Abstract
Real-time low-frequency distributed acoustic sensing (LF-DAS) data was acquired using a cemented, permanent fiber optic cable for the first time during hydraulic fracturing of the offset horizontal well in Ordos tight oil reservoir. Based on high-quality LF-DAS data, cross-well communication (CWC) analysis was done stage by stage while completing the treatment well using plug-and-perforating (PnP). Clear frac-hit responses were observed during each stage's treatment, and most fractures hit the offset fiber well very early, which was far beyond the operator's knowledge and triggered a rethinking of the current completion and stimulation plan. Diagnostic tools like sealed wellbore pressure monitoring (SWPM) and microseismic mapping validated the frac hit events. Reactivation responses of the fractures created in early stages were easy to identify and aid in evaluating stage isolation effectiveness. After this case, further work could be considered from qualitative results to quantitative outputs.
