稳态法水平井产能模型评价与对比

Evaluation and Comparison of Steady State Horizontal Well Productivity Models

针对不同稳态法水平井产能计算模型的假设条件、推导方法各有不同,导致其产能计算结果存在较大差异的问题,选择合适的模型应用于不同影响因素下水平井产能的计算,在综述国内外多种水平井产能模型的基础上,通过算例计算,评价各模型对产能预测结果的精确程度,并对其计算结果的差异性进行分析,讨论了水平井两端边界对产能预测的影响;引入水平井无因次拟表皮系数的概念,分析各不同影响因素下各类模型对产能预测结果的敏感程度。结果表明,Joshi模型、Renard-Dupuy模型、郎兆新模型、陈元千模型对渗透率非均质性小于1时的情况其产能计算结果有较好的一致性,Renard-Dupuy模型对渗透率非均质性大于1的情况适用性较差;徐景达模型和窦宏恩模型弱化了水平井两端供给区域的影响,因此其对长水平井的情况较为适用。

The assumptions and derivation methods of steady state horizontal well productivity calculation models are different,which leads to the large difference in the calculation results. To facilitate the selection of suitable models for researchers applied in different production influencing factors,this paper summarizes various production models home and abroad,evaluates the accuracy of each model by giving numerical examples,and analyzes the reason which causes the difference of the results. The results show that Joshi model,Renard-Dupuy model,Lang Zhaoxin model and Chen Yuanqian model are better used in the case,and the heterogeneity permeability is less than 1. Renard-Dupuy model is not suitable for the case,and the heterogeneity permeability is more than 1; Xu Jingda model and Dou Hongen model weaken the influence of the supply area at both ends of the horizontal well,so it is more suitable for the long horizontal wells.