Summary Well interference directly impacts well spacing optimization and well economics, thus it has received significant attention. Observed in many unconventional reservoirs, well interference is mainly attributed to connection of hydraulic fractures. Few studies have compared the hydraulic fracture connection during stimulation with that during the production period. This study connects these two aspects by leveraging the low-frequency distributed acoustic sensing (LF-DAS) signals acquired during the stimulation and the daily production data of 23 horizontal wells in the Denver-Julesburg (DJ) Basin. Strong cross-formation communication between Niobrara and Codell has been identified from both LF-DAS and production data. Interwell fracture connection could divert up to 80% of a shut-in well’s production to the offset well in the adjacent formation, revealing that well interference can be evaluated through random shut-ins of wells during production. Further, fracture connection in LF-DAS data is observed between Codell wells but rarely between Niobrara wells. Given the average Codell well spacing of 1,270 ft and Niobrara well spacing of 650 ft, we observe that the half-length of the stimulated hydraulic fractures in Codell wells is significantly longer than that of Niobrara wells. This study also confirms that stronger well interference during production correlates with strong fracture connection identified from LF-DAS.

中文翻译：

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在非常规油藏中使用生产和低频分布式声学传感数据进行井干扰和裂缝几何调查

总结 井干扰直接影响井距优化和井经济性，受到了广泛关注。在许多非常规油藏中观察到，井干扰主要是由于水力裂缝的连接。很少有研究将增产期的水力压裂连接与生产期的水力压裂连接进行比较。本研究通过利用增产期间获得的低频分布式声学传感 (LF-DAS) 信号和丹佛-朱尔斯堡 (DJ) 盆地 23 口水平井的日产量数据，将这两个方面联系起来。Niobrara 和 Codell 之间的强跨编队通信已从 LF-DAS 和生产数据中确定。井间裂缝连接可以将关闭井的产量的 80% 转移到相邻地层的邻井中，这表明井干扰可以通过生产期间的井的随机关闭来评估。此外，在 Codell 井之间观察到 LF-DAS 数据中的裂缝连接，但在 Niobrara 井之间很少观察到。鉴于 Codell 平均井距为 1,270 英尺，Niobrara 井距为 650 英尺，我们观察到 Codell 井中增产水力裂缝的半长明显长于 Niobrara 井。该研究还证实，生产过程中较强的井干扰与 LF-DAS 确定的强裂缝连接相关。LF-DAS 数据中的裂缝连接在 Codell 井之间观察到，但在 Niobrara 井之间很少观察到。鉴于 Codell 平均井距为 1,270 英尺，Niobrara 井距为 650 英尺，我们观察到 Codell 井中增产水力裂缝的半长明显长于 Niobrara 井。该研究还证实，生产过程中较强的井干扰与 LF-DAS 确定的强裂缝连接相关。LF-DAS 数据中的裂缝连接在 Codell 井之间观察到，但在 Niobrara 井之间很少观察到。鉴于 Codell 平均井距为 1,270 英尺，Niobrara 井距为 650 英尺，我们观察到 Codell 井中增产水力裂缝的半长明显长于 Niobrara 井。该研究还证实，生产过程中较强的井干扰与 LF-DAS 确定的强裂缝连接相关。