就地CO_2技术油藏条件下性能评价

Performance evaluation of in—situ generation of carbon dioxide under reservoir conditions

就地CO_2技术是一种提高原油采收率的有效手段,在油藏条件下,通过实验,对就地CO_2技术的性能(原油膨胀能力、原油降粘能力、结垢、地层伤害)以及驱油效率进行了评价。实验结果表明,在油藏条件下,就地CO_2技术具有良好的膨胀原油体积、降低原油粘度能力,并且具有良好的驱油效果。当原油粘度为12904．1 mPa·s,温度70℃,压力6 MPa时,就地CO_2技术可以使原油体积膨胀32．5%;可以使原油粘度降低52．69%,能够提高原油采收率6．40%～17．06%。就地CO_2技术对地层不会造成伤害。

The technique of in-situ generation of carbon diox- ide is a new effective method to enhance oil recovery. Through experiments,this paper has made a performance evaluation on the capability of in-situ generation of car- bon dioxide,which includes expansion,viscosity reduc- tion,scale formation,injury and so on.The results indi- cate that the in-situ generation of carbon dioxide has good expansion efficiency,favorable viscosity reduction efficiency and great displacement efficiency.When the viscosity of oil is 12904.1 mPa·s,the temperature is 70℃,the pressure is 6 MPa.With this technique,oil volume can be expanded by 32.5%,the viscosity can be reduced by 52.69% and oil recovery can he enhanced by 6.4%-17.06%.Besides that,this technology has no harm to the formation.