An energy saving and emission reduction mode for intermittent steam injection assisted gravity drainage of ultra heavy oil
The development process of Steam Assisted Gravity Drainage(SAGD)for ultra heavy oil requires a large amount of steam consumption and carbon dioxide generation,and it is urgent to combine green electricity to achieve clean substitution.However,green electricity is often greatly affected by external weather in terms of output,so it has intermittent output characteristics.In order to study the impact of intermittent steam injection on SAGD production,a numerical mechanism model for SAGD reservoir development was established,and the operation process of intermittent steam injection was simulated.The temperature and phase change characteristics of the SAGD steam chamber under extreme operating conditions of intermittent steam injection shutdown were analyzed,and the intermittent steam injection operation mode was verified through on-site experiments of 30 well groups.The optimal timing and shutdown time limit for intermittent steam injection operation were proposed.Research has shown that intermittent steam injection operations are carried out when the recovery degree is greater than 30%.The SAGD well group not only produces stable oil but also has a certain increase in production effect.However,it is recommended that the steam stop time should not exceed 30 days.The on-site test results show that selecting wells with 80%water content for intermittent steam injection can ensure the best results.
ultra heavy oilhorizontal wellenergy conservation and emission reductionSAGDintermittent steam injectionsteam chamber
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