马塞勒斯页岩气藏单井产量递减规律及可采储量预测

Production Decline Rule and Recoverable Reserves Prediction of Marcellus Shale Gas Well in A Production Unit, Pennsylvania, US

随着水平井和水力压裂技术的发展,近年来美国宾夕法尼亚州页岩气区的钻井效率和新井产能得到了提升,新井数量开始减少,但页岩气产量仍不断提高。根据美国宾夕法尼亚州某页岩气生产单元的实际生产数据,用产量递减法进行了研究,判断了递减曲线类型,确定了初始产量、初始递减率等模型参数,对其未来产量、技术可采储量、剩余可采储量进行了预测。结果表明,该单元页岩气井符合双曲递减类型,并具有初期产量高递减快、后期产量低生产时间长的特点,该生产单元的4口井技术可采储量为0.90×10^8~1.55×10^8m^3,与国内外权威机构、学者对该区块的描述基本一致。

U.S. is the first country of large-scale and commercial development of shale gas in the world for its abundant shale gas resourc- es. Since the production decline regularity of shale gas well is obvious, it is of great academic value and practical value to study it. Based on the actual production data from a shale gas production unit in Pennsylvania, the method of decline curve analysis was adopted, the type of decline curve was determined, and the single well production and recoverable reserves were predicted. The results show that the shale gas wells of this unit are in line with the hyperbolic decline type, and the single well technical recoverable reserves could be higher.