相对低/高渗区对SAGD传热传质影响数值模拟研究

为了研究相对低/高渗透区对SAGD传热传质的影响，针对六种常见的渗透率分布模式，利用油藏数值模拟方法建立SAGD数值模型，并对比分析了蒸汽腔发育和含油饱和度变化特征。结果表明：当平面方向相对低渗区物性一定时，其距离SAGD井对越近，对该侧蒸汽腔和泄油区域侧向扩展的抑制作用就越强，SAGD传热传质非对称性越明显；平面方向相对高渗区的存在对该侧蒸汽腔和泄油区域侧向扩展具有促进作用，且相对高渗区距离SAGD井对越远，促进作用就越小，SAGD传热传质非对称性程度也越弱；从整体上来看，当垂直方向相对低渗区靠近SAGD井对时，它对整个蒸汽腔发育起抑制作用，而当它远离SAGD井对时，反而会加速蒸汽腔侧向和向下发育。

Numerical investigation of relative low/high-permeability zone on heat and mass transfer in SAGD process

To study the effects of relative low/high-permeability zone on heat and mass transfer in SAGD process, aimed at six common permeability-distribution modes, numerical reservoir simulation method is applied to establish SAGD models, and steam chamber development and oil saturation change in the SAGD process are analyzed. The results indicate that when the properties of relative low-permeability zone in horizontal direction are constant, the shorter the distance between SAGD well pairs and the relative low-permeability zone is, the greater the inhibition effects on the lateral development of steam chamber and on the lateral expanding of oil-drainage area are, and the higher the degrees of asymmetry of heat and mass transfer in the SAGD process are. In addition, a relative high-permeability zone in horizontal direction can promote the lateral expanding of steam chamber and oil-drainage area, and the longer the distance between the SAGD well pairs and the relative high-permeability zone is, the smaller the promotion effects are, and the lower the degrees of asymmetry of heat and mass transfer in the SAGD process are. Finally, the paper shows that from the perspective of the overall, when the relative low-permeability zone in vertical direction is close to the SAGD well pairs, it inhibits the entire development of steam chamber, but when it is away from the SAGD well pairs, it can accelerate the lateral spreading and downward moving of steam chamber in the SAGD process.