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蒸汽辅助重力泄油(SAGD)是开采特超稠油油藏的一项前沿技术,经典的SAGD Butler产能模型假设油藏各向同性,导致产能计算结果较实际值偏高,无法应用于各向异性稠油油藏。该文通过分析各向异性油藏渗透率的方向性,得出了压力梯度和渗流速度2个方向的渗透率,将2个方向渗透率模型分别代入Butler产能公式,得出了2种适用于各向异性稠油油藏的SAGD产能半解析公式,并通过数值方法进行了求解。结果表明:方向渗透率的压力梯度和渗流速度模型能够方便地应用于各向异性油藏产能公式;油藏各向异性会降低SAGD水平扩展阶段产能,并且该阶段产能随着蒸汽腔向泄油边界的扩展逐渐增大,随着生产时间的推移逐渐接近各向同性情形。
Steam Assisted Gravity Drainage (SAGD) is a leading technology in the production of extra-heavy oil reservoirs. The classical SAGD Butler production model assumes that the reservoir is isotropic, resulting in a higher capacity calculation than the actual value and can not be applied in all directions Heterosexual heavy oil reservoir. In this paper, permeability of two directions of pressure gradient and seepage velocity is obtained by analyzing the directivity of anisotropy reservoir permeability. The two directional permeability models are respectively substituted into Butler’s productivity formula, and two kinds of formulas suitable for Anisotropic heavy oil reservoir SAGD production semi-analytical formula, and solved by numerical methods. The results show that the pressure gradient and seepage velocity model of directional permeability can be easily applied to the anisotropic reservoir productivity formula. Reservoir anisotropy will reduce the production capacity of SAGD horizontal expansion stage, Boundary expansion gradually increased, with production time gradually approaching the isotropic situation.