Evaluation of the Effect of Water Salinity, Water Viscosity, and Injection Strategy on Heavy Oil Recovery and Carbon Dioxide Storage in the Forest Reserve Field, Trinidad

2018 ◽  
Author(s):  
Cassandra Dewan ◽  
Lorraine Sobers
Keyword(s):  
Carbon Dioxide ◽  
Oil Recovery ◽  
Heavy Oil ◽  
Water Salinity ◽  
Heavy Oil Recovery ◽  
Forest Reserve ◽  
Injection Strategy ◽  
Effect Of Water ◽  
Water Viscosity ◽  
Salinity Water

Enhancing Heavy-Oil-Recovery Efficiency by Combining Low-Salinity-Water and Polymer Flooding

SPE Journal ◽  
2020 ◽  
pp. 1-17
Author(s):  
Yang Zhao ◽  
Shize Yin ◽  
Randall S. Seright ◽  
Samson Ning ◽  
Yin Zhang ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Heavy Oil ◽  
High Salinity ◽  
Polymer Flooding ◽  
Heavy Oil Recovery ◽  
Sweep Efficiency ◽  
Low Salinity ◽  
Low Salinity Water ◽  
Salinity Water ◽  
Increased Oil Recovery

Summary Combining low-salinity-water (LSW) and polymer flooding was proposed to unlock the tremendous heavy-oil resources on the Alaska North Slope (ANS). The synergy of LSW and polymer flooding was demonstrated through coreflooding experiments at various conditions. The results indicate that the high-salinity polymer (HSP) (salinity = 27,500 ppm) requires nearly two-thirds more polymer than the low-salinity polymer (LSP) (salinity = 2,500 ppm) to achieve the target viscosity at the condition of this study. Additional oil was recovered from LSW flooding after extensive high-salinity-water (HSW) flooding [3 to 9% of original oil in place (OOIP)]. LSW flooding performed in secondary mode achieved higher recovery than that in tertiary mode. Also, the occurrence of water breakthrough can be delayed in the LSW flooding compared with the HSW flooding. Strikingly, after extensive LSW flooding and HSP flooding, incremental oil recovery (approximately 8% of OOIP) was still achieved by LSP flooding with the same viscosity as the HSP. The pH increase of the effluent during LSW/LSP flooding was significantly greater than that during HSW/HSP flooding, indicating the presence of the low-salinity effect (LSE). The residual-oil-saturation (Sor) reduction induced by the LSE in the area unswept during the LSW flooding (mainly smaller pores) would contribute to the increased oil recovery. LSP flooding performed directly after waterflooding recovered more incremental oil (approximately 10% of OOIP) compared with HSP flooding performed in the same scheme. Apart from the improved sweep efficiency by polymer, the low-salinity-induced Sor reduction also would contribute to the increased oil recovery by the LSP. A nearly 2-year pilot test in the Milne Point Field on the ANS has shown impressive success of the proposed hybrid enhanced-oil-recovery (EOR) process: water-cut reduction (70 to less than 15%), increasing oil rate, and no polymer breakthrough so far. This work has demonstrated the remarkable economical and technical benefits of combining LSW and polymer flooding in enhancing heavy-oil recovery.

Enhance Heavy Oil Recovery by In-Situ Carbon Dioxide Generation and Application in China Offshore Oilfield

2013 ◽  
Author(s):  
Xiaofei Jia ◽  
Kuiqian Ma ◽  
Yingxian Liu ◽  
Bin Liu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Oil Recovery ◽  
Heavy Oil ◽  
Heavy Oil Recovery

The effect of water alternating solvent based nanofluid flooding on heavy oil recovery in oil-wet porous media

Fuel ◽  
2020 ◽  
Vol 282 ◽  
pp. 118808 ◽  
Author(s):  
Sepideh Maaref ◽  
Apostolos Kantzas ◽  
Steven L. Bryant
Keyword(s):  
Porous Media ◽  
Oil Recovery ◽  
Heavy Oil ◽  
Heavy Oil Recovery ◽  
Effect Of Water
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