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Enhancing heavy oil recovery with hot water flooding by adding nitrogen and surfactant

YUAN Shi-yi 1 LIU Shang-qi 1 ZHANG Yi-tang 1 ZHANG Shi-min 2 ZHAO Guo?-ping 1 (1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China; 2.Liaohe Oil Field Company,PetroChina,Panjing 124010,China)  
The production mechanism for enhancing recovery of depleted heavy oil reservoir with hot water flooding by adding nitrogen and surfactant was investigated.The operating parameters were optimized,by means of numerical simulation and laboratory experiment.The reasonable operating parameters include hot water injection rate,surfactant concentration,nitrogen-to?-liquid ratio,injection scheme and the size of slug.Based on the results of laboratory test and simulation,the recovery performances were predicted,according to the relevant of reservoir characteristics and development status of J90 Block.A field pilot test project was designed and implemented to evaluate the effectiveness of hot water flooding by adding nitrogen and surfactant,after steam simulation in a reservoir with a nine-spot pattern at J90 Block of Liaohe Oilfield.The pilot test showed good recovery performances of this method.Currently,the field test has been extended to nine patterns.It is predicted that this technology may become an effective recovery process following steam stimulation for this type of heavy oil reservoirs.
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