稠油油藏多元热流体吞吐油藏参数界限研究

多元热流体为蒸汽、氮气、二氧化碳的高温高压混合气体,具有降低原油黏度,提高地层压力,改善油藏剖面,提高稠油油藏开发效果等作用。为研究适合多元热流体吞吐的稠油油藏条件,通过数值模拟方法,定量研究了地质流体参数对稠油油藏注多元热流体吞吐效果的影响程度,影响程度强弱确定了各参数界限。结果表明:高强度影响因素原油黏度应该低于6 000 mPa·s,有效厚度大于3～11 m,中强度影响因素剩余油饱和度应该大于0.45～0.65,渗透率大于130×10~(-3)～1 000×10~(-3)μm~2,低强度影响因素纯总比应该大于0.42,孔隙度大于0.20,油藏深度超过300 m。研究结果为稠油油藏多元热流体吞吐高效开发提供技术依据。

Research on Reservoir Parameters Limit of Multicomponent Thermal Fluid Stimulation in Heavy Oil Reservoir

Due to high viscosity and large flow resistance, the recovery ratio is small and the development effect is unsatisfied for conventional steam injection in heavy oil reservoir though the cost of is high. Multicomponent thermal fluid is a high temperature and high pressure gas mixture of steam, N2 and CO2, it can reduce the oil viscosity, increase the reservoir pressure, improve the reservoir profile and the development effect. In this paper the impact of geological-fluid parameters on multicomponent thermal fluid stimulation is studied quantitatively in heavy oil reservoir, the orders of influence degrees of each parameter are ranked as the primary and secondary grades, the parameters limits are proposed combined with the economic evaluation result, finally technical support of efficient multicomponent thermal fluid stimulation in heavy oil reservoir is present.