioning

confidence: 99%

Wettability Alteration with Brine Composition in High Temperature Carbonate Reservoirs

Chandrasekhar

Mohanty

2013

SPE Annual Technical Conference and Exhibition

141

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The effect of brine ionic composition on oil recovery was studied for a limestone reservoir rock at a high temperature. Contact angle, imbibition, core flood and ion analysis were used to find the brines that improve oil recovery and the associated mechanisms. Contact angle experiments showed that modified seawater containing Mg2+ and SO42- and diluted seawater change aged oil-wet calcite plates to more water-wet conditions. Seawater with Ca2+, but without Mg2+ or SO42- was unsuccessful in changing calcite wettability. Modified seawater containing Mg2+ and SO42-, and diluted seawater spontaneously imbibe into the originally oil-wet limestone cores. Modified seawater containing extra SO42- and diluted seawater improve oil recovery from 40% OOIP (for formation brine waterflood) to about 80% OOIP in both secondary and tertiary modes. The residual oil saturation to modified brine injection is approximately 20%. Multi ion exchange and mineral dissolution are responsible for desorption of organic acid groups which lead to more water-wet conditions. Further research is needed for scale-up of these mechanisms from cores to reservoirs.

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Injection of dilute brine and crude oil/brine/rock interactions

Cited by 27 publications

References 13 publications

The Impact of the Injection Water Chemistry on Oil Recovery from Carbonate Reservoirs

The Impact of the Injection Water Chemistry on Oil Recovery from Carbonate Reservoirs

Low Salinity Oil Recovery: An Exciting New EOR Opportunity for Alaska's North Slope

Wettability Alteration with Brine Composition in High Temperature Carbonate Reservoirs

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