CO2吞吐技术在断块油藏的应用

CO2吞吐技术室内研究表明：将液态CO2注入油层,在地层温度下,CO2快速汽化混溶于原油,可降低原油粘度85．9％,从而增强原油流动能力;同时地下原油体积膨胀27．9％,使储集层孔隙压力升高,在局部形成饱和地带,使部分残余油被驱动,提高了油相渗透率,可使驱油效率提高7．5％,从而提高油藏的最终采收率。该技术对低渗、封闭未注水的复杂断块油藏比较适用。截至目前,已在孤岛采油厂实施11口油井,累积增油15410t,取得了较好的矿场试验效果,展示出CO2吞吐技术在断块油藏应用的光明前景。

The"Soak in and Soak out"of CO2 Flooding for Fault- Block Oil Reservoir

The laboratory test of "soak in and soak out"of CO 2 flooding shows: after the liquid CO 2 was injected into the reservoir and is miscible with the petroleum quickly under the underground temperature,the oil viscosity can be reduced by 85.9 percent,therefore,the flow ability of oil is increased.At the same time,the volume of the oil is expanded by 27.9 percent to increase the pore pressure of reservoir and produced saturated zone partially,so the partial remaining oil is stimulated and displacement efficiency of oil is increased by 7.5 precent.This techniqued is suitable to the low permeabile,enclosed and no flooded complex fault-block reservoir.11 oil wells are stimulated in Gudao Oilfield and increased oil production is 15 410t,showing bright prospect of CO 2 "soak in and soak out" technique for fault-block and low permeability reservoir.;