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中文摘要：
通过老井侧钻超短半径水平井挖潜砂体边部、注采不完善区域剩余油具有较好的优势，其目标井位主要针对低产井、停产井、套损井和报废井等。但侧钻后将无法恢复使用，因此，研究超短半径侧钻水平井选井选层技术界限十分必要。以断西试验区为例，通过数值模拟正交设计方案计算，采用多元回归法建立超短半径水平井10年累积产油量与有效厚度、无因次距顶高度、油水井距、平均渗透率、平均剩余油饱和度、水平井开采阶段完善程度的关系式，结果表明，回归公式精度较高，满足矿场计算需求，结合盈亏平衡分析，可确定超短半径水平井选层的主要因素技术界限，从而可优选超短半径水平井侧钻层位。
英文摘要：
The sidetracked horizontal well with ultra small radius has advantages for recover the remaining oil in sand edge or in- jection imbalance zones. The objective well sites are mainly on low production wells, shut-in wells, casing failure wells, and abandoned wells. But once the well is sidetracked, it could not be recovered. So it is necessary to study the threshold for layer and well selection of sidetracked horizontal wells with ultra small radius. Taking Duanxi pilot zone as an example, based on the numerical simulation or- thogonal experiment plan, multiple regression method is taken to set up the correlations between the 10 years＇ cumulative oil rate of the horizontal well with ultra small radius and the parameters such as effective thickness, dimensionless distance to the layer top, oil/water well spacing, average permeability, average residual oil saturation, penetrating completion degree of the horizontal well. Results show that the regression function accuracy is high, and satisfy the calculation need in field. Through the empirical correlation, together with breakeven analysis, the technology threshold for the main factors of layer selection is determined, therefore, the sidetracked layer of the horizontal well with ultra small radius can be optimized.
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