非均质油藏性的压裂水平井产能预测

Production Prediction of Heterogeneous Reservoir Fracturing Horizontal Well

应用当量井径模型、等值渗流阻力法,考虑基质启动压力梯度非均质性及裂缝间的相互干扰,建立了稳态产能预测新模型;对影响非均质油藏压裂水平井产量的因素进行了分析。经与经典模型进行对比,验证了此稳态产能预测模型的准确性。计算结果表明,储层渗透非均质对产量有重要影响。相对于压裂水平井中间渗透带渗透率大小,两边渗透带渗透率大小对产能影响更大;启动压力梯度越大,对产能影响越大;与中间裂缝产量相比,两边裂缝产量对水平井总产能贡献值更大。

A new model of steady-state productivity prediction is established by using equivalent well caliber model,equivalent flow resistance method,considering the heterogeneity of matrix pressure gradient and the mutual interference between fractures. The factors influencing heterogeneous reservoir fracturing horizontal well are analyzed,and through comparison with the traditional model,the accuracy and applicability of this prediction model are verified. The results show that the heterogeneity of reservoir permeability has important influence on the yield. Compared with the middle crack production,the permeability of the two sides has a greater influence on the productivity than that of the middle permeable zone of the fractured horizontal well. The larger the starting pressure gradient is,the greater the effect on the production capacity is. Compared with the middle crack yield,the yield of the two sides can contribute greatly to the total output of horizontal wells.