就地生成二氧化碳提高采收率研究

Enhance oil recovery by in-situ carbon dioxide generation

对就地生成CO2技术的作用机理进行了研究,在油藏条件下,筛选出生成CO2的体系,同时进行原油膨胀和降粘效果评价;利用微观模型和物理模型研究了其驱油效果。实验结果表明,利用就地生成CO2技术能够生成充足的气体,膨胀原油体积及降低粘度,取得较好的驱油效果。当油藏温度为60℃、压力为10MPa、原油粘度为2010mPa·s时,就地生成的CO2可以使原油体积膨胀25%、粘度降低52.7%,能够提高采收率7.6～14.2个百分点。

This paper studies the mechanism of in-situ carbon dioxide generation,selects the system of CO2 generation,and evaluates the effects of crude oil expansion and viscosity reduction,and studies oil displacement efficiency with microscopic model and physical model.The experiment result indicates that the technology of in-situ carbon dioxide generation can produce sufficient gas to expand oil volume and reduce viscosity,and obtain efficient oil displacement creasrublotn.Udinodxeidr et hgee nceornadtiiotino ncsa no fe 6xp0a℃nd r eosile vrvooluirm tee mbyp e2r5a%tu,r er,e d1u0c Me vPias cporseistys ubrye 5a2n.d7 %20,1a0n dm iPma·prso voeil rveicsocvoesriyty f,a icnt-ors ibtuy 7.6% -14.2%.