低渗透油藏水平井流入动态分析及举升方式优选

流入动态及举升方式是低渗透油藏水平井开发的关键。基于Giger水平井产能公式，采用水电相似原理和保角变换法，推导了低渗透油藏非达西渗流条件下水平井产能预测模型及流入动态方程。现场实例验证结果表明，所建模型计算所得产液量与实际平均产液量的相对误差为2%。低渗透油藏水平井产能影响因素敏感性分析结果表明：水平井流入动态变化规律基本不受启动压力梯度影响；保持地层压力是提高低渗透油藏水平井开发效率的关键，启动压力梯度、渗透率和流体粘度变化系数与产液量成反比，且压力越低影响越明显；当水平井段长度小于400 m时，极限产液量随水平井段长度的增加呈线性增加，当水平井段长度大于400 m时，增幅变缓并最终趋于稳定；结合等级加权法与层次分析法，优选滨348块平1井的最佳举升方式为电潜泵举升。

Inflow performance analysis and optimization of artificial lifting for horizontal wells in low permeability reservoir

Inflow performance and optimization of artificial lifting way for horizontal wells in low permeability reservoir is the key to develop the horizontal wells for low permeability reservoir. Based on the classic Giger capacity formula, and adopting the hydropower similar principle and conformal mapping method to derive the productivity model and inflow performance equation of the hypotonic non-Darcy horizontal wells, the model has a higher accuracy after the field application verification, and the capacity influencing factors sensitivity of horizontal wells in low permeability reservoir is then analyzed. The analysis indicates that the horizontal well inflow performance variation is basically not affected by starting pressure gradient; and keeping pressure is the key to improve the efficiency of low permeability horizontal wells, the starting pressure gradient, permeability and coefficient of variation of the viscosity of the fluid are inversely proportional to liquid production, and the lower the pressure, the more obvious the effect; for the horizontal section length within 400 m, the ultimate production increases linearly with the horizontal length, the production drops and finally stabilized beyond 400 m;we use the equivalent weighting method and analytic hierarchy process to establish the lifting way preferred model, and the best lifting way of field wells is the electric submersible pump lifting.