基于分形理论的裂缝稠油油藏蒸汽驱温度分布计算

 针对裂缝稠油油藏注入蒸汽的情况，研究热蒸汽对裂缝性地层的加热过程。通过引入分形理论表征裂缝的发育和分布情况，推导了裂缝的体积系数和裂缝储层的等效渗透率，考虑天然裂缝存在对稠油热采的渗流能力和传热机制的影响，结合能量平衡方程和渗流方程，求得裂缝稠油油藏蒸汽驱的温度分布的解析解。分析注气时间和裂缝参数对蒸汽驱加热范围的影响，发现裂缝分形维数比迂曲分形维数对加热范围有更大影响，说明分支裂缝的密度比分支裂缝的迂曲度对加热范围的影响更加明显。

Heating Distribution Calculation of Steam Flooding in Fractured Heavy Oil Reservoir Based on Fractal Theory

The research of heating distribution in the steam flooding process in a fractured heavy oil reservoir is rare; this paper focuses on the hot steam injection into a fractured heavy oil reservoir and studies the heating process of the oil reservoir. Fractal theory is introduced to characterize the development and distribution of cracks. Fracture volume fraction and effective permeability are derived, which significantly affect the seepage capability and the heat-transfer mechanism. Combined with the energy balance equation and the seepage motion equation, an analytical solution to heating distribution is obtained for steam flooding in a fractured heavy oil reservoir. The effects of the steam injection time and cracks parameters on the steam flooding are analyzed. The results show that the fractal dimension can more obviously affect the heating range compared to the circuity fractal dimension. It is indicated that the density of the branching cracks is more important than the circuity form of the cracks.